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Su Hai Hsiang - One of the best experts on this subject based on the ideXlab platform.

  • Using Artificial Neural Networks to Investigate the Influence of Temperature on Hot Extrusion of AZ61 Magnesium Alloy
    Journal of Intelligent Manufacturing, 2006
    Co-Authors: Su Hai Hsiang, Fu-yuan Yang
    Abstract:

    The Hot Extrusion process of magnesium alloy involves many processing parameters, billet temperature is one of the parameters that directly affect the tensile strength of finished product. Hot Extrusion experiments of involving rectangular tubes are conducted at selected billet temperatures of 320, 350, 380 and 400 °C. Artificial neural networks (ANN) analysis then is performed at increments of 10 °C each time between the temperature 320 and 400 °C. Consequently, the magnesium alloy product can be obtained at the optimum tensile strength, as well as the most suitable temperature range for billet heating during Hot Extrusion process. This study mainly explores the relationship between the billet temperature and product tensile strength of the Hot Extrusion of magnesium alloy, and obtains the optimum temperature range through ANN analysis, and analyzes the relationship between the temperature and the tensile strength of a rectangular tube for various Extrusion speeds and Extrusion ratios. Subsequently, experiments are performed to confirm the accuracy of the results by using ANN analysis at different Extrusion speeds and Extrusion ratios. Finally, observing the microstructure enables researchers to acquire the relationship between the sizes of the crystalline grain of the magnesium alloy product at the different formation temperature.

  • Applying ANN to predict the forming load and mechanical property of magnesium alloy under Hot Extrusion
    The International Journal of Advanced Manufacturing Technology, 2005
    Co-Authors: Su Hai Hsiang
    Abstract:

    This study establishes the database concerning magnesium alloy Hot Extrusion, and uses it to conduct various investigations. Firstly, artificial neural networks (ANN) analysis is used to determine the die shapes of various Extrusion ratios. Secondly, the process parameters for the Hot Extrusion of magnesium alloy are determined, and thirdly, the tensile strength and maximum Extrusion load of the finished product are predicted. The database includes 11 parameters, associated with 108 sets of experiment, determined by material type (AZ31 and AZ61), Extrusion ratio (14.41, 35.9 and 55.85), product shape (tubular and sheet), semicone angle of the die (90° and 30°), Extrusion speed, temperature to which the billet is heated, temperature to which the container is heated, lubricant, hold-time at a specified temperature, Extrusion load and tensile strength. ANN is applied to learn from this database, and backward propagation analysis is conducted to find the mechanical properties of the products under various Extrusion ratios. This study adopts the orthogonal array of the Taguchi method to Hot Extrusion experiments that involve dies with different Extrusion ratios, and sets the tensile strength and Extrusion load of the finished product as the quality characteristics, to acquire the optimal parameter condition. Then, based on the results obtained from the additive model, confirmatory experiments are performed. An Analysis of Variance (ANOVA) analysis is then performed to investigate and analyze the influence of factors on the Hot Extrusion process. The weight of important factors in the database is increased, and subsequently, the forming load and mechanical properties of magnesium alloy under Extrusion are accurately predicted.

  • Application of ANN to the Hot Extrusion of magnesium alloy sheets
    The International Journal of Advanced Manufacturing Technology, 2005
    Co-Authors: Su Hai Hsiang
    Abstract:

    During the Hot Extrusion of magnesium alloy, its structure is hexagonal close-packed, which has fewer slide surfaces than aluminium alloy. Experiments show that if the Hot Extrusion of magnesium alloy sheets is performed under a die that has a high Extrusion ratio of 35.9, and a fixed speed is adopted, all of the final products carry defects. Restated, sound sheets with zero-defects cannot be obtained. Further experiments were performed on the Extrusion of magnesium alloy sheets by the multi-speed method (MSM), and sound sheets were obtained. However, when the multi-speed method of extruding was used, adjusting the initial speed at the appropriate time directly affected the results of experiments. This paper addresses an experiment designed by the method of orthogonal array (OA), and uses magnesium alloy AZ31 and AZ61 as outer OAs, whereas the factors selected as inner OAs are the temperature of the container, the temperature of the material, the initial speed of Extrusion, the final speed and the lubricant. Moreover, the OA of L_18 is selected to conduct experiments repeatedly and then apply artificial neural networks (ANN) to learn the results of the experiment. To forecast the temperature of the material for an experiment between 340 and 390 °C, curves of the timing of an adjustment of the initial speed of Extrusion by the multi-speed method with increments of 5 °C should be plotted. Experiments are performed to confirm the accuracy of ANN analysis.

