Phase transformation and thermal stability of aged Ti-Ni-Hf high temperature shape memory alloys

Xianglong Meng, Wei Cai, K. T. Lau, Li Min Zhou, Liancheng Zhao

Research output: Journal article publicationJournal articleAcademic researchpeer-review

8 Citations (Scopus)

Abstract

The use of Ni-rich TiNiHf alloys as high temperature shape memory alloys (SMAs) through aging has been presented. For Ni-rich Ti80-xNixHf20 alloys, their phase transformation temperatures are averagely increased more than 100 K by aging at 823 K for 2 h. Especially for the alloys with Ni-content of 50.4 at. pct and 50.6 at. pct, their martensitic transformation start temperatures (Ms) are more than 473 K after aging. TEM observation confirmed that some fine particles precipitate from the matrix during aging. The aged Ni-rich TiNiHf SMAs show the better thermal stability of phase transformation temperatures than the solution-treated TiNiHf alloys. The fine particles precipitated during aging should be responsible for the increase of phase transformation temperatures and its high stability.
Original languageEnglish
Pages (from-to)691-695
Number of pages5
JournalJournal of Materials Science and Technology
Volume22
Issue number5
Publication statusPublished - 1 Sep 2006

Keywords

  • Aging
  • High temperature shape memory alloy
  • Phase transformation
  • TiNiHf alloy

ASJC Scopus subject areas

  • Ceramics and Composites
  • Mechanics of Materials
  • Mechanical Engineering
  • Polymers and Plastics
  • Metals and Alloys
  • Materials Chemistry

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