(北京有色金属研究总院 有色金属材料制备加工国家重点实验室，北京 100088)
摘 要: 采用真空感应熔炼的方法制备3种不同Ni摩尔分数的NiTi合金，研究Ni摩尔分数对NiTi合金相变及力学性能的影响，并观察合金的金相组织及拉伸断口形貌。研究结果表明：随着Ni含量增加，合金的相变温度迅速降低，冷却过程发生两阶段相变A→R→M。随着Ni含量增加，合金的抗拉强度增加，伸长率下降。
关键字: 形状记忆合金；NiTi合金；相变；力学性能；微观组织
（State Key Lab of Nonferrous Metals & Processes,
General Research Institute for Non-Ferrous Metals, Beijing 100088, China）
Abstract:The effect of Ni content on phase transformation and mechanical properties of NiTi alloys was investigated by means of tension test, DSC, OM, and SEM. From the results it can be determined that as the Ni content increased, the phase transformation temperatures rapidly decreased, and two-stage transformation occurred during cooling: A→R→M. As the Ni content increased, the tensile strength of NiTi alloys rapidly increased, while the fracture elongation decreased.
Key words: shape memory alloy; NiTi alloy; phase transformation; mechanical properties; microstructure
