The Experts below are selected from a list of 4872 Experts worldwide ranked by ideXlab platform
Yonghui Hao - One of the best experts on this subject based on the ideXlab platform.
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Anisotropy of thermal conductivity and mechanical properties in Mg–5Zn–1Mn alloy
Materials & Design, 2012Co-Authors: Yuan Jiawei, Kui Zhang, Li Yongjun, Ping Luo, Guangqiu Luo, Yonghui HaoAbstract:Abstract The microstructure, texture, thermal conductivity and mechanical properties of the as-extruded Mg–5Zn–1Mn (ZM51) magnesium alloy were investigated on specimens with the Extrusion Direction (ED), the transverse Direction (TD) and the normal to the extrude plane (ND), respectively. The results indicated that the thermal conductivity of ZM51 alloy at room temperature is 125 (W/m K), almost twice as high as other conventional commercial magnesium alloys, such as Mg–Al series and Mg–RE series. The effect of texture on anisotropy of mechanical properties and thermal conductivity has been analyzed. The strong crystallographic texture typical of Mg alloys results in much higher yield strength and tensile strength (UTS) in the Extrusion Direction, but higher ductility and thermal conductivity in the transverse Direction.
Gerardo Garcés - One of the best experts on this subject based on the ideXlab platform.
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anisotropic plastic behavior in an extruded long period ordered structure mg90y6 5ni3 5 at alloy
Crystals, 2020Co-Authors: Gerardo Garcés, Rafael Barea, Andreas Stark, Norbert SchellAbstract:The Mg90Y6.5Ni3.5 alloy composed almost completely of the Long-Period-Stacking-Ordered (LPSO) phase has been prepared by casting and Extrusion at high temperature. An elongated microstructure is obtained where the LPSO phase with 18R crystal structure is oriented with its basal plane parallel to the Extrusion Direction. Islands of α-magnesium are located between the LPSO grains. The mechanical properties of the alloy are highly anisotropic and depend on the stress sign as well as the relative orientation between the stress and the Extrusion axes. The alloy is stronger when it is compressed along the Extrusion Direction. Under this configuration, the slip of dislocations in the basal plane is highly limited. However, the activation of kinking induces an increase in the plastic deformation. In the transversal Extrusion Direction, some grains deform by the activation of basal slip. The difference in the yield stress between the different stress configurations decreases with the increase in the test temperature. The evolution of internal strains obtained during in-situ compressive experiments reveals that tensile twinning is not activated in the LPSO phase.
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Evolution of twinning in extruded AZ31 alloy with bimodal grain structure
Materials Characterization, 2017Co-Authors: Gerardo Garcés, Pablo Pérez, W. Gan, E. Oñorbe, Kristián Máthis, Domonkos Tolnai, Klaudia Horváth, Paloma AdevaAbstract:Abstract Twinning in extruded AZ31 alloy with a bimodal grain structure is studied under compression along the Extrusion Direction. This study has combined in-situ measurements during the compression tests by Synchrotron Radiation Diffraction and Acoustic Emission techniques and the evaluation of the microstructure and texture in post-mortem compression samples deformed at different strains. The microstructure of the alloy is characterized by the coexistence of large areas of fine dynamic recrystallized grains and coarse non-recrystallized grains elongated along Extrusion Direction. Twinning occurs initially in large elongated grains before the macroscopic yield stress which is controlled by the twinning in equiaxed dynamically recrystallized grains.
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Reverse tension/compression asymmetry of a Mg–Y–Zn alloys containing LPSO phases
Materials Science and Engineering: A, 2015Co-Authors: Gerardo Garcés, Pablo Pérez, Sandra Cabeza, H.k. Lin, Shae-kwang Kim, W. Gan, Paloma AdevaAbstract:Abstract Room temperature mechanical behavior of extruded Mg–Y–Zn alloys with varying fractions of LPSO phase was studied in tension and compression along the Extrusion Direction. The microstructure is characterised by elongated LPSO fibers along the Extrusion Direction within the magnesium matrix. Moreover, the magnesium matrix presents a bimodal grain structure with dynamically-recrystallized grains and deformed, elongated grains with the basal plane parallel to the Extrusion Direction. The beginning of plasticity depends on the volume fraction of deformed and DRX grains. Alloys with low volume fraction of LPSO phase (
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Effect of the Extrusion texture on the mechanical behaviour of Mg–SiCp composites
Scripta Materialia, 2005Co-Authors: Gerardo Garcés, Pablo Pérez, Paloma AdevaAbstract:Abstract The plastic behaviour at room temperature of powder metallurgy magnesium and magnesium composites reinforced with SiC particles was evaluated. Materials exhibit a fiber texture with {0 0 0 1} planes parallel to the Extrusion Direction. The fiber intensity decreases as the SiC particle volume fraction increases, producing a reduction in the tension/compression asymmetry.
