Effect of magnetic stirring, grain modification and refinement on the solidification structure of an A356 aluminum alloy

IF 0.5 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY
Ó. Bustos, R. Allende, R. Leiva, C. Sánchez
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引用次数: 3

Abstract

The effect of the application of forced convection during the continuous solidification of Al-Si alloys has been presented in this work. The investigation has been made on the hypothesis that as an alloy solidifies under the action of a rotating magnetic field, a nondendritic casting structure would be obtained. The Al-Si alloy has been studied in its three different states (original, modified, and modified with a grain refiner), using a magnetic stirring equipment with permanent magnets, a device that has allowed the study of the effect of the rotational speed (degree of stirring) on the micro- and macro- solidification structure, as well as on the material’s mechanical properties. With the purpose of validating the hypothesis, different analyses and tests have been carried out, such as thermal analysis of the solidification process, micro- and macrostructural analysis, and hardness measurements for the different process conditions studied. The results have shown that magnetic stirring affects the cooling curves, expanding the solidification range. A microstructural evolution of the alloys has also been observed, from a 100% dendritic structure to a mature rosette type structure, in addition to a notable decreasing of grain size, which results in the improvement of the material’s mechanical behavior. Keywords: Grain Refinement, forced convection, solidification, Al-Si.
磁搅拌、晶粒改性和细化对A356铝合金凝固组织的影响
本文介绍了强制对流在铝硅合金连续凝固过程中的应用效果。本研究假设合金在旋转磁场作用下凝固,可获得非枝晶铸造组织。采用永磁体磁搅拌设备,研究了Al-Si合金的三种不同状态(原始状态、改性状态和晶粒细化剂改性状态),该设备可以研究转速(搅拌程度)对微观和宏观凝固组织以及材料力学性能的影响。为了验证这一假设,对所研究的不同工艺条件进行了不同的分析和试验,如凝固过程的热分析、微观和宏观组织分析以及硬度测量。结果表明,磁搅拌影响冷却曲线,扩大了凝固范围。合金的显微组织也发生了变化,从100%的枝晶组织到成熟的玫瑰型组织,晶粒尺寸明显减小,从而提高了材料的力学性能。关键词:晶粒细化,强制对流,凝固,Al-Si
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Materia-rio De Janeiro
Materia-rio De Janeiro MATERIALS SCIENCE, MULTIDISCIPLINARY-
CiteScore
1.00
自引率
25.00%
发文量
51
审稿时长
6 weeks
期刊介绍: All the articles are submitted to a careful peer-reviewing evaluation process by the journal''s Editorial Board. The Editorial Board, reviewers and authors make use of a web based proprietary automated tool to deal with the reviewing procedures.the Revista Matéria''s article reviewing restricted access system - SEER. Authors are not informed about the identity of the reviewers.
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