Effect of copper addition on the thermal contraction of indium melt clusters

摘要

The structure of In-1%Cu and In-5%Cu (mass fraction) alloy melts were studied at different temperatures above liquidus by using a high-temperature X-ray diffractometer and were compared with that of pure In melt. Experimental results show that ;.vith the addition of 1% Cu or 5% Cu, the thermal conlraction phenomenon of atom clusters occurs in melts with the texture increasing like pure In melt. With the addition of 1% Cu, the thermal conlraction of atom clusters increases and the conlraction is not homogeneous in the whole measurement temperange. The sudden change and no-ticeable conlraction can be found in the range of 280-390℃. The temperature range of the sudden change is lower than that of pure In melt. With the addition of 5% Cu, the thermal conlraction of atom clusters decreases and the conlraction is not consistent in the whole measurement temperange. The anomalous change can be measured at about 600℃. At the same superheating temperature,the nearest interatomie distance r1 of the melts containing copper is smaller than that of pure In melt, implying that the cluster structure of melts containing copper is more compact.