力作用方式对定向CuAl合金马氏体相变的影响  

Effect of force mode on martensite phase transformation of directional CuAl alloy

作　　者：刘锦平[1,2] 杨斌[1] 王智祥[1] 罗欣[2] 蒋黎明[2] 黄永发[2] 

机构地区：[1]江西理工大学材料科学与工程学院,赣州341000 [2]江西铜业集团公司,贵溪335424

出　　处：《中国有色金属学报》2014年第4期1020-1027,共8页The Chinese Journal of Nonferrous Metals

基　　金：江西省教育厅项目(GJJ13395);国家自然科学基金资助项目(50974063)

摘　　要：采用真空熔炼、氩气保护下拉式连续定向凝固方法制备不同取向马氏体Cu-12%Al(质量分数)合金线材。通过测试线坯拉伸和压缩力学性能,研究了力的作用方式对定向CuAl合金马氏体相变和力学性能的影响,并分析变形前后线坯的物相。结果表明:马氏体母相取向为[001]的线坯拉伸变形和压缩变形真应变分别为24.4%和14.7%,相应断口表现为韧性断裂和解理断裂;马氏体母相取向为[110]的线坯拉伸变形和压缩变形真应变分别为0.09和0.809,相应断口表现为准解理断裂和韧性断裂。取向为[001]线坯拉伸变形或取向为[110]线坯压缩变形均会发生由β1′马氏体转变为β1′马氏体,转变机制为Bain转变;取向为[110]线坯拉伸变形或取向为[001]线坯压缩变形均会发生由β1′马氏体转变为β1′马氏体。取向为[110]线坯压缩变形时会发生单滑移或者双滑移塑性变形,具有较好的塑性变形能力。Different orientation martensite wires, Cu-12%Al （mass fraction）, were prepared by vacuum melting and argon-shield vertical continuous directional solidification process. The mechanical properties were tested by tension and compression for directional CuAl alloy, the effects of force mode on the martensite and mechanical properties were investigated, and its phase before and after deformation were analyzed. The results show that, for [001] martensite parent phases orientation wires, the tensile and compression strains separately are 24.4% and 14.7%, corresponding fractures with ductile feature and cleavage feature. And for [110] orientation wires, the tensile and compression strains separately are 0.09 and 0.809, corresponding fractures with quasi-cleavage feature and ductile feature. For [001] orientation wires tensionor[011] orientation wires compression,the martensite 1β′transforms to martensite α1′by Baintrans formation mechanism, and for [001] orientation wires compression and [011] orientation wires tension, the martensiteβ1′ transforms to martensiteγ1′. [110] orientation wires show good plasticity due to single slip and double slips during compression deformation.

关 键 词：Cu-12%Al合金 连续定向凝固 马氏体相变 拉伸 压缩 

分 类 号：TG142.41[一般工业技术—材料科学与工程]