Accurate Simulation of Complex Temperature Field in Counter-Pressure Casting Process Using A356 Aluminum Alloy

Tian, Yuncan; Yang, Dongye; Jiang, Mengqi; He, Bo

doi:10.1007/s40962-020-00456-9

Cited by 5 publications

(1 citation statement)

References 18 publications

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“…The A356 alloy is widely used in lightweight automotive materials, electronic communications and other applications, owing to its excellent casting properties, corrosion resistance and high toughness [ 1 , 2 , 3 ]. Limited by the molding processes of Al alloy castings, such as low-pressure casting, gravity casting and counterpressure casting [ 4 , 5 ], the melt solidifies at a lower cooling rate, which results in a coarser organization of the alloy. In particular, eutectic Si with lamellae severely splits the matrix [ 6 ], which causes stress concentration and greatly reduces the toughness of the alloy.…”

Section: Introductionmentioning

confidence: 99%

Effect of Ultrasonic-Assisted Modification Treatment on the Microstructure and Properties of A356 Alloy

Song

Wang

et al. 2022

Materials

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Ultrasonic treatment was applied to an A356 aluminum melt with different modifiers, and the effects of ultrasonic treatment on the structure and properties of the A356 alloy were studied. The results showed that α-Al was effectively refined with different ultrasonic modification treatments. In particular, ultrasonic treatment showed the most obvious refinement with macroscopic grains of unmodified alloy and optimized the refinement of secondary dendrite arm spacings in the Sr/Ce synergistic alloys. The eutectic Si of the unmodified A356 alloy had no obvious change after the ultrasonic treatment, but the branch diameter of the eutectic Si reduced in the Sr and Sr/Ce modification alloys after the ultrasonic treatment. The ultrasonic treatment significantly improved the ultimate tensile strength and elongation of the as-cast A356 alloy with the unmodified material, which was due to refinement of the α-Al grains by the ultrasonic treatment. After the T6 heat treatment, the ultimate tensile strength values of the alloys showed no obvious change due to the ultrasonic treatment, but the plasticity of the alloy was significantly improved. Mg2Si precipitation was the dominant strengthening mechanism during the T6 heat treatment, while the plasticity was determined by the size and distribution of the eutectic Si. Acoustic cavitation caused by the ultrasound-activated impurities and the induced heterogeneous nucleation and supercooled nucleation in the groove melt was the main cause of the α-Al refinement, the eutectic Si modification and the improvement in the mechanical properties.

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