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Mihriban Pekguleryuz - One of the best experts on this subject based on the ideXlab platform.
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Magnesium Technology 2014 - Effect of Annealing on Microstructure, Texture and Tensile Properties of Twin-Roll Cast AZ31B
Magnesium Technology 2014, 2014Co-Authors: Mohsen Masoumi, Faramarz Zarandi, Mihriban PekguleryuzAbstract:Twin-roll cast (TRC) AZ31 alloy (Mg-3wt.%Al-1wt.%Zn) was subjected to heat treatment at 420 °C. As a result, the intensity of the original basal texture was reduced considerably. Crystallographic orientation analysis revealed that such a change in the texture is due to Particle-Stimulated Nucleation of new grains with random orientations. The tensile test results indicate that annealing slightly increases ultimate tensile strength (UTS), however, dramatically improves the elongation.
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effect of extrusion temperature on texture evolution and recrystallization in extruded mg 1 mn and mg 1 mn 1 6 sr alloys
Journal of Alloys and Compounds, 2013Co-Authors: Hemant Borkar, Raynald Gauvin, Mihriban PekguleryuzAbstract:Abstract Alloys Mg–1% Mn (M1) and Mg–1% Mn–1.6Sr (M1–1.6Sr) were subjected to three extrusion temperatures of 300, 350 and 400 °C at 8 mm/s ram speed in order to investigate the texture evolution and recrystallization mechanisms. M1 alloy exhibits weaker texture after extrusion at 300 °C, but develops strong basal texture at 350 and 400 °C. The weaker texture of M1 at 300 °C is partially due to random orientations created by CDRX mechanism. M1–1.6Sr alloy develops weaker textures at all extrusion temperatures as a result of Particle Stimulated Nucleation promoted by Mg–Sr intermetallics which forms grains with random orientations.
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Effect of Sr on the texture of rolled Mg–Mn-based alloys
Materials Letters, 2012Co-Authors: Mohsen Masoumi, Mihriban PekguleryuzAbstract:Abstract Mg–1 wt.%Mn–xwt.%Sr (MJ) alloys have been synthesized with Sr additions in the range of 0–1 wt.%. It was found that, compared to the Mg–1 wt.%Mn (M1) alloy, the overall texture intensity of basal poles is weakened for rolled as well as rolled-annealed MJ alloys containing 0.5 and 1.0 wt.%Sr. The texture weakening is attributed to Particle-Stimulated Nucleation (PSN).
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Effect of strontium on flow behavior and texture evolution during the hot deformation of Mg–1 wt%Mn alloy
Materials Science and Engineering: A, 2012Co-Authors: Hemant Borkar, Majid Hoseini, Mihriban PekguleryuzAbstract:Abstract Effect of Sr addition on hot deformation characteristics and texture evolution of Mg–1 wt%Mn (M1) alloy is investigated with hot compression tests. Sr additions of up to 2 wt% to M1 alloy refine the as-cast microstructure. Flow curves of M1 and M1–Sr alloys have been plotted at 400 °C and 0.1/s strain rate which show softening behavior indicating dynamic recrystallization (DRX). The texture of M1 alloy after hot compression is strong basal in nature but it weakens with increasing Sr additions. This is attributed to Particle-Stimulated Nucleation (PSN) of recrystallization, induced by Mg–Sr intermetallics in the hot deformed microstructure.
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The influence of Ce on the microstructure and rolling texture of Mg–1%Mn alloy
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2011Co-Authors: Mohsen Masoumi, Majid Hoseini, Mihriban PekguleryuzAbstract:Abstract In this study, the microstructures and textures of rolled and rolled/annealed Mg–1 wt.%Mn-based alloys containing different levels of Ce (from 0.05 to 1.0 wt.%) were examined. The Ce addition refined the as-cast and rolled/annealed grain structure of Mg–1 wt.%Mn alloy. Moreover, the overall texture intensity of basal pole was weakened for rolled as well as rolled/annealed Mg–Mn–Ce alloys compared to the Mg–1 wt.%Mn (M1) alloy. The texture weakening was attributed to the solid solubility of Ce in Mg rather than Particle Stimulated Nucleation (PSN) or c / a ratio alteration.
