The hybrid joint of titanium alloy (Ti-6Al-4V)/carbon fibers reinforced thermoplastic (CFRTP) has gained high interest from the industry due to lightweight. However, the bonding reliability of fabricated joints is relatively low due to the confined mechanical interlocking and weak interfacial chemical interactions, which limits its application for engineering. Herein, the novel functional poly glycidyl methacrylate-b-poly methacryloxy propyl trimethoxyl silane (PGMA-b-PMPTS) diblock copolymers were synthesized and introduced at the contact interface of Ti-6Al-4V/carbon fibers reinforced polyether-ether-ketone joints for enhancing the bonding reliability by directional induction of chemical interactions. Fourier-transform infrared spectroscopy (FT-IR) analysis and density functional theory (DFT) simulation calculation proved that both the Si-O-Ti covalent bonds and secondary interactions were successfully induced directionally at the bonding interface. The tensile-shear strength and bending strength were thus significantly improved by 341 % to 40.17 MPa and 152 % to 238.53 MPa compared with that of 9.09 MPa and 94.53 MPa in pretreated case. The bonding reliability improved gradually with the increase of molecular weight and molecular weight ratios between functional groups of PGMA-b-PMPTS diblock copolymers. The adhesion ratio of resin-carbon fibers mixture on failure surface increased to 89.6 % after the modification with synthesized PGMA-b-PMPTS diblock copolymers, which further verified the feasibility of promoting bonding strength of Ti-6Al-4V/CFRTP by inducing the high-density interfacial interactions directionally. Current work exhibits a simple yet attractive interfacial modification strategy to achieve high-reliability hybrid joints between metal and thermoplastics.

Hybrid structure of titanium alloy and carbon fiber reinforced thermoplastic composite (CFRTP) provided a new direction for lightweight and laser had a great prospect for application in joining metal/plastic. In this work, before laser joining TC4 (Ti6Al4V) and CFRTP (PA66), three groove micro-structures in different texturing di-rection (0 degrees, 45 degrees, 90 degrees) were prepared on the TC4 surface respectively by nanosecond laser. The effect of different groove texturing was studied. Research results showed that the existence of three groove texturing increased the affinity between TC4 and molten CFRTP to the same extent. The resin-carbon fiber mixture adhered to the surface of TC4 after laser texturing increased obviously. However, the groove micro-structure had different impact on the tensile performance of the joint. The maximum tensile shear strength could reach 10.9 MPa, which was increased by 111 % compared with the untreated when the groove micro-texturing direction was perpen-dicular to the tensile direction (0 degrees texturing) while the 90 degrees textured joint performance was only increased by 42.9 %. The FEA results revealed that micro-texturing provided mechanical resistance for the joint during the tensile process and 0 degrees micro-texturing provided the largest mechanical resistance followed by 45 degrees and 90 degrees micro-texturing.

The γ-aminopropyltrimethoxysilane (γ-APS) and γ-(2,3-epoxypropoxy) propyltrimethoxysilane (γ-GPS) single or bilayer silane film was produced to improve the tensile property of laser-welded 304 stainless steel/CFRTP joint in this work. The bonding mechanism at joint interface was investigated through experiments as well as density functional theory (DFT) calculation. Si-O-Fe covalent bonds were formed between steel and different silane films. Hydrogen bonds were induced at the interfaces of silane coating/polymer sides. The binding energy calculation results suggested that the binding between γ-APS silane coupling agent and steel was more stable than that of γ-GPS and steel. The binding energy of -3.37eV between amino group in γ-APS and carbonyl group in CFRTP was greater than the binding energy of -4.84eV between epoxy group in γ-GPS and amide group in CFRTP, which indicatedstronger interaction was obtained between γ-GPS and polymer compared to the interaction between γ-APS and polymer. The bilayer silane coating could combine the dominant functional groups of silane monolayer film to obtain stable bonding on both metal side and CFRTP side. Moreover, compared with silane single film, longer silane oligomer molecular chain length was provided by bilayer silane film, resulting in more entanglement sites between silane film and CFRTP and the increased joint mechanical property. The steel/CFRTP hybrid joint reached maximum tensile shear strength of 17.2MPa, which was further increased by 115.0% and 79.2% than that obtained by γ-APS and γ-GPS silane single coating, respectively.

