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采用金相显微镜(OM)、扫描电镜(SEM)及其附带的能谱仪(EDS)和拉伸试验等技术研究了经搅拌铸造与真空重熔铸锭-挤压制备的Mg-Gd-Y-Nd/SiCP复合材料的显微组织与力学性能。结果表明,搅拌铸造法制备的铸锭经真空重熔凝固后,晶粒粗大,SiCP重新聚集,有利于排出搅拌铸造吸入的气体,这些组织特征对后续挤压棒材具有冶金遗传影响,使挤压棒获得更高强度。但较大的晶粒与第二相纤维组织降低了伸长率。SiCP颗粒会与Gd、Y元素反应生成REmSin相,但其不足以弥补因此而损失的Gd、Y元素的析出相强化,以及SiCP对杨氏模量的增强效果。
The microstructures of Mg-Gd-Y-Zr alloy prepared by stirring casting and vacuum remelting ingot-extrusion were investigated by OM, SEM and EDS (energy dispersive spectroscopy) Microstructure and Mechanical Properties of Nd / SiCP Composites. The results show that the ingot prepared by stirring casting process is solidified by vacuum remelting, the grains are coarse and the SiCP is reagglomerated, which is beneficial to discharge the gas sucked in by stirring casting. The characteristics of these microstructures have the metallurgical genetic influence on the subsequent extruded bar, Pressure bar to obtain higher strength. However, the larger grains and the second phase of the fiber structure reduce the elongation. SiCP particles react with Gd and Y elements to form REmSin phase, but they are not enough to compensate for the loss of Gd and precipitation of Y elements and the enhancement effect of SiCP on Young's modulus.