Microstructural evolution and mechanical property of Al–Mg–Mn alloys with various solidification cooling rates

Wang, Yu; Gao, Minqiang; Yang, Bowei; Zhao, Ertuan; Liu, Fengguo; Guan, Renguo

doi:10.1016/j.matchar.2021.111709

Cited by 24 publications

(3 citation statements)

References 42 publications

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“…Various techniques, such as chemical additives 6 – 8 and rapid cooling methods 9 , 10 have been used to control the solidification structure in the casting industry. Chemical additives have been considered a common technique to refine or modify the phase.…”

Section: Introductionmentioning

confidence: 99%

Effect of cavity shape on microstructural evolution of pure aluminum in electrically-assisted solidification

Choi

Kim

et al. 2023

Sci Rep

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Grain refinement is a crucial issue in metallic materials. One of the emerging techniques to obtain equiaxed grains is to apply an electric current to the liquid metal during solidification. With this view, in this paper, the effect of electric current on the solidification behavior in various cavity shapes of mold was investigated. Cylinder-, cube-, and cuboid-shaped cavities designed to have similar cavity volume were used. By applying an electric current during the solidification of liquid aluminum, the grains were effectively refined with a grain size of approximately 350 µm for all three types of cavities. The circulating flow of liquid aluminum was observed to have a similar shear rate intensity in all three types of cavities, which is known to be sufficiently high (over hundreds of s−1) to induce dendrite fragmentation resulting newly generated nuclei. Dispersion of nuclei on unsolidified aluminum appeared differently according to the shape of the cavity, which influences final shape of refined zone. The area fraction of refined zone was affected by the relative relationship between the solidification completion time and the electric current application time. This study will provide insight to control of process parameters when electrically-assisted solidification is applied to a real product with a complex shape.

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Section: Introductionmentioning

confidence: 99%

Effect of cavity shape on microstructural evolution of pure aluminum in electrically-assisted solidification

Choi

Kim

et al. 2023

Sci Rep

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“…5xxx Al-Mg alloys provide a high degree of weldability and corrosion resistance with a medium level of strength due to their high Mg content [1][2][3]. However, Al-Mg alloys with high Mg content tend to form β-Al 3 Mg 2 phases, resulting in the deterioration of mechanical properties [4]. Moreover, nonbeneficial kinetics impede precipitation hardening by β-Al 3 Mg 2 , which renders Al-Mg alloys non-heat-treatable [5].…”

Section: Introductionmentioning

confidence: 99%

Effects of Heat Treatment on Microstructure and Mechanical Properties of Weldable Al–Mg–Zn–Sc Alloy with High Strength and Ductility

et al. 2023

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A weldable Al–Mg–Zn–Sc alloy was produced using vacuum induction melting and an argon-protected casting method to achieve high strength and ductility, and the effects of heat treatment on the microstructure evolution and mechanical properties of Al–Mg–Zn–Sc alloys were comparatively investigated. The results reveal that fine equiaxed grains with an average grain size of 40 μm in an as-cast Al–Mg–Zn–Sc alloy change little after heat treatments, bringing about a grain-boundary strengthening of 46.1 MPa. The coarse T-Mg32(Al, Zn)49 phases at grain boundaries are completely dissolved into the matrix through solid-solution treatment, and T-Mg32(Al, Zn)49 with diameters ranging from 10 to 25 nm and Al3Sc with diameters ranging from 5 to 20 nm gradually precipitate during the artificial aging process. The Mg solid solubility is 4.67% in the as-cast Al–Mg–Zn–Sc alloy, and it increased to 5.33% after solid-solution treatment and dramatically decreased to 4.15% after post-aging treatment. The contributions of solid-solution strengthening to as-cast, post-solid-solution and post-aging Al–Mg–Zn–Sc alloys are 78.2 MPa, 85.4 MPa and 72.3 MPa, respectively. The precipitation strengthening of the post-aging alloy is 49.7 MPa, which is an increase of 21% in comparison to that of both as-cast and post-solid-solution alloys. The alloy achieves an optimal tensile strength of 355.3 MPa, yield strength of 175 MPa and elongation of 22% after undergoing solid-solution treatment.

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“…[18,31,32] Higher solidification cooling rates can offer several benefits for Al-Mg alloys, such as a refined and uniform cast microstructure with less microsegregation of solute, suppression of undesirable intermetallic phases, promotion of stable α-phases, enhanced mechanical properties, increased process efficiency, faster production rates, and less energy consumption. [9,[33][34][35]…”

mentioning

confidence: 99%

Anomalous Mitigation in Phase Evolution Impacting Thermal Stability in a Rapidly Solidified AA5182 Al–Mg Alloy via Continuous Thin‐Strip Casting

Pouraliakbar,

Howells,

Gallerneault

et al. 2023

Adv Eng Mater

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This study, for the first time, reports an anomalous phase evolution and its impact on the thermal and oxidation behavior of rapidly solidified AA5182 Al–Mg alloy strip fabricated using a novel thin‐strip (TS) continuous casting technique. The microstructural analysis reveals a through‐thickness gradient microstructure of distinct types, morphology, and fractions of nonequilibrium Al–Mn–Fe intermetallic and Al–Mg eutectic phases. The rapid solidification experienced in TS casting effectively mitigates the formation of phases, particularly with the Al–Mg (β‐Al3Mg2) eutectic, being nearly absent from the near‐surface regions. The total fraction of formed phases is considerably lower than that in the slowly cooled direct‐chill counterpart. The solute macrosegregation also shows an inverse Mg segregation profile toward the strip surface primarily due to a higher degree of matrix supersaturation closer to the strip surface. Modeling of solidification successfully predicts the influence of cooling rate on the fractions of the nonequilibrium eutectic phase, agreeing well with the experimental data obtained from image analysis. Heat treating the samples over a broad temperature range unveiled unexpected improvements in oxidation resistance and excellent thermal stability, attributed to the absence of the eutectic β‐phase in subsurface regions. The research findings have practical implications for improving the properties of sheet Al–Mg alloys.

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Microstructural evolution and mechanical property of Al–Mg–Mn alloys with various solidification cooling rates

Cited by 24 publications

References 42 publications

Effect of cavity shape on microstructural evolution of pure aluminum in electrically-assisted solidification

Effect of cavity shape on microstructural evolution of pure aluminum in electrically-assisted solidification

Effects of Heat Treatment on Microstructure and Mechanical Properties of Weldable Al–Mg–Zn–Sc Alloy with High Strength and Ductility

Anomalous Mitigation in Phase Evolution Impacting Thermal Stability in a Rapidly Solidified AA5182 Al–Mg Alloy via Continuous Thin‐Strip Casting

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