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  • Trans Tech Publications, Ltd.  (8)
  • Jiang, Ju Fu  (8)
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  • Trans Tech Publications, Ltd.  (8)
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  • 1
    Online Resource
    Online Resource
    Research on Fabrication and Semisolid Processing of Semisolid Slurries of 7075 Aluminum Matrix Composites Reinforced with Nano-Sized SiC Particles
    Trans Tech Publications, Ltd. ; 2016
    In:  Solid State Phenomena Vol. 256 ( 2016-9), p. 81-87
    Details
    In: Solid State Phenomena, Trans Tech Publications, Ltd., Vol. 256 ( 2016-9), p. 81-87
    Abstract: Semisolid slurries of 7075 aluminum matrix composite reinforced with nano-sized SiC particles were fabricated by ultrasonic assisted semisolid stirring (UASS) method. Rheoforming and thixoforming of typical cylindrical parts were investigated. The results show that high-quality semisolid slurries with spheroidal solid grain of 38 µm were fabricated by UASS. The nano-sized SiC particles were dispersed uniformly due to transient cavitation and acoustic streaming of ultrasonic wave and high and controllable viscosity of semisolid slurry. Typical cylindrical composite parts with good surface quality and complete filling were rheoformed and thixoformed successfully. Ultimate tensile strength (UTS) of the rheoformed and thixoformed composite parts are enhanced due to addition of nano-sized SiC particles. However, elongation decreased as compared to those of the matrix parts. Maximum UTS of 550 MPa was achieved in the thixoformed composite part with T6 treatment. Increase of dislocation density around the reinforcement particles leads to improvement of the strength and wear resistance of the composite.
    Type of Medium: Online Resource
    ISSN: 1662-9779
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/SSP.256
    DOI: 10.4028/www.scientific.net/SSP.256.81
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2016
    detail.hit.zdb_id: 2051138-3
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  • 2
    Online Resource
    Online Resource
    Microstructural Evolution of 7050 Aluminum Alloy Semisolid Billets Fabricated by RAP Process
    Trans Tech Publications, Ltd. ; 2014
    In:  Solid State Phenomena Vol. 217-218 ( 2014-9), p. 29-36
    Details
    In: Solid State Phenomena, Trans Tech Publications, Ltd., Vol. 217-218 ( 2014-9), p. 29-36
    Abstract: In the present study, 7050 supplied in extruded state was heated to different temperatures below solidus or the semisolid state and microstructural evolution and coarsening were investigated. The results showed that complete recrystallisation only occurs after soaking for 5 minutes at 545°C, which is characterised by formation of a lot of fine equiaxed grains. RAP is suitable for fabricating high-quality semisolid billet of 7050 aluminum alloy with an average grain size ranging from 47.4 um to 70.5 um and a roundness ranging from 1.3 to 1.7. Grain growth occurs as the samples were soaked at 610°C and 615°Cfor prolonged soaking time. When the isothermal temperatures were 610°C and 615°C, the coarsening rate constants were 359.5μm3s-1 and 470.5μm3s-1, respectively, indicating an increase of coarsening rate constant (K) with the increasing isothermal temperature. Coarsening tends to occur via Ostwald ripening and coalescence. Ostwald ripening plays an important role during the whole coarsening process, but the grain coalescence only contributes to coarsening after soaking for 12 minutes. 625°C is an optimal temperature to keep cylinder shape of the sample due to collapse of the sample above this temperature, leading to difficult clamping.
    Type of Medium: Online Resource
    ISSN: 1662-9779
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/SSP.217-218
    DOI: 10.4028/www.scientific.net/SSP.217-218.29
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2014
    detail.hit.zdb_id: 2051138-3
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  • 3
    Online Resource
    Online Resource
    Mechanical Behavior of Processed AZ91D by Equal Channel Angular Extrusion during Semi-Solid Isothermal Compression
    Trans Tech Publications, Ltd. ; 2006
    In:  Solid State Phenomena Vol. 116-117 ( 2006-10), p. 530-533
    Details
    In: Solid State Phenomena, Trans Tech Publications, Ltd., Vol. 116-117 ( 2006-10), p. 530-533
    Abstract: Mechanical behavior of processed AZ91D magnesium alloy by equal channel angular extrusion during semi-solid isothermal compression was investigated using semi-solid isothermal compression test. The results show that there are four stages, drastic increase of true stress, drastic falling of true stress, steady stage and increase of true stress. With the increase of holding time or deformation temperature, required true stress for obtaining same true strain falls evidently and peak stress and steady stress also fall in true stress-strain curve. With increasing strain rate, steady stress also increase. Peak stress will increase or decrease with the sudden increase or fall of strain rate. During semi-solid isothermal compression, plastic deformation of semi-solid billet mainly depends on plastic deformation of solid phases and their rotation and sliding. Coarse grains occur in upper position adjacent to compression die’s surface and fine grains occur in the central and free surface positions of billets.
