The effects of casting temperature and cast-rolling speed on the microstructure and properties of the composite interface of 1070A/7075 aluminium alloy composite sheet were studied. The results showed that under the same process conditions, the diffusion distances of the Mg element and the Cu element were the greatest and smallest, while that of the Zn element was found between the diffusion distances of the two elements. Furthermore, the intermetallic compound Al23CuFe4 generated at the interface greatly affected the bonding and tensile properties of the composite sheet. When the casting temperature was 690 °C, the cast-rolling speed was 12 m/min. The shear strength, tensile strength, yield strength and elongation were determined as 86.2, 173.9 and 108.6 MPa and 24.9%, respectively.
在"双碳"的时代背景下,材料的轻量化和安全性受到越来越广泛的关注.铝合金具有密度小、比强度高和耐蚀性好等优点,广泛应用于交通运输和航空航天等领域.结构材料的损坏形式绝大多数是疲劳损坏,占整体的70％左右,因此铝合金的疲劳性能关乎着产品使用安全性.为此,本文介绍了疲劳性能的特点及分类,综述了铝合金疲劳性能的研究现状、影响因素及近年来研究的热门领域.
据土耳其2023年2月16日发表的总统令,埃蒂铝业公司(Eti Aluminum)将投资30亿里拉(1.6亿美元)建一个新的铝板带轧制厂,生产能力100 kt/a,还将获得政府的鼓励补贴,包括关税和增值税豁免、保险费支持和减税.在未来10 a内,政府也将满足新工厂约50％的能源消耗支出,前提是不超过2亿里拉.该公司的目标是在5 a内完成投资目标.埃蒂铝业公司目前销售铝锭、T形锭、圆锭、扁锭、热轧板带等,生产能力82 kt/a.
俄罗斯是全球第二大原铝生产国,俄罗斯联合铝业公司(URC)是其唯一的生产者,总生产能力4 000 kt/a,约占全球总产能的6％.俄铝的生产链包括铝土矿及霞石矿山、氧化铝精炼、铝冶炼及铸造、铝箔及包装材料,其核心铝厂都位于水电资源丰富的西伯利亚地亚地区,极具成本竞争力.2021年俄铝原铝产量3 764 kt,氧化铝产量3 764 kt.
The slag inclusion in the casting process of aluminum alloy ingot may lead to different kinds of defects on the plates and strips for different applications.The finished de-fects of aluminum plate and strip used for can body and CTP stock with large market con-sumption and high quality requirements were studied by means of SEM.And the correspond-ing relationship between the finished defects and the melting and casting slag was estab-lished.Then the root cause of slag inclusion was explored with the help of Prefil-Footprint slag measuring instrument.The measures such as strengthening furnace cleaning,optimizing filtration,and optimizing the addition of grain refiners were formulated according to local conditions.This can effectively reduce the possibility of slag inclusion defects in melting and casting and avoid their impact on the quality of finished plate and strip products.
Different alloy compositions,ingot homogenization annealing,surface turning and other production process parameters were tested and compared on 6063 aluminum alloy pipes for OPC photosensitive drums.The inspection and analysis were then conducted through scanning electron microscopy,metallographic microscopy,electronic universal tes-ting machine,surface roughness meter,etc.The influence of different process parameters on the quality of 6063 aluminum alloy pipes used for photosensitive drums was mastered,so as to find better production processes.The quality of 6063 aluminum alloy pipes for photosensi-tive drums produced using optimized processes meets market requirements.
The production process of 8021 aluminum alloy foil for battery pouch was stud-ied.Mechanical properties and microstructure of the battery pouch under different process systems were detected and analyzed.The results show that when the 8021 aluminum alloy is hot rolled from 5.0 mm thickness to 0.5 mm thickness for complete recrystallization annea-ling and rolled to 0.04 mm for finished product annealing,the tensile strength,elongation and cupping value are 97 MPa,22％,and 7.6％,respectively.The comprehensive per-formance meets the usage requirements of aluminum foil for battery pouch,reaching the quality level of imported aluminum foil.
