(1. 东北大学 材料物理与化学研究所，沈阳 110004；
2. 中国科学院 金属研究所，沈阳 110016)
摘 要: 采用XRD、DSC和拉伸试验机对热轧和冷轧Ni47Ti44Nb9形状记忆合金板材的织构、相变、拉伸和恢复性能进行研究，以便为提高Ni47Ti44Nb9合金的性能提供参考依据。结果表明：热轧板材中的{001}áuv0ñ和γ丝织构较强，冷轧板材的织构主要为γ丝；850 ℃退火冷轧板材的Ms点低于热轧板材的，且热滞明显提高；沿850 ℃退火板材轧向(RD)，应力诱发马氏体临界应力σM最高，与轧向成45˚角方向最低，且冷轧板材的应力诱发马氏体临界应力高于热轧板材的；850℃退火冷轧板沿不同方向可恢复应变基本接近，热轧板材存在差异，沿横向(TD)和45˚角方向高于冷轧板材。
关键字: Ni47Ti44Nb9形状记忆合金；相变；织构；拉伸性能；恢复应变
rolled Ni47Ti44Nb9 shape memory alloy sheet
（1. Institute of Materials Physics and Chemistry, Northeastern University, Shenyang 110004, China;
2. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China）
Abstract:The texture, transformation and tensile and recovery properties of hot-rolled and cold-rolled Ni47Ti44Nb9 shape memory alloy sheets were studied by XRD, DSC and tensile tester. The purpose was to provide reference data for improving properties of Ni47Ti44Nb9 alloys. The results show that {001}<uv0> and γ fibre textures in the hot-rolled sheet are more intense, and the main texture in cold-rolled sheet is γ fibre. Ms point of the cold-rolled sheet annealed at 850 ℃ is less than that of the hot-rolled sheet, and (As−Ms) obviously increases. The stress-induced martensite transformation critical stress σM of sheets annealed at 850 ℃ is maximum along RD and minimum along 45˚ angle to RD, and σM of the cold-rolled sheet is more than that of the hot-rolled sheet along different directions. The recovery strains of the cold-rolled sheet annealed at 850 ℃ are near along different directions and those of the hot-rolled sheet are different and more than those of the cold-rolled sheet along TD and 45˚ angle.
Key words: Ni47Ti44Nb9 shape memory alloy; transition; texture; tensile properties; recovery strain
