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利用电阻法和不同温度下的系列拉伸研究了Ni_(47)Ti_(44)Nb_9合金的相变及拉伸变形行为。结果表明:合金的拉伸变形行为强烈地依赖于拉伸变形温度。在Ms点以下,发生马氏体变体的再取向,其临界屈服应力随温度降低出现一极小值,在Ms和M_s~δ温度区间,应力诱发马氏体相变,其临界屈服应力随温度升高而降低。在略高于M_s~δ温度,延伸率出现一极小值,而在M_s~δ和Ms之间延伸率出现一极大值。形变使马氏体的逆相变点显著升高。
The phase transformation and tensile deformation behavior of Ni_ (47) Ti_ (44) Nb_9 alloy were investigated by means of electrical resistance method and tensile tests at different temperatures. The results show that the tensile deformation behavior of the alloy strongly depends on the tensile deformation temperature. Below the Ms point, the reorientation of martensite occurs, and the critical yield stress decreases with temperature to a minimum. At Ms and M_s ~ δ, the stress-induced martensitic transformation has a critical yield stress Lower temperature. At temperatures slightly above M_s ~ δ, there is a minimum in elongation and a maximum in elongation between M_s ~ δ and Ms. Deformation so martensitic reverse phase change point increased significantly.