摘要
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.
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 Al_3Zr/Al_3Li compound particles in the (2.0%Li-)containing alloy.
出处
《中国有色金属学会会刊：英文版》
CSCD
2003年第6期1290-1295,共6页
Transactions of Nonferrous Metals Society of China
基金
Project(0 1JJY2 0 5 8)supportedbytheNaturalScienceFoundationofHunanProvince China
关键词
时效
铝合金
银
锂
显微结构
Al alloy
ageing
microstructure
lithium
silver