Taking 2.0 mm-thick 7075 aluminum alloy friction stir welded sheets as the re-search object,the deformation behavior of friction stir welded joints during warm rolling was discussed.The microstructure and mechanical properties of welded joints with different roll-ing reductions before and after relling were tested by OM,EBSD,hardness test and tensile test.The results show that with the increase of rolling deformation,the microstructure of each area becomes more uniform.When the total rolling reduction is 75％,the characteris-tics of the welded joint disappear gradually,and the difference between the structure of the weld zone and the base material becomes smaller.In addition,due to the effect of dynamic recrystallization,the structure of the joints becomes more uniform,the difference in mechan-ical properties between the welded zone and the base material becomes smaller,and the hardness tends to be consistent.When the rolling reduction reaches 75％,the tensile strength of the 0.5 mm-thick welded joints is 269 MPa,and the elongation is 4.1％,which can meet the process requirements of subsequent rolling,and ensure that no strip breakage occurs during tension rolling.This study provides theoretical basis for rolling deformation in the welded zone.
The uniformity of temperature field during on-line quenching of large and com-plex profiles is of great significance to the quality control.In this paper,the extrusion profile of 6013 aluminum alloy with a hollow complex section for new energy vehicles is taken as an example.The cooling curves of 6013 aluminum alloy under three cooling methods of air cool-ing,spray cooling and water cooling are measured through experiments.The average heat transfer coefficient under the three conditions are calculated according to the inverse heat transfer method,i.e.0.000 05 W/(m2·℃),160 W/(m2·℃)and 5 kW/(m2·℃)respectively.The finite element numerical simulation shows that the temperature field is not uniform during the whole mist cooling of profiles.When cooling for 12 s,the highest temperature is 110 ℃,the lowest temperature is 47 ℃,and the maximum temperature difference reaches 63 ℃.Therefore,a zone-based cooling method is proposed to improve the uniformity of temperature field by adjusting the flow rate of mist cooling on profile wings,bottom plates and connections.After optimization,the maximum temperature difference of the profiles is reduced to 8.5 ℃ when cooling for 12 s.
Mg-5Li-2.6Al-1.8Zn alloy was cast in a vacuum induction melting furnace and extruded thereafter.The microstructure of the as-extruded alloy was detected by OM,SEM,XRD,and EDS.The mechanical properties of the as-extruded alloy were tested by tensile testing at room temperature.And the fracture morphology was observed.The results indicate that the as-extruded Mg-5Li-2.6Al-1.8Zn alloy is composed of α-Mg base and a slight a-mount of AlLi phase,with fined grain sizes.The as-extruded Mg-5Li-2.6Al-1.8Zn alloy has high mechanical properties,with tensile strength of 260 MPa and elongation of 20.7％.The fracture surface is mainly composed of dimples and the alloy has a good plasticity.
The grain size testing was conducted on the 12.5 mm thick 6R01T4 aluminum alloy used for the 12.5 mm-mobile phone backboard.When using common chemical etchants or anodized coating methods to prepare samples,the recrystallized grains did not show com-pletely,and there were missing points during testing,resulting in significant data errors.Through repeated experimental research,the article concludes that after etching with HF,HCL,H2O as 1∶1∶11(by volume)for 210 seconds,and then anodizing and coating,the prepared sample can fully display grains,ensuring the accuracy of grain size detection re-sults.
This article introduces the revision principles and main contents of the national standard GB/T 7998-2023"Evaluation Method for Susceptibility of Aluminum Alloy Intergranular Corrosion".It also conducts a comparative analysis of the standard level with relevant foreign technical requirements,evaluates the innovation points,and points out the promotion and application effects.
