The Experts below are selected from a list of 353178 Experts worldwide ranked by ideXlab platform
Edward E Parry - One of the best experts on this subject based on the ideXlab platform.
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diametral tensile strength and compressive strength of a calcium phosphate cement effect of Applied Pressure
Journal of Biomedical Materials Research, 2000Co-Authors: Laurence C Chow, Satoshi Hirayama, Shozo Takagi, Edward E ParryAbstract:The diametral tensile strength (DTS) and compressive strength (CS) of a calcium phosphate cement comprised of tetracalcium phosphate and dicalcium phosphate anhydrous were studied. Cement powder and water were mixed at a powder/liquid ratio of 4.0. The resulting cement pastes were placed in molds and a Pressure ranging from 0–2.8 MPa was Applied for various lengths of time (0.5–24 h). DTS and CS measurements were conducted on 24-h wet samples. The strength was found to be significantly (p < 0.05) affected by the Pressure but not by the time. Samples prepared under a Pressure of 0.7 MPa had a mean DTS value of 10.8 ± 1.0 MPa (n = 5), which is comparable to the values reported in the literature for the same cement prepared under similar conditions. In contrast, the mean CS value obtained in the present study, 66.1 ± 5.0 MPa (n = 5), was significantly higher than the value (51 ± 4.5 MPa) previously reported. The higher CS may be attributed to an improved mold design that may reduce sample damage during demolding, and to the use of a loading device that Applied a constant Pressure to the sample during setting. The average standard deviation of the mean for the 19 DTS sample groups (n = 5 in each group) was 1.1 MPa, corresponding to 9.6% of the mean DTS value. The average standard deviation of the 7 CS sample groups (n = 5 in each group) was 4.5 MPa, corresponding to 7.1% of the mean CS value. Published 2000 John Wiley & Sons, Inc. J Biomed Mater Res (Appl Biomater) 53: 511–517, 2000
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diametral tensile strength and compressive strength of a calcium phosphate cement effect of Applied Pressure
Journal of Biomedical Materials Research, 2000Co-Authors: Laurence C Chow, Satoshi Hirayama, Shozo Takagi, Edward E ParryAbstract:The diametral tensile strength (DTS) and compressive strength (CS) of a calcium phosphate cement comprised of tetracalcium phosphate and dicalcium phosphate anhydrous were studied. Cement powder and water were mixed at a powder/liquid ratio of 4.0. The resulting cement pastes were placed in molds and a Pressure ranging from 0-2.8 MPa was Applied for various lengths of time (0.5-24 h). DTS and CS measurements were conducted on 24-h wet samples. The strength was found to be significantly (p<0.05) affected by the Pressure but not by the time. Samples prepared under a Pressure of 0.7 MPa had a mean DTS value of 10.8+/-1.0 MPa (n = 5), which is comparable to the values reported in the literature for the same cement prepared under similar conditions. In contrast, the mean CS value obtained in the present study, 66.1+/-5.0 MPa (n = 5), was significantly higher than the value (51+/-4.5 MPa) previously reported. The higher CS may be attributed to an improved mold design that may reduce sample damage during demolding, and to the use of a loading device that Applied a constant Pressure to the sample during setting. The average standard deviation of the mean for the 19 DTS sample groups (n = 5 in each group) was 1.1 MPa, corresponding to 9.6% of the mean DTS value. The average standard deviation of the 7 CS sample groups (n = 5 in each group) was 4.5 MPa, corresponding to 7.1% of the mean CS value. Published 2000 John Wiley & Sons, Inc.
Wenjiang Ding - One of the best experts on this subject based on the ideXlab platform.
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an investigation into interface formation and mechanical properties of aluminum copper bimetal by squeeze casting
Materials & Design, 2016Co-Authors: Qudong Wang, Qigui Wang, Wenjiang DingAbstract:Abstract Aluminum–copper bimetal was prepared by compound casting liquid aluminum onto copper bars and solidifying under Applied Pressure. The effect of pouring temperature and Applied Pressure on microstructure and mechanical and electrical properties of the bimetal was investigated. Bonding mechanism and mechanical and electrical behaviors of bimetal were analyzed. Sound metallurgical bonding could be achieved by applying thermal spray zinc coating onto Cu inserts and carefully controlling the squeeze casting process. The results showed that interfacial reactions between liquid Al and solid Cu lead to the formation of transition zone, four possible layers, Al4Cu9 layer, Al2Cu layer, Al–Cu eutectic layer and Cu rich Al solid solution layer were identified in the transition zone. The thickness of each layer varies with the variation of pouring temperature and Applied Pressure. The formation of inherent defects and thickening of intermetallic compound promotes cracks propagation and weakens the bonding strength, hinders current flowing through and weakens the electrical property. The bimetal made at pouring temperature of 700 °C gives the best mechanical and electrical properties.