    Type of Medium: Online Resource
    ISSN: 1662-9779
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/SSP.116-117
    DOI: 10.4028/www.scientific.net/SSP.116-117.530
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2006
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  • 4
    Online Resource
    Online Resource
    Microstructure and Stress Variation of Semi-Solid Magnesium Alloy during Isothermal Compression and Its Relationship to Thixotropy
    Trans Tech Publications, Ltd. ; 2006
    In:  Solid State Phenomena Vol. 116-117 ( 2006-10), p. 643-647
    Details
    In: Solid State Phenomena, Trans Tech Publications, Ltd., Vol. 116-117 ( 2006-10), p. 643-647
    Abstract: Thixotropy is the most important characteristic of semi-solid materials, and it is decided by the variation of microstructure during action of handling. In this paper, for the sake of the industrial thixoforming and numerical simulation, microstructure and stress variation of semisolid magnesium alloys during isothermal compression is researched. Here, samples are heated to the desired temperature in the empty space with various holding times and compressed horizontally. Stress–strain curves during compression can be given directly by the experimental computer, and each of curves show a peak stress in a small strain and then decrease rapidly, which originally because of the thixotropy of semisolid materials. Moreover, thixotropy of semisolid magnesium alloys is clearer with the evolution of microstructures including agglomeration and deagglomeration of solid particles and the moving way of liquid at different places and strain under different conditions. Microstructures during isothermal compression show that the deagglomeration of solid particles increase with increasing the strain rate, therefore, the thixotropy of semisolid magnesium alloys increases. However, when solid volume fractions are lower, the agglomeration of solid particles doesn’t change obviously with increase or decrease factors, meaning that the thixotropy is smaller. Relationships between thixotropy and microstructure at other different conditions are also given according to the experiments and analysis.
    Type of Medium: Online Resource
    ISSN: 1662-9779
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/SSP.116-117
    DOI: 10.4028/www.scientific.net/SSP.116-117.643
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2006
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  • 5
    Online Resource
    Online Resource
    Microstructure Evolution of AZ91D Magnesium Alloy Semi-solid Billets Prepared by a New SIMA Method
    Trans Tech Publications, Ltd. ; 2006
    In:  Solid State Phenomena Vol. 116-117 ( 2006-10), p. 132-135
    Details
    In: Solid State Phenomena, Trans Tech Publications, Ltd., Vol. 116-117 ( 2006-10), p. 132-135
    Abstract: By using equal channel angular extrusion (ECAE) as strain induced step in strain induced melt activated (SIMA) and completing melt activated step by using semi-solid isothermal treatment, a new SIMA method is introduced firstly. The results show that semi-solid billet with highly spheroidal and homogeneous grains with the average grain size of 20μm can be prepared by new SIMA method. High mechanical properties, such as ultimate tensile strength of 321.8MPa and elongation of 15.2% are obtained in magazine plate components thixoforged using semi-solid billet prepared by new SIMA.
