Al-6Mg-2Si-0.2Mn合金中微量Bi对Mg2Si共晶改性机理的原子尺度研究

IF 5.6 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Scripta Materialia Pub Date : 2025-09-30 DOI:10.1016/j.scriptamat.2025.117020

Tao Gu , Hai-Long Jia , Min Zha , Pin-Kui Ma , Jia-Wang Song , Yong-Fu Zhu , Hui-Yuan Wang

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引用次数: 0

摘要

Al-Mg-Si亚共晶合金中粗大的、类似汉字的共晶Mg2Si严重降低了延展性，限制了工程应用。本研究表明，在Al-6Mg-2Si-0.2Mn合金中添加微量Bi （0.1 wt.%）可以显著改善合金的拉伸性能。通过先进的原子尺度表征，我们发现这种增强主要源于bi掺杂和Al/Mg2Si界面上独特的多元素（Mn-Fe/Bi-Mn-Fe）偏析行为，该行为显著地将共晶Mg2Si从~ 13.9 μm细化到~ 0.4 μm，并转变为球形形貌。Bi-Mn和Mn-Fe化学键会导致随后的溶质偏析。这些原子尺度的界面修饰共同抑制了Mg2Si的粗化，同时促进了Mg2Si向球形形貌的转变，为通过定向微合金化设计高性能、无需热处理的铝合金提供了新的见解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Atomic-scale insights into the modification mechanism of trace Bi on eutectic Mg2Si in an Al-6Mg-2Si-0.2Mn alloy

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Atomic-scale insights into the modification mechanism of trace Bi on eutectic Mg2Si in an Al-6Mg-2Si-0.2Mn alloy

The coarse and Chinese character-like eutectic Mg₂Si in hypoeutectic Al-Mg-Si alloys severely degrades ductility and restricts engineering applications. This study reveals that trace Bi addition (0.1 wt.%) to an Al-6Mg-2Si-0.2Mn alloy enables significant improvements in tensile properties. Through advanced atomic-scale characterization, we identify that this enhancement primarily originates from Bi-doping and unique multi-element (Mn-Fe/Bi-Mn-Fe) segregation behavior at Al/Mg₂Si interfaces, which dramatically refine the eutectic Mg₂Si from ∼13.9 μm to ∼0.4 μm and transform into a spherical morphology. The Bi-Mn and Mn-Fe chemical bonds will induce the subsequent solute segregation. These atomic-scale interfacial modifications collectively suppress Mg₂Si coarsening while promoting the transformation into a spherical morphology, providing new insights for designing high-performance, heat-treatment-free Al alloys through targeted microalloying.

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来源期刊

Scripta Materialia 工程技术-材料科学：综合

CiteScore

11.40

自引率

5.00%

发文量

581

审稿时长

34 days

期刊介绍： Scripta Materialia is a LETTERS journal of Acta Materialia, providing a forum for the rapid publication of short communications on the relationship between the structure and the properties of inorganic materials. The emphasis is on originality rather than incremental research. Short reports on the development of materials with novel or substantially improved properties are also welcomed. Emphasis is on either the functional or mechanical behavior of metals, ceramics and semiconductors at all length scales.