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T J Chen - One of the best experts on this subject based on the ideXlab platform.
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Effects of Mould Temperature on microstructure and tensile properties of thixoforged Mg2Sip/AM60B in-situ composites
Journal of Alloys and Compounds, 2016Co-Authors: Su-qing Zhang, T J Chen, Fa-liang Cheng, Lan LiAbstract:Abstract The effects of Mould Temperature on microstructure and tensile properties of thixoforged in-situ Mg 2 Si p /AM60B composites have been investigated. The results indicate that the Mould Temperature affects the secondary solidification behavior and thus the compactness of the secondary solidified structures, solubility of Al in α-Mg particles, β phase size and amount, plastic deformation and recrystallization during thixoforging through changing solidification rate, and finally the tensile properties. Correspondingly, the fracture mode also changes with the Temperature. In comparison with thixoforged AM60B alloy, the UTS of thixoforged composite increases 35.6% due to the reinforcement of Mg 2 Si particles. The strengthening mechanism of Mg 2 Si particles is an additive or synergetic effect combining the load transfer mechanism, the Orowan looping mechanism and dislocation strengthening mechanism.
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effects of Mould Temperature and grain refiner amount on microstructure and tensile properties of thixoforged az63 magnesium alloy
Journal of Alloys and Compounds, 2013Co-Authors: T J Chen, L K Huang, Xiao Feng HuangAbstract:Abstract The effects of Mould Temperature and addition amount of MgCO 3 refiner on the microstructure and tensile properties of thixoforged AZ63 alloy have been investigated. The results indicated that both the Mould Temperature and addition amount of MgCO 3 refiner have large effects on the microstructure and tensile properties of the thixoforged AZ63 alloy. The Mould Temperature affects the solidification behavior, plastic deformation and recrystallization during thixoforging through changing solidification rate. But the effects of the refiner are realized through altering the morphology and size of primary α-Mg particles and the Al content of liquid phase. Generally, high Mould Temperature or high refiner addition amount are beneficial for obtaining a compact microstructure with uniform deformation, and thus for improving tensile properties. The properties with ultimate tensile strength of 310 MPa and elongation of 10.7% can be obtained using the thixoforging. Crack propagation path during tensile testing changes from completely or partially along the secondarily solidified structures between the primary particles to completely across the α-Mg particles as the Temperature or the refiner addition amount increases. Work hardening from the plastic deformation plays an important role for the tensile properties and this effect also varies with the Temperature or the refiner amount. A new technology has been developed for producing AZ63 alloy components with uniform and small grains.
Xiao Feng Huang - One of the best experts on this subject based on the ideXlab platform.
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effects of Mould Temperature and grain refiner amount on microstructure and tensile properties of thixoforged az63 magnesium alloy
Journal of Alloys and Compounds, 2013Co-Authors: T J Chen, L K Huang, Xiao Feng HuangAbstract:Abstract The effects of Mould Temperature and addition amount of MgCO 3 refiner on the microstructure and tensile properties of thixoforged AZ63 alloy have been investigated. The results indicated that both the Mould Temperature and addition amount of MgCO 3 refiner have large effects on the microstructure and tensile properties of the thixoforged AZ63 alloy. The Mould Temperature affects the solidification behavior, plastic deformation and recrystallization during thixoforging through changing solidification rate. But the effects of the refiner are realized through altering the morphology and size of primary α-Mg particles and the Al content of liquid phase. Generally, high Mould Temperature or high refiner addition amount are beneficial for obtaining a compact microstructure with uniform deformation, and thus for improving tensile properties. The properties with ultimate tensile strength of 310 MPa and elongation of 10.7% can be obtained using the thixoforging. Crack propagation path during tensile testing changes from completely or partially along the secondarily solidified structures between the primary particles to completely across the α-Mg particles as the Temperature or the refiner addition amount increases. Work hardening from the plastic deformation plays an important role for the tensile properties and this effect also varies with the Temperature or the refiner amount. A new technology has been developed for producing AZ63 alloy components with uniform and small grains.
Adrian Murphy - One of the best experts on this subject based on the ideXlab platform.
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Experimental investigation of thermoforming carbon fibre-reinforced polyphenylene sulphide composites
Journal of Thermoplastic Composite Materials, 2013Co-Authors: Joseph Butterfield, Mark Price, Saul Buchanan, Adrian MurphyAbstract:Pre-consolidated carbon fibre-reinforced polyphenylene sulphide (CF/PPS) laminates were thermoformed into V-shaped parts via designed out of autoclave thermoforming experiments. The different processing conditions tested in the experiment have resulted in final part angles whose differences ranged from 2.087 to 3.431° from the original Mould angle. The test results show that processing conditions influenced finished part dimensions as the final sample angles were found to decrease relative to the tooling dimensions, as Mould Temperature increases. Higher Mould Temperature conditions produce thinner parts due to the thermal expansion of Mould tools. The Mould Temperature of 170°C, which can produce parts with high degree of crystallinity as well as small size of crystal, has been established as the optimal thermoforming condition for CF/PPS composites.
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The Theoretical Prediction of Thermoformed Carbon Fibre Reinforced Thermoplastic Materials in Support of Optimal Process Design.
