The Experts below are selected from a list of 384 Experts worldwide ranked by ideXlab platform
Ying Wang - One of the best experts on this subject based on the ideXlab platform.
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Research on Fabrication and Semisolid Processing of Semisolid Slurries of 7075 Aluminum Matrix Composites Reinforced with Nano-Sized SiC Particles
Solid State Phenomena, 2016Co-Authors: Jufu Jiang, Ying Wang, Shou-jing LuoAbstract: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.
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microstructure and mechanical properties of the semisolid slurries and rheoformed component of nano sized sic 7075 aluminum matrix composite prepared by ultrasonic assisted semisolid stirring
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2015Co-Authors: Jufu Jiang, Ying WangAbstract:Abstract An innovative method so-called ultrasonic-assisted semisolid stirring was proposed to fabricate semisolid slurries of the nano-sized SiC/7075 aluminum matrix composite. In this method, ultrasonic treatment and semisolid stirring were combined together to disperse the nano-sized SiC and break the primary dendrites of the matrix. The microstructure and mechanical properties of the semisolid slurries and rheoformed cylinder component were investigated. The results show that ultrasonic treatment dispersed the nano-sized SiC particles well due to the effect of transient cavitation and acoustic streaming. With increase of the stirring time the amount of the spheroidal grains of semisolid slurries increases, indicating achieving a better semisolid slurry. When stirring temperature is 620 °C, the 20 min stirring time led to a desirable semisolid microstructure consisting of a large number of spheroidal grains surrounded by liquid phase. High-quality semisolid slurries were only achieved at the stirring temperatures of 615 °C and 620 °C upon the 20 min stirring time. Liquid fraction in the regions near to lateral surface is larger than those in the top, bottom and central regions due to main dependence on liquid flow and flow of liquid incorporating solid grains. Yield strength and ultimate tensile strength of rheoformed cylinder components of the nano-sized SiC/7075 aluminum matrix composite increased as compared with those of the 7075 matrix. Yield strength, ultimate tensile strength and elongation of the rheoformed cylinder components of the nano-sized SiC/7075 aluminum matrix composite without T6 are 264 MPa, 357 MPa and elongation of 7.5%, respectively. T6 heat treatment led to a significant improvement of yield strength, ultimate tensile strength and elongation. The mechanical properties of the rheoformed cylinder components with T6 of the nano-sized SiC/7075 aluminum matrix composite involve yield strength of 381 MPa, ultimate tensile strength of 478 MPa and elongation of 8.5%.
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microstructure and properties of az80 alloy semisolid billets fabricated by new strain induced melt activated method
Transactions of Nonferrous Metals Society of China, 2012Co-Authors: Jufu Jiang, Ying Wang, D U Zhiming, Shou-jing LuoAbstract:Abstract AZ80 alloy semisolid billets were fabricated by a new strain induced melt activated method (SIMA), which involved the predeformation of as-cast AZ81 alloy via equal channel angular extrusion (ECAE) and the following semisolid isothermal treatment of ECAE-processed AZ80 alloys. The results show that highly strain-induced effect is successfully achieved by ECAE due to refined microstructure and the mechanical properties are enhanced. High-quality AZ80 semisolid billets with fine and spherical grains are fabricated by new SIMA method. The results of thixoforged experiment confirm that enhanced mechanical properties including yield strength of 216.9 MPa, ultimate tensile strength of 312.4 MPa and elongation of 26% are successfully achieved. It also confirms that new SIMA method is a very desirable method for fabricating AZ80 alloy semisolid billets.
