基于高压扭转法的制备SiCpAl复合材料组织性能研究.doc

文档介绍：
基于高压扭转法的制备 SiCp/Al 复合材料组
织性能研究#
王成国,薛克敏,李萍**
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(合肥工业大学,材料科学与工程学院,合肥 230009)
摘要:在室温条件下采用高压扭转(High Pressure Torsion,HPT)法制备 SiCp/Al 基复合材料。
定性分析了复合材料内部增强颗粒(不同尺寸)的分布。此外,对高压扭转试样进行了显微
硬度测试,室温拉伸实验以及断口 SEM 分析。结果表明,高压扭转法能直接将 SiC 粉末和
Al 粉固结成金属复合材料。通过金相分析得出,高压扭转对不同 SiC 颗粒尺寸的复合材料
均有改善颗粒分布及破碎细化的效果,但颗粒尺寸过大会导致增强颗粒“再生团聚”。对显微
硬度的分析得出,随着增强颗粒尺寸的增大其硬度值逐渐降低。拉伸数据的分析得出,不同
颗粒尺寸的复合材料的极限拉伸强度均高于铸态纯铝,随着增强颗粒尺寸的增大复合材料逐
渐向脆性转变过渡。对断口 SEM 分析得出,SiCp/Al 基复合材料断裂呈现韧性断裂与脆性
断裂的混合模式。
关键词:塑性加工工艺;高压扭转;SiCp/Al 复合材料; 微观组织;拉伸性能
中图分类号:TG379
Study on Preparation and structure Properties by High
Pressure Torsion of SiCp/posites
WANG Chengguo, XUE Kemin, LI Ping
(School of Material Sicence and Engineering, Hefei University of Technology, Hefei 230009)
Abstract: SiCp/Al posites were fabricated by High Pressure Torsion(HPT) method at room
analysised the distribution of the reinforcing particles(different sizes) in the
addition,tested the micro-hardness on the HPT samples,did the tensile experiment at
room temperature and analysised the fracture,s SEM results showed that the HPT method
can directly transform SiC powder and Al powder into a posite metallographic
analysising,concluded that HPT method had a improvement on particle distribution and a
fragmentation thinning effect for posites with different SiC partic