通过定向凝固技术制备的ＮｉＡｌ基双相合金Ｎｉ－３１Ａｌ，是一种“编织状”γ′纤维增强的ＮｉＡｌ基内生复合材料。在铸态时β和γ′相存在着确定的取向关系。经不同冷却方式的热处理后发现，合金组织结构发生不同程度的变化，其中空冷或油淬后Ｎｉ－３１Ａｌ的β相大部分转变成了ＮｉＡｌ马氏体相 The NiAl-based Ni-31Al alloy prepared by directional solidification technique is a kind of “braided” γ ’fiber reinforced NiAl-based composite. There is a definite orientation relationship between β and γ ’phases during as-cast. After heat treatment under different cooling methods, it was found that the microstructures of the alloy changed to some extent. Most of the β phase of Ni-31Al transformed into NiAl martensite phase after air cooling or oil quenching