The Experts below are selected from a list of 120771 Experts worldwide ranked by ideXlab platform
Erde Wang - One of the best experts on this subject based on the ideXlab platform.
-
Weakened anisotropy of mechanical properties in rolled ZK60 magnesium alloy sheets with elevated Deformation Temperature
Journal of Materials Science & Technology, 2018Co-Authors: Wenke Wang, Wenzhen Chen, Wencong Zhang, Guorong Cui, Erde WangAbstract:Abstract The rolling direction (RD) and the transverse direction (TD) samples were obtained from an as-rolled ZK60 magnesium alloy sheet with strong anisotropy of initial texture and their mechanical properties were tested at various Deformation Temperatures. Meanwhile, the microstructure and texture of these samples after fracture were investigated. Results revealed that a higher flow stress along the RD than that along the TD at room Temperature were ascribed to the strong anisotropy of transitional texture, and this texture effect was remarkably weakened with the increase of Deformation Temperature. Deformation structure was dominant at 100 °C, and was replaced by dynamic recrystallization structure when the Deformation Temperature increased to 200 °C and 300 °C. The texture presented a strong texture (transitional texture in the RD sample and basal texture in the TD sample) at 100 °C, but its intensity visibly decreased and texture components became more disperse at 200 °C and 300 °C. These microstructure and texture results were employed in conjunction with calculated results to argue that raising Deformation Temperature could increase the activity of non-basal slip by tailoring the relative critical resolved shear stress of each Deformation mode and finally result in low texture effect on mechanical anisotropy.
-
Effect of Deformation Temperature on texture and mechanical properties of ZK60 magnesium alloy sheet rolled by multi-pass lowered-Temperature rolling
Materials Science and Engineering: A, 2018Co-Authors: Wenke Wang, Wenzhen Chen, Wencong Zhang, Guorong Cui, Erde WangAbstract:Abstract ZK60 magnesium alloy sheets with various texture states were successfully fabricated by controlling the rolling Temperature in multi-pass lowered-Temperature rolling. The microstructure including texture and the mechanical properties of the resulting sheets were investigated. Results showed that dynamic recrystallization (DRX) during current rolling process could be realized at lower Deformation Temperature when the thickness reduction per pass was larger than 30%, and with its help, the grain size was significantly refined and the microstructure homogeneity strikingly improved. In this circumstance, Deformation Temperature mainly influenced the texture state of the resulting sheets, implying that with the increase of Deformation Temperature the distribution of (0002) basal planes remained stable along the rolling direction but gradually increased along the transverse direction. The calculation results about the friction stress for various Deformation modes indicated that the changing ratios of the critical resolved shear stress (CRSS) for the non-basal slip to that for basal slip resulted in this texture difference. Additionally, for the samples with the dominant Deformation mode of basal slip, the yield stress gradually decreased and the uniform elongation increased with the weakening of basal texture. However, if dominant Deformation mode changed, an abrupt change would occur in their values. This change of yield stress came from the change of CRSS, while uniform elongation from strain hardening rate.
Wenke Wang - One of the best experts on this subject based on the ideXlab platform.
-
Weakened anisotropy of mechanical properties in rolled ZK60 magnesium alloy sheets with elevated Deformation Temperature
Journal of Materials Science & Technology, 2018Co-Authors: Wenke Wang, Wenzhen Chen, Wencong Zhang, Guorong Cui, Erde WangAbstract:Abstract The rolling direction (RD) and the transverse direction (TD) samples were obtained from an as-rolled ZK60 magnesium alloy sheet with strong anisotropy of initial texture and their mechanical properties were tested at various Deformation Temperatures. Meanwhile, the microstructure and texture of these samples after fracture were investigated. Results revealed that a higher flow stress along the RD than that along the TD at room Temperature were ascribed to the strong anisotropy of transitional texture, and this texture effect was remarkably weakened with the increase of Deformation Temperature. Deformation structure was dominant at 100 °C, and was replaced by dynamic recrystallization structure when the Deformation Temperature increased to 200 °C and 300 °C. The texture presented a strong texture (transitional texture in the RD sample and basal texture in the TD sample) at 100 °C, but its intensity visibly decreased and texture components became more disperse at 200 °C and 300 °C. These microstructure and texture results were employed in conjunction with calculated results to argue that raising Deformation Temperature could increase the activity of non-basal slip by tailoring the relative critical resolved shear stress of each Deformation mode and finally result in low texture effect on mechanical anisotropy.
