形变热处理对低浓度CuCr合金性能的影响  

Effect of thermomechanical treatments on properties of dilute CuCr alloys

作　　者：夏承东[1] 汪明朴[1,2] 徐根应[1] 贾延琳[1] 李周[1,2] 龚深[1] 虞红春[1] 

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083 [2]有色金属材料科学与工程教育部重点实验室,湖南长沙410083

出　　处：《功能材料》2011年第5期872-876,共5页Journal of Functional Materials

基　　金：国家高技术研究发展计划(863计划)资助项目(2006AA03Z517)

摘　　要：用两种形变热处理工艺制备了Cu-0.4Cr合金,并通过测定不同工艺合金的硬度和电导率,研究了形变热处理工艺对合金性能的影响,以得到硬度和电导率综合性能优异的且适宜工业化批量生产的工艺。结果表明,CuCr合金在线热轧淬火后经60%冷轧并在450℃时效30min后其硬度和电导率分别为156Hv,86.4%IACS,该工艺适合工业化批量生产;经固溶—冷轧80%—450℃时效30min后,合金硬度和电导率可达176Hv,80.2%IACS,虽然该工艺所制备合金性能优异,但难以实现工业化批量生产。对所得结果分析表明,所制备CuCr合金极易过时效,且冷轧变形量越大,时效温度越高,合金过时效越明显,生产中难以控制。微合金化以延缓时效是该合金值得研究的方向。Two different thermomechanical treatments（TMT） and their effects on the properties of Cu-0.4Cr alloys were investigated.The alloys were characterized using the measurement of Vickers and electrical conductivity to optimize the process which was suitable for commercial producing the alloys with best combination of strength and conductivity.The microhardness and electrical conductivity of the alloys after online hot rolling-quenching and cold rolling with 60% reduction and then aging 450℃ for 30min reached 156Hv,86.4%IACS,respectively,and the process was suitable for commercial production;Alloys which were prepared by solution treatment-cold rolling with 80% reduction-aging 450℃ for 30min obtained the excellent properties with microhardness and conductivity reached 176Hv,80.2%IACS,respectively,but it was unpractical to carry out on the production line.Analysis of the results indicated the prepared Cu-Cr alloys were sensitive to aging temperature and aging time,and easily inclined towards overaging,and the higher aging temperature and cold rolling reduction,the more distinctly overaging,so it was difficult to control the production.Micro-alloying maybe a worth study to suppress the softening of Cu-Cr alloy.

关 键 词：Cu-0.4Cr合金 形变热处理 在线热轧-淬火 性能 过时效 

分 类 号：TG113.2[金属学及工艺—物理冶金] TG146.1[金属学及工艺—金属学]