Microstructure in the cubic to monoclinic transition in titanium-nickel shape memory alloys
Microstructure in the cubic to monoclinic transition in titanium-nickel shape memory alloys
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DOI：
10.1016/s1359-6454(99)00143-3
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发表时间：
1999-07-09
期刊：
影响因子：
9.4
通讯作者：
Shield, TW
中科院分区：
文献类型：
--
作者：
Hane, KF;Shield, TW
考虑了技术上重要的钛镍形状记忆合金中立方晶向单斜晶转变的微观结构。使用马氏体转变的几何非线性理论，孪生马氏体、奥氏体-马氏体、楔形；研究了三角形和金刚石的微观结构。具体来说，对于晶格参数的任何选择，化合物、I型和II型孪晶都是可能的；而非标准孪晶可能仅存在于特殊的晶格参数中。此外，对于特定的 Ti-Ni 合金，发现了 192 个习惯面，但在实验中仅明确观察到了 24 个。此外，在这种合金中可以出现孪生楔形，但三角形和菱形则不行。后三种是特殊的微观结构，它们提供了一种机制，通过该机制样品可以轻松转变，并且仅适用于具有特定晶格参数的合金。给出了各种微观结构的完整枚举，并提出了算法，以便可以使用不同的晶格参数重复计算。 (C) 1999 年由 Elsevier Science Ltd 代表 Acta Metallurgica Inc. 出版。保留所有权利。
Microstructure in the cubic to monoclinic transition in the technologically important Ti-Ni shape memory alloys is considered. Using a geometrically nonlinear theory of martensitic transformations, the twinned martensite, austenite-martensite, wedge; triangle, and diamond microstructures are studied. Specifically, compound, type I, and type II twins are possible for any choice of the lattice parameters; while, non-standard twins may exist with special lattice parameters only. In addition, 192 habit planes are found for a particular Ti-Ni alloy, but only 24 have been unambiguously observed in experiments. Further, the twinned wedge is possible in this alloy, but the triangle and diamond are not. These latter three are special microstructures, which provide a mechanism through which a specimen can easily transform and are possible only for alloys with specific lattice parameters. A complete enumeration of the various microstructures is given, and algorithms are presented so that the calculations can be repeated with different lattice parameters. (C) 1999 Published by Elsevier Science Ltd. On behalf of Acta Metallurgica Inc. All rights reserved.