Printing polymers on metal surfaces using fused deposition modeling could enhance the versatility of hybrid structures. However, the differences between metals and plastics prevented the effective spreading of molten plastic on metal surfaces, challenging reliable plastic printing on metal substrates. This study employed a nanosecond laser to fabricate laser-textured grids of varying widths (0.2-0.5 mm) on a 6061 aluminum alloy (6061Al) surface. Carbon fiber reinforced thermoplastic plastic (CFRTP) was printed on 6061Al surface in different printing directions (0 degrees, 45 degrees, and 90 degrees). The influence of laser texturing and printing direction on joint performance was evaluated. The findings indicated the laser-texturing increased 6061Al surface roughness, enhancing wettability of CFRTP on 6061Al surface. The 45 degrees degrees printing direction provided the best wetting, resulting in a tensile-shear force of 1631.7 N, 218% higher than at 90 degrees. Optimal performance was achieved with a 0.5-mm texture width, increasing tensile-shear force by 180% compared to 0.2 mm and 67% compared to 0.6 mm. Interfacial stress concentration decreased and then increased with the increase of laser- textured width and the 45 degrees printing direction provided the longest print path and best resin spreading. This research presented a novel approach to metal-polymer joining, with significant implications for advanced lightweight hybrid structures.

Objective Hybrid material structures have various applications in the automotive industry owing to their light weight. Stainless steel, which exhibits good corrosion resistance and remarkable mechanical properties, is widely used in automotive applications. Glass fiber reinforced plastics (GFRPs) that exhibit high specific strength and cost performance have replaced existing materials in applications requiring lightweight materials. Single-side resistance spot welding of stainless steel and GFRP can help combine the advantages of the two materials. However, owing to the difference in the thermal physical properties and chemical structures of these two materials, the combined strength cannot meet industrial requirements. Improving mechanical interlocking and chemical bonding is an effective approach for enhancing the joint performance. The laser joining process can be used to fabricate micro-textures and change the surface chemical state. Thus, micro-textures on the surface of stainless steel are prepared using a nanosecond laser, and the strengthening mechanism of the interface under the influence of the micro-textures is studied. Methods Initially, 304 stainless steel and GFRP are selected as base materials. The 304 stainless-steel sheets are subjected to laser texturing. The cruciform mesh micro-texture is selected as the basic morphology of the stainless-steel surface. The grid line uses contained multiple equally spaced scan lines, and a laser processing system supporting software is used to preset different micro-texture widths. The number of laser scanning times is set as 10, and the micro-texture width is set as 0.1?0.5 mm. An optical digital microscope and a field-emission scanning electron microscope are used to detect the laser texture, surface morphology, and fracture surface of the joint. A constant-temperature heating platform and a high-temperature wetting angle measurement system are used to measure the GFRP contact angle on the stainless-steel surface to characterize its wettability. A universal material testing machine is used to conduct tensile-shear tests on the 304 stainless steel/GFRP single-side resistance spot welding joints. Results and Discussions The introduction of micro-textures on the surface of stainless steel significantly improves the wettability of the surface. The surface of stainless steel changes from an untreated non-wetting state to a wet state after laser treatment. As the width of the micro-texture increases, the wettability initially increases and then decreases (Fig. 5). When the micro-texture width is 0.2 mm, the wettability reaches the optimum value. The interior of the micro-textures is completely filled with molten GFRP. When the micro-texture width is too large, the molten GFRP cannot completely fill the interior of the micro-textures (Fig. 7). C and Fe diffuse at the interface, and an element diffusion layer is formed (Figs. 8 and 9). When the micro-texture width is 0.2 mm, the tensile-shear force reaches the maximum value of 3548 N, which is 385% higher than that of the untreated stainless steel/GFRP single-side resistance spot welding joint. The tensile-shear force first increases and then decreases as the micro-texture width increases. Compared with the case of the joint without micro-textures, after laser treatment of the stainless-steel surface, a large amount of the resin-glass fiber mixture is observed in the center area of the fracture of the joint (Fig. 11). The fracture mode changes from an interfacial fracture to a mixed form of interfacial and cohesive fractures. Corresponding to the wettability and joint tensile-shear force, the bonded-area ratio first increases and then decreases, indicating an improvement in mechanical properties. Conclusions Laser texturing is used to improve the performance of stainless steel/GFRP single-sided resistance spot welding joints. After the nanosecond laser treatment, the wettability of the molten GFRP on the stainless-steel surface is significantly improved, and the state changes from non-wetting to wetting. The introduction of the micro-textures improves the mechanical properties of the stainless steel/GFRP resistance spot welding joint. When the micro-texture width is 0.2 mm, the tensile-shear force of the stainless steel/GFRP single-side resistance spot welding joint reaches the maximum value of 3548 N. Compared to the case wherein the micro-textures are not introduced, the tensile-shear force of the textured joint is 731 N. The introduction of the micro-textures increases the contact area between the stainless steel and GFRP, thereby significantly enhancing mechanical interlocking. When the micro-texture width is suitable, the GFRP completely fills the inside of the micro-textures. When the micro-texture width is too small or too large, the GFRP does not completely fill the inside of the micro-textures owing to the influence of wettability. In addition to mechanical interlocking, Fe and C chemically diffuse at the interface to form a compound layer, which further improves joint strength.

