Microstructure evolution of Al-Si semi-solid slurry by gas bubble stirring method

Zhang, Lei; Dong, Xiaojuan; Li, Jiqiang; Li, Kan; Zhang, Zong-kui; Wang, Wenjun; Zhao, Fan

doi:10.1007/s11771-011-0903-3

Cited by 12 publications

(4 citation statements)

References 17 publications

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“…After stirring for a period of time, broken dendrites generated in the initial stage of bubble stirring can be rounded [34], because holding promotes the uniform distribution of melt temperature. In order to reduce the surface energy, broken dendrites will spontaneously develop towards rose-like and spherical shape, as shown in Figure 6a.…”

Section: Influence Of Holding Time On Semi-solid Microstructurementioning

confidence: 99%

Effects of Process Parameters on Microstructure and Mechanical Properties of Semi-Solid Al-7Si-0.5Mg Aluminum Alloy by Gas Induced Semi-Solid Process

Xiang

et al. 2022

Metals

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Al-7Si-0.5Mg aluminum alloy semi-solid slurry with good spherical grains was prepared by gas induced semi-solid process (GISS) and the effects of both holding time and medium alloy addition on the microstructure of the semi-solid slurry were investigated. These two parameters have a great influence on the solid fraction, the size and the sphericity of the grains. With holding time increased from 85 s to 270 s, the solid phase fraction of the semi-solid slurry decreased from ~0.77 to ~0.67, the average grain size increased from ~95 μm to ~225 μm and the average shape factor decreased from ~0.80 to ~0.33. When medium alloy addition varied in the range of 0.5–2.0 wt%, a better slurry microstructure was obtained at about 1.5 wt%. Compared with the conventional liquid die-casting, the semi-solid die-casting improved the mechanical properties of tensile bars; yield strength, tensile strength and elongation of tensile bars reached ~240 MPa, ~307 MPa and ~8.8% after heat treatment, respectively. In conclusion, GISS process can prepare the semi-solid slurry with uniform and round microstructure, and the semi-solid die-casting can improve mechanical properties of Al-7Si-0.5Mg aluminum alloy.

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Section: Influence Of Holding Time On Semi-solid Microstructurementioning

confidence: 99%

Effects of Process Parameters on Microstructure and Mechanical Properties of Semi-Solid Al-7Si-0.5Mg Aluminum Alloy by Gas Induced Semi-Solid Process

Xiang

et al. 2022

Metals

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“…Or it will seriously affect the BF smooth operation and the stability of thermal system. So iron concentrates pretreated by mineral separation process can not be able to be directly used for BF process [3].It is significant for the study on removing tin from tin-bearing iron ore to accomplish the effective utilization of tin-bearing iron ore resources early.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Study on the Sulfidation-Magnetic Roasting of the Hematite Type of Tin-Bearing Iron Ore

Liao

Wang

et al. 2014

AMM

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Sulfidation-magnetic roasting process was used to treat tin-bearing iron ore of hematite to recovery iron resources. The results of thermodynamics analysis of the roasting reaction trait showed that, when CO concentration was lower than 11.43% at temperature higher than 873K, SnO2 and Fe2O3 could be selectively reduced to SnO and Fe3O4, respectively. FeS2 would be decomposed into FeS and S2 during the roasting process, and the S2 sulfidation effect was stronger than FeS. After roasting, the main iron phase of the minerals was changed into magnetite from hematite and then the iron could be recovered through the magnetic separation. This method provides a new method for the recovery of iron from tin-bearing iron ore of hematite.

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“…Semisolid metal forming is one of the advanced metal forming techniques, which has advantages of short forming process, easy deformation, and good microstructure and properties of product, so it has become a hot research topic in the recent years [1]. Flemings proposed firstly semisolid metal processing (SSP) [2,3].…”

Section: Introductionmentioning

confidence: 99%

Effects of Process Parameters on Microstructure of A2017 Alloy Strip Produced by a Novel Semisolid Rolling

Zhao

Guan

Wang

et al. 2013

Advances in Mechanical Engineering

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In order to produce A2017 alloy strip, a novel semisolid rolling process was studied. The effects of process parameters on microstructure were investigated. The experimental results show that the grain size and roundness of A2017 alloy strip increase with the increment of casting temperature. The grain size of strip decreases firstly and then increases with the increment of vibration frequency. When the sloping plate length was between 500 mm and 600 mm, the casting temperature was between 650 ∘ C and 680 ∘ C, the roll speed was 0.087 m ⋅ s −1 , and the vibration frequency was 50 Hz, A2017 alloy strip with a cross-sectional size of 4 × 160 mm was produced. The microstructure of strip is mainly composed of fine spherical or rosette grains with a certain elongation along rolling direction, and the average grain size is 36.4 m.

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Microstructure evolution of Al-Si semi-solid slurry by gas bubble stirring method

Cited by 12 publications

References 17 publications

Effects of Process Parameters on Microstructure and Mechanical Properties of Semi-Solid Al-7Si-0.5Mg Aluminum Alloy by Gas Induced Semi-Solid Process

Effects of Process Parameters on Microstructure and Mechanical Properties of Semi-Solid Al-7Si-0.5Mg Aluminum Alloy by Gas Induced Semi-Solid Process

Thermodynamic Study on the Sulfidation-Magnetic Roasting of the Hematite Type of Tin-Bearing Iron Ore

Effects of Process Parameters on Microstructure of A2017 Alloy Strip Produced by a Novel Semisolid Rolling

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