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Zheng Liu - One of the best experts on this subject based on the ideXlab platform.

  • Effect of Electromagnetic Stirring on Morphology Evolution of Mg2Si in Hypereutectic Al-Si Alloy Composite
    Applied Mechanics and Materials, 2012
    Co-Authors: Zheng Liu, Zhi Peng Zhou
    Abstract:

    Mg2Si reinforced hypereutectic Al-Si composite was prepared and the effects of electro- magnetic Stirring on Mg2Si particle in the composite were researched. The results indicated that there were the important effects of Electromagnetic Stirring on size and morphology of the particle in the composite. The morphology and size of the particle in the composite were obviously improved by Electromagnetic Stirring. In comparison with the sample without isothermal holding, the size of the particle isothermally held slightly increased under the same Stirring condition, but the roundness of the particle was improved. After isothermal holding, the mechanical properties of the composite prepared by Electromagnetic Stirring were improved to some extent.

  • Effects of Electromagnetic Stirring on Morphology Evolution of Primary Phase in Semisolid Alloy
    Advanced Materials Research, 2011
    Co-Authors: Zheng Liu, Xiao Mei Liu
    Abstract:

    The effects of Electromagnetic Stirring on the morphology evolution of primary phase in semisolid A356 alloy slurry prepared by low superheat pouring and slightly Electromagnetic Stirring (LSPSES) were studied. The results indicated that the slurry containing globular-like primary phase was prepared by LSPSES, and the Electromagnetic Stirring within range of Stirring power studied had the obvious effect on the morphology of primary phase in the slurry. The morphology of primary phase with finer size slurry was evoluted to globullar-like with increase of Stirring power.

  • Semi-Solid A356 Alloy Slurry Prepared by Slightly Electromagnetic Stirring with Ti-Based Refiner
    Advanced Materials Research, 2010
    Co-Authors: Zheng Liu, Xiao Mei Liu, W. M. Mao
    Abstract:

    The semi-solid A356 alloy slurry is prepared by slightly Electromagnetic Stirring with Ti-based refiner. The effects of the refiner on the morphology and the grain size of the primary phase in the slurry are researched. The results indicate that the slurry with particle-like and rosette-like primary phases can be prepared by slightly Electromagnetic Stirring with the refiner. Compared with the A356 alloys without the refiner, the grain size and particle morphology of primary phase as well as the distribution of the grain with particle-like or rosette-like along radial in the ingot in A356 are markedly improved by the refiner.

  • Characterization on morphology evolution of primary phase in semisolid A356 under slightly Electromagnetic Stirring
    Transactions of Nonferrous Metals Society of China, 2010
    Co-Authors: Zheng Liu, W. M. Mao, Xiao Mei Liu
    Abstract:

    Abstract The effects of slight Electromagnetic Stirring on morphology of primary phase in semisolid A356 prepared by low superheat pouring and slight Electromagnetic Stirring were researched, and some characteristic parameters characterized the morphology and grain size of the primary phase were calculated. The results indicate that the Stirring power has an important effect on the morphology and the grain size. The characteristics of the morphology could be characterized by the fractal dimensions and the shape factors. The fractal dimension and the shape factor change when the morphology changes with processing conditions. Both increase with the increase of the Stirring power, but the fractal dimension is still affected by the grain size. The increase of Stirring power could obviously improve the grain size, fractal dimension and shape factor of the primary phase.

  • Research on semi-solid slurry of a hypoeutectic Al-Si alloy prepared by low superheat pouring and weak Electromagnetic Stirring
    Rare Metals, 2006
    Co-Authors: Zheng Liu, W. M. Mao, Z. D. Zhao
    Abstract:

    The semi-solid slurry of a hypoeutectic Al-Si alloy was manufactured by low superheat pouring and weak Electromagnetic Stirring. The effects of pouring temperature and Stirring power on the semi-solid slurry were investigated. The results indicated that the semi-solid slurry to satisfy rheocasting can be manufactured by low superheat pouring and weak Electromagnetic Stirring. The pouring temperature (or superheat) and the Stirring power remarkably affected the morphology of primary ??-Al and the size of primary ??-Al, and there is no obvious effect of Stirring time on primary ??-Al. Compared with the samples made by low superheat pouring with no Stirring, the nucleation rate, particle morphology and grain size of primary a-Al in A356 were markedly improved by low superheat pouring and weak Electromagnetic Stirring. On the condition of weak Electromagnetic Stirring, the pouring temperature with low superheat can be suitably raised to reach the effectiveness obtained from the lower pouring temperature without Stirring.

