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以Mg-6Al-1Ca-1Nd合金为研究对象,通过重力铸造和离心铸造制备出Mg-6Al-1Ca-1Nd合金试样,运用光学金相分析(OM)、扫描电子显微分析(SEM)、X射线衍射分析(XRD)、硬度测试等多种分析和测试手段,系统研究了重力铸造和离心转速对Mg-6Al-1Ca-1Nd合金组织及力学性能的影响。结果表明,与重力铸造试样相比,离心铸造Mg-6Al-1Ca-1Nd镁合金的晶粒得到了显著的细化,并且离心铸造试样为等轴晶。随着离心转速增加,合金的晶粒尺寸减小。XRD分析表明,离心铸造镁合金试样的中间相为Mg17Al12、Al2Nd和Al2Ca;而重力铸造试样中没有发现Al2Ca相的衍射峰,Mg17Al12和Al2Nd的衍射峰比较弱。硬度随离心转速增加而持续增加,离心速度为1541r/min时,硬度(HV)达到最大,为58.5。
The samples of Mg-6Al-1Ca-1Nd alloy were prepared by gravity casting and centrifugal casting using Mg-6Al-1Ca-1Nd alloy as the research object. Optical and metallographic analysis (OM), scanning electron microscopy X-ray diffraction (XRD), hardness test and other analysis and test methods, the effects of gravity casting and centrifugal speed on the microstructure and mechanical properties of Mg-6Al-1Ca-1Nd alloy were studied systematically. The results show that compared with the gravity casting samples, the centrifugal casting of Mg-6Al-1Ca-1Nd magnesium alloy grains have been significantly refined, and the centrifugal casting sample is equiaxed. As the centrifuge speed increases, the grain size of the alloy decreases. The XRD results showed that the mesophases of the centrifugal casting magnesium alloy were Mg17Al12, Al2Nd and Al2Ca. The diffraction peaks of Al2Ca phase were not found in the gravity casting samples, but the diffraction peaks of Mg17Al12 and Al2Nd were weaker. The hardness increases continuously with the increase of centrifugal speed. The maximum hardness (HV) reaches 58.5 at the centrifugal speed of 1541r / min.