In this study, copper foil and poly-ether-ether-ketone (PEEK) film were directly bonded using nanosecond lasers. To strengthen the interfacial bonding between the copper foil and PEEK, ultraviolet/ozone (UV/ozone) and silane coupling treatment (APTMS) methods were proposed to modify the surface of the copper foil. The UV/ ozone treatment led to the oxidation of the surface of the copper foil to Cu2O. The bonding interface and fracture were characterized and analyzed via optical digital microscopy (OM), scanning electron microscopy (SEM), energy dispersive spectrometry (EDS), Fourier transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS). The Cu/PEEK joints demonstrated a 95 % improvement in peel strength following UV/ ozone + silane coupling treatments. Additionally, the red shift of the typical functional group wavenumbers demonstrated a strong hydrogen bond interaction between the copper foil treated with UV/ozone + silane coupling and the PEEK film. The mechanism behind the superior peel strength of UV/ozone + ATPMS-Cu/PEEK joints was subsequently validated through the density functional theory (DFT) analysis. Moreover, DFT was utilized to calculate the differential charge transfer and binding energies of Cu/silanol and Cu2O/silanol. As per the results, the bonding of Cu2O to silanol was more stable than that of Cu to silanol.

The application of metal-polymer structures has been restricted by challenges in achieving effective bonding between the two materials. To address this, nano-TiO2 coatings were introduced to improve the interfacial bonding between the treated 6061 Al alloy and carbon fiber-reinforced thermoplastic composite (CFRTP) during the laser joining process. The results highlighted that the joints created with nano-TiO2 coatings achieved significantly higher tensile shear force and strength, reaching 1.43 and 1.37 times the values of those without particles, respectively. This improvement can be attributed to the following factors: firstly, the incorporation of coatings led to an increase in the absorption of hydroxy groups, thereby improving the wettability of the Al alloy, which in turn promoted the formation of hydrogen bonds at the interface. Secondly, the increased surface roughness favored the chemical interaction between the Al alloy and CFRTP, ascribed to the enlarged contact area. Moreover, this change influenced the thermal contact conductance (TCC), thereby changing the temperature at the interface and joining areas of the two materials. Finally, a notable transformation in the failure mode was observed, transitioning from adhesive failure to cohesive failure when compared to joints without nano-TiO2 coatings. This underscored the reinforcing role played by nano-TiO2 particles, providing an innovative solution for enhancing the interface bonding between dissimilar materials.

Metal-polymer hybrid joints can contribute to weight reduction and have potential use in transportation industries. In this work, laser texturing was used to enhance bonding strength of laser-welded 304 stainless steel/carbon fiber reinforced thermoplastics (CFRTP) joint. The tight relationship between surface texture spacing and porosity characteristic as well as tensile property of joint was systematically investigated. The temperature field distribution during welding process was simulated and the mechanism of porosity suppression depending on grid spacing was discussed. The result showed that the number of pores at cross-section decreased first and then rose with the increase of micro-structure spacing, which corresponded to the variation trend of bonding strength and was inconsistent with the evolution of connecting area. The joint achieved the minimum porosity defect and reached maximum fracture load of 2594 N when the grid spacing was 1.2 mm, while the maximum joint width of 9.28 mm was obtained when 0.4 mm spacing was adopted, indicating that the joint quality rather than mechanical interlocking governed the mechanical property of joint. Appropriate interface contact conductance (TCC) related to texture spacing could optimize the interface heat dissipation rate, and was the key factor to efficiently control the shrinkage porosity. The TCC of small or large grid spacing was too high or too small, resulting in failure of the heat transfer path through the interface to metal during cooling process. Moreover, the proper texture spacing improved the uniformity of joint strain distribution in tensile-shear testing, which benefited joint strength.

