Uncovering the role of hierarchical and heterogeneous structures on strength anisotropy and strain localization of laser power bed fusion AlSi10Mg

IF 5.8 2区 材料科学 Q2 CHEMISTRY, PHYSICAL
Lubin Song, Lv Zhao, Yaxin Zhu, Shuang Liang, Minsheng Huang, Zhenhuan Li
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引用次数: 0

Abstract

Hierarchical and heterogeneous microstructure covers a vague veil on deformation mechanisms and origins of mechanical anisotropy of laser powder bed fusion (LPBF) AlSi10Mg. The present work is devoted to unveil the correlation between microstructure features and mechanical behaviors via high fidelity melt pool models and crystal plasticity finite element simulations. Following careful validation with experimental results, dedicated simulations were conducted to assess the effects of Si-rich network, melt pool border and polycrystalline structures on the mechanical properties, with a particular focus on strength anisotropy and strain localization. The results show that the elongated Si-rich network plays a critical role in strength anisotropy, whereas the melt pool border and grain structure exhibit a negligible influence. Although the softer melt pool border promotes strain localization, its softening effect on global strength is found to be weakened due to deformation compatibility induced constraints, promoting an enhanced strength of this region. Additionally, it is demonstrated that appropriate grain orientation distribution perpendicular to the building direction can effectively reduce the strength anisotropy, without affecting the strain localization level. These findings offer new insights into the microstructure optimization of LPBF aluminum alloys, aiming to achieve mechanical isotropy.
揭示了层次结构和非均质结构对激光功率床熔合AlSi10Mg的强度各向异性和应变局域化的影响
激光粉末床熔合(LPBF) AlSi10Mg的变形机制和力学各向异性的来源,在微观结构上的层次和非均质结构掩盖了一个模糊的面纱。本文通过高保真熔池模型和晶体塑性有限元模拟揭示了微观结构特征与力学行为之间的关系。在对实验结果进行仔细验证后,进行了专门的模拟,以评估富硅网络、熔池边界和多晶结构对力学性能的影响,特别关注强度各向异性和应变局部化。结果表明,拉长的富硅网络对强度各向异性起关键作用,而熔池边界和晶粒结构对强度各向异性的影响可以忽略不计。虽然较软的熔池边界促进了应变局部化,但由于变形相容性诱导的约束,其对整体强度的软化作用减弱,促进了该区域强度的增强。此外,在不影响应变局部化水平的前提下,垂直于建筑方向的适当晶粒取向分布可以有效降低强度各向异性。这些发现为LPBF铝合金的微观结构优化提供了新的见解,旨在实现力学各向同性。
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 Alloys and Compounds
Journal of Alloys and Compounds 工程技术-材料科学:综合
CiteScore
11.10
自引率
14.50%
发文量
5146
审稿时长
67 days
期刊介绍: The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.
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