Microstructure and constitutive model for flow behavior of AlSi10Mg by Selective Laser Melting

Shi Dai, Zi Chen Deng, Ya Jun Yu, Kai Yang Zhu

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13 引用 (Scopus)

摘要

This work is devoted to investigate the flow behavior and microstructure evolution of AlSi10Mg by additive manufacturing in hot deformation. Tensile test is carried out under different temperatures, i.e. 200C, 250C, 300C, 350C and 400C, with various strain rates of 0.004/s, 0.002/s and 0.0004/s. Theoretically, the modified Arrhenius-type model of additive manufacturing materials at high temperature is established. Experimentally, scanning electron microscope and optical microscope are used to analyze the mechanism of hot deformation. It is found that at 200C both the dendritic eutectic Si and acicular eutectic Si precipitate, forming cellular structure and strengthening phases. And then, the acicular eutectic Si is partially dissolved into Al matrix, but there is no obvious growth of dendritic Si at 300C. With the temperature increasing, the cellular structure and melt pool boundary gradually disappear. For 400C temperature, like homogenization process, the precipitation of saturated solid solution forms the dispersed phase, and the stress-strain curve shows a weak hardening. Meanwhile, the statistical result shows that that the constitutive model agrees well with the experimental results at high temperature. This study may provide guidance for the improvement of additive manufacturing material properties by post-treatment.

源语言英语
文章编号141157
期刊Materials Science and Engineering: A
814
DOI
出版状态已出版 - 13 5月 2021

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