摘要
The effects of external fields such as electromagnetic field on the structure and heat treatment behavior of Mg-Li-Al alloys were studied.Mg-8Li-3Al alloys cast with and without electromagnetic stirring were used for solution treatment and aging treatment. Experimental results show that the dendritic arms are broken and a large quantity of equiaxed grains appear in the microstructure of specimens with electromagnetic stirring(EMS).With the increase of the quenching temperature(150-350℃),the solution of Mg and Al in solidβphase increases,and the Brinell hardness of the alloy increases as well.Aging peak and over aging happen becauseθ(MgLi_2Al) which precipitates in theβmatrix and strengthens the alloy is unstable and transforms to stable AlLi phase.Aging curves of EMS specimens change in a smaller amplitude.
The effects of external fields such as electromagnetic field on the structure and heat treatment behavior of Mg-Li-Al alloys were studied. Mg-8Li-3Al alloys cast with and without electromagnetic stirring were used for solution treatment and aging treatment. Experimental results show that the dendritic arms are broken and a large quantity of equiaxed grains appear in the microstructure of specimens with electromagnetic stirring （EMS）. With the increase of the quenching temperature（150-350℃）, the solution of Mg and Al in solid β phase increases, and the Brinell hardness of the alloy increases as well. Aging peak and over aging happen because θ（MgLi2Al） which precipitates in the fl matrix and strengthens the alloy is unstable and transforms to stable AlLi phase. Aging curves of EMS specimens change in a smaller amplitude.
出处
《中国有色金属学会会刊：英文版》
CSCD
2008年第A01期96-100,共5页
Transactions of Nonferrous Metals Society of China
基金
Project(107031)supported by the Key Grant of Science & Technology of the Ministry of Education of China
关键词
MG-LI-AL合金
热处理
磁搅拌
焊接
温度梯度
Mg-Li-Al alloys
electromagnetic stirring （EMS）
solution treatment
artificial aging
hardness
