Formation Mechanism and Existing Form of Sb in Heat Resistance Mg-Gd-Y-Sb Alloy
来源期刊：Journal Of Wuhan University Of Technology Materials Science Edition2021年第2期
论文作者：黄元春 雒晓宇 LIU Yu XIAO Zhengbing
文章页码：262 - 268
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:2 142 ℃/SbY:1 782 ℃）.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.
黄元春1,2，雒晓宇1,2，LIU Yu3，XIAO Zhengbing1,2
1. Light Alloy Research Institute, Central South University2. State Key Laboratory of High Performance and Complex Manufacturing, Central South University3. School of Material Science and Technology, Central South University
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:2 142 ℃/SbY:1 782 ℃）.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.
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