喷射沉积SiC_p/LY12复合材料的性能及超塑性变形

THE PROPERTIES AND SUPERPLASTIC DEFORMATION OF SPRAY-ATOMIZATION AND CO-DEPOSITION SiC_p/LY12 MMCs

研究了喷射沉积10Vol％SiCp／LY12复合材料的组织、强度极限该复合材料经热等静压和等温热正挤压后的超塑性。结果表明：喷射沉积的铝基复合材料经过简单的预处理具有良好的超塑性性能，应变速率敏感性指数m值达0．53，极限延伸率达345％。这与良好的组织状态密切相关。在该复合材料的超塑性变表过程中，空洞的形核与长大一直存在，空洞的长大和连接对材料的断裂有重要的影响。

In the paesent paper, the micrographs and limited strength of 10vol% SiCp/LYl2 spray atomization and co-deposition MMCs are investigated. The superplasticity of this materiaI after HIP and hot extrution is also studied. This spray-atomized material has good superplasticity after pre-treatment and the strain rate sensitivity index m and the limited elongation were found to be 0. 53 and 345%, respectively. The nu-cleation and growing of cavities do exist all the time during the superplasitc deformation and the growing and interlinkage of the cavities have important influence on the fracture of the material.