L.h. Lou - One of the best experts on this subject based on the ideXlab platform.
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The deformation and the recrystallization initiation in the dendrite core and interdendritic regions of a directionally solidified nickel-based superalloy
Journal of Alloys and Compounds, 2015Co-Authors: L. Wang, Weiguo Jiang, L.h. LouAbstract:Abstract The deformation and the recrystallization initiation in the dendrite core and interdendritic regions were investigated by employing microhardness tester, optical microscope, scanning electron microscope and electron backscatter diffraction technique. It was found that different recrystallization Nucleation mechanisms operated in the dendrite core and interdendritic regions. Recrystallization Nucleation may take place by strain induced boundary migration in the dendrite cores, while Particle Stimulated Nucleation occurs in the interdendritic regions. The deformation and the recrystallization initiation in the dendrite core and interdendritic regions were compared and discussed. The role of the carbides and eutectics in Particle Stimulated Nucleation was also clarified.
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On the role of carbides during the recrystallization of a directionally solidified nickel-base superalloy
Scripta Materialia, 2006Co-Authors: L. Wang, G. Xie, Jian Zhang, L.h. LouAbstract:The effect of carbides on the Nucleation and growth of recrystallization in an experimental directionally solidified nickel-base superalloy was studied. It was found that carbides may act as Nucleation sites of recrystallized grains by a Particle Stimulated Nucleation mechanism. However, they prevent the migration of recrystallization grain boundaries through various pinning mechanisms.
Saifei Zhang - One of the best experts on this subject based on the ideXlab platform.
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Hot workability of burn resistant Ti–35V–15Cr–0.3Si–0.1C alloy
Materials Science and Technology, 2016Co-Authors: Saifei Zhang, Dadi Zhou, W.d. Zeng, Y. LaiAbstract:In this study, hot workability of Ti–35V–15Cr–0.3Si–0.1C alloy is investigated in the temperature range of 900–1150°C and strain rate range of 0.01–10 s− 1 using processing maps. In the maps, the stability domain displays the feature of dynamic recrystallisation and dynamic recovery. The fraction of recrystallisation in this alloy is much larger than that in other β-Ti alloys, which can be attributed to the effect of titanium carbides by a ‘Particle Stimulated Nucleation’ mechanism. Higher temperature and lower strain rate are helpful for breaking down the carbides and improving the workability. However, deforming >1100°C would result in grain coarsening. In instability domain, the occurrence of flow localisation, shear bands and cracking is discussed. The optimised processing window is in 1050–1100°C /0.01–0.1 s− 1.
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the Particle Stimulated Nucleation in ti 35v 15cr 0 3si 0 1c alloy
Materials Letters, 2016Co-Authors: Saifei Zhang, Weidong Zeng, Dadi Zhou, Yunjin Lai, Qinyang ZhaoAbstract:Abstract A special recrystallization mechanism called ‘Particle Stimulated Nucleation’ (PSN) is found responsible for the pervasive discontinuous dynamic recrystallization (DDRX) in the burn resistant β-stablized Ti–35V–15Cr–0.3Si–0.1C alloy. This might be the first time that PSN is found in titanium alloys. PSN mechanism is studied by transmission electron microscopy (TEM) and Electron Back Scattered Diffraction (EBSD) techniques. Local strain incompatibility between the matrix and the titanium carbides leads to high density of dislocation in the Particle deformation zone (PDZ), which provides the ideal sites for PSN. Recrystallized grains produced by PSN is randomly oriented and the microtexture gets weaker as the fraction of DRX increases.
