The Experts below are selected from a list of 2202 Experts worldwide ranked by ideXlab platform
Enhou Han - One of the best experts on this subject based on the ideXlab platform.
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orientations of nuclei during Static Recrystallization in a cold rolled mg zn gd alloy
Journal of Materials Science & Technology, 2021Co-Authors: Langlang Zhao, H Yan, Runkun Chen, Enhou HanAbstract:Abstract The Static Recrystallization process of a cold-rolled Mg-Zn-Gd alloy was tracked by a quasi-in-situ electron backscatter diffraction method to investigate the orientations of nuclei. The results show that orientation distribution of nuclei is associated with nucleation mechanism. The continuous Static Recrystallization nuclei display similar orientations to the parent grains with TD orientation. Differently, discontinuous Static Recrystallization nuclei formed within the parent grains (TD-45° orientation) show random orientations and a variety of misorientation angles but preferred axes 52 ¯ 73> or 52 ¯ 70>. Interestingly, a special oriented nucleation is found. Discontinuous Static Recrystallization nuclei originated from boundaries of the parent grain (TD-70° orientation) show concentrated TD orientations in another side due to the preferred misorientation relationship 70° 11 2 ¯ 0> (∑18b). It is speculated that these two special misorientation relationships are related to the dislocation type.
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oriented nucleation causing unusual texture transition during Static Recrystallization annealing in cold rolled mg zn gd alloys
Scripta Materialia, 2020Co-Authors: H Yan, L Y Zhao, Runsheng Chen, Enhou HanAbstract:Abstract The Static Recrystallization, nuclei orientations, and texture evolution of cold-rolled Mg–Zn–Gd alloys during annealing were tracked by quasi-in-situ electron backscatter diffraction method. An unusual texture transition from “rolling direction (RD)-split” to “transverse direction (TD)-split” occurred and oriented nucleation was observed. Nuclei originating from boundaries of the parent grain with “RD” orientation mainly exhibited “TD” orientations, and showed preferential misorientation relationship around 62.5° (including basal axes , , and ) with respect to the parent grain, which may be related to basal dislocations and low boundary energy.
Yasumasa Chino - One of the best experts on this subject based on the ideXlab platform.
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Static Recrystallization behavior of hot rolled mg zn ce magnesium alloy sheet
Journal of Alloys and Compounds, 2017Co-Authors: Xinsheng Huang, Kazutaka Suzuki, Yasumasa ChinoAbstract:Abstract Static Recrystallization behavior of Mg-1.5Zn-0.2Ce (wt%) alloy rolled at 480 °C was investigated at different annealing stages using quasi-in-situ electron backscattered diffraction (EBSD) analyses, which were carried out repeatedly in the same region to trace microstructural evolution. In the as-rolled condition, double twins exhibit the highest fraction compared with tensile and compression twins. Double twins mostly exist in deformed grains with basal orientations, and Statically recrystallized grains mainly nucleate at the intersections of double twins and pre-existing grain boundaries. Statically recrystallized grains tend to exhibit TD-tilted orientations and grow along double twins to consume adjacent basal-oriented grains. This is the main reason for inducing the change from a RD-split texture to a well-weakened TD-split texture during annealing. The residual unrecrystallized grains with TD-tilted orientations and the growth advantage of TD-tilted grains also enhance the formation of TD-split texture.
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influence of rolling temperature on Static Recrystallization behavior of az31 magnesium alloy
Journal of Materials Science, 2012Co-Authors: Xinsheng Huang, Kazutaka Suzuki, Yasumasa Chino, Mamoru MabuchiAbstract:Poor formability of rolled magnesium (Mg) alloys extremely restricts applications in form of sheets originating from formation of strong basal texture. Recently, we found that increasing rolling temperature from 723 to 798 K for a AZ31 Mg alloy can significantly improve stretch formability due to remarkable texture weakening after annealing. In this study, Static Recrystallization behaviors of AZ31 alloy sheets rolled at 723 and 798 K were investigated by electron backscattered diffraction analyses at different annealing stages in order to understand the origin of high temperature rolling on texture weakening. For both sheets, similar deformation microstructures with approximately the same types and fractions of twins exist in the as-rolled condition and recrystallized grains are mainly formed at pre-existing grain boundaries due to discontinuous Recrystallization during subsequent annealing. However, only the basal texture of the latter remarkably weakens due to the formation of new recrystallized grains with well-dispersed orientations. Non-basal slips enhanced during high temperature rolling at 798 K are most likely responsible for the texture randomization as a result of rotations of Recrystallization nuclei.
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Static Recrystallization and mechanical properties of Mg–4Y–3RE magnesium alloy sheet processed by differential speed rolling at 823 K
Materials Science and Engineering: A, 2012Co-Authors: Xinsheng Huang, Kazutaka Suzuki, Yasumasa ChinoAbstract:Abstract The microstructural and textural evolution during post-annealing as well as mechanical properties of a Mg–4Y–3RE magnesium alloy sheet processed by differential speed rolling at 823 K were investigated. The as-rolled sheet exhibits deformation microstructure regardless of the high rolling temperature. Static Recrystallization occurs around second-phase particles as a result of particle-stimulated nucleation and also at pre-existing grain boundaries due to solute effects of rare-earth elements, resulting in randomization of basal texture. Despite a large amount of second-phase particles, the weakened texture leads to a moderate stretch formability with an Erichsen value of 4.4.
