Ｃｏ元素的加入对ＮｉＡｌ合金的机械合金化过程及产物有很大影响·Ｃｏ含量变化使反应机制发生明显改变，并同时得到不同的反应产物·Ｃｏ含量为５％（原子分数）时，反应机制仍属于爆炸式反应，粉末颗粒较细且均匀；但１０％（原子分数）Ｃｏ元素的加入抑制了ＮｉＡｌ化合物爆炸式反应生成，并导致类“非晶”相的生成；而Ｃｏ含量为２０％（原子分数）时，导致了γＮｉ（Ａｌ，Ｃｏ）过饱和固溶体的形成·粉末颗粒最大，均匀性较差· The addition of Co element has a great influence on the mechanical alloying process and the product of NiAl alloy. The change of Co content changes the reaction mechanism obviously, and at the same time different reaction products are obtained. When the content of Co is 5% (atomic fraction), the reaction mechanism But still belongs to the explosive reaction. The powder particles are fine and uniform. However, the addition of 10% (atomic fraction) Co inhibits the explosive reaction of NiAl compounds and leads to the formation of “amorphous” phases. The Co content is 20% (Atomic fraction), resulting in the formation of γNi (Al, Co) supersaturated solid solution, the largest powder particles, poor uniformity