AlSi10Mg alloy was prepared by laser powder bed fusion (LPBF). The evolution of microstructure and mechanical properties after diverse aging temperatures were systematically studied. The metastable ultra-fine cellular structure was obtained for as-built specimens. Aging at lower temperatures (100–225°C) promotes the formation of a large number of Si-rich precipitates, and the original Si networks can be retained. With the increase in aging temperature, Si network gradually broke apart, and Si-rich particles grew and spheroidised. The hardness increases with temperatures up to 175°C, and decreases thereafter, while the opposite trend was observed for elongation. Excellent comprehensive mechanical properties with a tensile strength of 381 MPa and elongation of 5.2% can be obtained at 225°C for 2 h.
Highlights
The effect of aging temperatures on microstructure stability and mechanical properties of additive manufacturing AlSi10Mg alloy has been revealed systematically.
The Si-rich precipitates and eutectic Si network were responsible for the observed mechanical properties changes.
A good combination of strength and ductility is obtained at 225°C for 2 h aging heat treatment.
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