Paloma Adeva - One of the best experts on this subject based on the ideXlab platform.
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Evolution of twinning in extruded AZ31 alloy with bimodal grain structure
Materials Characterization, 2017Co-Authors: Gerardo Garcés, Pablo Pérez, W. Gan, E. Oñorbe, Kristián Máthis, Domonkos Tolnai, Klaudia Horváth, Paloma AdevaAbstract:Abstract Twinning in extruded AZ31 alloy with a bimodal grain structure is studied under compression along the Extrusion Direction. This study has combined in-situ measurements during the compression tests by Synchrotron Radiation Diffraction and Acoustic Emission techniques and the evaluation of the microstructure and texture in post-mortem compression samples deformed at different strains. The microstructure of the alloy is characterized by the coexistence of large areas of fine dynamic recrystallized grains and coarse non-recrystallized grains elongated along Extrusion Direction. Twinning occurs initially in large elongated grains before the macroscopic yield stress which is controlled by the twinning in equiaxed dynamically recrystallized grains.
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Reverse tension/compression asymmetry of a Mg–Y–Zn alloys containing LPSO phases
Materials Science and Engineering: A, 2015Co-Authors: Gerardo Garcés, Pablo Pérez, Sandra Cabeza, H.k. Lin, Shae-kwang Kim, W. Gan, Paloma AdevaAbstract:Abstract Room temperature mechanical behavior of extruded Mg–Y–Zn alloys with varying fractions of LPSO phase was studied in tension and compression along the Extrusion Direction. The microstructure is characterised by elongated LPSO fibers along the Extrusion Direction within the magnesium matrix. Moreover, the magnesium matrix presents a bimodal grain structure with dynamically-recrystallized grains and deformed, elongated grains with the basal plane parallel to the Extrusion Direction. The beginning of plasticity depends on the volume fraction of deformed and DRX grains. Alloys with low volume fraction of LPSO phase (
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Effect of the Extrusion texture on the mechanical behaviour of Mg–SiCp composites
Scripta Materialia, 2005Co-Authors: Gerardo Garcés, Pablo Pérez, Paloma AdevaAbstract:Abstract The plastic behaviour at room temperature of powder metallurgy magnesium and magnesium composites reinforced with SiC particles was evaluated. Materials exhibit a fiber texture with {0 0 0 1} planes parallel to the Extrusion Direction. The fiber intensity decreases as the SiC particle volume fraction increases, producing a reduction in the tension/compression asymmetry.
Yuan Jiawei - One of the best experts on this subject based on the ideXlab platform.
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Anisotropy of thermal conductivity and mechanical properties in Mg–5Zn–1Mn alloy
Materials & Design, 2012Co-Authors: Yuan Jiawei, Kui Zhang, Li Yongjun, Ping Luo, Guangqiu Luo, Yonghui HaoAbstract:Abstract The microstructure, texture, thermal conductivity and mechanical properties of the as-extruded Mg–5Zn–1Mn (ZM51) magnesium alloy were investigated on specimens with the Extrusion Direction (ED), the transverse Direction (TD) and the normal to the extrude plane (ND), respectively. The results indicated that the thermal conductivity of ZM51 alloy at room temperature is 125 (W/m K), almost twice as high as other conventional commercial magnesium alloys, such as Mg–Al series and Mg–RE series. The effect of texture on anisotropy of mechanical properties and thermal conductivity has been analyzed. The strong crystallographic texture typical of Mg alloys results in much higher yield strength and tensile strength (UTS) in the Extrusion Direction, but higher ductility and thermal conductivity in the transverse Direction.
Yuansheng Yang - One of the best experts on this subject based on the ideXlab platform.
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Effects of solution and quenching treatment on the residual stress in extruded ZK60 magnesium alloy
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2018Co-Authors: Cong Wang, Ji Xue Zhou, Yuansheng YangAbstract:Abstract The quench induced residual stress in extruded ZK60 magnesium alloy is investigated. X-ray diffraction and layer removal technique are employed to determine the residual stress in Extrusion and long transverse Direction through the thickness of the extruded plate after solution and quenching treatment. FEM simulation is employed to clarify the origin of the stress state. The residual stress is not uniform through thickness, it is compressive on the surface and first decreases and then increases in absolute magnitude with increasing depth and becomes tensile in the center. Anisotropic residual stress can be detected, with larger stress in long transverse Direction and smaller stress in Extrusion Direction. This is rationalized by the anisotropic flow stress caused by the tilted basal texture. Anisotropic residual stress can be replicated in simulation using an isotropic yield function at high temperature and an anisotropic yield function at low temperature during quenching, the smaller flow stress in Extrusion Direction facilitates plastic flow at low temperature and results in smaller compressive residual stress in Extrusion Direction. The fact that no twins can be found after quenching demonstrates that the asymmetric yield strength associated with twinning does not affect the residual stress.
