时效温度对大冷变形2519A铝合金组织与性能的影响  

Effect of aging temperature on microstructure and mechanical properties of cold-heavy deformed 2519A aluminum alloy

作　　者：王会敏[1] 夏长清[1] 吴柳融[1] 周飞[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：《材料热处理学报》2011年第6期83-86,共4页Transactions of Materials and Heat Treatment

基　　金：国家重点基础研究发展规划资助项目(2005CB623706)

摘　　要：采用拉伸性能测试、显微硬度测试、扫描电镜和透射电镜观察等手段,研究了不同时效温度对50%冷变形2519A铝合金组织和力学性能的影响。结果表明:采用较大变形程度(50%)冷轧,再进行低温较长时间时效(140℃×6 h),可使2519A铝合金的强度得到显著提高(σb=551 MPa),同时其伸长率不低于7%;经冷变形的2519A铝合金,在稍高温度短时间(190℃×2 h)时效处理,将导致时效强化能力降低,但仍不低于常规时效处理(T6态:170℃×13 h)。Effect of aging temperature on microstructure and mechanical properties of cold-heavy deformed 2519A aluminum alloy with a reduction of 50% was investigated by means of micro-hardness test,tensile test,transmission electron microscopy（TEM） and scanning electron microscopy（SEM）.The results show that higher tensile strength of 511 MPa and elongation higher than 7% is obtained for the cold-heavy deformed 2519A alloy after aging at 140 ℃ for 6 h,and the age hardening of the cold deformed 2519A aluminum alloy is decreased by short-time aging at higher temperature（190 ℃×2 h）,which is still higher than that of conventional aging treatment（T6,170 ℃×13 h）for commercial 2519 aluminum alloy.

关 键 词：2519A铝合金 时效 力学性能 大冷变形 

分 类 号：TG146.2[一般工业技术—材料科学与工程]