Effects of Several Factors on the Ductility of the Ti-Ni Alloy

几种因素对钛镍合金塑性的影响

• 批准号: 63550498
• 负责人: MIYAZAKI Shuichi
• 金额: $ 1.6万
• 依托单位: University of Tsukuba
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1988
• 资助国家: 日本
• 起止时间: 1988 至 1989
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-63550498/
• 关键词: Shape memory alloy; Shape Memory Effect; Martensitic transformation; Ductility; Workability; Ti-NI; Superelasticity; Ti-Ni合金

The effects of the following several factors on the ductility of the Ti-Ni alloy have been investigated : Ni-concentration, test temperature, M_S temperature and heat-treatment. Tensile tests have been carried out for measuring the elongation(fracture strain), . which was mainly used as the measure of the ductility. The critical stresses for inducing slip deformation and martensites were measured for all cases in order to understand the effects of the above factors on the ductility.The elongation was measured in specimens solution-treated at 1273K as a function of Ni-concentration ranging from 50 to 52at% at the MS temperature, room temperature and 473K, respectively. The elongation decreased with increasing Ni-concentration ; the maximum elongation being about 70% for 50at%Ni, while the minimum being about 10% for 52at%Ni. The elongation obtained at M., was always the largest for any Ni-concentration, while the elongation at 473K was the smallest. Since the martensitic transformation does not occur at 473K during deformation, it was also found that the martensite phase is more ductile than the parent phase. The elongation obtained at various test temperatures ranging from 77 to 473K showed that the elongation at around M_S was the maximum for the solution-treated specimen ; for example, 70% around M_S, 50% at 77K and 24% at 473K, respectively, for the Ti-51at%Ni. However, the elongation of the age treated Ni-rich specimen did not show any test temperature dependence, the elongation being about 20% at any test temperature.The above results will be shown to be rationalized mainly in terms of the critical stress for slip deformation.

研究了Ni浓度、试验温度、M_S温度和热处理等因素对Ti-Ni合金塑性的影响。已经进行了拉伸试验以测量伸长率（断裂应变）。它主要被用作延展性的度量。为了了解上述因素对塑性的影响，测量了所有情况下诱发滑移变形和马氏体的临界应力，并测量了在MS温度、室温和473 K下1273 K固溶处理的试样的延伸率与Ni浓度（50 ~ 52at%）的函数关系。延伸率随Ni含量的增加而降低，当Ni含量为50at%时，延伸率最大，约为70%;当Ni含量为52at%时，延伸率最小，约为10%。在M.，在任何Ni浓度下，均为最大，而在473 K下的延伸率最小。由于马氏体相变在473 K变形过程中不发生，还发现马氏体相比母相更易延展。在77 ~ 473 K范围内的不同试验温度下的延伸率表明，固溶处理试样在M_S附近的延伸率最大，Ti-51at%Ni在M_S附近的延伸率为70%，在77 K时为50%，在473 K时为24%。然而，时效处理的富Ni试样的延伸率没有显示出任何试验温度依赖性，在任何试验温度下的延伸率都约为20%.The上述结果将主要根据滑移变形的临界应力来合理化。

项目成果

S.Miyazaki;et al.: Proceedings of International Conference on Martensitic Transformations,Sydney. (1989)

S.Miyazaki 等人：马氏体相变国际会议论文集，悉尼。

S.Miyazaki: "Effects of Several Factors on the Ductility of the Ti-Ni Alloy" Materials Science Forum. 56-58. 765-770 (1990)

S.Miyazaki：“几个因素对钛镍合金延展性的影响”材料科学论坛。

S. Miyazaki: "Determination of the Slip System in Ti-Ni Single Crystals" Proc. JIMIS-6 Inter. Symp. on Intermetallic Compounds, Sendai. (1991)

S. Miyazaki：“Ti-Ni 单晶滑移系统的测定”Proc。

S. Miyazaki: "Effects of Several Factors on the Ductility of the Ti-Ni Alloy" Materials Science Forum. 56-58. 765 (1990)

S. Miyazaki：“几个因素对钛镍合金延展性的影响”材料科学论坛。

S.Miyazaki: "Effects of Annealing on the Shape Memory and Pseudoelasticity Characteristics in the Equiatomic Ti-Ni Alloy" Acta Met.

S.Miyazaki：“退火对等原子钛镍合金形状记忆和伪弹性特性的影响”Acta Met。