Formation Mechanism and Existing Form of Sb in Heat Resistance Mg-Gd-Y-Sb Alloy  

作　　者：HUANG Yuanchun LUO Xiaoyu LIU Yu XIAO Zhengbing 黄元春;雒晓宇;LIU Yu;XIAO Zhengbing(Light Alloy Research Institute,Central South University,Changsha 410083,China;State Key Laboratory of High Performance ami Complex Manufacturing,Central South University,Changsha 410083,China;School of Material Science and Technology,Central South University,Changsha 410083,China)

机构地区：[1]Light Alloy Research Institute,Central South University,Changsha 410083,China [2]State Key Laboratory of High Performance ami Complex Manufacturing,Central South University,Changsha 410083,China [3]School of Material Science and Technology,Central South University,Changsha 410083,China

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2021年第2期262-268,共7页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the National Natural Science Foundation of China(No.U1837207)。

摘　　要：The existing form and reaction mechanism of Sb in heat resistane Mg-Gd-Y-Sb rare earth magnesium alloy were investigated by inductive coupled plasma emission spectroscopy(ICP),scanning electron microscopy(SEM),energy dispersive spectroscopy(EDS),and X-ray diffraction(XRD).It is found that Sb tends to form high melting point intermetallics with rare earth elements of Gd and Y.The existing form of Sb is determined to be GdSb and SbY,respectively,which has high melting point(GdSb:2142℃/SbY:1782℃).Meanwhile,the first principle calculation and electronegativity difference calculation were performed to further understand the reaction mechanism.Therefore,the forming heat and binding energy were calculated.The experimental results show that the binding tendency of Sb element to Gd and Y is much stronger than that of it with other elements in this alloy,which results in the formation of high melting point of Gd-Sb and Y-Sb intermetallics,and finally leads to the high temperature resistant further improvement of the Mg-Gd-Y magnesium alloy.

关 键 词：Mg-Gd-Y-Sb alloys rare earth elements heat resistance property INTERMETALLICS first-principles calculation 

分 类 号：TG132.3[一般工业技术—材料科学与工程]