Effects of Al content on microstructure of as-cast Mg–3·5Ca alloy
Effects of Al content on microstructure of as-cast Mg–3·5Ca alloy
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Al含量对铸态Mg-3·5Ca合金显微组织的影响
DOI：
10.1179/1432891714z.000000000663
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
F. Pan
中科院分区：
文献类型：
--
作者：
Z. Jiang;B. Jiang;Y. Xiao;Y. Tian;G. Zhou;F. Pan
制备了Mg-xAl-3·5Ca（x =0，1，2·5，5和7·5，wt-%）合金，研究了Al含量对Mg-3·5Ca铸态组织的影响。 结果表明，随着Al含量的增加，第二相的演化顺序为Mg 2Ca →（Mg，Al）2Ca→ Al 2Ca + Mg 17 Al 12。添加Al后，合金中沿着枝晶间形成的相的形貌经历了从细颗粒状、片层状到粗骨状的转变过程。这些变化与Al含量和Ca/Al比的增加有关。随着Mg-3·5Ca合金中Al含量的增加，平均晶粒尺寸呈现先减小后增大的趋势，这主要是由于成分过冷以及铸态相分布和形貌的变化所致。
Abstract Mg–xAl–3·5Ca (x = 0, 1, 2·5, 5 and 7·5, wt-%) alloys were prepared, and the effects of Al content on the microstructures of the as cast Mg–3·5Ca were investigated. The results showed that with increasing of the Al content, second phase evolution sequences are Mg2Ca→(Mg,Al)2Ca→Al2Ca+Mg17Al12. And the morphology transformation process of the phases formed along the interdendritic regions in as cast alloys was from a fine granular shape, a lamella type to thick bone with Al addition. These changes associate with an increase in the Al content and the Ca/Al ratio. With increasing of Al content in Mg–3·5Ca alloy, the mean grain size has a trend of first decrease and then increase, which is mainly caused by the constitutional undercooling as well as the changes of the distribution and morphology of the phases at as cast state.
影响因子：
14
作者：
Li, Xiaoming;van Blitterswijk, Clemens A.;Watari, Fumio
通讯作者：
Watari, Fumio