Thermal activation of stress-induced martensitic transformation in Ni-rich Ti-Ni alloys

K. Niitsu, H. Date, R. Kainuma

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

We performed compression tests at low temperatures under various strain rates for Ni-rich Ti-Ni alloys. Thermal activation theory for the habit plane motion with a thermal activation energy of ~0.5 eV successfully reproduced both the examined temperature and strain-rate dependences of the transformation stress hysteresis. This indicates that the thermal activation process of the habit plane motion underlies the dramatic increase in the transformation hysteresis at lower temperatures in this system. These findings are critical to elucidate the physical impact of the thermal activation nature on the transformation hysteresis and to consider the feasibility of low-temperature operation of shape-memory functions.

Original languageEnglish
Pages (from-to)263-267
Number of pages5
JournalScripta Materialia
Volume186
DOIs
Publication statusPublished - 2020 Sep

Keywords

  • Martensitic transformation
  • Phase transformation kinetics
  • Shape memory alloy
  • Strain rate
  • Thermal activation

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys

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