The Experts below are selected from a list of 276 Experts worldwide ranked by ideXlab platform
Shulin Lü - One of the best experts on this subject based on the ideXlab platform.
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ultrasonic vibration and rheocasting for refinement of mg zn y alloy reinforced with lpso structure
Metals and Materials International, 2018Co-Authors: Shulin Lü, Shusen Wu, Xiaogang Fang, Xiong Yang, Jing WangAbstract:In this work, ultrasonic vibration (UV) and rheo-squeeze casting was first applied on the Mg alloy reinforced with long period stacking ordered (LPSO) structure. The Semisolid Slurry of Mg–Zn–Y alloy was prepared by UV and processed by rheo-squeeze casting in succession. The effects of UV, Zr addition and squeeze pressure on microstructure of Semisolid Mg–Zn–Y alloy were studied. The results revealed that the synergic effect of UV and Zr addition generated a finer microstructure than either one alone when preparing the slurries. Rheo-squeeze casting could significantly refine the LPSO structure and α-Mg matrix in Mg96.9Zn1Y2Zr0.1 alloy without changing the phase compositions or the type of LPSO structure. When the squeeze pressure increased from 0 to 400 MPa, the block LPSO structure was completely eliminated and the average thickness of LPSO structure decreased from 9.8 to 4.3 μm. Under 400 MPa squeeze pressure, the tensile strength and elongation of the rheocast Mg96.9Zn1Y2Zr0.1 alloy reached the maximum values, which were 234 MPa and 17.6%, respectively, due to its fine α-Mg matrix (α1-Mg and α2-Mg grains) and LPSO structure.
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microstructure and properties of lpso phase reinforced mg alloy produced by rheocasting
Solid State Phenomena, 2016Co-Authors: Shulin Lü, Shusen Wu, Xiaogang Fang, Xiong Yang, Jing WangAbstract:The long period stacking ordered (LPSO) phase reinforced Mg alloys have received many researches in recent years because of their excellent mechanical properties. However, the LPSO phase usually concentrates at the grain boundaries with a coarse network structure, which seriously deteriorates its strengthening effect. In this research, rheocasting and ultrasonic vibration (USV) process were firstly used to refine the LPSO phase in Mg alloy. The Semisolid Slurry of Mg96.9Y2Zn1Zr0.1 (at.%) alloy was prepared by USV and then formed by rheo-squeeze casting (RSC). The effects of USV and squeeze pressure on the microstructure and mechanical properties of this Mg alloy were investigated. The results show that the primary α-Mg and coarse LPSO phases were refined obviously by USV and RSC. The tensile strength and elongation of the RSC Mg96.9Y2Zn1Zr0.1 alloy were 232 MPa and 17.7% respectively, which were increased by 17.8% and 172.3% respectively compared to the conventional liquid casting alloy. The refinement mechanism of the LPSO phase in Semisolid Mg alloy is also discussed.
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the indirect ultrasonic vibration process for rheo squeeze casting of a356 aluminum alloy
Journal of Materials Processing Technology, 2012Co-Authors: Shulin Lü, Shusen Wu, Ping AnAbstract:Abstract The Semisolid Slurry of A356 Al alloy was prepared by indirect ultrasonic vibration (IUV) method and then formed by direct squeeze casting (SC). The effects of squeeze pressure and T6 heat treatment on the microstructure and mechanical properties of rheo-squeeze casting (RSC) A356 Al alloy were investigated. The results indicate that with the increase of squeeze pressure, the average diameter of primary α-Al particles decreased, while the densities and mechanical properties of the samples increased. The effect of T6 heat treatment on the mechanical properties is more significant in RSC samples than in conventional SC samples. The tensile strength and elongation of T6 heat treated RSC samples under 100 MPa pressure are 338 MPa and 8%, respectively.
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microstructure and property of rheocasting aluminum alloy made with indirect ultrasonic vibration process
Materials Letters, 2012Co-Authors: Shusen Wu, Shulin Lü, Ping An, H NakaeAbstract:Abstract This paper reports a new Slurry-making process with indirect ultrasonic vibration (IUV), in which the horn is vibrated under the outside of the metallic cup containing alloy melt. Semisolid Slurry of A356 Al alloy was prepared by this process, and the effects of IUV treatment time on the morphology of the primary α -Al phase and mechanical properties of rheo-diecasting samples were studied. The results indicate that excellent Semisolid Slurry of A356 Al alloy could be obtained within 50 s by applying IUV near its liquidus temperature. The sample rheocasted with the Slurry made by IUV for 50 s had the maximum tensile strength and elongation, which were 254 MPa and 7.5% respectively.
