Effect of initial microstructure on hot workability of 7085 aluminum alloy

作     者：陈送义 陈康华 彭国胜 贾乐 Song-yi CHEN;Kang-hua CHEN;Guo-sheng PENG;Le JIA

作者机构：中南大学粉末冶金国家重点实验室长沙410083 

出 版 物：《Transactions of Nonferrous Metals Society of China》 (中国有色金属学报（英文版）)

年 卷 期：2013年第23卷第4期

页      面：956-963页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：Projects(2010CB731701,2012CB619502) supported by the National Basic Research Program of China Project(CX2012B043) supported by Hunan Provincial Innovation Foundation for Postgraduate,China Project(51021063) supported by Creative Research Group of National Natural Science Foundation of China 

主　　题：7085 aluminum alloy initial microstructure hot workability processing map strain rate sensitivity 

摘      要：The hot workability of 7085 aluminum alloys with different initial microstructures （as-homogenized and as-solution treated） was studied by isothermal compression tests at the deformation temperature ranging from 300 to 450 ℃ and the strain rate ranging from 0.0001 to 1 s 1. The strain rate sensitivity of the alloy was evaluated and used for establishing the power dissipation maps and instability maps on the basis of the flow stress data. The results show that the efficiency of power dissipation for the as-homogenized alloy is lower than that of the as-solution treated alloy. The deformation parameters of the dynamic recrystallization for the as-homogenized and as-solution treated alloy occur at 400 ℃, 0.01 s i and 450 ℃, 0.001 s-1, respectively. The flow instability region of the as-homogenized alloy is narrower than that of the as-solution treated alloy. These differences of the alloys with two different initial microstructures on the processing maps are mainly related to the dynamic precipitation characteristics.