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采用扫描电镜、X射线衍射分析仪、单轴拉伸等方法研究了搅拌熔铸法制备的1wt%SiCP/Mg-5Gd-1Y-1Nd-0.25Zr复合材料的显微组织与力学性能。结果表明:该复合材料中存在Mg2Si、Mg3Gd和Mg12Nd等多种物相;添加1wt%SiC颗粒,能将基体合金的弹性模量提高5～8GPa,但降低了合金强度;弹性模量的提高应主要归因于高弹性模量的SiC粒子、Mg2Si及稀土化合物;强度的降低主要是由于界面产物、氧化物等降低了界面结合强度;晶内稀土含量减少,析出强化减弱,基体强度下降。
The microstructure and mechanical properties of 1wt% SiCP / Mg-5Gd-1Y-1Nd-0.25Zr composites prepared by stirring casting process were investigated by scanning electron microscopy, X-ray diffraction analysis and uniaxial stretching. The results show that Mg2Si, Mg3Gd and Mg12Nd phases exist in the composites. Adding 1wt% SiC particles can increase the elastic modulus of the matrix alloy by 5 ~ 8GPa, but decrease the strength of the alloy. The increase of elastic modulus Mainly due to the high elastic modulus of SiC particles, Mg2Si and rare earth compounds; strength reduction is mainly due to interfacial products, oxides and lower interfacial bonding strength; intragranular rare earth content decreased precipitation precipitation decreased, the matrix strength decreased.