Effect of trace rare earth element Er on high pure Al
来源期刊：中国有色金属学报(英文版)2003年第5期
论文作者：杨军军 聂祚仁 金头男 徐国富 付静波 阮海琼 左铁镛
文章页码：1035 - 1039
Key words：rare-earth element Er; mechanical properties; recrystallization; Al3Er
Abstract: The influence of trace Er addition on high pure aluminum was studied by mechanical properties measurement，hardness measurement, optical microscope，transmission electron microscope and energy spectrum analysis. The results show that minor Er in the studied alloy exists in the form of Al3Er,only a few of Er in α-Al based solid solution .Primary Al3Er particles formed during solidification were often found at the center of aluminum grains and acted as heterogeneous nucleus, also increased the rate of nucleation, therefore the grain are remarkably refined. Trace Er addition to high pure aluminum is able to increase the mechanical properties of high pure Al, which is caused by fine grain strengthening, substructure strengthening and precipitation strengthening. The recrystallization temperature of Er-doped aluminum increases above 50℃, which is caused by the pinning effect of highly dispersed fine Al3Er precipitates on dislocations and sub-grain boundaries.
