Thermal cyclic properties of ti-pd-pt-zr high-temperature shape memory alloys

Wataru Tasaki, Masayuki Shimojo, Yoko Yamabe-Mitarai

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

In this study, the thermal cyclic properties of Ti-(50-x)Pd-xPt-5Zr alloys (x = 5, 15, 25, at%), comprising B2 and B19 structures in austenite and martensite, were investigated by a thermal cyclic compression test under a constant load of between 15 and 200 MPa. The transformation temperature measured using differential scanning calorimetry increased with increasing Pt concentration. The highest austenite finishing (Af) temperature, 648C, was obtained in the Ti-25Pd-25Pt-5Zr alloy. Irrecoverable strain due to thermal cyclic testing was observed during each test, even at a stress of 50 MPa. The work output, calculated as the product of the transformation strain and the applied stress from strain–temperature curves, decreased with increasing Pt concentration. This was because of the lower strength of the austenite phase due to Af increasing with an increase in the concentration of Pt. Although irrecoverable strain was observed with the first thermal cycle test, it decreased after several thermal cyclic tests, which are called training.

Original languageEnglish
Article number595
JournalCrystals
Volume9
Issue number11
DOIs
Publication statusPublished - 2019 Nov

Keywords

  • Shape memory alloys
  • Thermal cyclic properties
  • Titanium palladium
  • Training

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Inorganic Chemistry

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