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利用高温X射线衍射仪对经电脉冲孕育处理的Al 5%Cu合金液态结构进行表征。结果表明:在经电脉冲孕育处理的熔体中,含Cu的铝团簇数量明显增加,由于相关原子半径和配位数的减小而使这些团簇呈现某种热收缩状态。这种液相结构将使最终的凝固组织中富Cu相更趋于均匀分布。DSC测试表明,经电脉冲孕育处理的液相在结晶过程中,其过冷度是未处理液相的2.36倍。可以确定,电脉冲处理后的Al 5%Cu熔体中原子团簇的变化与先前提出的纯金属电脉冲孕育处理机理模型存在明显差异。
The liquid structure of Al 5% Cu alloy, which was treated by electric pulse, was characterized by high temperature X-ray diffractometer. The results show that the number of aluminum clusters containing Cu significantly increases in the melt prepared by electric pulse, and these clusters show a certain thermal contraction state due to the decrease of related atomic radius and coordination number. This liquid phase structure will make the final solidification of the Cu-rich phase more evenly distributed. The DSC test showed that the supercooling degree of the liquid phase prepared by electric pulse during crystallization was 2.36 times that of the untreated liquid phase. It can be determined that there is a significant difference between the atomic cluster changes in the Al 5% Cu melt after electric pulse treatment and the previously proposed mechanism model of the pure metal electric pulse.