Controlled preparation of a novel GNP@MgO particles and its refinement mechanism in Mg-9Al alloy

IF 15.8 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Journal of Magnesium and Alloys Pub Date : 2025-04-01 DOI:10.1016/j.jma.2024.01.009

Shuaihu Wei, Xiaojun Wang, Xuejian Li, Hailong Shi, Xiaoshi Hu, Chao Xu

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引用次数: 0

Abstract

The addition of effective nucleating particles in the melt to achieve grain refinement has become the most widely used method for the casting industries. In this study, a novel GNP@MgO particle with a nanocomposite structure was prepared by utilizing an in-situ reaction of the carbon source gas with Mg melt. The results showed that the particles can significantly reduce the average grain size of Mg-9Al alloy from 130.4 µm to 13.1 µm, and achieve an ultra-high grain refinement efficiency of 90%. The refinement mechanisms are that the Al₄C₃ phase can act as a heterogeneous nucleation site for α-Mg grains due to the orientation relationship as (001)_Al4C3//(002)_Mg. Meanwhile, the particle distribution model shows that the velocity of MgO particles is much higher than the growth rate of α-Mg grains. Therefore, it is pushed to the vicinity of grain boundaries during solidification, effectively limiting the growth of α-Mg grains. The remarkable grain refinement effect was achieved through the synergistic modulation of Al₄C₃ and MgO particles. This work may provide new insight into designing high efficiency grain refiners for Mg-Al alloys.

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新型 GNP@MgO 颗粒的可控制备及其在 Mg-9Al 合金中的细化机制

在熔体中添加有效的成核颗粒以实现晶粒细化已成为铸造业最广泛使用的方法。本研究利用碳源气体与镁熔体的原位反应制备了具有纳米复合结构的新型 GNP@MgO 颗粒。结果表明，该颗粒能将 Mg-9Al 合金的平均晶粒尺寸从 130.4 µm 显著减小到 13.1 µm，并实现了 90% 的超高晶粒细化效率。细化机理是由于 Al4C3 相与 (001)Al4C3//(002)Mg 的取向关系，Al4C3 相可作为 α-Mg 晶粒的异质成核点。同时，颗粒分布模型表明，氧化镁颗粒的速度远高于α-镁晶粒的生长速度。因此，它在凝固过程中被推向晶界附近，有效地限制了 α-Mg 晶粒的生长。通过 Al4C3 和 MgO 粒子的协同调制，实现了显著的晶粒细化效果。这项研究为设计镁铝合金的高效晶粒细化器提供了新的思路。

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来源期刊

Journal of Magnesium and Alloys Engineering-Mechanics of Materials

CiteScore

20.20

自引率

14.80%

发文量

审稿时长

59 days

期刊介绍： The Journal of Magnesium and Alloys serves as a global platform for both theoretical and experimental studies in magnesium science and engineering. It welcomes submissions investigating various scientific and engineering factors impacting the metallurgy, processing, microstructure, properties, and applications of magnesium and alloys. The journal covers all aspects of magnesium and alloy research, including raw materials, alloy casting, extrusion and deformation, corrosion and surface treatment, joining and machining, simulation and modeling, microstructure evolution and mechanical properties, new alloy development, magnesium-based composites, bio-materials and energy materials, applications, and recycling.