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Effects of rheo-squeeze casting parameters on microstructure and mechanical properties of AlCuMnTi alloy
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2012Co-Authors: Shusen Wu, Shulin LüAbstract:Abstract The Semisolid Slurry of AlCu5MnTi alloy was prepared by indirect ultrasonic vibration (IUV), in which the horn was vibrated under the outside of the metallic cup containing alloy melt, then the Slurry was formed by direct squeeze casting (SC). The effects of applied pressure, mould temperature and heat treatment on microstructure and mechanical properties of rheo-squeeze casting (RSC) AlCu5MnTi alloy were studied. The results show that with the increase of pressure, the average diameter of grain decreased continuously, while the average shape factor increased. With the increase of mould temperature, mechanical properties of RSC samples increased firstly and decreased afterward. When the pressure was 100 MPa and the mould temperature was 270 °C samples achieved the best mechanical properties after T5 heat treatment. The tensile strength and elongation were 326.5 MPa and 11% respectively, which were improved by 6.5% and 47% respectively compared with conventional squeeze casting samples.
Yi Meng - One of the best experts on this subject based on the ideXlab platform.
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effects of forming parameters on microstructure and mechanical properties of a cup shaped mg 8 20gd 4 48y 3 34zn 0 36zr alloy sample manufactured by thixoforming
The International Journal of Advanced Manufacturing Technology, 2019Co-Authors: Zong-yao Xie, Yan Tian, Jian-cheng Zhou, Yi MengAbstract:Thixoforming experiments of a cup-shaped Mg–8.20Gd–4.48Y–3.34Zn–0.36Zr alloy sample were carried out on a hydraulic press at different temperatures under different forming loads. Metallographic analysis, Vickers hardness test, and tensile tests were conducted to investigate the microstructure and mechanical properties of the samples formed under different forming parameters. Samples without macro- and micro-defects formed successfully at 580 °C under different forming loads were attributed to the excellent formability of Semisolid Slurry with homogeneous globular microstructure. Because solid and liquid phases in the Semisolid slurries exhibited different forming behaviors during thixoforming, liquid segregation occurred and resulted in the inhomogeneous microstructural distribution in thixoformed samples. Owing to the different crystal structures of α-Mg and (Mg, Zn)3RE eutectic compounds transformed from liquid phase, their volume fraction, morphologies, and distributions affected the mechanical properties of the thixoformed samples significantly. Neither formability of Semisolid Slurry nor the microstructure of thixoformed sample was affected significantly by the forming load. Higher values of Vickers hardness measured in the bottom regions of the sample formed under higher forming loads were attributed to the higher residual stress caused by the excess forming energy.
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effects of reheating and subsequent rapid cooling on microstructural evolution and Semisolid forming behaviors of extruded mg 8 20gd 4 48y 3 34zn 0 36zr alloy
Journal of Materials Processing Technology, 2017Co-Authors: Yi Meng, Qiang Chen, Sumio Sugiyama, Jun YanagimotoAbstract:Abstract Reheating and rapid cooling experiments, and Semisolid compression tests were conducted on extruded Mg–8.20Gd–4.48Y–3.34Zn–0.36Zr alloy using a multistage hot compression test machine. Affected by reheating temperature, heating rate and isothermal holding time, dissolution of eutectic compounds and partial melting occurred during reheating, dynamic arrangement of alloying elements and phase transformation took place during subsequent rapid cooling. These microstructural behaviors not only changed the anisotropy in microstructural morphology of the extruded Mg–8.20Gd–4.48Y–3.34Zn–0.36Zr alloy, but also affected the anisotropy in forming properties of it. When this alloy was reheated to 580 °C with a heating rate of 20 °C/s and held isothermally for 20 s, Semisolid Slurry without anisotropy in microstructural morphology and forming properties, exhibiting a homogeneous spherical microstructure was obtained.
Shusen Wu - One of the best experts on this subject based on the ideXlab platform.
