中文摘要：

使用反应合成法制备了Ag／SnO2材料，考察了Ag／SnO2材料在大塑性变形过程中的组织均匀化及性能变化情况。经SEM分析表明，随挤压真应变的增加，类纤维状组织逐渐消失，SnO2颗粒分布由团聚逐渐均匀分布；经电导率、抗拉强度、延伸率测试分析表明和再结晶晶粒尺寸，材料经过大塑性变形后性能得到了极大的改善；对经过不同真应变挤压后的触点测试，发现触点的质量损耗减小。

英文摘要：

The Ag/SnO2 composites were prepared by reactive synthesis and the microstructure uniformity and performance variation of Ag/SnO2 composites in the severe plastic deformation were investigated. The SEM analysis shows that with increasing of true strain, the fiber like microstructure vanishes gradually, and the distribution of SnO2 particles changes from cluster like to uniform. The test results of electrical and mechanical performances as well as grain sizes indicate that the performances of the Ag/SnO2 composites by severe plastic deformation are improved greatly, their mass loss of the contacts via larger true strain extrusion decreases obviously.