稀土Er对铸态合金Mg-5Sn组织及晶格常数的影响

Effect of Er-Adding on Microstructure and Lattice Parameter for Mg-5Sn as Cast Alloy

摘要:

本实验借助于XRF、OM、XRD、SEM 等测试方法对铸态合金Mg-5Sn-xEr (x=0, 0.5, 1, 1.5, 2, 2.5, 4, 6, 8, 10 )进行了研究，结果发现稀土Er对合金的晶粒有明显的细化，还可以抑制圆盘状Mg2Sn相的形成，促进不规则形状稀土相的形成，因此稀土Er对铸态Mg-5Sn合金的显微组织及物相有显著影响。本工作通过对合金的衍射谱线进行了全谱拟合，计算了不同合金中的α-Mg固溶体的晶格常数，并在此基础上用 Vegard’ Law分别计算出Er在α-Mg基体中a，c轴方向的的固溶度大小，结果表明在a轴方向的计算结果更为合理

Abstract:

The effects of Er on the microstructures and the lattice parameters of the as cast Mg-5Sn-xEr (x=0, 0.5, 1, 1.5, 2, 4, 6, 8，10) alloys were investigated by X-ray fluorescence(XRF), optical microscopy(OM), X-ray powder diffraction (XRD), Scanning Electron Microscopy (SEM)/Energy Dispersive Spectroscopy (EDS). The addition of Er will result in the grain refinement, inhibite the formation of the phase Mg2Sn, promote the formation of RE-phase with irregular polygon-like shape, so the Er-Adding has obvious effect on Mg-5Sn as cast alloy. The Rietvel whole pattern fitting methods were used to analyze the lattice parameters of α-Mg solid solution in different alloys, on base of it, the Er solubility was calculated with the Vegard’Law on the orientation of a, c axis in α-Mg, respectively, the results show that the calculation of a axis is more reasonable