The Experts below are selected from a list of 3873 Experts worldwide ranked by ideXlab platform
Yasumasa Chino - One of the best experts on this subject based on the ideXlab platform.
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effects of initial microstructure on the microstructural evolution and stretch formability of warm rolled mg 3al 1zn alloy sheets
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2013Co-Authors: Xinsheng Huang, Kazutaka Suzuki, Motohiro Yuasa, Yasumasa ChinoAbstract:Abstract Microstructural evolution and stretch formability of Mg–3Al–1Zn (AZ31) magnesium alloy sheets warm rolled at 225 °C by a single differential speed Rolling Pass with two different initial microstructures were investigated. A cast ingot and that rolled by one Pass at a high temperature of 550 °C with average grain sizes of ~470 μm and ~19 μm, respectively, were used as starting materials. Both warm rolled sheets exhibit deformation microstructure in as-rolled condition and the occurrence of texture randomization during subsequent annealing as a result of static recrystallization. New recrystallized grains with a large orientation spread tend to persist in the original orientations of parent deformed grains and twin hosts. Regarding the nucleation sites at pre-existing grain boundaries and double twins, static recrystallization preferentially occurs at the sides of deformed grains and within double twins with their c -axes inclining toward the Rolling direction (RD), resulting in a stable end annealing texture with a basal pole tilting toward the RD. For the sheet warm rolled from a cast ingot, incomplete recrystallization originating from less stored energy in the interiors of large deformed grains results in an insufficient texture weakening and an inhomogenous microstructure. Both sheets possess an improved stretch formability compared with conventional AZ31 alloy sheets due to the weakened textures. Benefiting from a weaker basal texture and a more homogenous microstructure, the sheet rolled at 550 °C followed by warm Rolling at 225 °C exhibits a higher Erichsen value of 8.2 compared with that (6.1) of the sheet warm rolled directly from a cast ingot.
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improvement of stretch formability of mg 3al 1zn alloy sheet by high temperature Rolling at finishing Pass
Journal of Alloys and Compounds, 2011Co-Authors: Xinsheng Huang, Kazutaka Suzuki, Yasumasa Chino, Mamoru MabuchiAbstract:Abstract The effects of increasing Rolling temperature from 723 K to 828 K at the last Rolling Pass on microstructure, texture, mechanical properties and stretch formability of a Mg–3Al–1Zn magnesium alloy previously rolled at 723 K were investigated. In the as-rolled condition, the basal texture strengthens slightly with increasing the Rolling temperature whereas it weakens more remarkably after static recrystallization during annealing for the sheets rolled at higher temperatures. Only by increasing the Rolling temperature from 723 K to 798 K, the Erichsen value is significantly increased from 4.5 to 8.6 due to the weakened texture for the annealed sheets. Further increasing the last Rolling temperature does not appear to further improve the stretch formability.
Xinsheng Huang - One of the best experts on this subject based on the ideXlab platform.
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effects of initial microstructure on the microstructural evolution and stretch formability of warm rolled mg 3al 1zn alloy sheets
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2013Co-Authors: Xinsheng Huang, Kazutaka Suzuki, Motohiro Yuasa, Yasumasa ChinoAbstract:Abstract Microstructural evolution and stretch formability of Mg–3Al–1Zn (AZ31) magnesium alloy sheets warm rolled at 225 °C by a single differential speed Rolling Pass with two different initial microstructures were investigated. A cast ingot and that rolled by one Pass at a high temperature of 550 °C with average grain sizes of ~470 μm and ~19 μm, respectively, were used as starting materials. Both warm rolled sheets exhibit deformation microstructure in as-rolled condition and the occurrence of texture randomization during subsequent annealing as a result of static recrystallization. New recrystallized grains with a large orientation spread tend to persist in the original orientations of parent deformed grains and twin hosts. Regarding the nucleation sites at pre-existing grain boundaries and double twins, static recrystallization preferentially occurs at the sides of deformed grains and within double twins with their c -axes inclining toward the Rolling direction (RD), resulting in a stable end annealing texture with a basal pole tilting toward the RD. For the sheet warm rolled from a cast ingot, incomplete recrystallization originating from less stored energy in the interiors of large deformed grains results in an insufficient texture weakening and an inhomogenous microstructure. Both sheets possess an improved stretch formability compared with conventional AZ31 alloy sheets due to the weakened textures. Benefiting from a weaker basal texture and a more homogenous microstructure, the sheet rolled at 550 °C followed by warm Rolling at 225 °C exhibits a higher Erichsen value of 8.2 compared with that (6.1) of the sheet warm rolled directly from a cast ingot.
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improvement of stretch formability of mg 3al 1zn alloy sheet by high temperature Rolling at finishing Pass
Journal of Alloys and Compounds, 2011Co-Authors: Xinsheng Huang, Kazutaka Suzuki, Yasumasa Chino, Mamoru MabuchiAbstract:Abstract The effects of increasing Rolling temperature from 723 K to 828 K at the last Rolling Pass on microstructure, texture, mechanical properties and stretch formability of a Mg–3Al–1Zn magnesium alloy previously rolled at 723 K were investigated. In the as-rolled condition, the basal texture strengthens slightly with increasing the Rolling temperature whereas it weakens more remarkably after static recrystallization during annealing for the sheets rolled at higher temperatures. Only by increasing the Rolling temperature from 723 K to 798 K, the Erichsen value is significantly increased from 4.5 to 8.6 due to the weakened texture for the annealed sheets. Further increasing the last Rolling temperature does not appear to further improve the stretch formability.
