Effect of aging temperature on microstructure of AlSi7Mg alloy prepared by selective laser melting

doi:10.13251/j.issn.0254-6051.2023.07.036

Abstract

Abstract: Effect of aging temperature on microstructure of AlSi7Mg alloy formed by selective laser melting (SLM) was studied by means of scanning electron microscope (SEM), optical microscope (OM) and energy dispersive spectrometer (EDS). The results show that micro pinholes occure in the SLM formed AlSi7Mg alloy, as well as net-like microstructure in scanning direction and scale-like microstructure in building direction, meanwhile, punctiform and short rod-like eutectic Si is evenly distributed in Al matrix as particles. With the increase of aging temperature, the porosity increases, the net-like and scale-like microstructure gradually blur until disappeare, and even dendritic morphology appears, while the eutectic Si grows up, showing needle-like and bulk-like morphology. When the aging temperature is blow 300 ℃, the separated Si and Mg precipitate in the ultrafine-grained structure of the AlSi7Mg alloy, which form Mg₂Si strengthening phase. When the aging temperature is higher than 300 ℃, the grain of the AlSi7Mg alloy refines, the reticular eutectic Si are destroyed and grouped and grown, which increases the cleavage effect on Al matrix.

Key words: selective laser melting, AlSi7Mg alloy, micro pinhole, eutectic Si, microstructure

CLC Number:

TG146

Liu Song. Effect of aging temperature on microstructure of AlSi7Mg alloy prepared by selective laser melting[J]. Heat Treatment of Metals, 2023, 48(7): 205-213.

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