Comparatively evaluating the room and high temperature mechanical properties of AlSi10Mg alloy produced by selective laser melting

This work deals with the room and high-temperature mechanical properties of selective laser melted (SLMed) AlSi10Mg alloy through conducting compression testing method in a wide range of temperatures (25-450 degrees C) under the strain rate of 0.001s-1. The mechanical properties have been compared with those obtained for thixo-cast A356 alloy and AlCuMg2Si in-situ composite at the same thermomechanical condition. The SLMed AlSi10Mg alloy represented a substantially higher fracture toughness especially at low -temperature regime. Where AlCuMg2Si in-situ composite was fractured at 250 degrees C; and thixocast A356 alloy at 150 degrees C, the SLMed AlSi10Mg alloy tolerated high amount of strain at room temperature and experienced flow stress softening at 150 degrees C and 250 degrees C. The SLMed alloy possessed higher compressive yield strength than other samples at all test tempera-tures. The peak strains were expectedly decreased with the increase in temperature, how-ever, the SLMed alloy kept its stability almost up to 350 degrees C. The softening fraction remained relatively constant (<14%) up to 250 degrees C and then suddenly increased to 22% by further temperature increment to 350 degrees C which may indicate the change in governing softening mechanisms. The degree of barreling was lower in the case of SLMed AlSi10Mg alloy which meant a higher ability of strain accommodation and capability for strain distribution, which was consistent with high imposed strain tolerated at various temperatures.(c) 2022 Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

Automated summary

This study investigates the room and high-temperature mechanical properties of selective laser melted AlSi10Mg alloy and compares them with other alloys. The results show that the SLMed AlSi10Mg alloy has higher fracture toughness, higher strain tolerance at different temperatures, and higher compressive yield strength.