Rheological Research of Semi-Solid AlSi7Mg Slurry by High-Energy Ultrasound and Cerium Addition

Zhang, Lijie; Yan, Hong; Xu, Lixiao

doi:10.1007/s11665-021-05985-w

Cited by 5 publications

(1 citation statement)

References 28 publications

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“…Zhao reported that the average grain sizes of as-cast 7050 alloys were reduced by more than 50% with ultrasonic treatment [ 25 ]. Zhang et al prepared AlSi7Mg-1.0Ce semisolid ingots with the ultrasonic treatment, and the average grain diameter and shape factor of the primary α-Al were reduced to 57.54 μm and 1.33, respectively [ 26 ]. Peng et al indicated that the segregation index of Cu elements in the semicontinuous casting Al-Cu alloys was reduced from 0.23 to 0.15 after ultrasonic treatment [ 27 ].…”

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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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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Research on pressure loss and filling ability of semi-solid rheological behavior in squeeze casting

Wang

2022

Int J Adv Manuf Technol

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The filling ability of alloy fluid under pressure is of great significance to improve the dimensional integrity and mechanical properties of thin-walled and slender rods formed by squeeze casting. Insight into the rheological behavior of squeeze casting is beneficial to improve the formability of complex structural parts by optimizing the squeeze casting process. In this work, the Archimedes spiral sample prepared by indirect squeeze casting was applied to investigate the variation of filling length with squeeze pressure and filling speed during the rheological process in squeeze casting. According to the temperature distribution characteristic during the alloy melt filling process, the alloy fluid state was discussed and the spiral filling was confirmed as a semi-solid rheological behavior. The calculation models of pressure loss and filling length were established respectively based on steady-state rheological behavior. Pressure loss is mainly affected by the melt viscosity which is determined by temperature distribution and filling speed of alloy melt in the channel. According to the agreement between the theoretical calculations and the experimental results, the pressure loss and filling length models have been confirmed to be used to quantitatively characterize the filling ability of the aluminum alloy melt in the squeeze casting process.

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Microstructural Morphology and Mechanical Properties of Cooling Slope Rheocast A380 Al Alloy

Das

2022

J. of Materi Eng and Perform

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Rheological Research of Semi-Solid AlSi7Mg Slurry by High-Energy Ultrasound and Cerium Addition

Cited by 5 publications

References 28 publications

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

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

Research on pressure loss and filling ability of semi-solid rheological behavior in squeeze casting

Microstructural Morphology and Mechanical Properties of Cooling Slope Rheocast A380 Al Alloy

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