利用第一原理平面波赝势方法,计算了含不同过渡族合金原子时Al2O3和TiO2的氧化能,据此分析了合金化对Al2O3和TiO2相对稳定性的影响.计算结果表明,几乎所有合金元素均增加Al2O3和TiO2的氧化能,使其稳定性下降.Al2O3和TiO2氧化能的差值表明,Nb,Mo,W,Re等显著降低Al2O3相对于TiO2的稳定性,因此,可抑制γ-TiAl中Al组分的内氧化,提高γ-TiAl的高温抗氧化性能.
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