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Thermal Expansion and Other Thermodynamic Properties of α2-Ti3Al and γ-TiAl Intermetallic Phases from First Principles Methods

机译:基于第一原理方法的α2-Ti3Al和γ-TiAl金属间相的热膨胀及其他热力学性质

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摘要

Anisotropic thermal expansion coefficients of tetragonal γ-TiAl and hexagonal α2-Ti3Al phases were calculated using first principles methods. Two approaches with different computational costs and degrees of freedom were proposed. The predicted values were compared with available experimental data showing that for γ-TiAl, the more computational demanding method with decoupled impact of volume and temperature effects on the cell shape leads to significantly better results than that with only ground-state optimised unit cell geometry. In the case of the α2-Ti3Al phase, both approaches yielded comparable results. Additionally, heat capacity and bulk modulus were evaluated as functions of temperature for both phases, and were fitted to provide an analytical formula which can be further used.
机译:四方 γ的各向异性热膨胀系数> -TiAl和六边形 使用第一原理方法计算了 α 2 -Ti3Al相。提出了两种计算成本和自由度不同的方法。将预测值与可用的实验数据进行比较,该数据显示了 < mi>γ -TiAl,对体积和温度的影响对单元格形状具有去耦合影响的计算要求更高的方法,其结果要比仅对基态优化的单元格更好。几何。对于 α< / mi> 2 -Ti3Al相,两种方法均产生了可比的结果。另外,评估了两个相的热容和体积模量作为温度的函数,并拟合以提供可进一步使用的分析公式。

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