期刊简介:《轻合金加工技术》是铝、镁、钛等有色金属材料行业学术期刊,创刊于1964年,是国内较早宣传及报道铝、镁及其合金材料研发、工程化研究成果的专业期刊之一.《轻合金加工技术》曾荣获全国有色金属行业优秀期刊奖、中国首届《CAJ-CD规范》执行优秀奖、首届黑龙江省出版精品工程奖提名奖;自2012年以来被美国《化学文摘》收录;分别于1992、1996、2004、2008、2011、2014、2017年被北京大学收录《中文核心期刊要目总览》来源期刊;2020年被中国金属学会评价认定为"冶金工程技术与金属材料(金属学与金属工艺)"领域高质量科技期刊(T3级).
The four kinds of Al-6Mg-0.6Mn alloy ingot with different amounts of Sc and Zr were prepared by metallurgy.The effects of different amounts of Sc and Zr on the microstruc-ture of as-cast alloys were studied by means of metallographic microscope,SEM and EBSD.The results show that the as-cast dendritic net can be eliminated and the as-cast microstruc-ture can be refined obviously by adding w(Sc)=0.15％Sc and w(Zr)=0.10％Zr to the Al-6Mg-0.6Mn alloy.The coarse Al3(ScZr)particles in the melting and casting can not re-fine the grain size,but deteriorate the microstructure and adversely affect the mechanical properties,so it should be strictly controlled.
The increasing utilization of aluminum alloys across different industries has led to a corresponding rise in the demand for aluminum alloy welding wires.This article intro-duces the production processes and trends of aluminum alloy welding wires at home and abroad.It focuses on the three main production methods of aluminum alloy welding wire stocks,i.e.vertical direct-chill casting extrusion method,continuous casting rolling meth-od,and horizontally continuous casting drawing method.It then states the principles,advan-tages,disadvantages,and development status of each method.
Hydrogen embrittlement is a common problem in high-strength materials,which seriously deteriorates the properties of materials,causing unstable crack propagation and e-ven fracture inside the materials and leading to catastrophic damage.Based on the research of hydrogen embrittlement,the crack propagation and fracture mechanism caused by hydro-gen,such as hydrogen-induced weak bond theory and hydrogen-induced local plasticity theo-ry,are discussed in this paper.The test and characterization methods of hydrogen embrittle-ment and hydrogen embrittlement sensitivity are discussed as well.Hydrogen energy is used more and more widely.In order to avoid or reduce the problems caused by hydrogen embrit-tleage,the development and application of hydrogen compatible materials are also gradually promoted.
江西康维铝业科技有限公司位于江西省九江市柴桑区赤湖工业园,于2023年1月投产,总投资6亿元,占地面积120亩,生产再生铝锭及铝挤压材,生产能力300 kt/a,全部达产后,预计主营收入30亿元/a,上缴税收1.2亿元/a,解决用工200人.
随着铝合金带材的高质量发展,对其表面质量的要求也越来越高,起皮问题的解决愈发迫切.对铝合金热轧带材起皮缺陷形貌、分布规律等进行分析,探讨起皮缺陷产生的原因,制定相应对策.起皮主要与铸锭上下表面的接触设备、轧辊状态、铸锭质量关系密切,生产过程中要加以控制.
通过拉伸试验和夏比冲击试验等研究了 7B52铝合金板材强度和冲击性能的各向异性,并结合断口的OM和SEM分析,探讨了第二相和晶粒形态对7B52铝合金板材各向异性及断裂行为的影响.结果表明,7B52铝合金板材的强度和冲击性能存在着明显的各向异性,板材纵向的强度和冲击吸收能量均高于横向的;单轴拉伸加载时,第二相的大小和分布是影响裂纹形核扩展的主要因素;冲击加载时,再结晶晶粒在不同取向的形态是影响7B52铝合金板材断裂行为的主要因素.
优化船用铝合金带筋宽幅型材挤压模具结构,对不同模具设计方案进行讨论分析.利用有限元分析软件Hy-perMesh 进行数值模拟,获得挤压过程中模具位移及应力场的变化规律;结合工程实验,验证模具设计方案的可行性;调试相应挤压生产工艺,对挤压设备进行配套改造,得到最优模具结构.结果表明,采用无缝管挤压模具方案进行生产,可得到一体成型的尺寸较大、性能较好的带筋型材.
