Ageing characteristics and microstructure of Al-4Mg-1.5Cu alloys containing silver and lithium

来源期刊：中国有色金属学报(英文版)2003年第6期

论文作者：陈志国 郑子樵 王芝秀

文章页码：1290 - 1295

Key words：Al alloy; ageing; microstructure; lithium; silver

Abstract: The ageing behavior and microstructures of the Al-4Mg-1.5Cu alloys containing silver and lithium have been studied. The results show that the effect of Li is to increase the rate of hardening, however, lithium additions in the range of 0 to 2.0% does not progressively change age hardening and precipitation process in the alloy of Al-4.0Mg-1.5Cu-0.4Ag-0.12Zr aged at 200℃, and significant age hardening and strengthening response only occur with the addition of 2.0%Li. TEM investigation results show that the remarkable increase of age hardness and strength is attributed to the fine dispersion of δ′, Z phase and spherical Al₃Zr/Al₃Li compound particles in the 2.0%Li-containing alloy.