Phase Transformation and Shape Memory Effect of Ti–Pd–Pt–Zr High-Temperature Shape Memory Alloys

Yoko Yamabe-Mitarai, Wataru Takebe, Masayuki Shimojo

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

To understand the potential of high-temperature shape memory alloys, we have investigated the phase transformation and shape memory effect of Ti–(50 − x)Pt–xPd–5Zr alloys (x = 0, 5, and 15 at.%), which present the B2 structure in the austenite phase and B19 structure in the martensite phase. Their phase transformation temperatures are very high; Af and Mf of Ti–50Pt are 1066 and 1012 °C, respectively. By adding Zr and Pd, the phase transition temperatures decrease, ranging between 804 and 994 °C for Af and 590 and 865 °C for Mf. Even at the high phase transformation temperature, a maximum recovery ratio of 70% was obtained for one cycle in a thermal cyclic test. A work output of 1.2 J/cm3 was also obtained. The recovery ratio obtained by the thermal cyclic test was less than 70% because the recovery strain was < 1% and a large irrecoverable strain was obtained. The shape recovery was explained by the austenite strength. The training effect was also investigated.

Original languageEnglish
Pages (from-to)381-391
Number of pages11
JournalShape Memory and Superelasticity
Volume3
Issue number4
DOIs
Publication statusPublished - 2017 Dec 1

Keywords

  • Martensitic transformation
  • Shape memory alloys
  • Strain–temperature test
  • Titanium platinum
  • Work output

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials

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