外加应力对Al-Cu-Mg-Ag合金时效析出行为的影响  

Effects of external stress on aging precipitation behavior of Al-Cu-Mg-Ag alloy

作　　者：曹素芳[1] 潘清林[1,2] 刘晓艳[1] 陆智伦[1] 何运斌[1] 李文斌[1] 

机构地区：[1]中南大学材料科学与工程学院,长沙410083 [2]中南大学有色金属材料科学与工程教育部重点实验室,长沙410083

出　　处：《中国有色金属学报》2010年第8期1513-1519,共7页The Chinese Journal of Nonferrous Metals

摘　　要：采用维氏硬度、光学显微镜、双臂电桥电阻及透射电子显微镜等手段,研究普通时效与应力时效时,外加应力对Al-Cu-Mg-Ag合金时效析出行为的影响。结果表明:外加应力会降低Al-Cu-Mg-Ag合金的时效硬化速率,减小峰值硬度和延长欠时效时间;外加应力能够促进Al-Cu-Mg-Ag合金中θ′相的析出,抑制Ω相的析出和长大;在外加应力的影响下,Ω相产生应力位向效应,且应力位向效应的产生主要在Ω相的形核阶段形成。Comparing the normal aging and stress aging,the effects of external stress on the aging precipitation behavior of Al-Cu-Mg-Ag alloy were studied by Wicker hardness test（HV）,optical microscopy（OM）,two-bridge electric-resistivity test and transmission electron microscopy（TEM）.The results show that the external stress during aging decreases the aging process of Al-Cu-Mg-Ag alloy and the hardness of peak aging,and prolongs the time of underaging stage.The external stress can enhance the precipitation of θ＇ phase and retard the precipitation and growth of Ω phase.With the effects of the external stress,the preferential oriented precipitation of Ω phase is observed,which mainly forms in the nucleation stage of Ω phase.

关 键 词：AL-CU-MG-AG合金 应力时效 应力位向效应 微观组织 

分 类 号：TG146[一般工业技术—材料科学与工程]