RT Journal Article
SR Electronic
A1 Chlupová, Alice
A1 Poloprudský, Jakub
A1 Jambor, Michal
A1 Brůža, Jaromír
A1 Poczklán, Ladislav
A1 Man, Jiří
T1 Heat Treatment-Induced Microstructural Changes in Selectively Laser Melted AlSi10Mg Alloy
JF Manufacturing Technology Journal
YR 2025
VO 25
IS 6
SP 742
OP 750
DO 10.21062/mft.2025.077
UL https://journalmt.com/artkey/mft-202506-0002.php
AB The study examines the effect of various post-processing heat treatments on the microstructural evolution and hardness of the AlSi10Mg alloy produced by selective laser melting (SLM). The alloy was examined in the as-built (AB) condition and after three heat treatment regimes: direct aging (DA, 160°C/5 h), stress relieving (SR, 300°C/2 h), and solution annealing followed by artificial aging (SA, 520°C/2 h + 170°C/4 h) to better understand the solidification and consolidation processes. A multiscale characterization using OM, SEM, EBSD, TEM, and EDS was performed to reveal the changes in specific microstructures due to additive manufacturing and different levels of heat treatment. The AB state exhibited a fine cellular network of Si within an α-Al matrix, and high hardness (approx. 138 HV1). The DA treatment preserved cellular morphology with mild coarsening, whereas SR led to partial fragmentation of the Si network and a significant drop in hardness (approx. 83 HV1). The SA condition caused recrystallization, Si spheroidization, and formation of Mg- and Fe-rich precipitates, accompanied by moderate hardness recovery (approx. 104 HV1). The persistent crystallographic texture was confirmed across all states.