For lightweight applications, the interfacial bonding reliability determines the service life of Ti-6Al-4V titanium alloy (TC4)/carbon fiber reinforced thermoplastic (CFRTP) joints. Traditional joining methods limit their applications. In this study, a functional Schiff base -contained polymer was successfully synthesized to modify the TC4 surface. The results indicated the directionally induced high -density complexation between the synthesized Schiff base and the titanium atom from the TC4 sheet and the secondary interaction between the synthesized Schiff base -contained polymer and CFRTP matrix occurred, which improved the bonding reliability of the TC4/ CFRTP joint. The combination of the high -density secondary interaction and synergistic effect between the functional groups enhanced the interfacial bonding strength by 287 % to 38.73 MPa. This was remarkably higher than the bonding strength improved by 46 % to 14.64 MPa via the introduction of micromolecule Schiff base that consists of same functional groups. The significant enhancement of the interfacial bonding reliability was thus achieved. These results were beneficial to future research to improve the reliability of metal-CFRTP hybrid joints.

In this study, a strategy towards thermoplastic-metal hybrid joint via bidirectional modification for high reliability was designed. The chemical bond behavior and conditions at the interface were explored from atomic scale using density functional theory (DFT) calculation. Based on the bonding mechanism, the AZ31B alloy was oxidized and the carboxyl groups (COOH) were introduced in the resin chain to improve the strength of chemical bond. The mechanical property of the designed joint was significantly improved and the tensile-shear strength achieved 22.7 MPa after bidirectional modification, reaching 4.5 times that of untreated joints. It was mainly attributed to the generation of metal-carboxylate bridging complex—a typical strong coordination bond formed between two O atoms in COOH and two diagonal magnesium atoms in MgO. Experimental evidence also suggested the generation of new chemical bond at the CFRTP/AZ31B interface. Finally, the bidirectional modification was proved to be an efficient and reliable method with high industrial adaptability. The current work opened up a novel direction for reliability promotion of thermoplastic-metal hybrid structures.

This study discussed the interfacial heat conduction in depth during the laser welding of metal to composite by constructing rough morphologies adopting the laser ablation method. Results revealed the interface temperature was significantly elevated, reaching 375°C under a line spacing of 0.4mm, which was higher 45°C than without treatment. For one thing, the increased surface roughness reduced the heat loss and caused the heat concentration at the interface. For another thing, the expanded contact area improved the wettability and strengthened the physical adsorption, and the highest work of adhesion was increased to 49mJ/mm2, reaching 1.3 times of those without treatment. The thermal contact resistance was thus decreased, which was confirmed by finite element analysis. Finally, the maximum tensile-shear force and strength of joints were 4171N and 23MPa, which was 3.7 times and 3.9 times of those joints without treatment. Additionally, the fatigue life and anti-salty corrosion of joints were improved, providing an effective method for further application.

Weight reduction in the various application fields has propelled to the forefront in investigations of combining metal with polymer. Different from other studies, this work focused on exploring the effect of carbon fibers on the thermal joining of metal to composite. Three plastics with different fiber contents including pure polyether-ether-ketone (PEEK), short carbon fibers reinforced PEEK (SCF/PEEK), and continuous reinforced PEEK (CF/PEEK) were chosen to join to the 6061aluminum alloy using a fiber laser. Results showed the thermal transfer was fostered along the carbon fiber orientation due to a higher thermal conductivity, decreasing the heat accumulation at the interface. However, the existence of carbon fibers also hindered the spreading of plastics on the aluminum alloy surface. This led to a smaller adhesion width and lower tensile-shear force of joints. In addition, the tensile-shear strength of joints prepared with carbon fibers was enhanced owing to lower thermal expansion coefficient, which improved the thermal shrinkage and reduced the stress concentration at the interface. Ultimately, the role of carbon fibers during laser joining of aluminum alloy to plastics was explained, clarifying the bonding mechanism of two materials.

