摘要
采用加压成形工艺制备6063铝合金,然后对铝合金进行535℃固溶和时效处理,研究了固溶时间(15~120min)、时效温度(160~200℃)和时效时间(1~24h)对该铝合金显微组织、拉伸性能和硬度的影响。结果表明:随着固溶时间的延长,6063铝合金晶粒尺寸增大,Mg_(2)Si初生相逐渐消失并回溶至基体中,而固溶时间未对α-Al_(8)Fe_(2)Si相和β-Al_(5)FeSi相的含量与形貌产生影响;固溶处理后,随着时效温度的升高或时效时间的延长,第二相Mg_(2)Si数量增加,但过高的时效温度或过长的时效时间导致Mg_(2)Si相粗大;随着固溶时间、时效时间的延长,或时效温度的升高,合金的强度和硬度先升高后降低,断后伸长率先减小后增大;6063铝合金适宜的固溶和时效处理制度为535℃×60min+180℃×7h,此时合金中析出的Mg2Si相最细小,且弥散分布,合金具有最高的强度和硬度,以及合适的断后伸长率。
6063 aluminum alloy was prepared by pressure forming process,and then was treated by solution at 535℃ and aging.The effects of solution time(15-120 min),aging temperature(160-200℃)and aging time(1-24 h)on the microstructure,tensile properties and hardness of the aluminum alloy were studied.The results show that with increasing solution time,the grain size of 6063 aluminum alloy increased,and the primary Mg_(2)Si phase gradually disappeard and redissolved in the matrix;but the solution time had no effect on the content and morphology of α-Al_(8)Fe_(2)Si phase and β-Al_(5)FeSi phase.After solution treatment,with increasing aging temperature or aging time,the number of second phase Mg_(2)Si increased,but a higher temperature or a longer aging time resulted in the coarse of the Mg_(2)Si phase.With increasing solution time,aging time or aging temperature,the strength and hardness of the alloy increased first and then decreased,and the precentage elongation after fracture decreased first and then increased.The appropriate solution and aging treatment system for 6063 aluminum alloy was 535℃×60 min+180℃×7 h;at this time the Mg_(2)Si phase precipitated in the alloy was the smallest and dispersed,and the alloy had the highest strength and hardness and the appropriate precentage elongation after fracture.
作者
刘全升
范梦婷
罗欣然
LIU Quansheng;FAN Mengting;LUO Xinran(Department of Civil Engineering,Henan Vocational College of Water Conservancy and Environment,Zhengzhou 450008,China;Department of Engineering,Chongqing City Vocational College,Chongqing 402160,China;School of Materials Science and Engineering,Chongqing University,Chongqing 400044,China)
出处
《机械工程材料》
CAS
CSCD
北大核心
2021年第1期66-72,79,共8页
Materials For Mechanical Engineering
基金
中央高校基础研究基金资助项目(106112017CDJQJ328839)。
关键词
6063铝合金
固溶
时效
显微组织
力学性能
6063 aluminum alloy
solution
aging
microstructure
mechanical property
