Homogenization heat treatment of 2099 Al–Li alloy
来源期刊：Rare Metals2014年第1期
论文作者：Fei Zhang Jian Shen Xiao-Dong Yan Jian-Lin Sun Xiao-Long Sun Yin Yang
文章页码：28 - 36
摘 要：The microstructure evolution and composition distribution of as-cast and homogenized 2099 aluminum– lithium（Al–Li） alloy were studied by optical microscopy（OM）, differential thermal analysis（DTA）, scanning electron microscopy（SEM）, energy dispersive spectrometry（EDS）, area and line scanning, X-ray diffraction（XRD）, and Vickers microhardness test methods. The results show that severe dendrite exists in the as-cast alloy. Cu, Zn, Mn, and Mg distribute unevenly from the grain boundary to inside. The low-melting point nonequilibrium eutectic phases dissolve into the matrix during the first-step homogenization, whereas the melting point of residual eutectic phases is elevated. After the second-step homogenization, most of the remaining eutectic phases dissolve into the matrix, except a small amount of Al–Cu–Fe phases. An optimized homogenization process of the 2099 Al–Li alloy is developed（515 °C 9 18 h ? 525 °C 9 16 h）, which shows a good agreement with the homogenization kinetic analysis results.
Fei Zhang1,2，Jian Shen1，Xiao-Dong Yan1，Jian-Lin Sun2，Xiao-Long Sun1，Yin Yang1
1. Nonferrous Metals Processing Division, General Research Institute for Nonferrous Metals2. School of Materials Science and Engineering, University of Science and Technology Beijing
摘 要：The microstructure evolution and composition distribution of as-cast and homogenized 2099 aluminum– lithium（Al–Li） alloy were studied by optical microscopy（OM）, differential thermal analysis（DTA）, scanning electron microscopy（SEM）, energy dispersive spectrometry（EDS）, area and line scanning, X-ray diffraction（XRD）, and Vickers microhardness test methods. The results show that severe dendrite exists in the as-cast alloy. Cu, Zn, Mn, and Mg distribute unevenly from the grain boundary to inside. The low-melting point nonequilibrium eutectic phases dissolve into the matrix during the first-step homogenization, whereas the melting point of residual eutectic phases is elevated. After the second-step homogenization, most of the remaining eutectic phases dissolve into the matrix, except a small amount of Al–Cu–Fe phases. An optimized homogenization process of the 2099 Al–Li alloy is developed（515 °C 9 18 h ? 525 °C 9 16 h）, which shows a good agreement with the homogenization kinetic analysis results.
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