超塑预处理对7A04铝合金显微组织及力学性能的研究  

Investigation of Microstructure and Mechanical Properties of 7A04 Aluminum Alloy by Superplastic Pre-treatment

作　　者：郑青春[1] 刘志义[1] 宁爱林[1] 曾苏民[1] 

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083

出　　处：《矿冶工程》2005年第4期69-72,共4页Mining and Metallurgical Engineering

基　　金：重庆市院士基金资助项目(2000-6289);湖南省教育厅资助项目(03C444)

摘　　要：采用金相组织观察、力学性能测试、SEM断口形貌观察及TEM等手段,研究了传统处理工艺(CT)和超塑性预处理工艺(SPPT)对7A04铝合金显微组织和力学性能的影响。结果表明传统处理工艺的晶粒尺寸为30μm,超塑性预处理的晶粒尺寸为11μm。经超塑性预处理后合金在保持较高塑性的同时也有较高的强度,比传统处理工艺在强度上提高3.5%,塑性提高25.7%。The effects of conventional treatment （CT） and superplastic pre-treatment（SPPT） on the microstructure and mechanical properties of 7A04 aluminum alloy were investigated by means of optical microscope, mechanical tensile test, SEM and EDAX observations. The results show that the average grain size of the alloy treated by SPPT is 11μm, which is smaller than by CT. SPPT makes the ultimate tensile strength and the plasticity of the alloy increased by 3.5% and 25.7% respectively.

关 键 词：7A04铝合金 超塑预处理 显微组织 晶粒细化 力学性能 

分 类 号：TG166.3[金属学及工艺—热处理]