T8处理Al-Mg-Si-RE-B导体材料的显微组织及时效工艺试验研究  

Experimental study on microstructure and aging process of Al-Mg-Si-RE-B conductor materials under T8 process

作　　者：赵红亮[1] 谭瑞[1] 张瑞峰[1] 翁康荣[1] ZHAO Hong-liang;TAN Rui;ZHANG Rui-feng;WENG Kang-rong(School of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450001,China)

机构地区：[1]郑州大学材料科学与工程学院,河南郑州450001

出　　处：《轻合金加工技术》2018年第8期54-58,共5页Light Alloy Fabrication Technology

基　　金：河南省科技攻关计划项目(172102210010)

摘　　要：通过对比分析四种Al-Mg-Si-RE-B合金单丝在T8工艺下的强度和导电性,得出优化的合金成分,并采用SEM、EDS和涡流导电仪、拉伸试验机研究合金的显微组织及时效工艺对合金性能的影响。结果表明:T8工艺下得到优化的合金成分为Al-0.32Mg-0.42Si-0.2RE-0.08B,显微组织中存在较多的长条状α(Al-Fe-Si)相,且球状Al-Si-(La/Ce)相多在其附近富集,抑制了β(Al-Fe-Si)相形成。优化的合金单丝强度随时效时间的增加呈先上升而后下降的变化规律,随时效温度的升高,强度达到峰值的时间减少。导电率随时效时间的增加呈递增的变化趋势,最后趋于稳定。保温时间相同时,时效温度越高,导电率越高。时效同时提高了强度和导电率。The optimum alloy compositions were obtained by means of comparing and analyzing the strength and electrical conductivity of four kinds of Al-Mg-Si-RE-B alloy wires under T8 process. Microstructure and the effect of aging processes on the properties of the alloy were investigated by SEM,EDS,eddy current conductivity tester and tensile tester. The results show that the optimum alloy composition is Al-0. 32 Mg-0. 42 Si-0. 2 RE-0. 08 B under T8 process. There are many elongated α（Al-Fe-Si） phases in the microstructure of the alloy,and the spherical Al-Si-（La/Ce） phase is enriched in the vicinity,which inhibits the formation ofβ（Al-Fe-Si） phase. The tensile strength of the alloy wire increases first and then decreases with the extension of aging time. With the increase of aging temperature,the time at which the tensile strength reaches the peak is less. The conductivity of the alloy wire increases with the extension of aging time and finally tends to be stable. When the aging time is the same,the higher the temperature is,the higher the conductivity is. The aging process can improve both strength and conductivity.

关 键 词：导体材料 铝合金 组织 性能 稀土相 时效 

分 类 号：TG113.1[金属学及工艺—物理冶金] TG113.2[金属学及工艺—金属学]