Mamoru Mabuchi - One of the best experts on this subject based on the ideXlab platform.
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improvement of stretch formability of mg 3al 1zn alloy sheet by high temperature Rolling at finishing Pass
Journal of Alloys and Compounds, 2011Co-Authors: Xinsheng Huang, Kazutaka Suzuki, Yasumasa Chino, Mamoru MabuchiAbstract:Abstract The effects of increasing Rolling temperature from 723 K to 828 K at the last Rolling Pass on microstructure, texture, mechanical properties and stretch formability of a Mg–3Al–1Zn magnesium alloy previously rolled at 723 K were investigated. In the as-rolled condition, the basal texture strengthens slightly with increasing the Rolling temperature whereas it weakens more remarkably after static recrystallization during annealing for the sheets rolled at higher temperatures. Only by increasing the Rolling temperature from 723 K to 798 K, the Erichsen value is significantly increased from 4.5 to 8.6 due to the weakened texture for the annealed sheets. Further increasing the last Rolling temperature does not appear to further improve the stretch formability.
Kazutaka Suzuki - One of the best experts on this subject based on the ideXlab platform.
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effects of initial microstructure on the microstructural evolution and stretch formability of warm rolled mg 3al 1zn alloy sheets
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2013Co-Authors: Xinsheng Huang, Kazutaka Suzuki, Motohiro Yuasa, Yasumasa ChinoAbstract:Abstract Microstructural evolution and stretch formability of Mg–3Al–1Zn (AZ31) magnesium alloy sheets warm rolled at 225 °C by a single differential speed Rolling Pass with two different initial microstructures were investigated. A cast ingot and that rolled by one Pass at a high temperature of 550 °C with average grain sizes of ~470 μm and ~19 μm, respectively, were used as starting materials. Both warm rolled sheets exhibit deformation microstructure in as-rolled condition and the occurrence of texture randomization during subsequent annealing as a result of static recrystallization. New recrystallized grains with a large orientation spread tend to persist in the original orientations of parent deformed grains and twin hosts. Regarding the nucleation sites at pre-existing grain boundaries and double twins, static recrystallization preferentially occurs at the sides of deformed grains and within double twins with their c -axes inclining toward the Rolling direction (RD), resulting in a stable end annealing texture with a basal pole tilting toward the RD. For the sheet warm rolled from a cast ingot, incomplete recrystallization originating from less stored energy in the interiors of large deformed grains results in an insufficient texture weakening and an inhomogenous microstructure. Both sheets possess an improved stretch formability compared with conventional AZ31 alloy sheets due to the weakened textures. Benefiting from a weaker basal texture and a more homogenous microstructure, the sheet rolled at 550 °C followed by warm Rolling at 225 °C exhibits a higher Erichsen value of 8.2 compared with that (6.1) of the sheet warm rolled directly from a cast ingot.
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improvement of stretch formability of mg 3al 1zn alloy sheet by high temperature Rolling at finishing Pass
Journal of Alloys and Compounds, 2011Co-Authors: Xinsheng Huang, Kazutaka Suzuki, Yasumasa Chino, Mamoru MabuchiAbstract:Abstract The effects of increasing Rolling temperature from 723 K to 828 K at the last Rolling Pass on microstructure, texture, mechanical properties and stretch formability of a Mg–3Al–1Zn magnesium alloy previously rolled at 723 K were investigated. In the as-rolled condition, the basal texture strengthens slightly with increasing the Rolling temperature whereas it weakens more remarkably after static recrystallization during annealing for the sheets rolled at higher temperatures. Only by increasing the Rolling temperature from 723 K to 798 K, the Erichsen value is significantly increased from 4.5 to 8.6 due to the weakened texture for the annealed sheets. Further increasing the last Rolling temperature does not appear to further improve the stretch formability.
J B Lee - One of the best experts on this subject based on the ideXlab platform.
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effect of the speed ratio on grain refinement and texture development in pure ti during differential speed Rolling
Scripta Materialia, 2011Co-Authors: W J Kim, Sungjun Yoo, Hyotae Jeong, D M Kim, Byunghak Choe, J B LeeAbstract:The effect of the roll speed ratio (SR) on the microstructure, texture and mechanical properties of commercially pure Ti during differential speed Rolling was examined at 673 K in a wide range of SRs between 1 and 5 to produce Ti sheets with an ultrafine-grained microstructure exhibiting high strength. At an SR of 5, a defect-free sheet with shear bands and ultrafine grains homogeneously distributed over the entire thickness of the sheet could be fabricated through a single Rolling Pass.
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microstructure and mechanical properties of pure ti processed by high ratio differential speed Rolling at room temperature
Scripta Materialia, 2010Co-Authors: W J Kim, Seung Jo Yoo, J B LeeAbstract:High-strength Ti sheets could be fabricated by effective grain-refinement through high-ratio differential speed Rolling for a thickness reduction of 63% in a single Rolling Pass at room temperature. Formation of narrowly spaced shear bands distributed uniformly over the entire thickness section of the sheet and a high temperature rise by intensive shear banding during Rolling resulted in the formation of ultrafine grains with the size of 0.1–0.3 μm. The rolled Ti sheet exhibited an ultimate tensile strength of 895–915 MPa.