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ultrasonic vibration and rheocasting for refinement of mg zn y alloy reinforced with lpso structure
Metals and Materials International, 2018Co-Authors: Shulin Lü, Shusen Wu, Xiaogang Fang, Xiong Yang, Jing WangAbstract:In this work, ultrasonic vibration (UV) and rheo-squeeze casting was first applied on the Mg alloy reinforced with long period stacking ordered (LPSO) structure. The Semisolid Slurry of Mg–Zn–Y alloy was prepared by UV and processed by rheo-squeeze casting in succession. The effects of UV, Zr addition and squeeze pressure on microstructure of Semisolid Mg–Zn–Y alloy were studied. The results revealed that the synergic effect of UV and Zr addition generated a finer microstructure than either one alone when preparing the slurries. Rheo-squeeze casting could significantly refine the LPSO structure and α-Mg matrix in Mg96.9Zn1Y2Zr0.1 alloy without changing the phase compositions or the type of LPSO structure. When the squeeze pressure increased from 0 to 400 MPa, the block LPSO structure was completely eliminated and the average thickness of LPSO structure decreased from 9.8 to 4.3 μm. Under 400 MPa squeeze pressure, the tensile strength and elongation of the rheocast Mg96.9Zn1Y2Zr0.1 alloy reached the maximum values, which were 234 MPa and 17.6%, respectively, due to its fine α-Mg matrix (α1-Mg and α2-Mg grains) and LPSO structure.
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microstructure and properties of lpso phase reinforced mg alloy produced by rheocasting
Solid State Phenomena, 2016Co-Authors: Shulin Lü, Shusen Wu, Xiaogang Fang, Xiong Yang, Jing WangAbstract:The long period stacking ordered (LPSO) phase reinforced Mg alloys have received many researches in recent years because of their excellent mechanical properties. However, the LPSO phase usually concentrates at the grain boundaries with a coarse network structure, which seriously deteriorates its strengthening effect. In this research, rheocasting and ultrasonic vibration (USV) process were firstly used to refine the LPSO phase in Mg alloy. The Semisolid Slurry of Mg96.9Y2Zn1Zr0.1 (at.%) alloy was prepared by USV and then formed by rheo-squeeze casting (RSC). The effects of USV and squeeze pressure on the microstructure and mechanical properties of this Mg alloy were investigated. The results show that the primary α-Mg and coarse LPSO phases were refined obviously by USV and RSC. The tensile strength and elongation of the RSC Mg96.9Y2Zn1Zr0.1 alloy were 232 MPa and 17.7% respectively, which were increased by 17.8% and 172.3% respectively compared to the conventional liquid casting alloy. The refinement mechanism of the LPSO phase in Semisolid Mg alloy is also discussed.
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the indirect ultrasonic vibration process for rheo squeeze casting of a356 aluminum alloy
Journal of Materials Processing Technology, 2012Co-Authors: Shulin Lü, Shusen Wu, Ping AnAbstract:Abstract The Semisolid Slurry of A356 Al alloy was prepared by indirect ultrasonic vibration (IUV) method and then formed by direct squeeze casting (SC). The effects of squeeze pressure and T6 heat treatment on the microstructure and mechanical properties of rheo-squeeze casting (RSC) A356 Al alloy were investigated. The results indicate that with the increase of squeeze pressure, the average diameter of primary α-Al particles decreased, while the densities and mechanical properties of the samples increased. The effect of T6 heat treatment on the mechanical properties is more significant in RSC samples than in conventional SC samples. The tensile strength and elongation of T6 heat treated RSC samples under 100 MPa pressure are 338 MPa and 8%, respectively.
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microstructure and property of rheocasting aluminum alloy made with indirect ultrasonic vibration process
Materials Letters, 2012Co-Authors: Shusen Wu, Shulin Lü, Ping An, H NakaeAbstract:Abstract This paper reports a new Slurry-making process with indirect ultrasonic vibration (IUV), in which the horn is vibrated under the outside of the metallic cup containing alloy melt. Semisolid Slurry of A356 Al alloy was prepared by this process, and the effects of IUV treatment time on the morphology of the primary α -Al phase and mechanical properties of rheo-diecasting samples were studied. The results indicate that excellent Semisolid Slurry of A356 Al alloy could be obtained within 50 s by applying IUV near its liquidus temperature. The sample rheocasted with the Slurry made by IUV for 50 s had the maximum tensile strength and elongation, which were 254 MPa and 7.5% respectively.
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Effects of rheo-squeeze casting parameters on microstructure and mechanical properties of AlCuMnTi alloy
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2012Co-Authors: Shusen Wu, Shulin LüAbstract:Abstract The Semisolid Slurry of AlCu5MnTi alloy was prepared by indirect ultrasonic vibration (IUV), in which the horn was vibrated under the outside of the metallic cup containing alloy melt, then the Slurry was formed by direct squeeze casting (SC). The effects of applied pressure, mould temperature and heat treatment on microstructure and mechanical properties of rheo-squeeze casting (RSC) AlCu5MnTi alloy were studied. The results show that with the increase of pressure, the average diameter of grain decreased continuously, while the average shape factor increased. With the increase of mould temperature, mechanical properties of RSC samples increased firstly and decreased afterward. When the pressure was 100 MPa and the mould temperature was 270 °C samples achieved the best mechanical properties after T5 heat treatment. The tensile strength and elongation were 326.5 MPa and 11% respectively, which were improved by 6.5% and 47% respectively compared with conventional squeeze casting samples.
