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热处理对激光粉末床熔融制造的AlSi10Mg晶格结构梯度微观组织的影响

Effect of Heat Treatment on Gradient Microstructure of AlSi10Mg Lattice Structure Manufactured by Laser Powder Bed Fusion.

作者信息

Liu Mulin, Takata Naoki, Suzuki Asuka, Kobashi Makoto

机构信息

Department of Materials Process Engineering, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan.

出版信息

Materials (Basel). 2020 May 29;13(11):2487. doi: 10.3390/ma13112487.

DOI:10.3390/ma13112487
PMID:32486032
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7321229/
Abstract

The present study addressed the effect of heat treatment process on microstructure of an AlSi10Mg lattice structure with a body-centered cubic unit cell manufactured via laser powder bed fusion (LPBF). The as-manufactured lattice specimen exhibited a unique cellular structure composing of primary a-Al phases bounded by a-Al/Si eutectic microstructure. A gradient microstructure (continuous microstructural changes) was found in the node and strut portions composed of the lattice specimen. The microstructure appears more equiaxed and coarser with approaching the bottom surface of both portions. The continuous microstructural changes contributed to a variation in hardness measured at different locations in the as-manufactured lattice specimen. Si particles finely precipitate in the primary a-Al phases, and eutectic Si particle coarsening occurs at an elevated temperature of 300 °C. The microstructural coarsening is more pronounced at a higher temperature. A number of significantly coarsened Si particles and a stable Fe-containing intermetallic phase (b-AlFeSi) were observed at all locations in 530 °C solution-treated specimen. The homogenous microstructure results in a constant hardness value independent of the location in the lattice specimen. These results provide new insights to control the compressive properties of the AlSi10Mg lattice structure manufactured via LPBF by subsequent heat treatment processes.

摘要

本研究探讨了热处理工艺对通过激光粉末床熔融（LPBF）制造的具有体心立方晶胞的AlSi10Mg晶格结构微观结构的影响。制造后的晶格试样呈现出一种独特的胞状结构，由以α-Al/Si共晶微观结构为界的初生α-Al相组成。在由晶格试样构成的节点和支柱部分发现了梯度微观结构（连续的微观结构变化）。随着接近这两个部分的底面，微观结构看起来更等轴且更粗大。连续的微观结构变化导致了在制造后的晶格试样不同位置测量的硬度变化。Si颗粒在初生α-Al相中精细析出，并且在300℃的升高温度下发生共晶Si颗粒粗化。在较高温度下微观结构粗化更明显。在530℃固溶处理的试样的所有位置都观察到大量明显粗化的Si颗粒和稳定的含铁金属间相（β-AlFeSi）。均匀的微观结构导致硬度值恒定，与晶格试样中的位置无关。这些结果为通过后续热处理工艺控制通过LPBF制造的AlSi10Mg晶格结构的压缩性能提供了新的见解。

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