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microstructure evolution of am60 magnesium alloy semisolid slurry prepared by new sima
Journal of Alloys and Compounds, 2010Co-Authors: Jufu Jiang, Ying Wang, Yi Sun, Shou-jing LuoAbstract:Abstract AM60 magnesium alloy semisolid slurry was prepared by new strain induced melt activated (new SIMA) and its microstructure was observed under optical microscope and then analyzed via digital image analysis system. The results showed that microstructure was well refined to many fine equiaxed grains with the average size of 8 μm after the process of as-cast AM60 magnesium alloy by equal channel angular extrusion (ECAE). And fine and spheroidal semisolid slurry with average grain size ranging from 9.9 μm to 17.3 μm was prepared by new SIMA and the used time was also shorter, as compared with semisolid isothermal treatment (SSIT). LSW theory of Ostwald ripening was demonstrated to be able to be used for the description of the coarsening process of semisolid slurry in new SIMA, instead of coalescence of solid grains in SSIT. When the isothermal temperature was increased, primary solid grains showed an initial increase and a following decrease of an average grain size.
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Preparation and thixoforging of semisolid billet of AZ80 magnesium alloy
Transactions of Nonferrous Metals Society of China, 2010Co-Authors: Jufu Jiang, Ying Wang, Shou-jing LuoAbstract:Semisolid billet of AZ80 magnesium alloy was prepared by new strain induced melt activated (new SIMA) process and thixoforging experiment was performed. The results show that after as-cast AZ80 magnesium alloy is processed by equal channel angular extrusion, microstructure is refined well due to heavy dynamic recrystallization occurring in severe plastic deformation. Compared with semisolid isothermal treatment and conventional SIMA, semisolid billet with fine and spheroidal grains are achieved in new SIMA. Thixoforging process of semisolid billet prepared by new SIMA has many advantages such as good surface quality of final component, high ability to fill cavity and net-shape. The fine and spheroidal grains and high mechanical properties such as tensile strength of 298 MPa and elongation of 28% can be developed in final part thixoforged.
Jufu Jiang - One of the best experts on this subject based on the ideXlab platform.
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Research on Fabrication and Semisolid Processing of Semisolid Slurries of 7075 Aluminum Matrix Composites Reinforced with Nano-Sized SiC Particles
Solid State Phenomena, 2016Co-Authors: Jufu Jiang, Ying Wang, Shou-jing LuoAbstract: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.
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microstructure and mechanical properties of the semisolid slurries and rheoformed component of nano sized sic 7075 aluminum matrix composite prepared by ultrasonic assisted semisolid stirring
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2015Co-Authors: Jufu Jiang, Ying WangAbstract:Abstract An innovative method so-called ultrasonic-assisted semisolid stirring was proposed to fabricate semisolid slurries of the nano-sized SiC/7075 aluminum matrix composite. In this method, ultrasonic treatment and semisolid stirring were combined together to disperse the nano-sized SiC and break the primary dendrites of the matrix. The microstructure and mechanical properties of the semisolid slurries and rheoformed cylinder component were investigated. The results show that ultrasonic treatment dispersed the nano-sized SiC particles well due to the effect of transient cavitation and acoustic streaming. With increase of the stirring time the amount of the spheroidal grains of semisolid slurries increases, indicating achieving a better semisolid slurry. When stirring temperature is 620 °C, the 20 min stirring time led to a desirable semisolid microstructure consisting of a large number of spheroidal grains surrounded by liquid phase. High-quality semisolid slurries were only achieved at the stirring temperatures of 615 °C and 620 °C upon the 20 min stirring time. Liquid fraction in the regions near to lateral surface is larger than those in the top, bottom and central regions due to main dependence on liquid flow and flow of liquid incorporating solid grains. Yield strength and ultimate tensile strength of rheoformed cylinder components of the nano-sized SiC/7075 aluminum matrix composite increased as compared with those of the 7075 matrix. Yield strength, ultimate tensile strength and elongation of the rheoformed cylinder components of the nano-sized SiC/7075 aluminum matrix composite without T6 are 264 MPa, 357 MPa and elongation of 7.5%, respectively. T6 heat treatment led to a significant improvement of yield strength, ultimate tensile strength and elongation. The mechanical properties of the rheoformed cylinder components with T6 of the nano-sized SiC/7075 aluminum matrix composite involve yield strength of 381 MPa, ultimate tensile strength of 478 MPa and elongation of 8.5%.
