Fatigue Crack Initiation Mechanisms in Nickel Aluminides

金属间材料作为一种高温结构材料具有很大的潜力。对Ni3Al和NiAl金属间化合物单晶疲劳裂纹萌生机制进行了研究。这两个化合物代表了两种重要的超晶格类型，即L12 （Ni3Al）和B2 （NiAl）。这些金属间化合物的疲劳裂纹起裂行为将作为取向、测试温度和环境的函数进行研究。本文将测试Ni3Al的空位诱导裂纹起裂模型。

Intermetallic materials have a great potential as a high temperature structural material. A study of fatigue crack initiation mechanisms in single crystals of Ni3Al and NiAl intermetallics is proposed. These two compounds represent two important superlattice types, viz., L12 (Ni3Al) and B2 (NiAl). The fatigue crack initiation behavior in these intermetallics will be studies as a function of orientation, test temperature, and environment. A vacancy-induced crack initiation model for Ni3Al will be tested.