Role of the solidification cells on the yield strength of the Al-Si-Mg alloy manufactured using laser powder bed fusion: A micropillar compression study

Role of the solidification cells on the yield strength of the Al-Si-Mg alloy manufactured using laser powder bed fusion: A micropillar compression study

Scripta Materialia

10.1016/j.scriptamat.2023.115566

http://dx.doi.org/10.1016/j.scriptamat.2023.115566

Shi-Hao Li, Yakai Zhao, Upadrasta Ramamurty

17 May 2023

Li, S.-H., Zhao, Y., & Ramamurty, U. (2023). Role of the solidification cells on the yield strength of the Al-Si-Mg alloy manufactured using laser powder bed fusion: A micropillar compression study. Scripta Materialia, 234, 115566. https://doi.org/10.1016/j.scriptamat.2023.115566

To ascertain the role of the solidification cell structures on the mechanical performance of Al-Si-(Mg) alloys processed using the laser powder bed fusion (LPBF) technique, micropillar compression tests were performed on LPBF Al Al-10Si-0.3Mg (AlSi10Mg). The alloy’s microstructure consists of submicron-scale cellular structures, dense dislocation networks, and dispersed nanoscale Si precipitates. The stress-strain responses of the micropillars are devoid of pronounced serrations and the yield strength and work hardening behaviors are size-independent. A comparison of the micropillar compression responses of the LPBF AlSi10Mg, 316L stainless steel and Inconel 718 alloy, and nano-and micro-crystalline alloys is made. In LPBF AlSi10Mg, the combination of dislocation networks and shear-resistant Si particles resist the dislocation motion significantly and enhance dislocation storage. This results in the cellular structure dominating the strength and plastic flow. These results show a pathway for designing high strength alloys via additive manufacturing.

Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)

This research / project is supported by the Agency for Science, Technology and Research - Structural Metal Alloys Programme
Grant Reference no. : A18B1b0061

https://oar.a-star.edu.sg/communities-collections/articles/20893

1359-6462

Institute of Materials Research & Engineering