Effect of addition temperature on dispersion behavior and grain refinement efficiency of MgO introduced into Mg alloy

IF 4.7 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Transactions of Nonferrous Metals Society of China Pub Date : 2024-08-01 DOI:10.1016/S1003-6326(24)66555-6

Le ZAI , Xin TONG , Yun WANG , Xiao-huai XUE

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Abstract

The effect of addition temperature of MgO particles (MgO_p) on their dispersion behavior and the efficiency of grain refinement in AZ31 Mg alloy was investigated. In addition, the grain refinement mechanism was systematically studied by microstructure characterization, thermodynamic calculation, and analysis of solidification curves. The results show that the grain size of AZ31 Mg alloy initially decreases and then increases as the MgO_p addition temperature is increased from 720 to 810 °C, exhibiting a minimum value of 136 μm at 780 °C. The improved grain refinement efficiency with increasing MgO_p addition temperature can be attributed to the reduced Mg melt viscosity and enhanced wettability between MgO_p and Mg melt. Furthermore, a corresponding physical model describing the solidification behavior and grain refinement mechanism was proposed.

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添加温度对镁合金中引入氧化镁的分散行为和晶粒细化效率的影响

研究了氧化镁颗粒（MgOp）的添加温度对其在 AZ31 镁合金中的分散行为和晶粒细化效率的影响。此外，还通过显微组织表征、热力学计算和凝固曲线分析系统地研究了晶粒细化机理。结果表明，随着 MgOp 添加温度从 720 ℃ 升高到 810 ℃，AZ31 Mg 合金的晶粒尺寸先减小后增大，在 780 ℃ 时晶粒尺寸最小值为 136 μm。晶粒细化效率随着 MgOp 添加温度的升高而提高，这可能是由于镁熔体粘度降低以及 MgOp 与镁熔体之间的润湿性增强所致。此外，还提出了描述凝固行为和晶粒细化机制的相应物理模型。

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来源期刊

Transactions of Nonferrous Metals Society of China 工程技术-冶金工程

CiteScore

7.40

自引率

17.80%

发文量

8456

审稿时长

3.6 months

期刊介绍： The Transactions of Nonferrous Metals Society of China (Trans. Nonferrous Met. Soc. China), founded in 1991 and sponsored by The Nonferrous Metals Society of China, is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology, including mineral processing, extraction metallurgy, metallic materials and heat treatments, metal working, physical metallurgy, powder metallurgy, with the emphasis on fundamental science. It is the unique preeminent publication in English for scientists, engineers, under/post-graduates on the field of nonferrous metals industry. This journal is covered by many famous abstract/index systems and databases such as SCI Expanded, Ei Compendex Plus, INSPEC, CA, METADEX, AJ and JICST.