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The Particle Stimulated Nucleation in Ti–35V–15Cr–0.3Si–0.1C alloy
Materials Letters, 2016Co-Authors: Saifei Zhang, Weidong Zeng, Dadi Zhou, Yunjin Lai, Qinyang ZhaoAbstract:Abstract A special recrystallization mechanism called ‘Particle Stimulated Nucleation’ (PSN) is found responsible for the pervasive discontinuous dynamic recrystallization (DDRX) in the burn resistant β-stablized Ti–35V–15Cr–0.3Si–0.1C alloy. This might be the first time that PSN is found in titanium alloys. PSN mechanism is studied by transmission electron microscopy (TEM) and Electron Back Scattered Diffraction (EBSD) techniques. Local strain incompatibility between the matrix and the titanium carbides leads to high density of dislocation in the Particle deformation zone (PDZ), which provides the ideal sites for PSN. Recrystallized grains produced by PSN is randomly oriented and the microtexture gets weaker as the fraction of DRX increases.
Qinyang Zhao - One of the best experts on this subject based on the ideXlab platform.
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the Particle Stimulated Nucleation in ti 35v 15cr 0 3si 0 1c alloy
Materials Letters, 2016Co-Authors: Saifei Zhang, Weidong Zeng, Dadi Zhou, Yunjin Lai, Qinyang ZhaoAbstract:Abstract A special recrystallization mechanism called ‘Particle Stimulated Nucleation’ (PSN) is found responsible for the pervasive discontinuous dynamic recrystallization (DDRX) in the burn resistant β-stablized Ti–35V–15Cr–0.3Si–0.1C alloy. This might be the first time that PSN is found in titanium alloys. PSN mechanism is studied by transmission electron microscopy (TEM) and Electron Back Scattered Diffraction (EBSD) techniques. Local strain incompatibility between the matrix and the titanium carbides leads to high density of dislocation in the Particle deformation zone (PDZ), which provides the ideal sites for PSN. Recrystallized grains produced by PSN is randomly oriented and the microtexture gets weaker as the fraction of DRX increases.
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The Particle Stimulated Nucleation in Ti–35V–15Cr–0.3Si–0.1C alloy
Materials Letters, 2016Co-Authors: Saifei Zhang, Weidong Zeng, Dadi Zhou, Yunjin Lai, Qinyang ZhaoAbstract:Abstract A special recrystallization mechanism called ‘Particle Stimulated Nucleation’ (PSN) is found responsible for the pervasive discontinuous dynamic recrystallization (DDRX) in the burn resistant β-stablized Ti–35V–15Cr–0.3Si–0.1C alloy. This might be the first time that PSN is found in titanium alloys. PSN mechanism is studied by transmission electron microscopy (TEM) and Electron Back Scattered Diffraction (EBSD) techniques. Local strain incompatibility between the matrix and the titanium carbides leads to high density of dislocation in the Particle deformation zone (PDZ), which provides the ideal sites for PSN. Recrystallized grains produced by PSN is randomly oriented and the microtexture gets weaker as the fraction of DRX increases.
L. Wang - One of the best experts on this subject based on the ideXlab platform.
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The deformation and the recrystallization initiation in the dendrite core and interdendritic regions of a directionally solidified nickel-based superalloy
Journal of Alloys and Compounds, 2015Co-Authors: L. Wang, Weiguo Jiang, L.h. LouAbstract:Abstract The deformation and the recrystallization initiation in the dendrite core and interdendritic regions were investigated by employing microhardness tester, optical microscope, scanning electron microscope and electron backscatter diffraction technique. It was found that different recrystallization Nucleation mechanisms operated in the dendrite core and interdendritic regions. Recrystallization Nucleation may take place by strain induced boundary migration in the dendrite cores, while Particle Stimulated Nucleation occurs in the interdendritic regions. The deformation and the recrystallization initiation in the dendrite core and interdendritic regions were compared and discussed. The role of the carbides and eutectics in Particle Stimulated Nucleation was also clarified.
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On the role of carbides during the recrystallization of a directionally solidified nickel-base superalloy
Scripta Materialia, 2006Co-Authors: L. Wang, G. Xie, Jian Zhang, L.h. LouAbstract:The effect of carbides on the Nucleation and growth of recrystallization in an experimental directionally solidified nickel-base superalloy was studied. It was found that carbides may act as Nucleation sites of recrystallized grains by a Particle Stimulated Nucleation mechanism. However, they prevent the migration of recrystallization grain boundaries through various pinning mechanisms.