In this study, AlSi10Mg powders with average diameters of 44 μm are additively manufactured into bulk samples using a selective laser melting (SLM) process. Post-heat treatment to reduce residual stress in the as-synthesized sample is performed at different temperatures. From the results of a tensile test, as the heat-treatment temperature increases from 270 to 320°C, strength decreases while elongation significantly increases up to 13% at 320°C. The microstructures and tensile properties of the two heat-treated samples at 290 and 320°C, respectively, are characterized and compared to those of the as-synthesized samples. Interestingly, the Si-rich phases that network in the as-synthesized state are discontinuously separated, and the size of the particle-shaped Si phases becomes large and spherical as the heat-treatment temperature increases. Due to these morphological changes of Si-rich phases, the reduction in tensile strengths and increase in elongations, respectively, can be obtained by the post-heat treatment process. These results provide fundamental information for the practical applications of AlSi10Mg parts fabricated by SLM.

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  Journal of Materials Research and Technology.2023; 25: 222.     CrossRef
• Effect of Microstructural Evolution on Mechanical Properties and Fracture Modes of AlSi10Mg Blocks Fabricated by Selective Laser Melting after Stress Relief Annealing
  Jianzhu Li, Yujie Li, Zhe Wang, Changguang Li, Hai Yuan, Yun Hao
  Advanced Engineering Materials.2022;[Epub]     CrossRef