Purpose: The paper presents the results of mechanical activation of the surface on oxide layer thickness after heat treatment of TU6Al14V ELI alloy. Design/methodology/approach: Specimens were made from 5 mm diameter rod cut into semicircular slices. The samples were mechanically activated throughout mechanical treatment of the surface: one sandblasted with glass beads during 5 minutes and other ground with sandpaper grit 40, 180, 220 and 800 during 7.5 and 15 minutes. Findings: Then microstructure of specimens etched with Kroll solution was observed using an optical microscope and roughness parameters of the surface were measured. Research limitations/implications: Afterwards heat treatment (550°C, 5 hours) was conducted, then roughness parameters and thickness of the oxide layer were measured by means of a scanning microscope. Practical implications: The conducted research showed up that mechanical activation of the surface which cause an increase of surface development results in greater thickness of the oxide layer which is formed during heat treatment. Nevertheless, mechanical activation that results in a decrease of surface development, such as polishing, results in a decrease of oxide layer thickness. Originality/value: The results of the research can be used to obtain the desired thickness of the oxide layer in the production of the elements that require increased wear and corrosion resistance.

In this paper the results of the structural and magnetic investigation of Fe61Co10Y8Zr1B20 alloy after solidification and isothermal annealing was presented. The isothermical annealing was carried out at 700 K for 1 h and 770 K for 3.5 h. For the structural investigation was performed by X-ray diffractometer equipped with a copper lamp. The results of (XRD) measurements showed the material in the state after the solidification and heat treatment is amorphous. Static hysteresis loops and initial magnetization curve was measured using vibrating magnetometer (VSM). The quality and quantity of structural defects in the sample after heat treatment was determined by indirect method using analyze the initial magnetization curve in accordance with the theory of Kronmüllera. These studies have shown that the annealing process has big influence to change significantly quantity of defects in amorphous structure as a result, there are changes of magnetic parameters such as saturation magnetization and field μ0Ms coercivity Hc.

The properties of metallic amorphous materials depend mainly on their chemical composition and the degree of relaxation of the structure. The relaxed amorphous structure is usually obtained by annealing below the crystallization temperature (T-x). However, this process can be forced during the production process. In this paper, the results are presented of investigations into the: microstructure, magnetic and mechanical properties of Fe61Co10Y8W1B20 alloy. The samples, fabricated in the forms of ribbons and plates, were produced using cooling speeds of 10(4)-10(6) K/s and 10(1)-10(3) K/s, respectively. In the course of the investigations, it has been found that varying the quenching speed of the liquid alloy has a major influence on the properties of the Fe61Co10Y8W1B20 amorphous alloys. (C) 2014 Elsevier B.V. All rights reserved.

In this paper the results of the structural and magnetic investigation of Fe61Co10Y8Zr1B20 alloy after solidification and isothermal annealing was presented. The isothermical annealing was carried out at 700 K for 1 h and 770 K for 3.5 h. For the structural investigation was performed by X-ray diffractometer equipped with a copper lamp. The results of (XRD) measurements showed the material in the state after the solidification and heat treatment is amorphous. Static hysteresis loops and initial magnetization curve was measured using vibrating magnetometer (VSM). The quality and quantity of structural defects in the sample after heat treatment was determined by indirect method using analyze the initial magnetization curve in accordance with the theory of Kronmullera. These studies have shown that the annealing process has big influence to change significantly quantity of defects in amorphous structure as a result, there are changes of magnetic parameters such as saturation magnetization and field mu M-0(s) coercivity H-c.

Purpose: The preparation of composite materials composed of Fe66Co10Ni2W2B20 alloy powders and epoxy resin and determining the influence of the alloy powders fraction Fe66Co10Ni2W2B20 on mechanical and magnetic properties of produced materials. Design/methodology/approach: Tested samples made of Fe66Co10Ni2W2B20 alloy powders and epoxy resin, were produced by pressing with pressure 5MPa during 10 s. In order to examine produced materials structural studies were conducted (observation under an optical microscope, a scanning electron microscope with EDS analysis), mechanical (measurement of surface roughness) and magnetic (obtaining static magnetic hysteresis loop based on measurements were made using a vibrating magnetometer (VSM)). Results: Pressing ofFe66Co10Ni2W2B20 alloy powders and epoxy resin allows to obtain composite materials, which are divided into three fractions, namely: 20-50 μm 50-100 μm 100-200 μm characterized, with the increasing size of the fraction of reinforcement, the better development of the area. Magnetic studies show that with increasing size of the fraction of the reinforcement, those materials have smaller coercive field, as well as the observed decrease in saturation magnetization. Originality/value: By combining Fe66Co10Ni2W2B20 alloy powders and epoxy resin composite materials with different fractions of reinforcement, which exhibit better properties than the starting materials used to receive are possible to obtain.

