Structural and Thermodynamic Properties of TiAl intermetallics under High Pressure

Structural and Thermodynamic Properties of TiAl intermetallics under High Pressure
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TiAl金属间化合物在高压下的结构和热力学性能

DOI:
10.1088/0253-6102/57/1/21
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发表时间:
2012-01
影响因子:
3.1
通讯作者:
Hu Qian-Ku
Hu Qian-Ku
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Li Xu-Sheng;Wang Hai-Yan;Li Chang-Yun;Mi Guo-Fa;Hu Qian-Ku

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用从头算平面波赝势密度泛函方法研究了高压下TiAl金属间化合物的结构和热力学性质。结果表明,在0~20 Gpa压力范围内,晶格参数c与a的比值几乎保持不变,约为1.02,与实验结果吻合较好。当压力从20 Gpa增加到45 Gpa时,c/a值从1.02几乎线性地减小到0.99。这些计算结果表明,在低气压下,a轴和c轴的变化率基本相同,但在较高气压下,a轴的变化率小于c轴。通过准谐和德拜模型,研究了TiAl金属间化合物的状态方程,以及在不同压力和温度下的热膨胀和热容量。
The structural and thermodynamic properties of TiAl intermetallics under high pressure have been investigated by ab initio plane-wave pseudopotential density functional theory method. It is found that the ratio of lattice parameter c to a keeps almost constant with a value of 1.02 under the pressure from 0 to 20 GPa, which agrees well with the experimental results. With the pressure increasing from 20 to 45 GPa the values of c/a decrease almost linearly from 1.02 to 0.99. These calculated results indicate under low pressure the variation rate for a-axis is almost the same to that for c-axis, but under higher pressure the variation for a-axis is smaller than along c-axis. Through the quasi-harmonic Debye model, the equation of state (EOS) of TiAl intermetallics, as well as the thermal expansion and heat capacity at various pressures and temperatures are also studied.
DOI: 10.1088/0965-0393/2/5/003
发表时间: 1994-09
影响因子: 1.8
作者:
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