A High-Strength Alsimg1.4 Alloy Fabricated By Selective Laser Melting

A high Mg-content AlSiMg1.4 alloy was designed for selective laser melting (SLM) processing. The SLMed AlSiMg1.4 alloy exhibits a high yield strength of 341 +/- 14 MPa and a high ultimate tensile strength of 518 +/- 6 MPa, along with a total elongation of 7.1 +/- 0.4%. The composition profile in the alpha-Al matrix of the alloy manifests in-phase concentration fluctuations of Mg and Si. The presence of high density Mg-Si atomic clusters as strong obstacles to dislocation gliding is suggested to provide an additional strengthening mechanism for the SLMed Al-Si-Mg alloy. (C) 2021 Elsevier B.V. All rights reserved.