Solid-solid transitions in titanium and zirconium at high pressures

Jayaraman, A. ; Klement Jr, W. ; Kennedy, G. C. (1963) Solid-solid transitions in titanium and zirconium at high pressures Physical Review, 131 (2). pp. 644-649. ISSN 0031-899X

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The body-centered cubic to hexagonal close-packed transformations in titanium and zirconium have been studied by means of differential thermal analysis at pressures in the range 0-65 kbar and at cooling and heating rates of 3-5°C/sec. The transitions occurred at different temperatures upon heating and upon cooling and these hysteresis intervals did not appear to vary much with increasing pressure and/or contamination. Alloying with the tantalum containers and consequent lowering of the transition temperatures was unavoidable in most of the experiments. The Ti transition decreases only slightly in temperature with increasing pressure; a zero pressure volume change of less than 0.3% is suggested. The Zr transition exhibits a slope of about -.24°C/kbar until a new transition is encountered near 58 kbar; the transition from body-centered cubic to the new Zr polymorph is without much hysteresis, and the phase boundary exhibits a slope of about 0.6°C/kbar. Discontinuities of about 17% in resistance at room temperature are detected near 51-59 kbar for Zr and 80-90 kbar for Ti, there being a decrease for Zr and an increase for the resistance of Ti.

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Source:Copyright of this article belongs to American Physical Society.
ID Code:13369
Deposited On:11 Nov 2010 08:32
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