摘要
对挤压态6061铝合金分别进行了固溶处理和时效处理,采用万能试验机测试了其力学性能,通过SEM和TEM表征了合金的微观组织,研究了不同热处理条件下挤压态6061铝合金的组织演变规律。结果表明:固溶和时效处理后的挤压态6061铝合金均表现出明显的力学性能各向异性,且时效处理能有效提升合金的强度;同时,经时效处理后的挤压态6061铝合金表现出应变速率敏感性,而固溶处理的挤压态6061铝合金则无明显的应变速率敏感性;固溶处理和时效处理的挤压态6061铝合金的晶粒形态为等轴晶,但是有大小两种晶粒尺寸等级,大晶粒尺寸可达200μm,小晶粒尺寸则小于10μm。固溶和时效处理的挤压态6061铝合金均由较强的{001}<100>立方织构和较弱的{011}<100>高斯织构组成,且种类和强度相同;拉伸变形后的6061铝合金出现了大量的位错堆积,而经时效处理的合金中均匀分布短棒状的析出相能有效阻碍位错的运动,提高材料的变形抗力。
As-extruded 6061 aluminum alloy was subjected to solution treatment and aging treatment,respectively.The mechanical properties of the alloy were tested by universal testing machine,and the microstructure was characterized by means of SEM and TEM to investigate the microstructure evolution law of the alloy in different heat treatment states.The results show that the extruded 6061 aluminum alloy after solution treatment and aging treatment show obvious anisotropic mechanical properties,and aging treatment can effectively improve the strength of the alloy.At the same time,the extruded alloy after aging treatment shows strain rate sensitivity,however,the alloy after solution treatment has no obvious strain rate sensitivity.The extruded 6061 aluminum alloy after solution treatment and aging treatment are composed of equiaxed grains with two kinds of grain sizes,which the larger one being up to 200μm and the smaller one being less than10μm.The types and strength of texture components of the extruded 6061 aluminum alloy solution-treated or as-aged are the same,both are composed of strong{001}<100>cubic texture and weak{011}<100>Goss texture.After tensile deformation,a large number of dislocations pile up,and the short rod like precipitates will be evenly distributed in the alloy after aging treatment,which can effectively block the movement of dislocations and improve the deformation resistance of materials.
作者
刘伟
吴远志
邓彬
刘安民
刘巍
许子砚
叶拓
Liu Wei;Wu Yuanzhi;Deng Bin;Liu Anmin;Liu Wei;Xu Ziyan;Ye Tuo(Research Institute of Automobile Parts Technology,Hunan Institute of Technology,Hengyang Hunan 421002,China;School of Mechanical and Engineering,Hunan Institute of Technology,Hengyang Hunan 421002,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2020年第9期172-177,共6页
Heat Treatment of Metals
基金
国家级大学生创新创业训练计划平台项目(201811528002)
湖南省自然科学基金(2019JJ30009,2018JJ4031,2019JJ50110)。
关键词
挤压态6061铝合金
热处理
力学性能
微观组织
extruded 6061 aluminum alloy
heat treatment
mechanical properties
microstructure
