采用反应合成法制备Ag-CeO2复合材料,研究了Ag-CeO2复合材料的物相,在大塑性变形加工条件下的组织均匀化过程,以及Ag-CeO2复合材料的显微组织和物理性能的演变.XRD、SEM及能谱分析结果表明:通过反应合成法可以在Ag基体中合成尺寸细小的Ag-CeO2复合材料,其显微组织为Ag基体中分布着细小CeO2颗粒的团聚物. 经过累积大塑性变形加工能够对Ag-CeO2复合材料的显微组织起到均匀化和弥散化作用.Ag-CeO2复合材料的抗拉强度、电阻率等随真应变的增加而降低,延伸率随真应变的增加而提高.
In present study, Ag-CeO2 composites was prepared by reaction synthesis processing. The phases, the procedure of microstructure homogenization, and the microstructure and physical property evolution of the Ag-CeO2 composites via the severe plastic deformation were researched extensively. XRD, SEM and EDS analysis indicate that the Ag-CeO2 composites with tiny AgCeO2 clusters forming in the Ag matrix can be obtained by reactive synthesis processing, and the microstructure shows the tiny CeO2 clusters distribute in the Ag matrix which becomes homogenous and dispersed after cumulative severe plastic deformation. The tensile strength and electrical resistivity decrease with the increase of true strain, while the elongation changes contrarily.
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