-
Effect of Deformation Temperature on texture and mechanical properties of ZK60 magnesium alloy sheet rolled by multi-pass lowered-Temperature rolling
Materials Science and Engineering: A, 2018Co-Authors: Wenke Wang, Wenzhen Chen, Wencong Zhang, Guorong Cui, Erde WangAbstract:Abstract ZK60 magnesium alloy sheets with various texture states were successfully fabricated by controlling the rolling Temperature in multi-pass lowered-Temperature rolling. The microstructure including texture and the mechanical properties of the resulting sheets were investigated. Results showed that dynamic recrystallization (DRX) during current rolling process could be realized at lower Deformation Temperature when the thickness reduction per pass was larger than 30%, and with its help, the grain size was significantly refined and the microstructure homogeneity strikingly improved. In this circumstance, Deformation Temperature mainly influenced the texture state of the resulting sheets, implying that with the increase of Deformation Temperature the distribution of (0002) basal planes remained stable along the rolling direction but gradually increased along the transverse direction. The calculation results about the friction stress for various Deformation modes indicated that the changing ratios of the critical resolved shear stress (CRSS) for the non-basal slip to that for basal slip resulted in this texture difference. Additionally, for the samples with the dominant Deformation mode of basal slip, the yield stress gradually decreased and the uniform elongation increased with the weakening of basal texture. However, if dominant Deformation mode changed, an abrupt change would occur in their values. This change of yield stress came from the change of CRSS, while uniform elongation from strain hardening rate.
I B Trubitsyna - One of the best experts on this subject based on the ideXlab platform.
-
Studies of composition, Deformation Temperature and pressure effects on structure formation in severely deformed TiNi-based alloys
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2006Co-Authors: I.yu. Khmelevskaya, E V Tatyanin, S D Prokoshkin, Sergey V. Dobatkin, I B TrubitsynaAbstract:Abstract Structure formation in TiNi-based shape memory alloys in dependence on Deformation Temperature (−196 to 400 °C) and pressure (4–8 GPa) under conditions of high-pressure torsion (HPT) was studied using transmission electron microscopy and X-ray diffraction methods. The tendency to form an amorphous structure depends on the relative positions of the Deformation Temperature and the martensite start Temperature. Isothermal martensitic transformation is observed in the Ti–48.5 at.% Ni alloy as a result of 10-year keeping at room Temperature after HPT. Increasing of pressure suppresses the tendency to form an amorphous structure. The upper Deformation Temperature limits for amorphous and nanocrystalline structures formation are determined. The thermomechanical conditions of the equal-channel angular pressing for obtaining actual nanocrystalline structure are recommended.
-
alloy composition Deformation Temperature pressure and post Deformation annealing effects in severely deformed ti ni based shape memory alloys
Acta Materialia, 2005Co-Authors: S D Prokoshkin, I B Trubitsyna, Yurevna Irina Khmelevskaya, E V Tatyanin, Sergey V. Dobatkin, Vladimir V. Stolyarov, Egor ProkofievAbstract:Structure formation in Ti-48.5, Ti-50.0, Ti-50.7 at.% Ni and Ti-47 at.% Ni-3 at.% Fe shape memory alloys depending on Deformation Temperature (−196 to 400 °C) and pressure (4–8 GPa) under conditions of high-pressure torsion and post-Deformation annealing (200–400 °C) was studied using transmission electron microscopy and X-ray diffraction methods. The tendency to form an amorphous structure depends on the relative values of the Deformation Temperature and martensite start (Ms) Temperature as follows: it is strongest in initially martensitic alloy, intermediate in a premartensitic austenite, and the weakest in initially thermally stable austenitic alloy. Lowering of the Deformation Temperature in the range below the martensite finish (Mf) Temperature facilitates amorphization. Raising of the Deformation Temperature in the austenitic Temperature range suppresses amorphization. The upper limiting Deformation Temperature for partial amorphization of the alloy having the highest Ms is located about 300 °C. The upper limiting Deformation Temperature for actually nanocrystalline structure formation is located about 350 °C for non-aging Ti–Ni alloys and somewhat higher than 400 °C for aged Ti–Ni alloy. The thermomechanical conditions of the equal-channel angular pressing for obtaining actually nanocrystalline structure are recommended. Isothermal martensitic transformation is observed in the Ti-48.5 at.% Ni alloy as a result of keeping for 10 year at room Temperature after high-Temperature severe plastic Deformation. Increasing the pressure suppresses the tendency to form an amorphous structure. The nanocrystalline structure formed under post-Deformation annealing from the amorphous structure remains finer than the nanostructure formed as a result of severe plastic Deformation through the annealing Temperature range covering a nano-grain size scale.
Wenzhen Chen - One of the best experts on this subject based on the ideXlab platform.
-
Weakened anisotropy of mechanical properties in rolled ZK60 magnesium alloy sheets with elevated Deformation Temperature
Journal of Materials Science & Technology, 2018Co-Authors: Wenke Wang, Wenzhen Chen, Wencong Zhang, Guorong Cui, Erde WangAbstract:Abstract The rolling direction (RD) and the transverse direction (TD) samples were obtained from an as-rolled ZK60 magnesium alloy sheet with strong anisotropy of initial texture and their mechanical properties were tested at various Deformation Temperatures. Meanwhile, the microstructure and texture of these samples after fracture were investigated. Results revealed that a higher flow stress along the RD than that along the TD at room Temperature were ascribed to the strong anisotropy of transitional texture, and this texture effect was remarkably weakened with the increase of Deformation Temperature. Deformation structure was dominant at 100 °C, and was replaced by dynamic recrystallization structure when the Deformation Temperature increased to 200 °C and 300 °C. The texture presented a strong texture (transitional texture in the RD sample and basal texture in the TD sample) at 100 °C, but its intensity visibly decreased and texture components became more disperse at 200 °C and 300 °C. These microstructure and texture results were employed in conjunction with calculated results to argue that raising Deformation Temperature could increase the activity of non-basal slip by tailoring the relative critical resolved shear stress of each Deformation mode and finally result in low texture effect on mechanical anisotropy.