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an investigation into aluminum aluminum bimetal fabrication by squeeze casting
Materials & Design, 2015Co-Authors: Qudong Wang, Qigui Wang, Wenjiang DingAbstract:Abstract Aluminum–aluminum bimetal were prepared by casting liquid A356 aluminum alloy onto 6101 aluminum extrusion bars and solidifying under Applied Pressure. The effect of surface treatment, pouring temperature and Applied Pressure on microstructure and mechanical properties of the bimetal was investigated. The results showed that sound metallic bonding could be produced by electro-plating the solid 6101 aluminum alloy with a layer of zinc coating and carefully controlling the casting temperature. With the application of Pressure during solidification process, the tensile strength exhibited more promising results than that made by gravity casting, for both A356 aluminum alloy matrix and bimetal. However, with the increase of Applied Pressure, A356 aluminum alloy matrix and bimetal showed different behaviors. For A356 aluminum alloy matrix, the tensile strength increased with the increase of Applied Pressure, for bimetal it appeared to be independent on the magnitude of the Applied Pressure and the value remained steady. The fracture analysis indicated that during the tensile test of bimetal, the crack initiation began with initial fracture of eutectic Si in the transition zone then extended in the transition zone. The tensile strength of the bimetal fabricated by squeeze casting method was improved by about 10%, from 145 MPa to 155 MPa, as compared with that made by gravity casting. The process presented in this study provides a promising and effective approach to create a metallic bonding between an aluminum insert and various aluminum melts to develop advanced functional and structural materials.
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effects of processing parameters and ca content on microstructure and mechanical properties of squeeze casting az91 ca alloys
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2014Co-Authors: Yang Zhang, Song Pang, Yingdong Wang, Wencai Liu, Liang Zhang, Wenjiang DingAbstract:Abstract AZ91–(1–3 wt%) Ca alloys were prepared by direct squeeze casting, in which the melt was solidified under Applied Pressure. The effects of processing parameters (such as Applied Pressure and pouring temperature) and Ca content on microstructure and mechanical properties of squeeze casting AZ91–Ca alloys were investigated. The results indicate that the microstructure was refined with the increase of Applied Pressure, and the mechanical properties were improved. When the pouring temperature was lowered down to near the liquidus, the microstructure was further refined and α-Mg grains turned rosette-like. The negative effect on ambient temperature mechanical properties caused by the addition of Ca into AZ91 alloy was inhibited by squeeze casting. Compared to conventional casting, squeeze casting process can offer AZ91–Ca alloys better mechanical properties, especially in elongation to failure (Ef).
A R Mirhabibi - One of the best experts on this subject based on the ideXlab platform.
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the effect of Applied Pressure on fracture surface and tensile properties of nickel coated continuous carbon fiber reinforced aluminum composites fabricated by squeeze casting
Materials & Design, 2010Co-Authors: E Hajjari, Mohammad Divandari, A R MirhabibiAbstract:Composite specimens were consolidated using squeeze casting method under 30, 50 and 70 MPa Applied Pressures. Nickel coated polyacrylonitrile (PAN) based carbon fibers with a mean volume fraction of about 20% were used as reinforcement and the effect of Applied Pressure and coating layer were evaluated by studying the microstructure, fracture surface and tensile properties of the composite samples. The results indicate that presence of nickel coating on the carbon fibers improves the tensile strength of the composites, significantly. This seems to be the result of the effect of nickel layer on improving the wettability and also protecting the fibers against reaction with liquid aluminum during processing the composite. The appropriate Applied Pressure for preparing the composite samples was achieved to be about 30 MPa. Higher Pressures demonstrated damage in distribution of the fibers and also caused separation of nickel coating layer.
Qigui Wang - One of the best experts on this subject based on the ideXlab platform.
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microstructure and mechanical properties of overcast 6101 6101 wrought al alloy joint by squeeze casting
Journal of Materials Science & Technology, 2016Co-Authors: Teng Liu, Qudong Wang, Yudong Sui, Qigui WangAbstract:The wrought Al alloy–wrought Al alloy overcast joint was fabricated by casting liquid 6101 Al alloy onto 6101 Al extrusion bars and solidifying under Applied Pressure. The joint interfacial microstructure was investigated; the effect of Applied Pressure on the microstructure and mechanical properties was evaluated. The mechanism of joint formation and mechanical behaviors of both squeeze cast 6101 and 6101–6101 overcast joint material were analyzed. The results show that with the application of Pressure during solidification process, wrought Al alloy 6101 could be cast directly into shape successfully. Excellent metallurgical bonding was then formed in the overcast joint by electro-plating 6101 solid insert with a layer of zinc coating, and a transition zone formed in the joint region. During the tensile test, the fracture occurs in the 6101 solid insert part with the ultimate tensile strength (UTS) of 200 MPa, indicating that the strength of the overcast joint is higher than 200 MPa, and the tensile strength of overcast joint material is independent on the magnitude of Applied Pressure. For Al–Al overcast joint material, if a clean and high strength joint is formed, the UTS and yield strength (YS) are determined by the material with the lower value, while for EL, the value is determined by the length proportion and the stress–strain behavior of both components.
