Martensitic Transformation and Superelastic Properties of Ti-Nb Base Alloys
Martensitic Transformation and Superelastic Properties of Ti-Nb Base Alloys
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DOI：
10.2320/matertrans.m2014454
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发表时间：
2015-01-01
影响因子：
1.2
通讯作者：
Miyazaki, Shuichi
中科院分区：
文献类型：
--
作者：
Kim, Hee Young;Miyazaki, Shuichi
Ti-Nb基合金因其优异的力学性能和良好的生物相容性而被认为是无镍生物医用超弹性合金的潜在候选者，目前已开发出多种具有形状记忆效应或超弹性的Ti-Nb基合金。然而，典型的Ti-Nb基超弹性合金表现出较小的恢复应变，不到实际Ti-Ni超弹性合金恢复应变的三分之一。在过去的十年里，人们通过组织控制和合金化来改善Ti-Nb基超弹性合金的性能。低温热处理和时效对提高滑移的临界应力非常有效，这是由于细小的亚晶组织和沉淀硬化所致。O、N等间隙合金元素的加入提高了滑移的临界应力，改善了超弹性性能。本文综述了合金元素对Ti-Nb基合金的马氏体相变温度、晶体结构、显微组织和变形行为的影响，并提出了生物医用超弹性合金的设计策略。
Ti-Nb base alloys have been proposed as prospective candidates for Ni-free biomedical superelastic alloys due to their excellent mechanical properties with good biocompatibility, and many kinds of Ti-Nb base alloys exhibiting shape memory effect or superelasticity have been developed up to now. However, typical Ti-Nb base superelastic alloys show a small recovery strain which is less than one third of the recovery strain of practical Ti-Ni superelastic alloys. Over the last decade there have been extensive efforts to improve the properties of Ti-Nb base superelastic alloys through microstructure control and alloying. Low temperature annealing and aging are very effective to increase the critical stress for slip due to fine subgrain structure and precipitation hardening. The addition of interstitial alloying elements such as O and N raises the critical stress for slip and improves superelastic properties. In this paper, the roles of alloying elements on the martensitic transformation temperature, crystal structure, microstructure and deformation behavior in the Ti-Nb base alloys are reviewed and the alloy design strategy for biomedical superelastic alloys is proposed.