In-situ SEM observations of nucleation and growth of thermoelastic martensitic transformation in shape memory alloys

Yohei Soejima, Takayuki Miyoshi, Tomonari Inamura, Minoru Nishida

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The nucleation, growth, forward and reverse transformation processes of thermoelastic martensite (TM) in shape memory alloys have been investigated by in-situ SEM cooling and heating observations. The homogeneous-like nucleation from the grain interior was observed in Ti-Ni, Ti-Nb-Al, Ti-Ni-Pd alloys. On the other hand, the heterogeneous nucleation from the grain boundary was observed in Ni-Mn-Ga, Cu-Al-Mn, Cu-Al-Ni alloys. In addition, the microstructure memory effect (MME) of the M phase only occurs during thermal cycles in the Ti-Nb-Al alloy. It is suggested that there is intimate relation between the nucleation site and the distribution of elastic stress field due to the anisotropy of thermal expansion coefficient. It is assumed that the change of internal stress field in the parent (P) phase during transformation cycles prevents MME.

Original languageEnglish
Title of host publicationPTM 2015 - Proceedings of the International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2015
EditorsLong-Qing Chen, Matthias Militzer, Gianluigi Botton, James Howe, Chadwick Sinclair, Hatem Zurob
PublisherInternational Conference on Solid-Solid Phase Transformations in Inorganic Materials 2015
Pages649-650
Number of pages2
ISBN (Electronic)9780692437360
Publication statusPublished - 2015
EventInternational Conference on Solid-Solid Phase Transformations in Inorganic Materials 2015, PTM 2015 - Whistler, Canada
Duration: Jun 28 2015Jul 3 2015

Publication series

NamePTM 2015 - Proceedings of the International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2015

Other

OtherInternational Conference on Solid-Solid Phase Transformations in Inorganic Materials 2015, PTM 2015
CountryCanada
CityWhistler
Period6/28/157/3/15

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Inorganic Chemistry
  • Materials Chemistry
  • Metals and Alloys

Fingerprint Dive into the research topics of 'In-situ SEM observations of nucleation and growth of thermoelastic martensitic transformation in shape memory alloys'. Together they form a unique fingerprint.

Cite this