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microstructure and properties of az80 alloy semisolid billets fabricated by new strain induced melt activated method
Transactions of Nonferrous Metals Society of China, 2012Co-Authors: Jufu Jiang, Ying Wang, D U Zhiming, Shou-jing LuoAbstract:Abstract AZ80 alloy semisolid billets were fabricated by a new strain induced melt activated method (SIMA), which involved the predeformation of as-cast AZ81 alloy via equal channel angular extrusion (ECAE) and the following semisolid isothermal treatment of ECAE-processed AZ80 alloys. The results show that highly strain-induced effect is successfully achieved by ECAE due to refined microstructure and the mechanical properties are enhanced. High-quality AZ80 semisolid billets with fine and spherical grains are fabricated by new SIMA method. The results of thixoforged experiment confirm that enhanced mechanical properties including yield strength of 216.9 MPa, ultimate tensile strength of 312.4 MPa and elongation of 26% are successfully achieved. It also confirms that new SIMA method is a very desirable method for fabricating AZ80 alloy semisolid billets.
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microstructure evolution of am60 magnesium alloy semisolid slurry prepared by new sima
Journal of Alloys and Compounds, 2010Co-Authors: Jufu Jiang, Ying Wang, Yi Sun, Shou-jing LuoAbstract:Abstract AM60 magnesium alloy semisolid slurry was prepared by new strain induced melt activated (new SIMA) and its microstructure was observed under optical microscope and then analyzed via digital image analysis system. The results showed that microstructure was well refined to many fine equiaxed grains with the average size of 8 μm after the process of as-cast AM60 magnesium alloy by equal channel angular extrusion (ECAE). And fine and spheroidal semisolid slurry with average grain size ranging from 9.9 μm to 17.3 μm was prepared by new SIMA and the used time was also shorter, as compared with semisolid isothermal treatment (SSIT). LSW theory of Ostwald ripening was demonstrated to be able to be used for the description of the coarsening process of semisolid slurry in new SIMA, instead of coalescence of solid grains in SSIT. When the isothermal temperature was increased, primary solid grains showed an initial increase and a following decrease of an average grain size.
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Preparation and thixoforging of semisolid billet of AZ80 magnesium alloy
Transactions of Nonferrous Metals Society of China, 2010Co-Authors: Jufu Jiang, Ying Wang, Shou-jing LuoAbstract:Semisolid billet of AZ80 magnesium alloy was prepared by new strain induced melt activated (new SIMA) process and thixoforging experiment was performed. The results show that after as-cast AZ80 magnesium alloy is processed by equal channel angular extrusion, microstructure is refined well due to heavy dynamic recrystallization occurring in severe plastic deformation. Compared with semisolid isothermal treatment and conventional SIMA, semisolid billet with fine and spheroidal grains are achieved in new SIMA. Thixoforging process of semisolid billet prepared by new SIMA has many advantages such as good surface quality of final component, high ability to fill cavity and net-shape. The fine and spheroidal grains and high mechanical properties such as tensile strength of 298 MPa and elongation of 28% can be developed in final part thixoforged.
Salazar Nuria - One of the best experts on this subject based on the ideXlab platform.
