Microstructural formation in a hypereutectic Mg–Si alloy
Microstructural formation in a hypereutectic Mg–Si alloy
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DOI：
10.1016/j.matchar.2005.07.009
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发表时间：
2005-09
影响因子：
4.7
通讯作者：
Yichuan Pan;Xiangfa Liu;Huabing Yang
中科院分区：
文献类型：
--
作者：
Yichuan Pan;Xiangfa Liu;Huabing Yang
利用电子探针研究了铸锭冶金过共晶Mg-8wt.%Si合金的显微组织，并对其凝固过程进行了探讨。该合金的成分为镁硅和镁。合金的凝固组织由三种成分组成：由镁亚初生相包裹的初生枝晶和镁-镁硅共晶。初生镁硅枝晶的二次枝晶间距d2约为17μm，或呈多边形形态，平均尺寸为30μm，镁相以晕的形式包裹在镁硅成分周围。镁-镁硅共晶具有规则的棒状镁硅形态，分布在连续的镁基体中，相间距r约为0.8μm。
In the present work, the microstructure of an ingot metallurgy hypereutectic Mg-8 wt.% Si alloy was studied using electron probe microanalysis (EPMA) and the solidification process was discussed. The components of the alloy are Mg2Si and Mg. The solidified microstructure of the alloy contains three constituents: Mg2Si primary dendrites that are surrounded by Mg sub-primary particles and the Mg–Mg2Si eutectic. The primary Mg2Si dendrites have a secondary dendrite arm spacing d2of approximately 17 μm or show polygonal morphologies with a mean size of 30 μm. An Mg phase appearing as halos surround the Mg2Si constituents. The Mg–Mg2Si eutectic has a regular morphology of rod-like Mg2Si distributed in a continuous matrix of Mg having an interphase spacing r of approximately 0.8 μm.