【摘要】 采用放电等离子体烧结(spark plasma sintering,SPS)技术制备了含质量分数为0%、0.5%、1.0%、2.0%和5.0%的纳米SiC颗粒(SiC_p,平均粒径为40 nm)增强铝镁复合材料,通过扫描电镜(scanning electron microscope,SEM)观察铝镁复合材料微观组织形貌,并对复合材料进行了力学性能测试,研究了不同质量分数纳米SiC_p对复合材料相对密度和力学性能的影响规律,确定了制备复合材料最佳SiCp添加量。研究表明:随着纳米SiC_p质量分数的增加,复合材料的硬度逐渐增加,抗拉强度呈现先增加后降低的变化趋势,质量分数为1.0%的SiC_p增强铝镁复合材料的性能最好,相对密度和抗拉强度分别达到了98.36%和301.5 MPa。更多还原

【Abstract】 The Al–Mg composites reinforced by nano-SiC particles(SiC_p,average particle size 40 nm) in different particle contents of 0%,0.5%,1.0%,2.0%,and 5.0% by mass were prepared by spark plasma sintering(SPS) in this paper.The microstructures of nano-SiC_p reinforced Al–Mg composites(SiC_p/Al–Mg) were observed by scanning electron microscope(SEM),the mechanical properties of the composites were tested,and the optimum SiC_p content was defined.The results show that,the composite hardness increases with the increase of the nano-SiC_p content,the tensile strength increases first and then decreases.The SiC_p/Al–Mg composites with 1.0% nano-SiC_p show the best performance,the relative density and tensile strength reaches 98.36% and 301.5 MPa,respectively.更多还原