The influence of manufacturing parameters and heat treatments on the properties of AlSi10Mg Alloy produced using L-PBF
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AlSi10Mg has been one of the most studied and employed aluminum alloys for additive
manufacturing via laser powder-bed fusion (L-PBF). The optimization of manufacturing
parameters is important for reducing internal defects, including porosity and inadequate
surface finishes. In addition, heat treatments, such as T6, are often applied to this alloy, but
they degrade the characteristic microstructure obtained via L-PBF additive manufacturing—
the fine cellular structures—which may, in turn, detrimentally affect the material’s properties.
In this context, a new alternative to this treatment, direct aging (DA), has shown
promise in improving the mechanical properties of AlSi10Mg parts produced via L-PBF,
since it preserves the cellular microstructure, precipitating silicon-rich nanoparticles within
the cells. Understanding how different temperatures and heat treatment times influence
the microstructure and, consequently, the properties remains a field to be explored in order
to optimize the treatment conditions and achieve better mechanical properties. Thus, the
objective of this study was to evaluate the influence of manufacturing parameters and
heat treatments on the microstructure and mechanical properties of AlSi10Mg alloy. The
optimized manufacturing conditions were 300 W power, 800 mm/s scan speed, 30 μm
layer thickness, and an argon atmosphere, which led to lower porosity and better finishing.
Samples were heat-treated via DA at 150 ◦C and 170 ◦C for different times, as well as
undergoing a T6 treatment (solution at 520 ◦C followed by aging at 150 ◦C and 170 ◦C).
Initially, the aging curves show higher hardness values for the direct aging condition,
compared to the T6 and as-built conditions, reaching a peak hardness of 195 HV for 6h
of direct aging. In this way, it was followed with microstructural characterization, which
demonstrated that DA maintained the fine cell microstructure of L-PBF and promoted the
precipitation of Si nanoparticles, which certainly contributed to the increase in hardness
compared to T6, which promoted a structure with coarser precipitates. DA at 170 ◦C for
6 h increased the tensile strength to 430 MPa, compared to the as-built condition, with a
slight loss of ductility.
Keywords: heat treatment;
Como referenciar
RIBEIRO, GLEICY de L.X.; REIS, LUIS; OLIVEIRA, RENE de; MASSI, MARCOS; GONÇALVES, RODOLFO L.; COUTO, ANTONIO A. The influence of manufacturing parameters and heat treatments on the properties of AlSi10Mg Alloy produced using L-PBF. Metals, v. 15, n. 9, p. 1-21, 2025. DOI: 10.3390/met15090941. Disponível em: https://repositorio.ipen.br/handle/123456789/49370. Acesso em: 04 Mar 2026.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.