Fe杂质诱发Mg–Al系合金异质形核

廖恒斌; 莫丽玲; 周雄; 袁志钟; 杜军

doi:10.1007/s12613-021-2406-z

Volume 29 Issue 7

Jul. 2022

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文章导航 > 矿物冶金与材料学报（英文） > 2022 > 29(7): 1317-1321

Hengbin Liao, Liling Mo, Xiong Zhou, Zhizhong Yuan, and Jun Du, Revealing the nucleation event of Mg–Al alloy induced by Fe impurity, Int. J. Miner. Metall. Mater., 29(2022), No. 7, pp. 1317-1321. https://doi.org/10.1007/s12613-021-2406-z

Cite this article as:

Hengbin Liao, Liling Mo, Xiong Zhou, Zhizhong Yuan, and Jun Du, Revealing the nucleation event of Mg–Al alloy induced by Fe impurity, Int. J. Miner. Metall. Mater., 29(2022), No. 7, pp. 1317-1321. https://doi.org/10.1007/s12613-021-2406-z

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研究论文

Fe杂质诱发Mg–Al系合金异质形核

1)
华南理工大学材料科学与工程学院，广州 510640，中国
2)
江苏大学材料科学与工程学院，镇江 212013，中国

通讯作者:
杜军 E-mail: tandujun@sina.com

文章亮点

(1) 发现了Fe杂质元素以Al₂Fe形式存在，与Mg基体之间存在潜在的匹配取向。

(2) 厘清了Fe杂质元素在Mg–3Al合金体系的相析出行为。

(3) 首次提出了Al₂Fe异质形核α-Mg晶粒细化机制。

中文摘要

镁合金具有密度低、比强度高和减震性能优异的特点，是目前最轻的金属结构材料。然而镁合金的绝对强度、塑性成形能力和耐蚀性相对较差，限制了进一步广泛应用。Fe杂质元素会显著降低镁合金的耐蚀性，但是研究表明Fe元素有利于降低Mg–Al系合金的晶粒尺寸，而针对Fe孕育细化Mg晶粒的具体机制尚未明确。本文基于聚焦离子束-透射电子显微镜技术，首次发现Fe杂质元素在Mg–3Al合金中以Al₂Fe颗粒形式存在，并与Mg基体之间存在潜在的匹配取向。为进一步揭示Fe元素对Mg–Al系合金的孕育细化机制，本文引入0.02wt%Fe对Mg–3Al合金进行孕育处理。实验结果表明：经过0.02wt%Fe孕育处理后，Mg–3Al合金的平均晶粒尺寸由1135 μm下降至540 μm。基于JMatPro软件分析可知：Mg–3Al–0.02Fe合金熔体凝固过程中的相析出顺序为：Al₂Fe → α-Mg → Al₅Fe₂ → Al₁₃Fe₄ → Mg₁₇Al₁₂。Fe元素的存在形式为Al–Fe化合物，仅有Al₂Fe先于α-Mg相析出，并在α-Mg凝固初期稳定存在。由此总结并明确提出Fe元素孕育细化机制：对于含Fe杂质元素的Mg–Al系合金，先析出的Al₂Fe颗粒为α-Mg晶粒提供有效的异质形核基底，促使晶粒细化。

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Research Article

Revealing the nucleation event of Mg–Al alloy induced by Fe impurity

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Abstract

Abstract

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: $ \text{(}\bar{\text{1}}\text{011)[01}\bar{\text{1}}\text{1}{\text{]}}_{\text{Mg}}\text{//(01}\bar{\text{1}}\text{)[011}{\text{]}}_{\text{Al}_2\text{Fe}} $. 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 average 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.
- grain refinement;
- Mg–Al alloy;
- Al–Fe particle;
- heterogeneous nucleation

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References

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