Relationship between characteristics of liquid film and hot tearing phenomena during solidification of hypereutectic Al-Si alloy

IF 3.5 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Rui Zhou, Xiaogang Fang, Kaixuan Zhang, Junchao Yu, Chao Gao, Yiqing Chen
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引用次数: 0

Abstract

The alloy in the final stage of solidification is in the semi-solid region, composed of solid grains and liquid film. This article focuses on the effect of liquid film on hot tearing in the final stage of solidification. It investigates the mechanism of the effect of liquid film on the initiation of hot tearing. The mechanical behavior of Al-27%Si hypereutectic Al-Si alloy in high-temperature stress–strain testing was studied. The results showed that the overall content of the liquid film during the solidification process affects the mechanical properties of the alloy; the alloy exhibited viscoelasticity in a high solid fraction state and viscoplasticity in a low solid fraction state. At the same time, a Si-liquid film-Si structure was constructed to simulate the intergranular liquid film structure of hypereutectic Al-Si alloy in the final stage of solidification. The stress variation characteristics of the intergranular liquid film showed that the smaller the liquid film thickness, the stronger the interaction force between Si wafers, which is not conducive to improving the liquid film fluidity. In addition, the fracture morphology of the tensile fracture was observed, and it was found that under the condition of thick liquid film, the flowability of the residual liquid phase was better, making it easier to feed for hot tearing. Finally, CFD simulation technology was used to study the mechanism of the effect of a single factor of liquid film characteristics on hot tearing. The results showed that the thicker the liquid film, the greater its ability to feed and heal the formed hot tearing, thus effectively reducing the alloy's tendency toward hot tearing.

过共晶Al-Si合金凝固液膜特性与热撕裂现象的关系
合金在凝固的最后阶段处于半固态区,由固态晶粒和液膜组成。本文着重研究了凝固最后阶段液膜对热撕裂的影响。探讨了液膜对热撕裂起裂作用的机理。研究了Al-27%Si过共晶Al-Si合金在高温应力应变试验中的力学行为。结果表明:凝固过程中液膜的总体含量影响合金的力学性能;合金在高固相分数状态下表现为粘弹性,在低固相分数状态下表现为粘塑性。同时,构建了si -液膜- si组织,模拟了过共晶Al-Si合金凝固最后阶段的晶间液膜组织。晶间液膜的应力变化特征表明,液膜厚度越小,硅片之间的相互作用力越强,不利于液膜流动性的提高。此外,对拉伸断口的断口形貌进行了观察,发现在液膜较厚的条件下,残余液相的流动性更好,更容易供热撕裂。最后,利用CFD模拟技术研究了液膜特性单因素对热撕裂的影响机理。结果表明,液膜越厚,其供给和修复形成的热撕裂的能力越强,从而有效降低了合金的热撕裂倾向。
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
Journal of Materials Science
Journal of Materials Science 工程技术-材料科学:综合
CiteScore
7.90
自引率
4.40%
发文量
1297
审稿时长
2.4 months
期刊介绍: The Journal of Materials Science publishes reviews, full-length papers, and short Communications recording original research results on, or techniques for studying the relationship between structure, properties, and uses of materials. The subjects are seen from international and interdisciplinary perspectives covering areas including metals, ceramics, glasses, polymers, electrical materials, composite materials, fibers, nanostructured materials, nanocomposites, and biological and biomedical materials. The Journal of Materials Science is now firmly established as the leading source of primary communication for scientists investigating the structure and properties of all engineering materials.
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