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

Authors: Daróczi L.; Beke D. L.; Lexcellent C.; Mertinger V.

Source: Philosophical Magazine B, Volume 82, Number 1, 10 January 2002 , pp. 105-120(16)

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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 V_c/V and the entropy changes Delta

S_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 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 rarr

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 e_m (which corresponds to the martensite finish or austenite start) and e₀ are similar in both directions for the R-B19 prime

transformations, while for the B2-R transition it is negative for e₀.

Language: English

Document Type: Research article

Publication date: 2002-01-10

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