热挤压变形对Al-Si复合材料组织性能的影响  

Effect of Hot Extrusion Deformation on Microstructure and Mechanical Properties of Al-Si Composite

作　　者：郑晶[1] 王智民[1] 王建军[1] 刘明华[2] 张冀粤[1] 

机构地区：[1]西安理工大学材料科学与工程学院,陕西西安710048 [2]西安建筑科技大学冶金工程学院,陕西西安710055

出　　处：《铸造技术》2006年第8期839-841,共3页Foundry Technology

摘　　要：利用金相显微镜、扫描电镜和万能拉伸试验机考察了用压力熔渗法制备的粒度为50～80μm的Si颗粒增强Al—Si复合材料和将其进行热挤压后的显微组织及室温拉伸性能。结果表明：以17．3：1．0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、屈服强度和伸长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 AI-Si composite reinforced by Si particle with size of 50 μm～80μm before and after hot extrusion were investigated by OM, SEM, and tensile test. The results show thatthe 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.

关 键 词：热挤压变形 Si/Al基复合材料 显微组织 力学性能 

分 类 号：TB331[一般工业技术—材料科学与工程]