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研究了不同退火温度对Ti-7.5Nb-4Mo-2Sn形状记忆合金的显微组织和超弹性能影响律,以及拉伸条件下合金的变形特性。利用X射线衍射仪、透射电镜、拉伸试验机等分别对600℃、700℃、800℃退火处理得到合金试样的显微组织和超弹性能进行表征测试,并通过数字图像相关法研究在拉伸条件下的变形特性。结果表明,Ti-7.5Nb-4Mo-2Sn合金中α→β相变温度在700℃与800℃之间,α相含量随着退火温度的升高而逐渐减少,800℃时α相含量为零。700℃和800℃处理后的合在金室温下表现出超弹性能。由于α相颗粒增强的作用700℃处理后得到的合金表现出更加优异的超弹性能。
The effects of annealing temperature on the microstructure and superelastic properties of Ti-7.5Nb-4Mo-2Sn shape memory alloy were studied, and the deformation characteristics of the alloy under tensile conditions were studied. The microstructure and superelastic properties of the alloy samples were characterized by X-ray diffraction, transmission electron microscopy, tensile testing machine and so on. The microstructure and superelastic properties of the samples were annealed at 600 ℃, 700 ℃ and 800 ℃, respectively. Deformation under tensile conditions. The results show that the α → β phase transition temperature of Ti-7.5Nb-4Mo-2Sn alloy is between 700 ℃ and 800 ℃, and the content of α phase decreases with the increase of annealing temperature. The α phase content at 800 ℃ is zero . The alloys treated at 700 ° C and 800 ° C exhibited superelastic properties at room temperature. The alloy obtained after 700 ℃ treatment showed more excellent superelastic properties due to the enhancement of α-phase particles.