Experimental constraints on the phase diagram of titanium metal

被引：32

作者：

Zhang, Jianzhong ^{[1
]}

Zhao, Yusheng ^{[1
]}

Hixson, Robert S. ^{[1
]}

Gray, George T., III ^{[1
]}

Wang, Liping ^{[2
]}

Utsumi, Wataru ^{[3
]}

Hiroyuki, Saito ^{[3
]}

Takanori, Hattori ^{[3
]}

机构：

[1] Los Alamos Natl Lab, Los Alamos, NM 87545 USA

[2] SUNY Stony Brook, Inst Mineral Phys, Stony Brook, NY 11794 USA

[3] Japan Atom Energy Res Inst, Synchrotron Radiat Res Ctr, Mikazuki, Hyogo 6795148, Japan

来源：

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 2008年 / 69卷 / 10期

关键词：

Metals; High pressure; X-ray diffraction; Phase transitions; Thermodynamic properties;

D O I：

10.1016/j.jpcs.2008.05.016

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The phase transformations of titanium metal have been studied at temperatures and pressures up to 973 K and 8.7 GPa using synchrotron X-ray diffraction. The equilibrium phase boundary of the alpha-omega transition has a dT/dP slope of 345 K/GPa, and the transition pressure at room temperature is located at 5.7 GPa. The volume change across the alpha-omega transition is Delta V = 0.197cm(3)/mol, and the associated entropy change is Delta S = 0.57J/mol K. Except for Delta V, our results differ substantially from those of previous studies based on an equilibrium transition pressure of 2.0 GPa at room temperature. The alpha-omega-beta triple point is estimated to be at 7.5 GPa and 913 K, which is comparable with previous results obtained from differential thermal analysis and resistometric measurements. An update, more accurate phase diagram is established for Ti metal based on the present observations and previous constraints on the alpha-beta and omega-beta phase boundaries. (C) 2008 Elsevier Ltd. All rights reserved.

引用

页码：2559 / 2563

页数：5

共 33 条

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