  • an investigation on the Hot Extrusion process of magnesium alloy sheet
    Journal of Materials Processing Technology, 2003
    Co-Authors: Su Hai Hsiang
    Abstract:

    Abstract This study investigates the Hot Extrusion of magnesium alloy sheets at various temperatures, material, speed and lubricant. A multi-speed method is applied to extrude a magnesium alloy sheet at a high Extrusion ratio. The experimental results are analyzed to optimize the processing conditions, increase the tensile strength and reduce the Extrusion load on the magnesium alloy thin sheet. Nowadays, most magnesium alloy products are manufactured by industrial die casting. Hot Extrusion is seldom used to finish magnesium products because the Extrusion speed, temperature and Extrusion load significantly effect the properties of the product. In this study, the Taguchi experimental method with the orthogonal array is applied. ANOVA is used to investigate how parameters affect the Extrusion process. All possible mechanical properties of the product are analyzed to obtain the optimal process parameters. In addition, magnesium alloys with different compositions are experimentally tested to determine the mechanical properties of the extruded product and obtain the relationship between the process parameters and the properties of the material.

  • An investigation on the Hot Extrusion process of magnesium alloy sheet
    Journal of Materials Processing Technology, 2003
    Co-Authors: Su Hai Hsiang, Jer Liang Kuo
    Abstract:

    This study investigates the Hot Extrusion of magnesium alloy sheets at various temperatures, material, speed and lubricant. A multi-speed method is applied to extrude a magnesium alloy sheet at a high Extrusion ratio. The experimental results are analyzed to optimize the processing conditions, increase the tensile strength and reduce the Extrusion load on the magnesium alloy thin sheet. Nowadays, most magnesium alloy products are manufactured by industrial die casting. Hot Extrusion is seldom used to finish magnesium products because the Extrusion speed, temperature and Extrusion load significantly effect the properties of the product. In this study, the Taguchi experimental method with the orthogonal array is applied. ANOVA is used to investigate how parameters affect the Extrusion process. All possible mechanical properties of the product are analyzed to obtain the optimal process parameters. In addition, magnesium alloys with different compositions are experimentally tested to determine the mechanical properties of the extruded product and obtain the relationship between the process parameters and the properties of the material. © 2003 Elsevier B.V. All rights reserved.

L Y Sheng - One of the best experts on this subject based on the ideXlab platform.

  • microstructure evolution and mechanical properties of ni3al al2o3 composite during self propagation high temperature synthesis and Hot Extrusion
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2012
    Co-Authors: L Y Sheng, Fan Yang, T F Xi, H Q Ye
    Abstract:

    The Ni3Al/Al2O3 composite was fabricated by self-propagation high-temperature synthesis with and without Hot Extrusion methods. Its microstructure and mechanical properties were investigated by using combination of optical microscope, transmission electron microscope and compression test. The results show that the Ni3Al/Al2O3 composite without Hot Extrusion has relative coarse microstructure, which contains gamma-Ni and Ni3Al3 phases along the Ni3Al phase boundary. In addition, kappa-Al2O3, theta-Al2O3, alpha-Al2O3 and cavities are observed in the composite without Hot Extrusion, which segregate greatly in original powder boundary. The Hot Extrusion process densifies the composite; eliminates the element segregation and redistributes Al2O3 particles homogeneously. Moreover fine Ni3Al crystalline with high density of dislocations and twinned Ni3Al crystals are observed in the extruded part. The Hot Extrusion improves the mechanical properties of the Ni3Al/Al2O3 composite significantly, especially its ductility. (C) 2012 Elsevier BM. All rights reserved.

