变质元素Sb对Al-Si共晶合金熔体结构的影响

• 作 者: 王伟民 边秀房 秦敬玉
• 机 构: 山东工业大学,山东工业大学,山东工业大学
• 出 处: 材料研究学报
• 发表日期: 1999年01期
• 关键词: 共晶合金 熔体结构 Al-Si Sb 液态金属 Al－12．5％Si X射线衍射 液态结构 过冷度 径向分布函数

用液态金属X射线衍射仪研究了合金Al＋12．5％Si和Al＋12．5％Si＋0．2Sb的液态结构，发现加Sb后合金熔体的结构因子曲线的第一峰高度比未加Sb时低，在小Q处出现了预峰，合金熔体的配位数在加Sb后有所下降；合金熔体径向分布函数Gauss分解后，0．39nm处的Si－Si峰加Sb后增强；DSC分析表明加Sb后的凝固过冷度减小．这些结果说明Sb增强了合金中Si原子的有序性．

The liquid structure of Al + 12.5% ​​Si and Al + 12.5% ​​Si + 0.2Sb alloy was studied by liquid metal X-ray diffractometer. It was found that the first peak height of the structure factor curve of Sb- The pre-peak appears at the small Q, and the coordination number of the alloy melt decreases after the addition of Sb. After the Gauss decomposition of the radial distribution function of the melt, the Si-Si peak at 0.39 nm is enhanced with Sb, and the DSC Analysis shows that the addition of Sb after the solidification undercooling decreases. These results show that Sb enhances the ordering of Si atoms in the alloy.