Cd元素对Al-4Cu合金析出过程的影响  

Effects of Cd element on the deposition process of Al-4Cu alloy

作　　者：龚铸[1] 郑子樵[1] GONG Zhu;ZHENG Ziqiao(School of Materials Science and Engineering,Central South University,Changsha 410083,China)

机构地区：[1]中南大学材料科学与工程学院,长沙410083

出　　处：《粉末冶金材料科学与工程》2018年第2期157-163,共7页Materials Science and Engineering of Powder Metallurgy

基　　金：国家高技术研究发展计划资助项目(2013AA032401)

摘　　要：通过显微硬度、拉伸性能测试、透射电镜及高分辨检测等分析手段研究Cd在Al-4.0Cu合金中的微合金化作用。结果表明:100℃时效时,由于Cd元素的空位结合能较高,Cd元素的添加可抑制GP区的形成,减缓时效响应速率,使得含Cd合金的峰值硬度和强度降低;在150℃时效时,含Cd合金中析出的Cd′粒子为θ′相提供了非均匀形核位置,促进了θ′相的大量析出,使合金峰值抗拉强度大幅度提高。Cd′粒子与θ′相和铝基体的位向关系为(110)_(Cd)‖(001)_(Al)‖(001)_θ。The effects of trace addition of Cd elements on Al-Cu alloy were investigated by the micro-hardness test,tensile test and transmission electron observation(TEM).The results indicate that due to the strong interaction between Cd elements and vacancies,when the alloys are aged at 100℃,the additon of trace Cd inhibits the formation of GP zones,and it further decreases the aging reponse rate,the peak-aging hardness and tensile strength.When the alloys are aged at 150℃,the Cd-rich particles in Al-Cu-Cd alloy will act as heterogeneous nucleation position ofθ′phases and then promote the precipitation ofθ′phases is(110)Cd‖(001)Al‖(001)θ,which improves the tensile strength of the alloy.The orientation relationship of Cd particlesθ′phases and Al-matrix.

关 键 词：Cd元素 微合金化 析出强化相 HRTEM分析 AL-CU合金 

分 类 号：TG146.2[一般工业技术—材料科学与工程]