Yabo Fu - One of the best experts on this subject based on the ideXlab platform.

  • strengthening behavior of in situ synthesized tic tib ti composites by powder metallurgy and Hot Extrusion
    Materials & Design, 2016
    Co-Authors: Shufeng Li, Katsuyoshi Kondoh, Hisashi Imai, Biao Chen, Junko Umeda, Yabo Fu
    Abstract:

    Abstract Titanium matrix composites (TMCs) reinforced with in situ -formed TiC particles and TiB whiskers were prepared by reacting titanium and B 4 C via powder metallurgy and Hot Extrusion. The effect of the in situ -formed TiC–TiB hybrid reinforcements on the microstructure and mechanical behavior of the TMCs was investigated. TiB whiskers exhibited favorable alignment, orienting parallel to the deformation axis after Hot Extrusion, while TiC particles and TiB whiskers were distributed homogenously throughout the extruded composites. The synthesized TMCs with a 13.6% volume fraction of TiC–TiB hybrid reinforcements presented a σ UTS of 1138 MPa, representing a 74% improvement compared to pure titanium, and retained an acceptable elongation of 2.6%. The synergistic strengthening effect of TiC particles and TiB whiskers was investigated via in situ tensile observations based on the load-transfer mechanism between the titanium matrix and TiC–TiB reinforcements.

H Q Ye - One of the best experts on this subject based on the ideXlab platform.

  • microstructure evolution and mechanical properties of ni3al al2o3 composite during self propagation high temperature synthesis and Hot Extrusion
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2012
    Co-Authors: L Y Sheng, Fan Yang, T F Xi, H Q Ye
    Abstract:

    The Ni3Al/Al2O3 composite was fabricated by self-propagation high-temperature synthesis with and without Hot Extrusion methods. Its microstructure and mechanical properties were investigated by using combination of optical microscope, transmission electron microscope and compression test. The results show that the Ni3Al/Al2O3 composite without Hot Extrusion has relative coarse microstructure, which contains gamma-Ni and Ni3Al3 phases along the Ni3Al phase boundary. In addition, kappa-Al2O3, theta-Al2O3, alpha-Al2O3 and cavities are observed in the composite without Hot Extrusion, which segregate greatly in original powder boundary. The Hot Extrusion process densifies the composite; eliminates the element segregation and redistributes Al2O3 particles homogeneously. Moreover fine Ni3Al crystalline with high density of dislocations and twinned Ni3Al crystals are observed in the extruded part. The Hot Extrusion improves the mechanical properties of the Ni3Al/Al2O3 composite significantly, especially its ductility. (C) 2012 Elsevier BM. All rights reserved.

M.a. Martinez - One of the best experts on this subject based on the ideXlab platform.

  • recycling of aluminium alloy and aluminium matrix composite chips by pressing and Hot Extrusion
    Journal of Materials Processing Technology, 2003
    Co-Authors: J B Fogagnolo, M. A. Simon, E M Ruiznavas, M.a. Martinez
    Abstract:

    Abstract A method for recycling aluminium alloy chips by cold and Hot pressing followed by Hot Extrusion was studied as well as the possibility of using this method to recycle aluminium matrix composite chips. Hot Extrusion of cold or Hot pressed samples could satisfactorily promote the consolidation of the chips. Hot Extrusion of Hot pressed samples proved to be the best route, from the point of view of mechanical properties, but, on the other hand, Hot Extrusion of cold pressed samples route has higher cost profit. Aluminium AA6061 matrix composite reinforced with Al2O3 recycled by cold pressing and Hot Extrusion was compared with the primary material produced by conventional casting process from which the chips were obtained. Due to the refinement of the microstructure and the dispersion of the aluminium oxide caused by the Extrusion process, the ultimate tensile strength (UTS) and the hardness were higher for the recycled material than for the former composite.