This study revealed the nucleation event and grain refinement mechanism of Mg–Al alloy induced by Fe impurity. The following orientation relationship was observed between Al–Fe particle and α-Mg matrix in the Mg–3Al alloy containing Fe impurity using a focused ion beam aided transmission electron microscope technique: ((1)011)[01(1)1]Mg//(01(1))[011]Al2Fe . Mg–3Al alloy was inoculated by adding 0.02wt％ Fe to verify the nucleating potency of the Al2Fe phase for α-Mg grain. The results indicated that Mg–3Al alloy was effectively refined with an av-erage grain size declining from 1135 to 540 μm. Among the potential Al–Fe phases of Mg–3Al–0.02Fe alloy, only the precipitation of the Al2Fe phase occurs earlier than that of α-Mg grain, and the Al2Fe phase is stable in the nucleation stage of α-Mg grain. Therefore, the Al2Fe particle is the only available nucleating site for Mg–Al alloy with Fe impurity. The heterogeneous nucleation event of α-Mg grain on the Al2Fe particle is responsible for the grain refinement of Mg–3Al alloy inoculated by Fe.

Hengbin Liao;Liling Mo;Xiong Zhou;Zhizhong Yuan;Jun Du

School of Materials Science and Engineering,South China University of Technology,Guangzhou 510640,China;School of Materials Science and Engineering,Jiangsu University,Zhenjiang 212013,China

矿物冶金与材料学报

[1]Hengbin Liao;Liling Mo;Xiong Zhou;Zhizhong Yuan;Jun Du-.Revealing the nucleation event of Mg–Al alloy induced by Fe impurity)[J].矿物冶金与材料学报,2022(07):1317-1321

Al2Fe,02Fe

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