11th AIAA Aviation Technology Integration and Operations (ATIO) Conference, 2011Co-Authors: Joseph Butterfield, Mark Price, Adrian MurphyAbstract:thermoforming process. The model is intended to support a virtual approach to understanding process capability. This in turn will increase the utility of digital manufacturing methods by enabling the use of more realistic part forms in product and process design. A typical V-shape carbon fibre reinforced polyphenylene sulfide (PPS) composite part was selected as the demonstrator. A custom built thermoforming cell was used to manufacture a series of samples to investigate the process-induced shape variation of the part based on a range of tooling Temperatures during cooling. It was found that the influence of Mould Temperature on the deformation is more dependent on the composite’s thermal properties. After de-Moulding, the part deforms because of the thermal and crystallization shrinkage during the cooling from Mould Temperature to room Temperature. For the same ply orientation, the final bend angles decrease with increasing Mould Temperature. The processing conditions were then used as the basis of a theoretical model designed to predict the final part angle. The theoretical model was developed according to basic equilibrium, compatibility, and constitutive equations. The displacement model was supplemented with boundary and continuity conditions to solve final laminate deformations. In the constitutive model, thermal and crystallization shrinkage strains are considered because of semi-crystalline and very low moisture absorption properties of PPS. The stiffness matrix is considered as Temperature dependent as the behaviour of PPS is highly Temperature dependant. The largest difference between experimental and predicted results was 16.26% for the sample formed at the 170°C Mould Temperature whereas the calculation outcome for the sample formed with 110°C Mould was within 1.44% of the experimental result. The calculations show that composite part deformation is dominated by Temperature change induced anisotropic thermal strains.
Xuedong Ling - One of the best experts on this subject based on the ideXlab platform.
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centrifugal casting processes of manufacturing in situ functionally gradient composite materials of al 19si 5mg alloy
Rare Metals, 2009Co-Authors: Yan bo ZHAI, Kai Wang, Xuedong LingAbstract:Cylindrical components of in situ functionally gradient composite materials of Al-19Si-5Mg alloy were manufactured by centrifugal casting. Microstructure characteristics of the manufactured components were observed and the effects of the used process factors on these characteristics were analyzed. The results of observations shows that, in thickness, the components possess microstructures accumulating lots of Mg2Si particles and a portion of primary silicon particles in the inner layer, a little Mg2Si and primary silicon particles in the outer layer, and without any Mg2Si and primary silicon particle in the middle layer. The results of the analysis indicate that the rotation rate of centrifugal casting, Mould Temperature, and melt pouring Temperature have evidently affected the accumulation of the second phase particles. Also, the higher the centrifugal rotation rate, Mould Temperature, and melt pouring Temperature are, the more evident in the inner layer the degree of accumulation of Mg2Si and primary silicon particles is.
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Centrifugal casting processes of manufacturing in situ functionally gradient composite materials of Al-19Si-5Mg alloy
2009Co-Authors: Yong Xie, Chang ming LIU, Yan bo ZHAI, Kai-ming Wang, Xuedong LingAbstract:Cylindrical components of in situ functionally gradient composite materials of Al-19Si-5Mg alloy were manufactured by centrifugal casting. Microstructure characteristics of the manufactured components were observed and the effects of the used process factors on these characteristics were analyzed. The results of observations shows that, in thickness, the components possess microstructures accumulating lots of Mg2Si particles and a portion of primary silicon particles in the inner layer, a little Mg2Si and primary silicon particles in the outer layer, and without any Mg2Si and primary silicon particle in the middle layer. The results of the analysis indicate that the rotation rate of centrifugal casting, Mould Temperature, and melt pouring Temperature have evidently affected the accumulation of the second phase particles. Also, the higher the centrifugal rotation rate, Mould Temperature, and melt pouring Temperature are, the more evident in the inner layer the degree of accumulation of Mg2Si and primary silicon particles is. © 2009 Journal Publishing Center of University of Science and Technology Beijing and Springer-Verlag GmbH.
Chang-seog Kang - One of the best experts on this subject based on the ideXlab platform.
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Effect of morphology and precipitation of Si phase on thermal properties of Al–Si–Mg–Cu foundry alloy
Journal of Thermal Analysis and Calorimetry, 2019Co-Authors: Se-weon Choi, Chang-seog KangAbstract:The objective of this study was to investigate effects of morphology and precipitation on thermal properties of Al-9.8%Si-0.4%Mg-0.7%Cu (in mass%) alloys using a laser flash apparatus, differential scanning calorimetry, and a thermomechanical analyser. Results revealed that mean particle size and shape of Si depended on Mould Temperature. Specimens with higher Mould Temperature had long and needle-like eutectic Si. As-cast specimens were solid solution treated at 535 °C for 6 h and then quenched in warm water of 80 °C. As-solution specimens were then aged at 180 or 190 °C for 1, 5, and 10 h. After artificial ageing treatment, the long needle-like eutectic silicon phase was split into smaller particles. It then gradually became spherical. When the shape of Si phase became similar after artificial ageing treatment, thermal diffusivity and thermal conductivity had similar values. It was found that shape change of Si particles greatly influenced thermal diffusivity and thermal conductivity.