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2197铝锂合金形变热处理中T1相的析出行为
发布人：上海艾荔艾金属材料有限公司www.shailiai.com
更新时间：2015-09-28
对2197铝锂合金进行形变热处理，采用HREM高分辨电镜观察合金欠时效和峰时效两个阶段的显微组织，研究T1相析出长大行为及其界面特征。
2197铝锂合金形变热处理中T1相的析出行为Precipitation behavior of T1 phase duringthermo-mechanical treatment of 2197 Al-Li alloy
对2197铝锂合金进行形变热处理，采用HREM高分辨电镜观察合金欠时效和峰时效两个阶段的显微组织，研究T1相析出长大行为及其界面特征。结果表明：形变热处理2197合金在欠时效阶段主要存在δ′、θ′和T1相，T1相尺寸约为40 nm；峰时效阶段合金中δ′和θ′数量减少，主要析出相为T1相，其尺寸为50~150 nm，T1相可通过δ′相的溶解而长大。在欠时效和峰时效两阶段，T1相末端与基体共格，其他区域与基体非共格。T1相为六方晶系，与基体存在惯析关系：(0001)T1//(111)A1、[1010]T1//[110]A1，惯析面为{111}A1。
2197 Al-Li alloy was thermo-mechanically treated, and the precipitation and growth of the T1 phase and the phase interface characteristics were studied. The microstructures of thermo-mechanical treated 2197 Al-Li alloy for under-aged and peak-aged states were observed by high resolution electron microscopy (HREM). The results show that during thermo-mechanical treatment, δ′, θ′ and T1 phases are the main phases of under-aged 2197 alloy, the size of T1 phase is about 40 nm. δ′ and θ′ phases number reduce at peak-aged state, while the main phase of peak-aged 2197 alloy is T1 phase with the size of 50-150 nm. The T1 phase grows up by the dissolving of δ′ phase. The end of T1 phase of peak-aged 2197 alloy is coherent with the matrix while the rest is non-coherent during under-aged and peak-aged states. Habit relationships between T1 phase which is hexagonal crystal system and the matrix is as follow: (0001)T1//(111)A1 and [1010]T1//[110] A1, and the habit plane is {111}A1.
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