    Type of Medium: Online Resource
    ISSN: 1662-9779
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/SSP.116-117
    DOI: 10.4028/www.scientific.net/SSP.116-117.132
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2006
    detail.hit.zdb_id: 2051138-3
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  • 6
    Online Resource
    Online Resource
    Research on Thixoforging Magazine Plate of AZ91D Magnesium Alloy in Semi-Solid State
    Trans Tech Publications, Ltd. ; 2006
    In:  Solid State Phenomena Vol. 116-117 ( 2006-10), p. 267-270
    Details
    In: Solid State Phenomena, Trans Tech Publications, Ltd., Vol. 116-117 ( 2006-10), p. 267-270
    Abstract: The thixoforging process in which magazine plates of AZ91D magnesium alloy were thixoforged in semi-solid state using semi-solid billets prepared by common SIMA method and new SIMA method was investigated. The results show that the pressure has a great influence on the semi-solid billet’s ability to fill die’s cavity. When the pressure is 500KN, the semi-solid billet can’t fill the die’s cavity completely. When the pressure is 2000KN, the semi-solid billet can fill the die’s cavity completely. Room temperature mechanical properties, such as yield strength of 201.4MPa, ultimate tensile strength of 321.8MPa and elongation of 15.3%, can be obtained successfully when the technological parameters, including pressure of 200KN, die preheating temperature of 723K, holding for 20min at 818K, are satisfied. Comparing with common SIMA, mechanical properties of room temperature and high temperature at 373Kare enhanced heavily.
    Type of Medium: Online Resource
    ISSN: 1662-9779
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/SSP.116-117
    DOI: 10.4028/www.scientific.net/SSP.116-117.267
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2006
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  • 7
    Online Resource
    Online Resource
    Research Progress of Semi-Solid Processing in China
    Trans Tech Publications, Ltd. ; 2006
    In:  Solid State Phenomena Vol. 116-117 ( 2006-10), p. 149-154
    Details
    In: Solid State Phenomena, Trans Tech Publications, Ltd., Vol. 116-117 ( 2006-10), p. 149-154
    Abstract: There have been five academic conferences organized by the chairman of semi-solid processing academic committee, Prof. Shoujing Luo, in China since 2000. Based on the achievements of the five academic conferences, six aspects of research progress of semi-solid processing in China will be discussed here by the authors, which includes the research on fundamental theories of semi-solid processing, that is, theories of high-pressure solidification, plastic deformation densification and rheological filling; the research on technological theories of semi-solid processing, that is, theories of preparation of semi-solid slurries or billets and their spheroidization, theories of thixoforging and controlling of technological parameters, theories of double controlling of semi-solid die casting and semi-solid die forging and their numerical simulation; the research on characterization of semi-solid metal and their design; the application present status and potential prediction of semi-solid processing; present status of academic organization, academic communication and cultivating persons and the differences between the other countries and China. The research results show that China is a large country for metal processing, but China isn’t a strong in metal processing. As with other processing technologies, under the support the government foundations and other funds, more research work should be done in semi-solid processing and originality innovation and key technologies on preparation semi-solid slurries or billets and forming must be completely successfully in order to improve the competitive powder of semi-solid processing. It is should be noted that semi-solid processi ng will become a important forming method of simple, high efficient, low cost and good quality in the fields of materials processing.
    Type of Medium: Online Resource
    ISSN: 1662-9779
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/SSP.116-117
    DOI: 10.4028/www.scientific.net/SSP.116-117.149
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2006
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  • 8
    Online Resource
    Online Resource
    Numerical Simulation of Thixoforging of an AZ91D Magnesium Alloy Magazine Plate and Experimental Validation
    Trans Tech Publications, Ltd. ; 2008
    In:  Solid State Phenomena Vol. 141-143 ( 2008-7), p. 623-628
    Details
    In: Solid State Phenomena, Trans Tech Publications, Ltd., Vol. 141-143 ( 2008-7), p. 623-628
    Abstract: In this paper, thixoforging of a magazine plate made of AZ91D magnesium alloy were investigated by means of numerical simulation and experiments. Numerical simulation results show that with increasing punch displacement, local bending, formation of a concave shell part and bulk plastic deformation occurs in billet continuously. Equivalent strain and stress increase and the temperature of the semi-solid billet decreases. When the temperature of the semi-solid billet or the die temperature is elevated, equivalent stain and stress decrease. Optimal technological parameters such as a billet temperature of 545°C, die temperature of 450°C and punch velocity of 15 mm/s were obtained by numerical simulation. Experimental results demonstrate that magazine plates with high mechanical properties such as tensile strength of 316.8 MPa, yield strength of 228.3 MPa and elongation of 12.6 % can be manufactured successfully when the optimal technological parameters selected according to the results of numerical simulation are applied.
    Type of Medium: Online Resource
    ISSN: 1662-9779
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/SSP.141-143
    DOI: 10.4028/www.scientific.net/SSP.141-143.623
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2008
    detail.hit.zdb_id: 2051138-3
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