通过急冷凝固,在Al含量超过化学计量值(25at.—％)的Ni_3Al和Ni_3Al(B)中会出现一种片层状的两相组织。经电子衍射和X射线衍射分析确定为基体γ’相和亚稳相。利用约化胞方法计算表明亚稳相为正交结构(α=0.2355nm,b=0.4157nm,c=0.1683nm),实验结果还表明,硼合金化对片层状组织的形成没有影响。
A laminar biphase structure may occur in rapidly solidified Ni_3Al and Ni_3Al(B)with over stoichiometrical Al content (25at.--%). Both electron and X--ray diffraction analyses showed that one is matrix phase γ' and other is a metastable phase. After calculation of lattice parameter by reduced cell method, the metastable phase is an orthorhombic structure of a=0.2355 nm, b=0.4157 nm and c=0.1683 nm. It was also proved experimentally that boron alloying does not influence the formation of laminar structure.
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