Grain Coarsening Behavior of Mg-Al Alloys with Mischmetal Addition

Small addition of mischmetal （MM） into aluminum alloys can lead to grain refinement. However, it is still uncertain whether the same effect applies to Mg-Al alloys. This work indicated that small amount of mischmetal addition ranging from 0.1% to 1.2% （mass fraction） did not cause grain refinement i...

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Bibliographic Details
Published in:Journal of rare earths 2007-04, Vol.25 (2), p.227-232
Main Author: 李双寿 郑伟超 汤彬 曾大本 郭旭涛
Format: Article
Language:English
Subjects:
grain coarsening
Mg-Al alloys
mischmetal
rare earths
晶粒粗化
混合稀土金属
添加剂
镁铝合金
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Summary:Small addition of mischmetal （MM） into aluminum alloys can lead to grain refinement. However, it is still uncertain whether the same effect applies to Mg-Al alloys. This work indicated that small amount of mischmetal addition ranging from 0.1% to 1.2% （mass fraction） did not cause grain refinement in Mg-Al alloys. On the contrary, they tended to coarsen the grains. When added into Mg-Al alloys, MM reacted preferentially with Al to form Al11 MM3 phase. As Al11 MM3 phase mainly distributed within α-Mg grains than at grain boundaries, it had little effect in restricting grain growth. In addition, MM reacted with Al8（Mn, Fe）5 or ε-AlMn particles to form Al-MM-Mn compounds, thus it reduced the amount of heterogeneous nuclei in the melt and resulted in remarkable grain coarsening.
ISSN:1002-0721
2509-4963
DOI:10.1016/S1002-0721(07)60078-7