摘要
利用金相显微镜、扫描电镜和万能拉伸试验机等手段考察了粒度为50～80 μm的Si颗粒增强Al-Si复合材料在热挤压前后的显微组织及室温拉伸性能.结果表明:以17.3:1的挤压比热挤压后复合材料组织的均匀性得到了明显改善;复合材料挤压材的抗拉强度、屈服强度和延伸率较压渗材普遍提高;热挤压没有改变复合材料的断裂机制,由于挤压后颗粒分布均匀等原因,使复合材料的塑性得到改善.
The microstructure and mechanical properties of Al-Si composite reinforced by Si particle with size of 50～80 μm before and after hot extrusion were investigated by OM,SEM,and tensile test.The results show that the microstructure of the composite after hot extrusion with the extrusion ratio of 17.3∶1 becomes more uniformly,and compared with the microstructure characteristic of nearly free dislocation before hot extrusion,more dislocations are found in the microstructure.The ultimate strength,yield strength and elongation of the composite are also increased after hot extrusion.The hot extrusion do not change the fracture mechanism of the composite and the plasticity is improved due to the evenly distributed particles after hot extrusion.
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2006年第z2期133-136,共4页
Chinese Journal of Rare Metals
关键词
热挤压变形
Si/Al
金属基复合材料
显微组织
力学性能
hot extrusion deformation
Al/Si
metal matrix composite
microstructure
mechanical properties
