Deformation Behaviour of Open-cell AlSi10Mg Alloy Formed By Selective Laser Melting (SLM)
P-K. Bai, X. Yang, J. Wang, W-B. Du, Z-Y. Zhao and W-X. Wang
A periodic open-cell AlSi10Mg alloy with a porosity of 54% was prepared using selective laser melting (SLM), and the microstructure, mechanical properties and deformation behaviour during compression were studied. The eutectic Si precipitated in the network. The average surface roughness along the building direction was 8.96 μm and along the vertical building direction was 4.22 μm. This finding could be attributed to the fact that there were more unmelted particles attached to the building direction than to the vertical building direction. The open cell AlSi10Mg alloy designed in this study has typical elastoplastic deformation, collapse and densification stages during the compression deformation process; however, its joints have not fractured during the compression deformation process due to the high compressive strength. All of the pillars connected at the joint fractured after compression, ductile fracture occurred.
Keywords: Fibre laser, open-cell AlSi10Mg alloy, selective laser melting (SLM), additive manufacturing (AM), eutectic Si, deformation, fracture, surface roughness