Purpose: The paper presents a comparison of the structure and properties of titanium alloys Ti-6Al-4V produced by two methods: conventional and injection casting which allows obtaining solid amorphous alloys. Design/methodology/approach: Test samples are titanium alloys Ti-6Al-4V produced by two methods: conventional and injection casting. To achieve assumed objective the followed test were performed: phase composition by X-ray diffraction, microstructure observation was carried out, preformed to study the geometry of the surface – roughness and abrasion resistance measurements. Research limitations/implications: Observation of microstructures revealed that, titanium alloy Ti-6Al-4V produced by conventional method has a crystalline ordered structure which is typical for materials produced by continuous casting, while the titanium alloy produced by injection casting has a structure partially crystalline, and in most predominates amorphous structure which is characterized by a lack of order and regularity. Confirmation of structural studies were obtained diffraction records from qualitative X-ray analysis. Sample which was produced by continuous casting has higher rate of roughness than sample produced by injection casting. Titanium alloy produced by injection casting has higher rate of abrasion resistance than alloy produced by conventional casting. Higher roughness and higher abrasion resistance, these properties are beneficial for the process of fusion of the implant with the tissues in living organism, that same is desired in case when alloy will be used for biomedical applications. Originality/value: The paper presented study of solid amorphous alloys which were produced by injection casting. That kind of production allowed to achieve much better properties than for alloys produced by conventional method continuous casting.

Purpose: In paper characterized two methods produced titanium alloy: hitherto used in industry – conti-casting and innovative method of obtaining solid amorphous alloy by injection casting. The results of studies comparing the structure and properties of the alloy Ti-6Al-4V produced by both methods. Design/methodology/approach: Test samples were titanium alloy Ti-6Al-4V produced by two methods: conventional and injection. To achieve the objective pursued performed the following tests: microstructure observation was carried out, the analysis of mechanical properties (microhardness) and corrosion resistance tests were performed in Ringer’s liquid, which simulates the human body fluids. Findings: Microstructural study allowed to observe that titanium alloy T-6Al-4V produced by conventional method has crystalline ordered structure which is characteristic for materials obtained by drawing, with oriented grains and elongated in the direction of drawing. Same alloy produced by injection casting has amorphous structure with occurrences of the single-crystal seeds, that kind of structure has lack of order and regularity. The microhardness study showed, that titanium alloy Ti-6Al-4V produced by drawing has a hardness of less than twice for the same alloy produced by the injection. The corrosion tests conducted in an environment that simulates human body fluids, revealed showed that the materials made by injection have significantly corrosion potential than alloy obtained by drawing. Originality/value: The paper presents a comparative study of titanium alloy produced by drawing and massive amorphous alloy produced by unconventional method – injection casting. By the results proved that the alloy produced by injection has much better properties than alloy produced by drawing.

The aim of this study was to manufacture amorphous Co22Y54Al24 alloy in a form of thin ribbons and to investigate their properties. The investigated ribbons were prepared by rapid solidification of molten metal on a rotating copper cylinder (melt-spinning). In order to obtain the material with amorphous structure, the cooling rate of the liquid alloy should vary in a range from 10(4) to 10(6) K/s. The microstructure studies were performed using X-ray diffractometery. The mechanical properties were investigated by metallographic studies, micro-hardness and tribological resistance tests moreover the surface roughness profile were analyzed. All studies were performed for two sides of tapes, since the differences in ribbons surface, related with manufacturing process, are clearly visible. The surface from the bottom (drum side) was glossy and from the top side it was shiny.

Purpose: In these paper was were characterized mechanical properties of titanium alloy Ti-6Al-4V, which were produced by two methods conventional casting and injection casting. Studies were presented by comparing of samples which were produced by these methods. Design/methodology/approach: Samples were produced by two methods – conventional and injection casting. To achieve the objective were performer the following steps: the microstructure was carried out, the analysis of mechanical properties was done (microhardness), study of surface roughness was made, research of abrasion was made and phase composition by X-ray diffraction was made. After then then a comparison of these studies between these samples was made. Findings: The study of the microstructure was observed that the titanium alloy Ti-6Al-4V prepared by the conventional method, it has equiaxed and globular structure. In contrast, titanium alloy produced by the injection has strips structure, where phase α’ is on phase β border. Further studies have shown that a sample of titanium alloy Ti-6Al-4V produced by injection it has a much greater tribological resistance because it has a higher microhardness and much greater roughness than the sample of the same alloy produced by the conventional method. Originality/value: In this article conducted a comparative characteristics for the two production methods conventional and injection titanium alloy Ti-6Al-4V. The research indicated that much better mechanical properties are characterized alloys produced by injection.

Purpose: The paper present determine the basic mechanical properties of amorphous alloy based on iron (Fe61Co10Zr5W2Y2B2), produced by injection. Design/methodology/approach: The study was carried out the following steps: at fist microhardness were performed with using microhardness tester Future Tech FM 7 by Vicker’s method with load 970.7 mN. Second step were performed abrasion tests on ball-tester with zirconium ball. These tests were performed in 3 steps – first (study was conducted in one hour), second (study was conducted in two hours), third (study was conducted in three hours). Third kind of study was roughness performed on profilometer Hommel T1000. The sample surface was examined in the section 4.8 mm. After high-resolution photos were then taken with a scanning electron microscope (JEOL JSM 6610 LV). In contrast images with areas threadbare, made using an optical microscope Axiovert 25. Findings: Tests results of samples in of the alloy (Fe61Co10Zr5W2Y2B2) in the form of plates were confirmed higher microhardness amorphous alloy than material with same chemical composition but with crystalline structure. Originality/value: Receipt of amorphous alloys with unique mechanical properties for electronics applications.