Microstructure and properties of spinning deformed A356 alloy subject to the solution-DCT-aging multiplex heat treatment

Wang, H.M.; Li, K.; Li, G.R.; Su, W.X.; Chou, S.S.; Wu, T.T.; Fan, Xiaoguang

doi:10.1016/j.jmrt.2023.02.157

Cited by 7 publications

(1 citation statement)

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“…For example, the EN AW 6026 alloy demonstrated enhanced strength and hardness following a combined DC and aging treatment, attributed to the elevated density of peak aging strengthening precipitates [25]. Similarly, the A356 alloy achieved superior mechanical properties through a multistep heat treatment sequence incorporating solid-solution, DC, and aging processes [26]. For AM metallic alloys, it also has been reported that Inconel 718 achieves remarkable tensile strength and ductility through a strategic combination of DC processing, annealing, and aging treatments [24].…”

Section: Introductionmentioning

confidence: 99%

Effect of Deep Cryogenic Aging Treatment on Microstructure and Mechanical Properties of Selective Laser-Melted AlSi10Mg Alloy

Tang,

Yan,

et al. 2024

Metals

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Deep cryogenic aging (DCA) is a newly developed heat treatment technique for additive-manufactured metallic materials to reduce residual stress and improve their mechanical properties. In this study, AlSi10Mg alloy samples fabricated by selective laser melting were deep-cryogenic-treated at −160 °C and subsequently aged at 160 °C. Phase and microstructural analyses were conducted using X-ray diffraction, optical microscopy, scanning electron microscopy, and transmission electron microscopy, while the mechanical properties were evaluated through microhardness and tensile testing at room temperature. The results indicated that the DCA treatment did not have an effect on the morphology of the melt pools. However, it facilitated the formation of atomic clusters and nanoscale Si and β′ phases, as well as accelerating the coarsening of grains and the ripening of the eutectic Si phase. After DCA treatment, the mass fraction of the Si phase experienced an increase from 4.4% to 7.2%. Concurrently, the volume fraction of the precipitated secondary phases elevated to 5.1%. The microhardness was enhanced to 147 HV, and the ultimate tensile strength and yield strength achieved 495 MPa and 345 MPa, respectively, with an elongation of 7.5%. In comparison to the as-built specimen, the microhardness, ultimate tensile strength, and yield strength increased by 11.4%, 3.1%, and 19.0%, respectively. The improvement in mechanical properties is primarily attributed to the Orowan strengthening mechanism induced by the secondary phases.

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Section: Introductionmentioning

confidence: 99%