Z. D. Zhao - One of the best experts on this subject based on the ideXlab platform.

  • Preparation of semisolid AlSi7Mg alloy slurry through weak traveling-wave Electromagnetic Stirring
    International Journal of Minerals Metallurgy and Materials, 2009
    Co-Authors: Z. D. Zhao, W. M. Mao, Rong-mao Zhong
    Abstract:

    Abstract The semisolid AlSi7Mg alloy slurry with large capacity was prepared by low superheat pouring and week traveling-wave Electromagnetic Stirring. The effects of Electromagnetic Stirring power and frequency on the shape and distribution of primary α-Al grains in the AlSi7Mg alloy slurry were discussed. The experimental results show that the AlSi7Mg alloy slurry with fine and spherical primary α-Al grains distributed homogeneously can be obtained. Under the condition of low superheat pouring and week traveling-wave Electromagnetic Stirring, when the pouring temperature is 630°C, raising the Stirring power or frequency appropriately can gain a better shape of primary α-Al grains; but if the Stirring power or frequency is increased to a certain value (1.72 kW or10 Hz), the shape of primary α-Al grains cannot be obviously improved and spherical primary α-Al grains distributed homogeneously can be still obtained.

  • Research on semi-solid slurry of a hypoeutectic Al-Si alloy prepared by low superheat pouring and weak Electromagnetic Stirring
    Rare Metals, 2006
    Co-Authors: Zheng Liu, W. M. Mao, Z. D. Zhao
    Abstract:

    The semi-solid slurry of a hypoeutectic Al-Si alloy was manufactured by low superheat pouring and weak Electromagnetic Stirring. The effects of pouring temperature and Stirring power on the semi-solid slurry were investigated. The results indicated that the semi-solid slurry to satisfy rheocasting can be manufactured by low superheat pouring and weak Electromagnetic Stirring. The pouring temperature (or superheat) and the Stirring power remarkably affected the morphology of primary ??-Al and the size of primary ??-Al, and there is no obvious effect of Stirring time on primary ??-Al. Compared with the samples made by low superheat pouring with no Stirring, the nucleation rate, particle morphology and grain size of primary a-Al in A356 were markedly improved by low superheat pouring and weak Electromagnetic Stirring. On the condition of weak Electromagnetic Stirring, the pouring temperature with low superheat can be suitably raised to reach the effectiveness obtained from the lower pouring temperature without Stirring.

  • Effect of pouring temperature on semi-solid slurry of A356 Al alloy prepared by weak Electromagnetic Stirring
    Transactions of Nonferrous Metals Society of China (English Edition), 2006
    Co-Authors: Zheng Liu, W. M. Mao, Z. D. Zhao
    Abstract:

    The semi-solid slurry of A356 Al alloy was manufactured by low superheat pouring and weak Electromagnetic Stirring. The effects of pouring temperature on the slurry manufactured by weak Electromagnetic Stirring were researched. The results indicate that it is feasible to manufacture the slurry with particle-like primary phases by low superheat pouring and weak Electromagnetic Stirring, and there is an important effect of the pouring temperature (superheat temperature) on the morphology and the size of primary ??-Al in A356 Al alloy. By the action of suitable weak Electromagnetic Stirring, increasing pouring temperature to put low superheat pouring in practice is capable of obtaining semi-solid slurry of A356 Al alloy with particle-like primary phase. Compared with the samples made only by low superheat pouring without Stirring, raising pouring temperature by 15-35??C above the liquidus temperature under condition of weak Electromagnetic Stirring can ensure the same grain size and morphology of the primary phase.