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Capacidad de dosificación de vehículos semisólidos en cápsulas duras conteniendo Piroxicam 20 mg
Real Academia Nacional de Farmacia, 2005Co-Authors: Salazar Nuria, Trives Carmen, Del Río, Luis AlbertoAbstract:The aim of the article is to familiarize the pharmaceutical compounding phamacist with liquid and Semisolids contents in the form of capsules. This type of formulations require simple tools. For that, Piroxicam has been chosen as a prototype active ingredient also they have been choosen vehicles with different physico-chemical properties, such as hydrophilic and lipophilic liquids that had to be thicker and another semisolid previously melt. They had been developed methods for the determination of the solubility, viscosity and dosage ability of the formulations. In addition the stability to diverse conditions has been evaluated. The best results have been found with Gelucire® 44/14, semisolid excipient with emulsifying characteristics. It is possible to find better profiles for the other tried formulations alive when the phenomenon of precipitation and retardation could be avoid in the stomach. Additionally, simplicity in their formulation, suitable manufacture and stability turn to this alternative interesting for it application in the oficinal Pharmacy.Se propone familiarizar al farmacéutico del Servicio de Farmacia con las formulaciones líquidas y semisólidas contenidas en la forma farmacéutica de cápsulas. Este tipo de formulaciones requieren de un utillaje sencillo. Para ello se ha elegido como principio activo prototipo a Piroxicam y se han seleccionado vehículos con propiedades fisico-químicas diferentes, esto es, líquidos hidrofílicos y lipofílicos espesados y un vehículo semisólido previamente fundido. Se han puesto a punto métodos para la determinación de la solubilidad, viscosidad, dosificabilidad de las fórmulas, aspecto y ensayo de disolución. Adicionalmente se ha evaluado la estabilidad a diversas condiciones. Los mejores resultados han sido los encontrados con el excipiente semisólido de características emulgentes Gelucire® 44/14. Se pueden esperar mejores perfiles in vivo al eludirse en el estómago el fenómeno de precipitación y consiguiente, retardo que llevan parejo las otras formulaciones ensayadas. Adicionalmente, la sencillez en su formulación, adecuada fabricación y estabilidad convierten a esta alternativa en interesante para el campo de la Farmacia oficinal
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Capacidad de dosificación de vehículos semisólidos en cápsulas duras conteniendo piroxicam 20 mg
Real Academia Nacional de Farmacia, 2005Co-Authors: Salazar Nuria, Trives Del Río, Carmen, Río Barquero, Luis DelAbstract:The aim of the article is to familiarize the pharmaceutical compounding phamacist with liquid and Semisolids contents in the form of capsules. This type of formulations require simple tools. For that, Piroxicam has been chosen as a prototype active ingredient also they have been choosen vehicles with different physico-chemical properties, such as hydrophilic and lipophilic liquids that had to be thicker and another semisolid previously melt. They had been developed methods for the determination of the solubility, viscosity and dosage ability of the formulations. In addition the stability to diverse conditions has been evaluated. The best results have been found with Gelucire® 44/14, semisolid excipient with emulsifying characteristics. It is possible to find better profiles for the other tried formulations alive when the phenomenon of precipitation and retardation could be avoid in the stomach. Additionally, simplicity in their formulation, suitable manufacture and stability turn to this alternative interesting for it application in the oficinal Pharmacy
Del Río, Luis Alberto - One of the best experts on this subject based on the ideXlab platform.
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Capacidad de dosificación de vehículos semisólidos en cápsulas duras conteniendo Piroxicam 20 mg
Real Academia Nacional de Farmacia, 2005Co-Authors: Salazar Nuria, Trives Carmen, Del Río, Luis AlbertoAbstract:The aim of the article is to familiarize the pharmaceutical compounding phamacist with liquid and Semisolids contents in the form of capsules. This type of formulations require simple tools. For that, Piroxicam has been chosen as a prototype active ingredient also they have been choosen vehicles with different physico-chemical properties, such as hydrophilic and lipophilic liquids that had to be thicker and another semisolid previously melt. They had been developed methods for the determination of the solubility, viscosity and dosage ability of the formulations. In addition the stability to diverse conditions has been evaluated. The best results have been found with Gelucire® 44/14, semisolid excipient with emulsifying characteristics. It is possible to find better profiles for the other tried formulations alive when the phenomenon of precipitation and retardation could be avoid in the stomach. Additionally, simplicity in their formulation, suitable manufacture and stability turn to this alternative interesting for it application in the oficinal Pharmacy.Se propone familiarizar al farmacéutico del Servicio de Farmacia con las formulaciones líquidas y semisólidas contenidas en la forma farmacéutica de cápsulas. Este tipo de formulaciones requieren de un utillaje sencillo. Para ello se ha elegido como principio activo prototipo a Piroxicam y se han seleccionado vehículos con propiedades fisico-químicas diferentes, esto es, líquidos hidrofílicos y lipofílicos espesados y un vehículo semisólido previamente fundido. Se han puesto a punto métodos para la determinación de la solubilidad, viscosidad, dosificabilidad de las fórmulas, aspecto y ensayo de disolución. Adicionalmente se ha evaluado la estabilidad a diversas condiciones. Los mejores resultados han sido los encontrados con el excipiente semisólido de características emulgentes Gelucire® 44/14. Se pueden esperar mejores perfiles in vivo al eludirse en el estómago el fenómeno de precipitación y consiguiente, retardo que llevan parejo las otras formulaciones ensayadas. Adicionalmente, la sencillez en su formulación, adecuada fabricación y estabilidad convierten a esta alternativa en interesante para el campo de la Farmacia oficinal
Jun Yanagimoto - One of the best experts on this subject based on the ideXlab platform.
