The Experts below are selected from a list of 216 Experts worldwide ranked by ideXlab platform
V. N. Serebryany - One of the best experts on this subject based on the ideXlab platform.
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The Role of Structure and Texture Factors in the Ductility and Deformability Improving of Magnesium Alloys Subjected to ECAP
Materials Science Forum, 2011Co-Authors: V. N. Serebryany, Sergey V. DobatkinAbstract:Equal channel angular pressing (ECAP) in magnesium alloys due to the severe plastic shear deformations provides both grain refinement and the slope of the initial basal texture at 40-50 ° to the pressing direction. Such changes in microstructure and texture contribute to the improvement of Low-Temperature Ductility and deformability of the alloys. On the basis of analysis of data from various researchers, the main structure and texture factors affecting on the Ductility increase of the Mg-Al-Zn-Mn alloys were defined.
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Texture of the Mg-0.49% Al-0.47% Ca alloy after equal-channel angular pressing
Russian Metallurgy (Metally), 2008Co-Authors: V. N. Serebryany, T. M. Ivanova, A. S. Gordeev, M. V. Popov, V. N. Timofeev, L. L. Rokhlin, S. V. DobatkinAbstract:Equal-channel angular pressing (ECAP) is used to refine grains and to change the texture of the initial pressed Mg-0.49% Al-0.47% Ca alloy rod in order to study the possibility of increasing the Low-Temperature Ductility of the alloy. ECAP is performed at 300°C in six passes at a total true logarithmic strain ε = 6.8 according to route B _ C . As a result, an ultrafine-grained structure with a grain size of 2–5 μm forms. The initial texture of the pressed rod is characterized by the [12 11] axial orientation parallel to the pressing direction. After ECAP, the texture changes its type and is characterized by a set of preferred orientations that represent basal planes located at an angle of 40°–50° with respect to the pressing direction. An analysis of the generalized Schmid factors, which were calculated for the main operating deformation systems with allowance for the critical shear stresses in them and the volume fractions of the preferred orientations, indicates that the texture caused by ECAP affects the decrease in the strength properties of the alloy measured at room temperature and the increase in the Low-Temperature Ductility of the alloy.
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Texture of the Mg-0.49% Al-0.47% Ca alloy after equal-channel angular pressing
Russian Metallurgy (Metally), 2008Co-Authors: V. N. Serebryany, T. M. Ivanova, A. S. Gordeev, M. V. Popov, V. N. Timofeev, L. L. Rokhlin, S. V. DobatkinAbstract:Equal-channel angular pressing (ECAP) is used to refine grains and to change the texture of the initial pressed Mg-0.49% Al-0.47% Ca alloy rod in order to study the possibility of increasing the Low-Temperature Ductility of the alloy. ECAP is performed at 300°C in six passes at a total true logarithmic strain e = 6.8 according to route BC. As a result, an ultrafine-grained structure with a grain size of 2–5 μm forms. The initial texture of the pressed rod is characterized by the [12 11] axial orientation parallel to the pressing direction. After ECAP, the texture changes its type and is characterized by a set of preferred orientations that represent basal planes located at an angle of 40°–50° with respect to the pressing direction. An analysis of the generalized Schmid factors, which were calculated for the main operating deformation systems with allowance for the critical shear stresses in them and the volume fractions of the preferred orientations, indicates that the texture caused by ECAP affects the decrease in the strength properties of the alloy measured at room temperature and the increase in the Low-Temperature Ductility of the alloy.
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Effect of Texture and Microstructure on Ductility of a Mg-Al-Ca Alloy Processed by Equal Channel Angular Pressing
Materials Science Forum, 2008Co-Authors: V. N. Serebryany, A. S. Gordeev, V. N. Timofeev, L. L. Rokhlin, Michail V Popov, Yuri Estrin, Sergey V. DobatkinAbstract:Texture and microstructure formation during equal channel angular pressing (ECAP) of Mg-0.49%Al-0.47%Ca alloy were studied. The selected ECAP condition (route BC, N=6 passes, true strain e ≈ 6.8, T=300°C) ensures an ultrafine-grained structure of the alloy and basal texture, inclined at an angle of 45-55o relative to the direction of extrusion. The expectation that such a change of the texture, together with the refinement of microstructure, should improve the low temperature Ductility of this material was confirmed by tensile testing.
