Ti—Al系金属间化合物的氢脆机理

Hydrogen Embrittlement in Titanium Aluminides

摘要:

根据固体与分子经验电子理论发析计算了Ｔｉ－Ａｌ系金属化合物及含氢各相的价电子结构与解理能，结果表明：ＴｉｓＡｌ的氢脆是由于高氢含量下易生成δ脆性相引起的，而ＴｉＡｌ的氢脆是由于固溶氢减弱了含氢ＴｉＡｌ晶胞主干键并降低了解理能引起的，同时解释了一些尚有矛盾的实验结果，并提出了一些解决氢脆的实际方法。

Abstract:

By means of the empirical electron theory (EET),the valence electron structures and cleavage energy(Gc) of titanium aluminides with hydrogen are calculated. The analysis shows that hydrogen embrittlement in Ti3Al results from brittle phase() transformation, and hydrogen embrittlement in TiAl results from solute hydrogen induced weakening of main bonds in the TiAl crystal cell with hydrogen, which results in a decrease of the cleavage energy, Gc. A practical method of reducing hydrogen embrittlement are proposed.