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partial melting behavior and thixoforming properties of extruded magnesium alloy az91 with and without addition of sic particles with a volume fraction of 15
Journal of Materials Science & Technology, 2017Co-Authors: Yi Meng, Sumio Sugiyama, Jun YanagimotoAbstract:Abstract A series of reheating-isothermal holding experiments and compression tests were conducted on pristine magnesium alloy AZ91 extruded by equal channel angular extrusion (ECAE) and SiC particles (a volume fraction of 15%) reinforced AZ91 composite (AZ91-SiCp) by regular extrusion. Dissolution of eutectic compounds and partial melting of the α-Mg matrix occurred during the reheating of these materials. Spherical semisolid slurries of these materials were obtained when the reheating temperature and isothermal holding time were 550 °C and 20 s, respectively. The presence of SiCp in AZ91-SiCp not only caused lower liquid fractions of semisolid slurries but also resulted in higher values of flow stress during semisolid compression tests. Both AZ91 alloy and AZ91-SiCp composite exhibited better thixoforming properties at high temperatures. Segregation of SiCp did not occur during thixoforming of AZ91-SiCp composite after an isothermal holding at semisolid temperatures for 20 s.
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microstructural evolution during partial melting and semisolid forming behaviors of two hot rolled cr v mo tool steels
Journal of Materials Processing Technology, 2015Co-Authors: Yi Meng, Sumio Sugiyama, Jun YanagimotoAbstract:Abstract Using a multistage hot compression test machine, reheating experiments and semisolid compression tests were conducted on two commercial rolled Cr–V–Mo tool steels, SKD11 and SKD61. Austenization, grain growth, carbide dissolution, and partial melting took place during the reheating of the tool steels, and resulting in spherical semisolid slurries at certain temperatures (1300 °C for SKD11, 1405 °C for SKD61). The microstructural evolution of SKD11 and SKD61 tool steels during reheating and rapid cooling was found to be different owing to their different alloying element contents and the different distributions and morphologies of the carbides inside them. The forming characteristics of the two tool steels in the semisolid state were discussed on the basis of the results of compression tests.
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feasibility of recycling aluminum alloy scrap by semisolid extrusion
Solid State Phenomena, 2008Co-Authors: Sumio Sugiyama, Jun YanagimotoAbstract:The feasibility of recycling machining grindings of aluminum alloys by semisolid process has been investigated. Machining grindings of A2011 aluminum alloy produced experimentally by lathe machining were used. The material is put into a metal mold and compressed up to 90 % of the true density at room temperature. The metal mold with the compressed machining grindings is heated up to a specified temperature. Afterwards, the metal mold is set into the extrusion container, and extrusion in hot and semisolid range was carried out. In this experimental study, extrusion load, internal structure of the product and mechanical properties (tensile strength, elongation, hardness) of the product are assessed. It was proven that semisolid extrusion is about 40% less extrusion load compared with that of hot extrusion, the shape of the machining grindings remained in the hot extrusion and the semisolid extrusion products extrusion ratios higher than 10 have excellent elongation property, which is comparable to the commercialized product.
