通过形变时效工艺同时提高Al-Mg-Si-Cu合金强度和电导率  

Simultaneously improvingstrength and electrical conductivity in Al-Mg-Si-Cu alloy by combined deformation and aging

作　　者：陈敬[1] 陈江华[1] 刘春辉[1] 赖玉香 顾媛[1] 

机构地区：[1]湖南大学材料科学与工程学院,长沙410082

出　　处：《功能材料》2016年第2期2139-2142,2147,共5页Journal of Functional Materials

基　　金：国家重点基础研究发展计划(973计划)资助项目(2009CB623704);国家自然科学基金资助项目(51171063);湖南省高校科技创新团队资助项目(2009-70)

摘　　要：铝是一种优良的导电材料,但由于强度低,其应用受到很大限制。随着铝在电力工业中应用逐渐增加,近年来,越来越多的工作致力于提高铝的导电率与强度的综合性能。通过改变传统T6时效工艺顺序发明一种同时显著提高Al-Mg-Si-Cu合金导电率和强度的形变时效工艺。本文采用显微硬度测量,导电率测试以及透射电镜(TEM)微观结构表征研究了形变时效工艺与传统T6时效工艺制备的材料在综合性能和微观组织上的差异。轧制变形引入的位错在后续时效过程调控析出,析出相形貌的改变是导电率相对T6工艺提高的原因,而残留位错可提高材料强度。Application of Al as an excellent conductor is restricted due to its low strength.With the increasing attention on Al in electric power industry,a variety of strategies have been proposed to obtain a better comprehensive property of electrical conductivity and strength.In this work,a combined deformation and ageing method,through which a simultaneous improvement in strength and electrical conductivity is achieved in Al-Mg-SiCu alloy,is developed by changing the sequence of traditional T6 temper.The differences in comprehensive property and microstructure between the T6 treated alloy and the one treated by our method are investigated by micro-hardness measurement,electrical conductivity test and transmission electron microscopy(TEM).The dislocations introduced by cold-rolling could tune the precipitation during subsequent ageing.The coarsened precipitates contribute to the enhancement in electrical conductivity while the retained dislocations increase the hardening potential of the alloys.

关 键 词：铝合金 导电率 强度 位错 析出相 

分 类 号：TG113[金属学及工艺—物理冶金] TM241[金属学及工艺—金属学]