(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)
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 马氏体转变为 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 马氏体转变为 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。
关键字: Cu-12%Al合金；连续定向凝固；马氏体相变；拉伸；压缩
（1. School of Materials Science and Engineering, Jiangxi University of Science and Technology, Ganzhou 341000 China;
2. Jiangxi Copper Corporation, Guixi 335424 China）
Abstract: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 tension or [011] orientation wires compression, the martensite transforms to martensite by Bain transformation mechanism, and for [001] orientation wires compression and [011] orientation wires tension, the martensite transforms to martensite . [110] orientation wires show good plasticity due to single slip and double slips during compression deformation.
Key words: Cu-12%Al alloy; continuous directional solidification; martensite phase transformation; tension; compression
