根据γ-TiAl层状晶体(PST晶体)的微观结构,构造了可使用有限元计算的夹心基元。由有限元计算表明,当裂尖平行于片层时,裂尖前端所有滑移系上的分切应力都很小,即滑移较弱,而沿片层界面(它总是解理面之一)的正应力有最大值,这表明,裂尖将沿片层扩展,而且塑性小。当裂纹垂直于片层时,裂尖前端很多滑移系上的分切应力都很大,最大正应力并不在片层界面上,而总在跨片层的解理面上,这表明,裂尖在片层内解理,并且塑性很大。
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