W. M. Mao - One of the best experts on this subject based on the ideXlab platform.

  • Preparation of Semisolid A356 Al Alloy Slurry by Low Superheat Pouring and Weak Traveling-Wave Electromagnetic Stirring
    Advanced Materials Research, 2011
    Co-Authors: Guo Xing Tang, W. M. Mao, Yong Feng Liu
    Abstract:

    The semisolid slurry of A356 Al alloy was preparation by low superheat pouring and weak traveling-wave Electromagnetic Stirring. The effects of pouring temperature and Stirring power on the semisolid slurry were researched. The results show that the shape of primary α-Al experiences a transition from rosette-like grains to spherical grains with the pouring temperature lowing gradually, and the smaller grains with a spherical appearance distribute in the microstructure homogeneously. The appropriately raising the Electromagnetic Stirring power is good for the formation of the semisolid A356 Al alloy slurry with spherical microstructure. On the condition of weak traveling-wave Electromagnetic Stirring, the pouring temperature with low superheat can be suitably raised to reach the effectiveness obtained from the lower pouring temperature without Stirring. Therefore the pouring operation is simple and convenient.

  • Semi-Solid A356 Alloy Slurry Prepared by Slightly Electromagnetic Stirring with Ti-Based Refiner
    Advanced Materials Research, 2010
    Co-Authors: Zheng Liu, Xiao Mei Liu, W. M. Mao
    Abstract:

    The semi-solid A356 alloy slurry is prepared by slightly Electromagnetic Stirring with Ti-based refiner. The effects of the refiner on the morphology and the grain size of the primary phase in the slurry are researched. The results indicate that the slurry with particle-like and rosette-like primary phases can be prepared by slightly Electromagnetic Stirring with the refiner. Compared with the A356 alloys without the refiner, the grain size and particle morphology of primary phase as well as the distribution of the grain with particle-like or rosette-like along radial in the ingot in A356 are markedly improved by the refiner.

  • Characterization on morphology evolution of primary phase in semisolid A356 under slightly Electromagnetic Stirring
    Transactions of Nonferrous Metals Society of China, 2010
    Co-Authors: Zheng Liu, W. M. Mao, Xiao Mei Liu
    Abstract:

    Abstract The effects of slight Electromagnetic Stirring on morphology of primary phase in semisolid A356 prepared by low superheat pouring and slight Electromagnetic Stirring were researched, and some characteristic parameters characterized the morphology and grain size of the primary phase were calculated. The results indicate that the Stirring power has an important effect on the morphology and the grain size. The characteristics of the morphology could be characterized by the fractal dimensions and the shape factors. The fractal dimension and the shape factor change when the morphology changes with processing conditions. Both increase with the increase of the Stirring power, but the fractal dimension is still affected by the grain size. The increase of Stirring power could obviously improve the grain size, fractal dimension and shape factor of the primary phase.

  • Preparation of semisolid AlSi7Mg alloy slurry through weak traveling-wave Electromagnetic Stirring
    International Journal of Minerals Metallurgy and Materials, 2009
    Co-Authors: Z. D. Zhao, W. M. Mao, Rong-mao Zhong
    Abstract:

    Abstract The semisolid AlSi7Mg alloy slurry with large capacity was prepared by low superheat pouring and week traveling-wave Electromagnetic Stirring. The effects of Electromagnetic Stirring power and frequency on the shape and distribution of primary α-Al grains in the AlSi7Mg alloy slurry were discussed. The experimental results show that the AlSi7Mg alloy slurry with fine and spherical primary α-Al grains distributed homogeneously can be obtained. Under the condition of low superheat pouring and week traveling-wave Electromagnetic Stirring, when the pouring temperature is 630°C, raising the Stirring power or frequency appropriately can gain a better shape of primary α-Al grains; but if the Stirring power or frequency is increased to a certain value (1.72 kW or10 Hz), the shape of primary α-Al grains cannot be obviously improved and spherical primary α-Al grains distributed homogeneously can be still obtained.

  • Research on semi-solid slurry of a hypoeutectic Al-Si alloy prepared by low superheat pouring and weak Electromagnetic Stirring
    Rare Metals, 2006
    Co-Authors: Zheng Liu, W. M. Mao, Z. D. Zhao
    Abstract:

    The semi-solid slurry of a hypoeutectic Al-Si alloy was manufactured by low superheat pouring and weak Electromagnetic Stirring. The effects of pouring temperature and Stirring power on the semi-solid slurry were investigated. The results indicated that the semi-solid slurry to satisfy rheocasting can be manufactured by low superheat pouring and weak Electromagnetic Stirring. The pouring temperature (or superheat) and the Stirring power remarkably affected the morphology of primary ??-Al and the size of primary ??-Al, and there is no obvious effect of Stirring time on primary ??-Al. Compared with the samples made by low superheat pouring with no Stirring, the nucleation rate, particle morphology and grain size of primary a-Al in A356 were markedly improved by low superheat pouring and weak Electromagnetic Stirring. On the condition of weak Electromagnetic Stirring, the pouring temperature with low superheat can be suitably raised to reach the effectiveness obtained from the lower pouring temperature without Stirring.