B. D. Bryskin - One of the best experts on this subject based on the ideXlab platform.
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Concerning Sigma-Phase in Molybdenum-Rhenium Alloys
Journal of Materials Engineering and Performance, 1994Co-Authors: J. -c. Carlen, B. D. BryskinAbstract:Molybdenum-rhenium alloys containing 40 to 48% Re by weight are commonly used for many high-technology applications. Higher rhenium contents bring the alloys into a two-phase region with the presence of brittle o-phase, an intermetallic compound with the approximate composition of Mo _2Re_3. Alloys with lower rhenium contents do not possess sufficient Low-Temperature Ductility and high-temperature strength. Available phase diagrams for the molybdenum-rhenium system contain conflicting information about the single-phase/two-phase borderlines. Further, the formation of σ-phase and its influence on mechanical properties depends on forming process and heat treatment, diffusion rate, precipitation mechanism, and morphology. Very few data on these factors are available in the literature. Three alloys were selected for study of the formation of o-phase: Mo-41Re, Mo-44.5Re, and Mo-47.5Re. Applying different production parameters, especially heat treatments, the properties of the alloys were evaluated using microstructure examinations, electron probe microanalysis, and hardness testing. It was found that any harmful influence of o-phase can be largely eliminated by properly adjusting and controlling the processing parameters. Modification of the chemical composition allows the presence of o-phase to be avoided with no deterioration of Low-Temperature properties.
S. V. Dobatkin - One of the best experts on this subject based on the ideXlab platform.
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Texture of the Mg-0.49% Al-0.47% Ca alloy after equal-channel angular pressing
Russian Metallurgy (Metally), 2008Co-Authors: V. N. Serebryany, T. M. Ivanova, A. S. Gordeev, M. V. Popov, V. N. Timofeev, L. L. Rokhlin, S. V. DobatkinAbstract:Equal-channel angular pressing (ECAP) is used to refine grains and to change the texture of the initial pressed Mg-0.49% Al-0.47% Ca alloy rod in order to study the possibility of increasing the Low-Temperature Ductility of the alloy. ECAP is performed at 300°C in six passes at a total true logarithmic strain ε = 6.8 according to route B _ C . As a result, an ultrafine-grained structure with a grain size of 2–5 μm forms. The initial texture of the pressed rod is characterized by the [12 11] axial orientation parallel to the pressing direction. After ECAP, the texture changes its type and is characterized by a set of preferred orientations that represent basal planes located at an angle of 40°–50° with respect to the pressing direction. An analysis of the generalized Schmid factors, which were calculated for the main operating deformation systems with allowance for the critical shear stresses in them and the volume fractions of the preferred orientations, indicates that the texture caused by ECAP affects the decrease in the strength properties of the alloy measured at room temperature and the increase in the Low-Temperature Ductility of the alloy.
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Texture of the Mg-0.49% Al-0.47% Ca alloy after equal-channel angular pressing
Russian Metallurgy (Metally), 2008Co-Authors: V. N. Serebryany, T. M. Ivanova, A. S. Gordeev, M. V. Popov, V. N. Timofeev, L. L. Rokhlin, S. V. DobatkinAbstract:Equal-channel angular pressing (ECAP) is used to refine grains and to change the texture of the initial pressed Mg-0.49% Al-0.47% Ca alloy rod in order to study the possibility of increasing the Low-Temperature Ductility of the alloy. ECAP is performed at 300°C in six passes at a total true logarithmic strain e = 6.8 according to route BC. As a result, an ultrafine-grained structure with a grain size of 2–5 μm forms. The initial texture of the pressed rod is characterized by the [12 11] axial orientation parallel to the pressing direction. After ECAP, the texture changes its type and is characterized by a set of preferred orientations that represent basal planes located at an angle of 40°–50° with respect to the pressing direction. An analysis of the generalized Schmid factors, which were calculated for the main operating deformation systems with allowance for the critical shear stresses in them and the volume fractions of the preferred orientations, indicates that the texture caused by ECAP affects the decrease in the strength properties of the alloy measured at room temperature and the increase in the Low-Temperature Ductility of the alloy.
Werner Skrotzki - One of the best experts on this subject based on the ideXlab platform.
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Low temperature deformation mechanisms of single crystalline intermetallic compound YAg
Scripta Materialia, 2020Co-Authors: R. Schaarschuch, Carl-georg Oertel, Guanghui Cao, Jens Freudenberger, Werner SkrotzkiAbstract:Abstract YAg belongs to the family of B2-type rare earth intermetallic compounds that in polycrystalline form exhibit moderate low temperature Ductility. In this work, YAg single crystals have been deformed at low temperatures down to 4 K. The activation parameters and their dependence on stress and temperature, as well as the comparison with the deformation behavior of polycrystalline YAg, indicate that the cutting of forest dislocations is the rate-controlling deformation mechanism, similar to face-centered cubic metals. The results suggest that the low yield stress and high work-hardening rate observed cause the moderate Ductility at low temperatures.
