(1. 江西理工大學(xué) 材料科學(xué)與工程學(xué)院，贛州 341000；
2. 江西銅業(yè)集團(tuán)公司，貴溪 335424)
摘 要: 采用真空熔煉、氬氣保護(hù)下拉式連續(xù)定向凝固方法制備不同取向馬氏體Cu-12%Al(質(zhì)量分?jǐn)?shù))合金線材。通過測(cè)試線坯拉伸和壓縮力學(xué)性能，研究了力的作用方式對(duì)定向CuAl合金馬氏體相變和力學(xué)性能的影響，并分析變形前后線坯的物相。結(jié)果表明：馬氏體母相取向?yàn)閇001]的線坯拉伸變形和壓縮變形真應(yīng)變分別為24.4%和14.7%，相應(yīng)斷口表現(xiàn)為韌性斷裂和解理斷裂；馬氏體母相取向?yàn)閇110]的線坯拉伸變形和壓縮變形真應(yīng)變分別為0.09和0.809，相應(yīng)斷口表現(xiàn)為準(zhǔn)解理斷裂和韌性斷裂。取向?yàn)閇001]線坯拉伸變形或取向?yàn)閇110]線坯壓縮變形均會(huì)發(fā)生由 馬氏體轉(zhuǎn)變?yōu)?馬氏體，轉(zhuǎn)變機(jī)制為Bain轉(zhuǎn)變；取向?yàn)閇110]線坯拉伸變形或取向?yàn)閇001]線坯壓縮變形均會(huì)發(fā)生由 馬氏體轉(zhuǎn)變?yōu)?馬氏體。取向?yàn)閇110]線坯壓縮變形時(shí)會(huì)發(fā)生單滑移或者雙滑移塑性變形，具有較好的塑性變形能力。
關(guān)鍵字: Cu-12%Al合金；連續(xù)定向凝固；馬氏體相變；拉伸；壓縮
（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