Hyouk Chon Kwon - One of the best experts on this subject based on the ideXlab platform.

  • Control of Semi-Solid Microstructure of AZ91D Mg Alloys by the Electromagnetic Stirring
    Solid State Phenomena, 2006
    Co-Authors: Sung Chul Lim, Heung Bok Lee, Kyung Hoon Kim, Hyouk Chon Kwon
    Abstract:

    Most of the work reported at this conference concerned the semi-solid processing of low melting point alloys, and in particular light alloys of aluminum and magnesium. Mg alloys are very attractive as structural materials, because they are the lightest metal among all structural metal materials and excellent specific strength. The purpose of this paper is to develop a semi-solid microstructure of Mg alloys using Electromagnetic Stirring applicable for lighter automobile. The size of primary solid particle and the degree of sphericity as a function of the variation in cooling rate, Stirring speed, and holding time were observed. By applying Electromagnetic Stirring, primary solid particles became finer and rounder relative to as-cast sample. As the input Hz increased from 10Hz to 14Hz, particle size decreased. The size of primary solid particle was found to be decreased with increasing cooling rate. Also, it decreased with Stirring up to 3 minutes but increased above that point. The degree of sphericity became closer to be 1 with hold time. Semi-solid microstructure of Mg alloys, one of the low melting point alloys, could be controlled by Electromagnetic Stirring.

  • The Effect of Electromagnetic Stirring on the Semi-Solid Microstructure of High-Melting Alloys
    Solid State Phenomena, 2006
    Co-Authors: Sung Chul Lim, Heung Bok Lee, Kyung Hoon Kim, Hyouk Chon Kwon
    Abstract:

    Most of the work reported at this conference concerned the semi-solid processing of low melting point alloys, and in particular light alloys of aluminum and magnesium. It also can be true for the higher melting point alloys, such as Cu alloys. The purpose of this paper is to develop a semi-solid microstructure of Cu alloys using Electromagnetic Stirring applicable for squirrel cage rotor of induction motor. The size of primary solid particle and the degree of sphericity as a function of the variation in cooling rate, Stirring speed, and holding time were observed. By applying Electromagnetic Stirring, primary solid particles became finer and rounder relative to as-cast sample. As the input Hz increased from 30Hz to 40Hz, particle size decreased. The size of primary solid particle was found to be decreased with increasing cooling rate. Also, it decreased with Stirring up to 3 minutes but increased above that point. The degree of sphericity became closer to be 1 with hold time. Semi-solid microstructure of Cu alloys, one of the high melting point alloys, could be controlled by Electromagnetic Stirring.

I. Chakrabarty - One of the best experts on this subject based on the ideXlab platform.

  • Effect of rotary Electromagnetic Stirring during solidification of In-situ Al-TiB2 composites
    Materials & Design, 2017
    Co-Authors: Shavi Agrawal, A.k. Ghose, I. Chakrabarty
    Abstract:

    Abstract Al-TiB2 in-situ metal-matrix composite has been synthesized by reaction with commercially pure molten aluminum and potassium hexafluoro titanate (K2TiF6) and potassium tetrafluoro borate (KBF4) adopting stir casting method. Varying amounts of salts based on stoichiometric calculations were added to obtain 0, 5 and 8 wt.% of TiB2 in the composites. The melts were allowed to solidify with or without Electromagnetic Stirring in a rotary magnetic field. The effects of varying percentage of TiB2 reinforcements and magnetic Stirring have been characterized by microstructural evolution and consequent improvement in mechanical properties. The application of rotary Electromagnetic Stirring (EMS) during solidification has shown very prominent effect on the aluminum matrix and the morphology of TiB2 particles and the consequent mechanical properties like hardness, tensile strength, and dry sliding wear resistance.