### Abstract

The effect of hydrostatic pressures on martensitic phase transformations in near-equiatomic Ti-Ni shape-memory alloys has been investigated up to 1.5 GPa. The relative volume changes δV_{c}/V and the entropy changes δS_{c} have also been determined at atmospheric pressure. Supposing that the volume derivative of the elastic energy differs from zero at the martensite start (and austenite finish) temperatures as well, that is e_{0} ≠ 0, and that the Clausius-Clapeyron equation is valid for the equilibrium transformation temperature T_{0}, it was shown that the dissipative energy terms were approximately zero for the B2-R transition. For the R → B19′ transformation this energy was independent of pressure, while for the reverse transformation it had a defmite pressure dependence. The pressure derivatives of elastic energy e_{m} (which corresponds to the martensite finish or austenite start) and e_{0} are similar in both directions for the R-B19′ transformations, while for the B2-R transition it is negative for e_{0}.

Original language | English |
---|---|

Pages (from-to) | 105-120 |

Number of pages | 16 |

Journal | Philosophical Magazine B: Physics of Condensed Matter; Statistical Mechanics, Electronic, Optical and Magnetic Properties |

Volume | 82 |

Issue number | 1 |

DOIs | |

Publication status | Published - Jan 2002 |

### ASJC Scopus subject areas

- Chemical Engineering(all)
- Physics and Astronomy(all)

## Fingerprint Dive into the research topics of 'Effect of hydrostatic pressure on the martensitic transformation in near equiatomic Ti-Ni alloys'. Together they form a unique fingerprint.

## Cite this

*Philosophical Magazine B: Physics of Condensed Matter; Statistical Mechanics, Electronic, Optical and Magnetic Properties*,

*82*(1), 105-120. https://doi.org/10.1080/13642810208211219