Ping An - One of the best experts on this subject based on the ideXlab platform.
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the indirect ultrasonic vibration process for rheo squeeze casting of a356 aluminum alloy
Journal of Materials Processing Technology, 2012Co-Authors: Shulin Lü, Shusen Wu, Ping AnAbstract:Abstract The Semisolid Slurry of A356 Al alloy was prepared by indirect ultrasonic vibration (IUV) method and then formed by direct squeeze casting (SC). The effects of squeeze pressure and T6 heat treatment on the microstructure and mechanical properties of rheo-squeeze casting (RSC) A356 Al alloy were investigated. The results indicate that with the increase of squeeze pressure, the average diameter of primary α-Al particles decreased, while the densities and mechanical properties of the samples increased. The effect of T6 heat treatment on the mechanical properties is more significant in RSC samples than in conventional SC samples. The tensile strength and elongation of T6 heat treated RSC samples under 100 MPa pressure are 338 MPa and 8%, respectively.
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microstructure and property of rheocasting aluminum alloy made with indirect ultrasonic vibration process
Materials Letters, 2012Co-Authors: Shusen Wu, Shulin Lü, Ping An, H NakaeAbstract:Abstract This paper reports a new Slurry-making process with indirect ultrasonic vibration (IUV), in which the horn is vibrated under the outside of the metallic cup containing alloy melt. Semisolid Slurry of A356 Al alloy was prepared by this process, and the effects of IUV treatment time on the morphology of the primary α -Al phase and mechanical properties of rheo-diecasting samples were studied. The results indicate that excellent Semisolid Slurry of A356 Al alloy could be obtained within 50 s by applying IUV near its liquidus temperature. The sample rheocasted with the Slurry made by IUV for 50 s had the maximum tensile strength and elongation, which were 254 MPa and 7.5% respectively.
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preparation and rheocasting of Semisolid Slurry of 5083 al alloy with indirect ultrasonic vibration process
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2011Co-Authors: Shulin Lü, Shusen Wu, Zuqi Hu, Ping An, Ping AnAbstract:Abstract The indirect ultrasonic vibration (IUV) method, in which the horn was vibrated under the outside of the metallic cup containing alloy melt, was employed for preparing Semisolid Slurry of 5083 Al alloy in this work. The effect of IUV on the microstructure of Semisolid Slurry and mechanical properties of rheo-diecasting samples were studied. The results indicate that good Semisolid Slurry could be obtained when the melt treated by IUV for 50 s, and the average diameter and shape coefficient of primary α-Al particles were 60 μm and 0.54 respectively. Apart from preparing Semisolid Slurry with fine microstructure, IUV had degassing effect on Semisolid Slurry of 5083 Al alloy. The tensile strength and elongation of the rheo-diecasting samples were 283 MPa and 9% respectively, which were increased by 11.4% and 32.4% respectively compared to conventional liquid die-casting samples.
Jun Yanagimoto - One of the best experts on this subject based on the ideXlab platform.
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effects of reheating and subsequent rapid cooling on microstructural evolution and Semisolid forming behaviors of extruded mg 8 20gd 4 48y 3 34zn 0 36zr alloy
Journal of Materials Processing Technology, 2017Co-Authors: Yi Meng, Qiang Chen, Sumio Sugiyama, Jun YanagimotoAbstract:Abstract Reheating and rapid cooling experiments, and Semisolid compression tests were conducted on extruded Mg–8.20Gd–4.48Y–3.34Zn–0.36Zr alloy using a multistage hot compression test machine. Affected by reheating temperature, heating rate and isothermal holding time, dissolution of eutectic compounds and partial melting occurred during reheating, dynamic arrangement of alloying elements and phase transformation took place during subsequent rapid cooling. These microstructural behaviors not only changed the anisotropy in microstructural morphology of the extruded Mg–8.20Gd–4.48Y–3.34Zn–0.36Zr alloy, but also affected the anisotropy in forming properties of it. When this alloy was reheated to 580 °C with a heating rate of 20 °C/s and held isothermally for 20 s, Semisolid Slurry without anisotropy in microstructural morphology and forming properties, exhibiting a homogeneous spherical microstructure was obtained.
