Abstract
The effect of pressure on the α ⇄ β and ω ⇄ β transformations in the equiatomic alloy TiZr is studied by the differential thermal analysis (DTA) and calorimetric technique. The α-β equilibrium at atmospheric pressure occurs at a temperature of 579°C, and the heat of transition ΔH is 40.9±2.0 J/g. As the pressure increases up to 28 kbar, the temperature of the α-β equilibrium linearly decreases, dT/dP=−2.2±0.3 K/kbar. In the pressure range 28–48 kbar, the β-phase undergoes a transition to the two-phase (α + ω) state upon cooling to room temperature. At pressures above the triple point with the coordinates P=49±3 kbar and T=460±30°C, the cooling of the β-phase gives rise to only the hexagonal ω-phase with the unit cell parameters a=4.843 Å, c=2.988 Å, and c/a=0.617 under normal conditions. The slope of the ω-β equilibrium boundary is positive at pressures up to 70 kbar, dT/dP≈0.46 K/kbar. The ω → α transformation at atmospheric pressure proceeds in the temperature range T=425–470°C with the enthalpy of transition ΔH=2.8 J/g.
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Translated from Fizika Tverdogo Tela, Vol. 42, No. 1, 2000, pp. 163–169.
Original Russian Text Copyright © 2000 by Bashkin, Pagnuev, Gurov, Fedotov, Abrosimova, Ponyatovski\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \).
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Bashkin, I.O., Pagnuev, A.Y., Gurov, A.F. et al. Phase transformations in equiatomic alloy TiZr at pressure up to 70 kbar. Phys. Solid State 42, 170–176 (2000). https://doi.org/10.1134/1.1131187
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DOI: https://doi.org/10.1134/1.1131187