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Low Temperature Deformation Mechanisms of Single Crystalline Intermetallic Compound Yag
SSRN Electronic Journal, 2020Co-Authors: R. Schaarschuch, Carl-georg Oertel, Guanghui Cao, Jens Freudenberger, Werner SkrotzkiAbstract:YAg belongs to the family of B2-type rare earth intermetallic compounds that in polycrystalline form exhibit moderate low temperature Ductility. In this work, YAg single crystals have been deformed at low temperatures down to 4 K at which significant Ductility was observed. The activation parameters and their dependence on stress and temperature, as well as the comparison with the deformation behavior of polycrystalline YAg, indicate that the cutting of forest dislocations is the rate-controlling deformation mechanism, similar to face-centered cubic metals. The results suggest that a low Peierls stress causes the moderate Ductility at low temperatures.
A. S. Gordeev - One of the best experts on this subject based on the ideXlab platform.
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Texture of the Mg-0.49% Al-0.47% Ca alloy after equal-channel angular pressing
Russian Metallurgy (Metally), 2008Co-Authors: V. N. Serebryany, T. M. Ivanova, A. S. Gordeev, M. V. Popov, V. N. Timofeev, L. L. Rokhlin, S. V. DobatkinAbstract:Equal-channel angular pressing (ECAP) is used to refine grains and to change the texture of the initial pressed Mg-0.49% Al-0.47% Ca alloy rod in order to study the possibility of increasing the Low-Temperature Ductility of the alloy. ECAP is performed at 300°C in six passes at a total true logarithmic strain ε = 6.8 according to route B _ C . As a result, an ultrafine-grained structure with a grain size of 2–5 μm forms. The initial texture of the pressed rod is characterized by the [12 11] axial orientation parallel to the pressing direction. After ECAP, the texture changes its type and is characterized by a set of preferred orientations that represent basal planes located at an angle of 40°–50° with respect to the pressing direction. An analysis of the generalized Schmid factors, which were calculated for the main operating deformation systems with allowance for the critical shear stresses in them and the volume fractions of the preferred orientations, indicates that the texture caused by ECAP affects the decrease in the strength properties of the alloy measured at room temperature and the increase in the Low-Temperature Ductility of the alloy.
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Texture of the Mg-0.49% Al-0.47% Ca alloy after equal-channel angular pressing
Russian Metallurgy (Metally), 2008Co-Authors: V. N. Serebryany, T. M. Ivanova, A. S. Gordeev, M. V. Popov, V. N. Timofeev, L. L. Rokhlin, S. V. DobatkinAbstract:Equal-channel angular pressing (ECAP) is used to refine grains and to change the texture of the initial pressed Mg-0.49% Al-0.47% Ca alloy rod in order to study the possibility of increasing the Low-Temperature Ductility of the alloy. ECAP is performed at 300°C in six passes at a total true logarithmic strain e = 6.8 according to route BC. As a result, an ultrafine-grained structure with a grain size of 2–5 μm forms. The initial texture of the pressed rod is characterized by the [12 11] axial orientation parallel to the pressing direction. After ECAP, the texture changes its type and is characterized by a set of preferred orientations that represent basal planes located at an angle of 40°–50° with respect to the pressing direction. An analysis of the generalized Schmid factors, which were calculated for the main operating deformation systems with allowance for the critical shear stresses in them and the volume fractions of the preferred orientations, indicates that the texture caused by ECAP affects the decrease in the strength properties of the alloy measured at room temperature and the increase in the Low-Temperature Ductility of the alloy.
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Effect of Texture and Microstructure on Ductility of a Mg-Al-Ca Alloy Processed by Equal Channel Angular Pressing
Materials Science Forum, 2008Co-Authors: V. N. Serebryany, A. S. Gordeev, V. N. Timofeev, L. L. Rokhlin, Michail V Popov, Yuri Estrin, Sergey V. DobatkinAbstract:Texture and microstructure formation during equal channel angular pressing (ECAP) of Mg-0.49%Al-0.47%Ca alloy were studied. The selected ECAP condition (route BC, N=6 passes, true strain e ≈ 6.8, T=300°C) ensures an ultrafine-grained structure of the alloy and basal texture, inclined at an angle of 45-55o relative to the direction of extrusion. The expectation that such a change of the texture, together with the refinement of microstructure, should improve the low temperature Ductility of this material was confirmed by tensile testing.
