采用熔炼法浇注出Ti50Ni45Cu5合金铸锭, 对其进行均匀化处理、固溶处理后, 再进行变形量为25%的冷轧, 最后分别在400, 500, 600, 700 ℃下进行1 h的退火处理, 研究了退火温度对合金相变温度、力学性能以及摩擦磨损性能的影响。结果表明: 随着退火温度的升高, 合金的强度、硬度降低, 塑性升高, 相变温度降低; 400 ℃退火后的合金具有优良的综合力学性能, 其抗拉强度为996 MPa, 伸长率为8.2%; 合金在－50～150 ℃升温/降温过程中发生B2→B19′相变; 退火态Ti50Ni45Cu5合金的磨损机制为剥层磨损, 且随着退火温度的升高, 合金的耐磨性能降低; 由于应力诱导马氏体相变的作用, 合金的耐磨性能较高, 400 ℃退火后合金的摩擦因数为0.605 7, 磨损质量为0.007 4 g。

Ti50Ni45Cu5 (at.%) alloy ingot was prepared by smelting technique, and then a series of treatments were carried out as follows: homogenization and solid-solution treatment, cold rolling to reach 25% reduction and annealing at 400, 500, 600 and 700 ℃. The effects of annealing temperature on phase transformation temperature, mechanical properties and friction and wear properties of the alloy were studied. The results show that strength, hardness and martensite phase transformation temperatures of the alloy decreased while the plasticity increased with the increase of annealing temperature. Furthermore, the alloy annealed at 400 ℃ exhibited excellent comprehensive mechanical performances, and its tensile strength up to 996 MPa and elongation was 8.2%. The B2→B19′ transformation in Ti50Ni45Cu5 alloy had been found over a wide temperature range from -50 ℃ to +150 ℃. The wear mechanism of Ti50Ni45Cu5 alloy was spalling wear, and the wear-resistance decreased with the increase of annealing temperature. The alloy acquired good wear resistance due to the stress-induced martensite phase transformation. Moreover, the friction coefficient of the alloy annealed at 400 ℃ was 0.605 7 and wear mass loss was 0.007 4 g.