To achieve laser direct welding of glass and metal without optical contact is hard, owing to the large difference in thermal expansion and thermal conductivity between glass and metal and an insignificant melting area. In this study, the high-power picosecond pulsed laser was selected to successfully weld the aluminosilicate glass/6061 aluminum alloy with a gap of 35 ± 5 μm between glass and metal. The results show that the molten glass and metal diffuse and mix at the interface. No defects such as microcracks or holes are observed in the diffusion mixing zone. Due to the relatively large gap, the glass collapsed after melting and caulking, resulting in an approximately arc-shaped microcrack between modified glass and unmodified glass or weakly modified glass. The shape of the glass modification zone and thermal accumulation are influenced by the single-pulse energy and linear energy density of the picosecond laser during welding, resulting in variations in the number and size of defects and the shape of the glass modification zone. By reasonably tuning the two factors, the shear strength of the joint reaches 15.98 MPa. The diffusion and mixing at the interface and the mechanical interlocking effect of the glass modification zone are the main reasons for achieving a high shear strength of the joint. This study will provide reference and new ideas for the laser transmission welding of glass and metal in the non-optical contact conditions.

Joining carbon fiber reinforced thermoplastic composites (CFRTP) with metals is a significant challenge for lightweighting in the automotive sector. The lower strength of hybrid joints limits their applications in the relevant fields. In this study, three distinct surface textures were applied to 6061 aluminum alloy (6061Al), including a traditional groove texture and two novel bionic textures (shark skin and fish scale), to enhance the strength of the hybrid joint between the materials. The impact of these textures on the mechanical properties of 6061Al/CFRTP hybrid joints was investigated through experimental methods and finite element simulations. The results indicated that the stress distribution at the interface of the bionic textured samples was more uniform, reducing stress concentration at the interface. Furthermore, the hybrid joint strength was improved as the bionic texture hindered crack initiation and propagation and facilitated crack deflection. Compared to the untextured samples, the fish scale textured samples exhibited the highest strength, which increased by 431.3 % relative to the untextured samples.

As an important way of lightweight, the hybrid structure of metal and plastic has a good application prospect in the automotive field. However, traditional resistance spot welding (RSW) which was used in transportation fields could not join metal and plastic. Here, this challenge was addressed by designing the single-side resistance spot welding equipment with flexible element. The joint between 304 stainless steel (SUS304) and glass fiber reinforced plastics (GFRP) was realized. The results indicated that the flexible element ensured the stability of joining process. Mechanical interlocking and element diffusion generated at the interface. The instantaneous heat input increased with the increase of welding current, the heat accumulation increased with the increase of the welding time and the contact resistance increased with the decrease of the welding pressure, which caused increase of resistance heat. The tensile-shear force increased firstly and then decreased as the resistance heat increased. The optimum tensile-shear force was 732N and the maximum ratio of resin and glass fiber mixture was 54.4% in case of 3000-A welding current, 1.0-s welding time, and 0.3-MPa welding pressure. Fracture consisted of three parts: the decomposed molten zone (DMZ), the effective molten zone (EMZ), and squeezed bonding zone (SBZ). The area of EMZ region in which fracture mode was cohesive failure mode determined the joint strength.

Cu/Ti dissimilar metal welding components have significant potential applications in aerospace, nuclear industries, and other fields. To achieve a robust connection between titanium (TA2) and copper (T2), this study conducted laser-welding experiments using nickel as an intermediate layer. The influence of a nickel intermediate layer on the joint formation, microstructure, mechanical properties, melting, and element diffusion behavior were investigated. The results revealed that without the addition of a nickel intermediate layer, when the laser beam was biased toward the titanium side during welding, a 17 μm thick layer of intermetallic compounds formed in the copper-side weld region. In this area, a notable concentration of fragile Ti–Cu intermetallic compounds forms, rendering it the weakest point in the joint. As a consequence, the ultimate tensile strength of the joint measures at 131 MPa, which is roughly 55 % of the tensile strength of the copper base material. The introduction of a nickel intermediate layer led to a change in the microstructure of the fusion zone, with Cu–Ti intermetallic compounds dispersed within, preventing the formation of brittle Ti–Cu phases at the copper interface. The addition of the nickel interlayer increased the tensile strength of the TA2-T2 joint to 224 MPa, which is approximately 94 % that of the copper parent material, and the joint exhibited ductile fracture behavior in the copper parent material's heat-affected zone.