-
Effect of Deformation Temperature on texture and mechanical properties of ZK60 magnesium alloy sheet rolled by multi-pass lowered-Temperature rolling
Materials Science and Engineering: A, 2018Co-Authors: Wenke Wang, Wenzhen Chen, Wencong Zhang, Guorong Cui, Erde WangAbstract:Abstract ZK60 magnesium alloy sheets with various texture states were successfully fabricated by controlling the rolling Temperature in multi-pass lowered-Temperature rolling. The microstructure including texture and the mechanical properties of the resulting sheets were investigated. Results showed that dynamic recrystallization (DRX) during current rolling process could be realized at lower Deformation Temperature when the thickness reduction per pass was larger than 30%, and with its help, the grain size was significantly refined and the microstructure homogeneity strikingly improved. In this circumstance, Deformation Temperature mainly influenced the texture state of the resulting sheets, implying that with the increase of Deformation Temperature the distribution of (0002) basal planes remained stable along the rolling direction but gradually increased along the transverse direction. The calculation results about the friction stress for various Deformation modes indicated that the changing ratios of the critical resolved shear stress (CRSS) for the non-basal slip to that for basal slip resulted in this texture difference. Additionally, for the samples with the dominant Deformation mode of basal slip, the yield stress gradually decreased and the uniform elongation increased with the weakening of basal texture. However, if dominant Deformation mode changed, an abrupt change would occur in their values. This change of yield stress came from the change of CRSS, while uniform elongation from strain hardening rate.
Wencong Zhang - One of the best experts on this subject based on the ideXlab platform.
-
Weakened anisotropy of mechanical properties in rolled ZK60 magnesium alloy sheets with elevated Deformation Temperature
Journal of Materials Science & Technology, 2018Co-Authors: Wenke Wang, Wenzhen Chen, Wencong Zhang, Guorong Cui, Erde WangAbstract:Abstract The rolling direction (RD) and the transverse direction (TD) samples were obtained from an as-rolled ZK60 magnesium alloy sheet with strong anisotropy of initial texture and their mechanical properties were tested at various Deformation Temperatures. Meanwhile, the microstructure and texture of these samples after fracture were investigated. Results revealed that a higher flow stress along the RD than that along the TD at room Temperature were ascribed to the strong anisotropy of transitional texture, and this texture effect was remarkably weakened with the increase of Deformation Temperature. Deformation structure was dominant at 100 °C, and was replaced by dynamic recrystallization structure when the Deformation Temperature increased to 200 °C and 300 °C. The texture presented a strong texture (transitional texture in the RD sample and basal texture in the TD sample) at 100 °C, but its intensity visibly decreased and texture components became more disperse at 200 °C and 300 °C. These microstructure and texture results were employed in conjunction with calculated results to argue that raising Deformation Temperature could increase the activity of non-basal slip by tailoring the relative critical resolved shear stress of each Deformation mode and finally result in low texture effect on mechanical anisotropy.
-
Effect of Deformation Temperature on texture and mechanical properties of ZK60 magnesium alloy sheet rolled by multi-pass lowered-Temperature rolling
Materials Science and Engineering: A, 2018Co-Authors: Wenke Wang, Wenzhen Chen, Wencong Zhang, Guorong Cui, Erde WangAbstract:Abstract ZK60 magnesium alloy sheets with various texture states were successfully fabricated by controlling the rolling Temperature in multi-pass lowered-Temperature rolling. The microstructure including texture and the mechanical properties of the resulting sheets were investigated. Results showed that dynamic recrystallization (DRX) during current rolling process could be realized at lower Deformation Temperature when the thickness reduction per pass was larger than 30%, and with its help, the grain size was significantly refined and the microstructure homogeneity strikingly improved. In this circumstance, Deformation Temperature mainly influenced the texture state of the resulting sheets, implying that with the increase of Deformation Temperature the distribution of (0002) basal planes remained stable along the rolling direction but gradually increased along the transverse direction. The calculation results about the friction stress for various Deformation modes indicated that the changing ratios of the critical resolved shear stress (CRSS) for the non-basal slip to that for basal slip resulted in this texture difference. Additionally, for the samples with the dominant Deformation mode of basal slip, the yield stress gradually decreased and the uniform elongation increased with the weakening of basal texture. However, if dominant Deformation mode changed, an abrupt change would occur in their values. This change of yield stress came from the change of CRSS, while uniform elongation from strain hardening rate.