Effect of hydrostatic pressure on the martensitic transformation in near equiatomic Ti-Ni alloys

L. Daróczi, D. Beke, C. Lexcellent, V. Mertinger

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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 ΔVc/V and the entropy changes ΔSc 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 e0 ≠ 0, and that the Clausius-Clapeyron equation is valid for the equilibrium transformation temperature T0, 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 definite pressure dependence. The pressure derivatives of elastic energy em (which corresponds to the martensite finish or austenite start) and e0 are similar in both directions for the R-B19′ transformations, while for the B2-R transition it is negative for e0.

Original languageEnglish
Pages (from-to)105-120
Number of pages16
JournalPhilosophical Magazine B: Physics of Condensed Matter; Statistical Mechanics, Electronic, Optical and Magnetic Properties
Volume82
Issue number1
DOIs
Publication statusPublished - Jan 10 2002

Fingerprint

Martensitic transformations
martensitic transformation
Hydrostatic pressure
hydrostatic pressure
Martensite
Austenite
austenite
martensite
Derivatives
Shape memory effect
Atmospheric pressure
energy
Entropy
shape memory alloys
Phase transitions
pressure dependence
phase transformations
atmospheric pressure
Temperature
entropy

ASJC Scopus subject areas

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

Cite this

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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 ΔVc/V and the entropy changes ΔSc 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 e0 ≠ 0, and that the Clausius-Clapeyron equation is valid for the equilibrium transformation temperature T0, 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 definite pressure dependence. The pressure derivatives of elastic energy em (which corresponds to the martensite finish or austenite start) and e0 are similar in both directions for the R-B19′ transformations, while for the B2-R transition it is negative for e0.",
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T1 - Effect of hydrostatic pressure on the martensitic transformation in near equiatomic Ti-Ni alloys

AU - Daróczi, L.

AU - Beke, D.

AU - Lexcellent, C.

AU - Mertinger, V.

PY - 2002/1/10

Y1 - 2002/1/10

N2 - 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 ΔVc/V and the entropy changes ΔSc 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 e0 ≠ 0, and that the Clausius-Clapeyron equation is valid for the equilibrium transformation temperature T0, 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 definite pressure dependence. The pressure derivatives of elastic energy em (which corresponds to the martensite finish or austenite start) and e0 are similar in both directions for the R-B19′ transformations, while for the B2-R transition it is negative for e0.

AB - 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 ΔVc/V and the entropy changes ΔSc 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 e0 ≠ 0, and that the Clausius-Clapeyron equation is valid for the equilibrium transformation temperature T0, 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 definite pressure dependence. The pressure derivatives of elastic energy em (which corresponds to the martensite finish or austenite start) and e0 are similar in both directions for the R-B19′ transformations, while for the B2-R transition it is negative for e0.

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