采用ＳＥＭ、ＥＤＳ及ＯＭ 方法， 对Ａｇ － ＳｎＯ２ 的变形断裂样品进行研究， 结果表明，该材料加工变形困难、硬度高， 不易通过热处理回复再结晶的主要原因是ＳｎＯ２ 粒度较细（１μｍ） ， 阻碍了金属变形时的滑移行为。同时， 由于ＳｎＯ２ 密度较低， 在相同质量比的情况下， 体积分数较高。因此， 颗粒强化效果明显， 在Ａｇ － ＳｎＯ２ 的冷变形过程中， 材料内部存在位错及显微孔洞应力松弛现象， 使硬化曲线呈起伏状平缓上升。对强化增量贡献最大的是由粒子掺入导致的位错增值及晶粒细化效应。对断口的ＳＥＭ、ＥＤＳ分析还表明： Ａｇ －ＳｎＯ２ 材料的断裂类型为韧性断裂， 并且断裂沿塑性较好的Ａｇ 基体中进行 The deformation and fracture samples of Ag - SnO2 were studied by SEM, EDS and OM. The results show that the main reason for the deformation and fracture of Ag - SnO2 is that it is difficult to deform and hard to be recrystallized by heat treatment. The slip behavior of metal deformation. At the same time, due to the lower density of SnO2, the volume fraction is higher at the same mass ratio. Therefore, the grain strengthening effect is obvious. During the cold deformation of Ag - SnO2, dislocations and pore relaxation occur in the material, causing the hardening curve to rise gently. The greatest contribution to the enhanced increment is the increase of dislocation value and grain refinement caused by particle incorporation. The SEM and EDS analyzes of the fracture also show that the fracture type of the Ag-SnO2 material is ductile fracture and the fracture is carried out in a well-ductile Ag matrix