A precipitation-hardened AlSi10Mg alloy fabricated using selective laser melting

Ahn, Soung Yeoul; Moon, Jongun; Choi, Yeon Taek; Kim, Eun Seong; Jeong, Sang Guk; Park, Jeong Min; Kang, Mungu; Joo, Hyomoon; Kim, Hyoung Seop

doi:10.1016/j.msea.2022.143164

Cited by 16 publications

(1 citation statement)

References 23 publications

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“…Limited by the resolution of the SEM, the authors were not able to detect these small precipitates in their analysis; nevertheless, these precipitates have been well reported in literature for the solution + artificially aged conditions in both, wrought and AM forms. [50][51][52] Among the three HTs that were studied for further fatigue testing, that is, T4-425-NA, T4-525-NA, and T7-475-165, the T7 condition showed the highest tensile strength (i.e., S y = $219 MPa and S u = $275 MPa), while exhibiting the lowest ductility (%El = $13%), as seen in Figure 4C.…”

Section: Discussion 41 | Tensile Behaviormentioning

confidence: 99%

Tensile and fatigue behaviors of additively manufactured AlSi10Mg: Effect of solutionizing and aging heat treatments

Baig

Ghiaasiaan

Shao

et al. 2023

Fatigue Fract Eng Mat Struct

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The effects of various heat treatments on the microstructure and mechanical properties of laser beam powder bed fused AlSi10Mg were investigated. Specimens were solutionized at three different temperatures of 425 C, 475 C, and 525 C followed by natural aging (T4) prior to microstructural and mechanical characterization. In addition, the effect of aging was studied by artificially aging (i.e., T7) some of the solutionized specimens at 165 C. Solutionizing at all temperatures was observed to fully dissolve the additive manufacturing (AM) induced dendritic microstructure, leaving bulky Si and needle-shaped β-AlFeSi precipitates in the grain interiors and boundaries. Tensile results revealed that T4 specimens exhibited more ductility, while T7 specimens showed substantially higher strengths with slightly reduced ductility. Interestingly, no significant effect of heat treatment on strain-life fatigue behavior was observed. Fractography found the Si particles to be responsible for tensile fracture, while AM volumetric defects were the main initiators of fatigue cracks.aluminum, fatigue, laser beam powder bed fusion (LB-PBF/L-PBF), microstructure, tensile Highlights• Effect of heat treatments on tensile and fatigue behavior of L-PBF AlSi10Mg studied.• T7 treatment led to higher tensile strengths than T4, but similar fatigue lives.• Tensile failure initiated from Si-particle fracture or debonding from matrix.• Fatigue life was affected by the size of crack initiators, that is, volumetric defects. | INTRODUCTIONAluminum alloys are commonly used in various industries because of their superior strength/stiffness to weight ratio compared to other alloys. 1,2 Among various Al alloys, AlSi10Mg as a cast alloy 2 has historically been used to fabricate complex/thin-walled geometries. Recently, processing AlSi10Mg through additive manufacturing (AM) has shown to be very promising as intricate, lightweight parts can be manufactured without

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Section: Discussion 41 | Tensile Behaviormentioning

confidence: 99%

Tensile and fatigue behaviors of additively manufactured AlSi10Mg: Effect of solutionizing and aging heat treatments

Baig

Ghiaasiaan

Shao

et al. 2023

Fatigue Fract Eng Mat Struct

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The Effect of the Iso‐Thermal Heat Treatment on the Microstructure and Properties of Powder Bed Fusion–Laser Beam AlSi10Mg Alloy

Katti,

Zhang,

Qiu

et al. 2024

Adv Eng Mater

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The effect of various iso‐thermal heat treatments on powder bed fusion‐laser beam (PBF‐LB) AlSi10Mg alloy has been widely studied; however, a process‐property relationship has not yet been established. In addition, the eutectic Al‐Si network breakdown and coarsening of eutectic Si from low‐to high (200oC–500oC) temperature heat treatment has not been investigated systematically. Therefore, the AlSi10Mg alloy is heat‐treated at 200oC, 300oC, 400oC, and 500oC for various holding times ranging from 0.5 to 32 hours. Uniaxial tensile and hardness tests are conducted, and the microstructure is characterised in detail. A unique approach is adopted for estimating Si solubility where 200oC heat‐treated microstructure data is used to estimate solute trapping due to the high cooling rate in the as‐fabricated state. Furthermore, it was observed that increasing the heat treatment temperature and time reduces the strength and strain hardening rate but increases the tensile elongation up to 400oC heat treatment. Above 500oC, the yield strength increases, and the elongation reduces compared with the 400oC heat treatment owing to the refined Fe containing dispersoid formation at 500oC. The important outcome of this study is heat treatment process‐property contour maps that are useful for fine‐tuning the mechanical properties of PBF‐LB AlSi10Mg alloy for industrial rapid prototyping application.This article is protected by copyright. All rights reserved.

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Fracture toughness of AlSi10Mg alloy produced by LPBF: effects of orientation and heat treatment

Lupi,

Minerva,

Patriarca

et al. 2024

Int J Fract

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In this study, AlSi10Mg samples were manufactured by laser-powder bed fusion process to explore the fracture toughness dependence on both built orientation and aging treatment. The experiments were performed on as-built and directly-aged (200$$^{\circ }$$ ∘ C/4 h) conditions, with the latter revealed to be a valuable treatment for improving fracture toughness. A comprehensive investigation involving detailed microstructural analysis, grain-orientation mapping, and crack-tip strain measurements was conducted to investigate the mechanisms governing the material behavior. The results revealed that specimens subjected to direct aging display higher toughness, thereby enhancing the fracture resistance of AlSi10Mg. Moreover, a considerable variation in fracture toughness values was observed for the different printing orientations, indicating the existence of manufacturing-induced anisotropy. The findings highlight that this anisotropy mainly correlates with the distinctive microstructure induced by the additive manufacturing process. In particular, this study focuses on the different preferential crack paths dictated by the melt pool boundaries orientation respective the crack propagation direction. A substantial reduction in fracture toughness was observed when the crack propagates along the melt pool boundaries.

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A precipitation-hardened AlSi10Mg alloy fabricated using selective laser melting

Cited by 16 publications

References 23 publications

Tensile and fatigue behaviors of additively manufactured AlSi10Mg: Effect of solutionizing and aging heat treatments

Tensile and fatigue behaviors of additively manufactured AlSi10Mg: Effect of solutionizing and aging heat treatments

The Effect of the Iso‐Thermal Heat Treatment on the Microstructure and Properties of Powder Bed Fusion–Laser Beam AlSi10Mg Alloy

Fracture toughness of AlSi10Mg alloy produced by LPBF: effects of orientation and heat treatment

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