Experimental investigation and simulation assessment on fluidity and hot tearing susceptibility of Al-Li-Cu-X alloy: The role of microalloying elements

IF 4.8 2区 材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING
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Abstract

The meticulous exploration of castability, especially the fluidity and hot tearing susceptibility (HTS), assumes paramount significance in the fabrication of high-quality Al-Li-Cu alloys. In this work, the effect of microalloying elements such as Ti, Mg, Si, Zr, and Sc on the fluidity and HTS of the alloys was systematically investigated, and the significant improvement in fluidity and the reduction in HTS by the addition of these microalloying elements were identified. Comparative analyses with the Al-3Li-1.5Cu alloy reveal a significant increase of up to 45 % in fluidity and a remarkable reduction of up to 83 % in HTS with the addition of these microalloying elements. To unveil the underlying mechanisms, the experimental results were compared with the predictions derived from the CSC criterion, Kou's criterion, and a numerical simulation performed using ProCAST software. The analysis reveals a discrepancy between these predictions and the experimental outcomes, highlighting their limitations in capturing the nuanced effects of minor microalloying elements on fluidity and HTS. Subsequently, a detailed exploration of other influencing factors, including microstructural features, solidification interval, and various thermophysical parameters, was conducted, illuminating the corresponding mechanisms. These findings are expected to provide valuable insights into the fluidity and HTS of Al-Li-Cu-X alloys, thereby contributing to the application and advancement of cast Al-Li alloys.
对 Al-Li-Cu-X 合金流动性和热撕裂敏感性的实验研究和模拟评估:微合金元素的作用
对铸造性,尤其是流动性和热撕裂敏感性(HTS)进行细致的研究,对于制造高质量的铝-锂-铜合金具有极其重要的意义。在这项工作中,系统地研究了 Ti、Mg、Si、Zr 和 Sc 等微合金元素对合金流动性和 HTS 的影响,并确定了添加这些微合金元素后流动性的显著改善和 HTS 的降低。与 Al-3Li-1.5Cu 合金的对比分析表明,添加这些微合金元素后,流动性显著提高了 45%,HTS 显著降低了 83%。为了揭示潜在的机理,我们将实验结果与根据 CSC 标准、Kou 标准和使用 ProCAST 软件进行的数值模拟得出的预测结果进行了比较。分析表明,这些预测与实验结果之间存在差异,凸显了它们在捕捉微小微合金元素对流动性和 HTS 的细微影响方面的局限性。随后,对其他影响因素(包括微结构特征、凝固间隔和各种热物理参数)进行了详细探讨,揭示了相应的机制。这些发现有望为 Al-Li-Cu-X 合金的流动性和 HTS 提供有价值的见解,从而促进铸造 Al-Li 合金的应用和发展。
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来源期刊
Materials Characterization
Materials Characterization 工程技术-材料科学:表征与测试
CiteScore
7.60
自引率
8.50%
发文量
746
审稿时长
36 days
期刊介绍: Materials Characterization features original articles and state-of-the-art reviews on theoretical and practical aspects of the structure and behaviour of materials. The Journal focuses on all characterization techniques, including all forms of microscopy (light, electron, acoustic, etc.,) and analysis (especially microanalysis and surface analytical techniques). Developments in both this wide range of techniques and their application to the quantification of the microstructure of materials are essential facets of the Journal. The Journal provides the Materials Scientist/Engineer with up-to-date information on many types of materials with an underlying theme of explaining the behavior of materials using novel approaches. Materials covered by the journal include: Metals & Alloys Ceramics Nanomaterials Biomedical materials Optical materials Composites Natural Materials.
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