Cu含量对Al-Zn-Mg-Cu合金的组织性能和断裂行为的影响  

Effect of copper content on the properties and fracture behavior in Al-Zn-Mg-Cu alloys

作　　者：樊喜刚[1] 蒋大鸣[1] 单长智[2] 李念奎[2] 孙兆霞[2] 

机构地区：[1]哈尔滨工业大学材料学院,黑龙江哈尔滨150001 [2]东北轻合金有限责任公司,黑龙江哈尔滨150060

出　　处：《轻合金加工技术》2006年第2期31-35,共5页Light Alloy Fabrication Technology

摘　　要：介绍了Cu含量对Al-Zn-Mg-Cu合金组织性能和断裂行为的影响。利用光学显微镜、扫描电镜、X射线衍射等方法对合金的组织和断口进行了分析。结果表明,Cu含量对合金中粗大金属间化合物的类型和含量有较大的影响。含w(Cu)=2.3%的高Cu的Al-Zn-Mg-Cu合金中粗大金属间化合物较多,Al2CuMg较多。过时效状态下,高Cu的Al-Zn-Mg-Cu合金断口以粗大的Al2CuMg粒子开裂的韧窝为主;含w(Cu)=1.7%的低Cu合金断口以晶粒内小的穿晶韧窝为主。高Cu的Al-Zn-Mg-Cu合金中粗大的Al2CuMg粒子消耗了大量的Cu,降低了合金强化的潜力,在过时效状态下促进合金开裂。The effect of copper content on the microstructures and properties and fracture behavior of Al-Zn-Mg-Cu alloys was investigated. The microstructure and fracture surface were studied by optical microscopy and scanning electron microscopy. The results show that the copper content has a great influence on the type and volume fraction of the intermetallic phase. The alloy with higher copper content contains higher volume fraction of the intermetallic phase Al2CuMg. The failure mode of the two alloys is intragranular ductile fracture. In the alloy with higher copper content, the dimples are mainly initiated from the coarse Al2CuMg phase. The coarse Al2CuMg phase lowers the hardening capability and promotes the failure of the alloy with higher copper content.

关 键 词：AL-ZN-MG-CU合金 时效 性能 断裂行为 

分 类 号：TG113[金属学及工艺—物理冶金]