The huge thermal difference between the aluminum alloy and polymer led to a low interface bonding strength, hindering the application of hybrid joints in the industries. Micro-sized aluminum (Al) particles were introduced into the polyamide 66 (PA66) resin substrates to improve the laser thermal joining of aluminum alloy to PA66 considering the heat conduction of metal particles. Results indicated the resin was physically reinforced after adding Al particles, enhancing the melting point and decomposition temperature due to the constraint on the polymer chain movement. The surface energy of PA66 resin was also increased because of the increase of polar functional groups, resulting in an enhancement of adhesion force between the aluminum alloy and resin. Furthermore, 3D thermally-conductive network formed between particles and resin substrates owing to the thermal vibration caused by Al electrons during the heat conduction, thereby strengthening the thermal conductivity of resin. This improved the thermal microscopic conductance at the interface, and the joining area at the interface dependent on the molten resin was thus enlarged. Finally, the tensile-shear force and strength of joints after adding Al particles were both significantly improved, reaching 1.35 times and 1.44 times of those without Al particles under the optimal heat input, respectively. This was achieved by a synergetic strengthening effect of enhanced adhesion force and joining area, providing a new method to obtain the high-quality joints.

Laser texturing and MAO (micro-arc oxidation) hybrid process was adopted to enhance the tensile-shear strength of laser welded CFRTP/TC4 joint. Introduction of porous MAO coating enhanced wetting ability of molten peek from CFRTP and increased surface roughness. Porous structure could also provide a mechanical interlocking effect in CFRTP/TC4 interface and improve the resistance to tensile-shear load. Highest tensile-shear force of 1587 N was obtained when 2.3 mu m MAO coating was prepared. Based on this, influence of various laser texturing patterns with different MAO coating thickness on the tensile-shear forces was clarified by combination of experiment and reasonable SVR (Support Vector Regression) model. Maximum predicated surface roughness of 3.075 mm was produced at texturing width of 0.327 mm, texturing depth of 100.54 mu m and MAO duration of 1.667 min. Furthermore, highest predicated tensile-shear force of 2995.1 N was achieved at texturing width of 0.331 mm, texturing of depth of 100.6 mu m and MAO duration time of 1.718 min.

The application of metal-plastic hybrid structures is of great significance for structural lightweight. The metal surface treatment is critical for metal-plastic joints. In this study, nanosecond laser was used to construct different microscale grooves on 6061 aluminum alloy (6061Al) surface to realize stable joints with glass fiber reinforced thermoplastic composites (GFRTP) by hot-pressing joining. The impacts of nanosecond laser processing on interfacial bonding of 6061Al/GFRTP were studied using analytical methods and finite element simulations. The results showed that the mechanical interlocking effectively improved the strength of connections. Moreover, the laser texturing patterns had different effects on promoting the wettability of metal surface and improving the heat conduction path. During the hot-pressing joining process, the poor wettability of molten GFRTP on untextured metal surface and different solidification rates at various molten positions led to the formation of shrinkage, which reduced the bonding area and induced stress concentration. When the pitch distance of textured grooves was 0.3 mm, the porosity was reduced to 1.15 %, and the corresponding maximum bonding strength was 9.78 MPa.

The oxide film could realize the formation of the chemical bonding between metal and plastic. In this study, surface pre-oxidation of AZ31B magnesium alloy was performed by two common methods to investigate the effect of oxide film on laser assisted joining of carbon fiber reinforced thermoplastic composites (CFRTP) and AZ31B. Oxide layer with porous structure was fabricated by micro-arc oxidation (MAO), in contrast to the dense and smooth oxide film produced by annealing. Both types of oxide film could effectively enhance the mechanical properties of the joint. Oxide layer could inhibit the decomposition of CFRTP and eliminate defects and relieve the residual stress because of the lower interfacial heat conduction. Porous structure of MAO coating further reduced the heat conduction. A new chemical bonding MgCO3 was identified at the joint with oxide. MAO coating could facilitate the formation of the new chemical bonding and enhance the mechanical interlocking, further strengthening the mechanical properties of the joint. The tensile-shear strengths of annealed and MAO joints were 8.8 MPa and 13.3 MPa respectively, reaching 1.60 and 2.41 times that of untreated joints (5.5 MPa). The MAO coating realized the comprehensive enhancement of AZ31B/CFRTP interface in terms of the interfacial heat transfer, mechanical interlocking and chemical bonding.