Microstructure evolution of Mg–14% Li–1% Al alloy during the process of equal channel angular pressing
Microstructure evolution of Mg–14% Li–1% Al alloy during the process of equal channel angular pressing
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DOI：
10.1016/j.msea.2007.01.108
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发表时间：
2007-07
期刊：
影响因子：
6.4
通讯作者：
T. Liu;Suxiang Wu;Shuzhi Li;Peijie Li
中科院分区：
文献类型：
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作者：
T. Liu;Suxiang Wu;Shuzhi Li;Peijie Li
采用常规挤压和室温等径角挤压法制备了Mg-14% Li-1%超轻铝合金。通过透射电镜观察了合金在ECAP处理过程中的组织演变。结果表明：基体β相晶粒明显细化，晶粒平均尺寸从60μm减小到200nm；ECAP处理均匀化了α相嵌套在β晶粒中的分布以及与α相共存的三元mglial2相的分布。x射线衍射（XRD）分析和透射电镜（TEM）观察证实了mglial2相的存在。
The super-light Mg–14% Li–1% Al alloy was produced and processed by conventional extrusion at 573K and further by equal channel angular pressing (ECAP) at room temperature (RT). The microstructure evolution of the alloy during the ECAP treatment was investigated by transmission electron microscope (TEM). The results showed that the grains of the matrix β phase were substantially refined, with the mean size decreasing from 60μm to 200nm. The distribution of the α precipitates, which were embedded in the β grains, and the ternary MgLiAl2phase coexisting with the α precipitates was homogenized by ECAP processing. The existence of the MgLiAl2phase was consolidated by both X-ray diffraction (XRD) analyses and TEM observations.