The analysis of thermal-induced phase transformation and microstructural evolution in Ni-Ti based shape memory alloys by molecular dynamics

Hsin Yu Chen, Nien-Ti Tsou*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Shape memory alloys has been widely applied on actuators and medical devices. The transformation temperature and microstructural evolution play two crucial factors and dominate the behavior of shape memory alloys. In order to understand the influence of the composition of the Ni-Ti alloys on the two factors, molecular dynamics was adopted to simulate the temperature-induced phase transformation. The results were post-processed by the martensite variant identification method. The method allows to reveal the detailed microstructural evolution of variants/phases in each case of the composition of Ni-Ti. Many features were found and having good agreement with those reported in the literature, such as the well-known Rank-2 herringbone structures; the X-interface; Ni-rich alloys have lower transformation temperature than Ti-rich alloys. In addition, some new features were also discovered. For example, the Ti-rich alloys enabled an easier martensitic transformation; the nucleated martensite pattern determined the microstructural evolution path, which also changed the atomic volume and temperature curves. The results generated in the current study are expected to provide the design guidelines for the applications of shape memory alloys.

Original languageEnglish
Pages (from-to)319-332
Number of pages14
JournalCMES - Computer Modeling in Engineering and Sciences
Volume120
Issue number2
DOIs
StatePublished - 1 Jan 2019

Keywords

  • Crystal variants
  • Molecular dynamics
  • Thermal-induced phase transformation
  • Transformation temperature

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