Abstract

This paper numerically investigates the stress-strain behavior at the scale of the dendritic structure in an aluminum-silicon alloy additively manufactured by selective laser melting. The stress-strain state in the eutectic phase is studied under the assumption that the continuum mechanics principles are applicable on the scales considered. The averaged characteristics of the eutectic phase are used as input parameters for modeling the deformation of a dendritic structure fragment of a grain, for which significant structural elements are introduced explicitly on each considered scale. It is shown that, on the one hand, the eutectic matrix in dendritic grains of additively manufactured aluminum-silicon alloys inhibits plastic deformation in the dendrite, while on the other it can be a source of stress concentration and microdefect formation already at the early stage of deformation.

中文翻译：

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树状结构尺度下增材制造铝硅合金应力应变行为的数值研究

摘要

本文数值研究了通过选择性激光熔炼添加的铝硅合金中树状结构尺度下的应力-应变行为。在连续力学原理适用于所考虑的尺度的假设下，研究了共晶阶段的应力-应变状态。共晶相的平均特征用作模拟晶粒的树枝状结构片段的变形的输入参数，为此，在每个考虑的尺度上显式引入了重要的结构元素。结果表明，一方面，增材制造的铝硅合金的树枝状晶粒中的共晶基体抑制了枝晶中的塑性变形，