L Y Zhao - One of the best experts on this subject based on the ideXlab platform.
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oriented nucleation causing unusual texture transition during Static Recrystallization annealing in cold rolled mg zn gd alloys
Scripta Materialia, 2020Co-Authors: H Yan, L Y Zhao, Runsheng Chen, Enhou HanAbstract:Abstract The Static Recrystallization, nuclei orientations, and texture evolution of cold-rolled Mg–Zn–Gd alloys during annealing were tracked by quasi-in-situ electron backscatter diffraction method. An unusual texture transition from “rolling direction (RD)-split” to “transverse direction (TD)-split” occurred and oriented nucleation was observed. Nuclei originating from boundaries of the parent grain with “RD” orientation mainly exhibited “TD” orientations, and showed preferential misorientation relationship around 62.5° (including basal axes , , and ) with respect to the parent grain, which may be related to basal dislocations and low boundary energy.
Xinsheng Huang - One of the best experts on this subject based on the ideXlab platform.
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Static Recrystallization behavior of hot rolled mg zn ce magnesium alloy sheet
Journal of Alloys and Compounds, 2017Co-Authors: Xinsheng Huang, Kazutaka Suzuki, Yasumasa ChinoAbstract:Abstract Static Recrystallization behavior of Mg-1.5Zn-0.2Ce (wt%) alloy rolled at 480 °C was investigated at different annealing stages using quasi-in-situ electron backscattered diffraction (EBSD) analyses, which were carried out repeatedly in the same region to trace microstructural evolution. In the as-rolled condition, double twins exhibit the highest fraction compared with tensile and compression twins. Double twins mostly exist in deformed grains with basal orientations, and Statically recrystallized grains mainly nucleate at the intersections of double twins and pre-existing grain boundaries. Statically recrystallized grains tend to exhibit TD-tilted orientations and grow along double twins to consume adjacent basal-oriented grains. This is the main reason for inducing the change from a RD-split texture to a well-weakened TD-split texture during annealing. The residual unrecrystallized grains with TD-tilted orientations and the growth advantage of TD-tilted grains also enhance the formation of TD-split texture.
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influence of rolling temperature on Static Recrystallization behavior of az31 magnesium alloy
Journal of Materials Science, 2012Co-Authors: Xinsheng Huang, Kazutaka Suzuki, Yasumasa Chino, Mamoru MabuchiAbstract:Poor formability of rolled magnesium (Mg) alloys extremely restricts applications in form of sheets originating from formation of strong basal texture. Recently, we found that increasing rolling temperature from 723 to 798 K for a AZ31 Mg alloy can significantly improve stretch formability due to remarkable texture weakening after annealing. In this study, Static Recrystallization behaviors of AZ31 alloy sheets rolled at 723 and 798 K were investigated by electron backscattered diffraction analyses at different annealing stages in order to understand the origin of high temperature rolling on texture weakening. For both sheets, similar deformation microstructures with approximately the same types and fractions of twins exist in the as-rolled condition and recrystallized grains are mainly formed at pre-existing grain boundaries due to discontinuous Recrystallization during subsequent annealing. However, only the basal texture of the latter remarkably weakens due to the formation of new recrystallized grains with well-dispersed orientations. Non-basal slips enhanced during high temperature rolling at 798 K are most likely responsible for the texture randomization as a result of rotations of Recrystallization nuclei.
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Static Recrystallization and mechanical properties of Mg–4Y–3RE magnesium alloy sheet processed by differential speed rolling at 823 K
Materials Science and Engineering: A, 2012Co-Authors: Xinsheng Huang, Kazutaka Suzuki, Yasumasa ChinoAbstract:Abstract The microstructural and textural evolution during post-annealing as well as mechanical properties of a Mg–4Y–3RE magnesium alloy sheet processed by differential speed rolling at 823 K were investigated. The as-rolled sheet exhibits deformation microstructure regardless of the high rolling temperature. Static Recrystallization occurs around second-phase particles as a result of particle-stimulated nucleation and also at pre-existing grain boundaries due to solute effects of rare-earth elements, resulting in randomization of basal texture. Despite a large amount of second-phase particles, the weakened texture leads to a moderate stretch formability with an Erichsen value of 4.4.
Langlang Zhao - One of the best experts on this subject based on the ideXlab platform.
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orientations of nuclei during Static Recrystallization in a cold rolled mg zn gd alloy
Journal of Materials Science & Technology, 2021Co-Authors: Langlang Zhao, H Yan, Runkun Chen, Enhou HanAbstract:Abstract The Static Recrystallization process of a cold-rolled Mg-Zn-Gd alloy was tracked by a quasi-in-situ electron backscatter diffraction method to investigate the orientations of nuclei. The results show that orientation distribution of nuclei is associated with nucleation mechanism. The continuous Static Recrystallization nuclei display similar orientations to the parent grains with TD orientation. Differently, discontinuous Static Recrystallization nuclei formed within the parent grains (TD-45° orientation) show random orientations and a variety of misorientation angles but preferred axes 52 ¯ 73> or 52 ¯ 70>. Interestingly, a special oriented nucleation is found. Discontinuous Static Recrystallization nuclei originated from boundaries of the parent grain (TD-70° orientation) show concentrated TD orientations in another side due to the preferred misorientation relationship 70° 11 2 ¯ 0> (∑18b). It is speculated that these two special misorientation relationships are related to the dislocation type.
