为了研究金属基复合材料超塑变形时液相的作用 ,分析了金属基复合材料界面处的局部应力 .当由滑移引起的界面处局部应力值高于外界施加于界面处应力值时 ,复合材料在含有液相的状态下超塑变形能力最大 ;反之 ,变形能力在不含液相的纯固相状态最大 .因此 ,可以认为塑性变形过程中当有应力集中产生时 ,为了缓解应力集中 ,液相必需存在才能取得超塑性 .当无应力集中时 ,超塑变形不需要液相的存在 .上述理论与实验结果是一致的 In order to study the effect of liquid phase on superplastic deformation of metal matrix composites, the local stress at the interface of metal matrix composites is analyzed. When the local stress at the interface caused by slip is higher than the external stress applied at the interface, The material has the highest superplastic deformation capacity under the condition of containing liquid phase; on the contrary, the deformability is the largest in the pure solid phase without liquid phase, so that when stress concentration occurs in the plastic deformation process, in order to alleviate the stress concentration, Liquid must exist in order to obtain superplastic.When no stress concentration, superplastic deformation does not require the presence of liquid.The above theoretical and experimental results are consistent