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an investigation into interface formation and mechanical properties of aluminum copper bimetal by squeeze casting
Materials & Design, 2016Co-Authors: Qudong Wang, Qigui Wang, Wenjiang DingAbstract:Abstract Aluminum–copper bimetal was prepared by compound casting liquid aluminum onto copper bars and solidifying under Applied Pressure. The effect of pouring temperature and Applied Pressure on microstructure and mechanical and electrical properties of the bimetal was investigated. Bonding mechanism and mechanical and electrical behaviors of bimetal were analyzed. Sound metallurgical bonding could be achieved by applying thermal spray zinc coating onto Cu inserts and carefully controlling the squeeze casting process. The results showed that interfacial reactions between liquid Al and solid Cu lead to the formation of transition zone, four possible layers, Al4Cu9 layer, Al2Cu layer, Al–Cu eutectic layer and Cu rich Al solid solution layer were identified in the transition zone. The thickness of each layer varies with the variation of pouring temperature and Applied Pressure. The formation of inherent defects and thickening of intermetallic compound promotes cracks propagation and weakens the bonding strength, hinders current flowing through and weakens the electrical property. The bimetal made at pouring temperature of 700 °C gives the best mechanical and electrical properties.
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an investigation into aluminum aluminum bimetal fabrication by squeeze casting
Materials & Design, 2015Co-Authors: Qudong Wang, Qigui Wang, Wenjiang DingAbstract:Abstract Aluminum–aluminum bimetal were prepared by casting liquid A356 aluminum alloy onto 6101 aluminum extrusion bars and solidifying under Applied Pressure. The effect of surface treatment, pouring temperature and Applied Pressure on microstructure and mechanical properties of the bimetal was investigated. The results showed that sound metallic bonding could be produced by electro-plating the solid 6101 aluminum alloy with a layer of zinc coating and carefully controlling the casting temperature. With the application of Pressure during solidification process, the tensile strength exhibited more promising results than that made by gravity casting, for both A356 aluminum alloy matrix and bimetal. However, with the increase of Applied Pressure, A356 aluminum alloy matrix and bimetal showed different behaviors. For A356 aluminum alloy matrix, the tensile strength increased with the increase of Applied Pressure, for bimetal it appeared to be independent on the magnitude of the Applied Pressure and the value remained steady. The fracture analysis indicated that during the tensile test of bimetal, the crack initiation began with initial fracture of eutectic Si in the transition zone then extended in the transition zone. The tensile strength of the bimetal fabricated by squeeze casting method was improved by about 10%, from 145 MPa to 155 MPa, as compared with that made by gravity casting. The process presented in this study provides a promising and effective approach to create a metallic bonding between an aluminum insert and various aluminum melts to develop advanced functional and structural materials.
E Hajjari - One of the best experts on this subject based on the ideXlab platform.
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effect of Applied Pressure and nickel coating on microstructural development in continuous carbon fiber reinforced aluminum composites fabricated by squeeze casting
Materials and Manufacturing Processes, 2011Co-Authors: E Hajjari, Mohammad Divandari, H ArabiAbstract:Continuous carbon fiber reinforced aluminum composite samples were produced by squeeze casting method, under Applied Pressures of 30, 50, and 70 MPa. For production of samples, nickel coated and uncoated carbon fibers with a mean volume fraction of 40% were used. After making the fiber preforms, they were preheated and then were replaced in a casting die. Molten 2024 aluminum alloy having a temperature of 750°C was poured into the die, and different amount of Pressures were Applied to infiltrate the melt into the carbon fiber bundles. The effect of Applied Pressure on infiltration mechanism and microstructure of the composite were studied, by evaluating the cross-section of the composite samples, using optical and scanning electron microscopes (SEM). The appropriate Applied Pressures for producing the composite samples for uncoated and nickel coated fibers were different, and the best results were achieved at 50 and 30 MPa, respectively. A specific or a certain range of Pressure seems to be suitable for r...
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the effect of Applied Pressure on fracture surface and tensile properties of nickel coated continuous carbon fiber reinforced aluminum composites fabricated by squeeze casting
Materials & Design, 2010Co-Authors: E Hajjari, Mohammad Divandari, A R MirhabibiAbstract:Composite specimens were consolidated using squeeze casting method under 30, 50 and 70 MPa Applied Pressures. Nickel coated polyacrylonitrile (PAN) based carbon fibers with a mean volume fraction of about 20% were used as reinforcement and the effect of Applied Pressure and coating layer were evaluated by studying the microstructure, fracture surface and tensile properties of the composite samples. The results indicate that presence of nickel coating on the carbon fibers improves the tensile strength of the composites, significantly. This seems to be the result of the effect of nickel layer on improving the wettability and also protecting the fibers against reaction with liquid aluminum during processing the composite. The appropriate Applied Pressure for preparing the composite samples was achieved to be about 30 MPa. Higher Pressures demonstrated damage in distribution of the fibers and also caused separation of nickel coating layer.
