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arXiv 1002.2482cond-mat.mtrl-scicond-mat.stat-mech
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\textit{Ab initio}研究Ni-Ti记忆合金中$β$ -相的相互作用晶格振动和稳定化

\textit{Ab initio} study of interacting lattice vibrations and stabilization of the $β$-phase in Ni-Ti shape-memory alloy

Petros Souvatzis, Dominik Legut, Olle Eriksson, Mikhail I. Katsnelson

摘要:

用于预测晶体中相变的晶格动力学方法通常评估谐波声子谱,因此在谐波近似下晶体结构不稳定的频繁和重要情况下不起作用,例如当$β$结构作为记忆合金(SMA)NiTi的高温相出现时。本文通过自洽的{ \it ab initio}晶格动力学计算(SCAILD)表明,NiTi中从预马氏体$R$到$β$相变的临界温度可以有效地精确计算,并且$β$ -相主要是不同晶格振动之间相互稳定作用的结果。

英文摘要:

Lattice dynamical methods used to predict phase-transformations in crystals typically evaluate the harmonic phonon spectra and therefore do not work in frequent and important situations where the crystal structure is unstable in the harmonic approximation, such as the $β$ structure when it appears as a high-temperature phase of the shape memory alloy (SMA) NiTi. Here it is shown by self consistent {\it ab initio} lattice dynamical calculations (SCAILD) that the critical temperature for the pre-martensitic $R$ to $β$ phase-transformation in NiTi can be effectively calculated with good accuracy, and that the $β$-phase is a result primarily of the stabilizing interaction between different lattice vibrations.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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