单/双尺寸SiCp对AZ91D镁合金组织和性能的影响  

Effects of Single/Double Size SiC_p on Microstructure and Properties of AZ91D Alloy

作　　者：马振星 游志勇[1] 蒋傲雪 于杰 王彬 Ma Zhenxing;You Zhiyong;Jiang Aoxue;Yu Jie;Wang Bin(School of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024)

机构地区：[1]太原理工大学材料科学与工程学院,太原030024

出　　处：《特种铸造及有色合金》2024年第4期495-499,共5页Special Casting & Nonferrous Alloys

摘　　要：以AZ91D镁合金和平均颗粒尺寸为10μm和10 nm的SiC颗粒分别作为基体和增强相,通过半固态机械搅拌法制备出单、双尺寸SiC颗粒增强镁基复合材料。结果显示,SiCp体积分数为2%的10 nm SiCp/AZ91D复合材料的抗拉强度达到198 MPa,提升了34.7%,屈服强度达到113 MPa,提升了46.7%,伸长率达到6.4%,这主要由于纳米SiC颗粒的晶粒细化作用。断裂机制表明,SiCp/AZ91D复合材料裂纹主要沿微米SiCp-AZ91D的界面扩展。Taking AZ91D magnesium alloy as matrix and SiC particles with an average particle size of 10 μm and 10 nm as reinforcing phases, single-and double-size SiC particle-reinforced magnesium matrix composites were prepared by semi-solid state mechanical stirring method. The results reveal that the 2% SiCp/AZ91D composites with particle size of 10 nm achieve a tensile strength of 198 MPa and yield strength of 113 MPa, which is increased by 34.7% and 46.7%,respectively, and elongation reaches 6.4%, which is mainly attributed to the grain refinement effect of nano SiC particles. The fracture mechanism indicates that the cracks in the SiCp/AZ91D composite mainly propagate along the interface of micron SiCp-AZ91D.

关 键 词：SIC AZ91D镁合金 微观组织 力学性能 断裂机制 

分 类 号：TB331[一般工业技术—材料科学与工程] TG146.22[金属学及工艺—金属材料]