热处理对含Ag耐热铝合金组织与性能影响  

Effect of heat treatment on microstructure and properties of a heat-resistant Al-Cu-Mg-Mn-Ag alloy

作　　者：肖代红[1] 宋旼[1] 陈康华[1] 黄伯云[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,湖南长沙410083

出　　处：《材料热处理学报》2008年第1期75-79,共5页Transactions of Materials and Heat Treatment

基　　金：国家"973"重点基础研究发展规划(G2005CB623704);中国博士后科学基金(20070410986)

摘　　要：通过铸锭冶金及形变热处理,制备了一种含0.6Ag的Al-5.3Cu-0.8Mg-0.6Mn耐热铝合金。采用光学显微镜、扫描电子显微镜、差热分析及力学性能测试,研究了热处理工艺(包括均匀化处理、固溶及人工时效处理)对合金的组织与性能影响,并推导了其均匀化动力学过程。结果表明,理想的热处理工艺是均匀化制度为500℃×12h,固溶温度为525℃,人工时效制度为185℃×8h。通过优化热处理工艺,合金的室温抗拉强度达570MPa,伸长率在10%以上。A heat-resiStant Al-5.3Cu-0.8Mg-0.5Mn-0.6Ag alloy was prepared by ingot metallurgy and thermomechanical treatment. The microstructure and properties of the alloy under different heat treatment was studied with optical microscope, scanning electroh microscopy, differential thermal analysis and mechanical properties testing. Meanwhile, the diffusion kinetics of the alloy elements during homogenizing treatment was studied. As a result, the optimum heat treatment technology of the alloy is as follows： homogenizing at 500℃ for 12 hours, solution at 525℃, then aging at 185℃ for 8 hours. At this condition, the tensile strength and elongation of the alloy are 570 MPa and above 10%.

关 键 词：Al-Cu—Mg—Mn耐热铝合金 热处理工艺 显微组织 力学性能 

分 类 号：TG146.21[一般工业技术—材料科学与工程]