The Experts below are selected from a list of 324 Experts worldwide ranked by ideXlab platform
S. D. Prokoshkin - One of the best experts on this subject based on the ideXlab platform.
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a comparative study of martensite crystal Lattice in nanostructured quenched and deformed ti ni shape memory alloys
ESOMAT 2009 - 8th European Symposium on Martensitic Transformations, 2009Co-Authors: S. D. Prokoshkin, A V Korotitskiy, Vladimir Brailovski, K Inaekyan, S M DubinskiyAbstract:The crystal Lattices of cooling-induced (thermal) martensites formed in thermally and thermomechanically treated Ti-Ni Shape Memory Alloys (SMA) and stress-induced, reoriented and plastically deformed martensites were studied using the X-ray diffraction method. The linear dependences of the TXHQFKHG�%��∂ -martensite Lattice Parameters (LPs), maximum transformation Lattice strain in single- and polycrystalline B2-austenites as well as its crystallographic direction on nickel concentration in the hyperequiatomic range are presented. The Lattice Parameters and maximum transformation Lattice strain of martensite formed from nanocrystalline or polygonized austenites differ from those of quenched martensite formed from recrystallized austenite. The averaged LPs of stress-induced, reoriented and moderately plastically deformed martensites are close to the Lattice Parameters of quenched martensite.
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effect of nanocrystalline structure and polygonized dislocation substructure on ti ni martensite Lattice Parameters and transformation Lattice strain
Materials Science Forum, 2008Co-Authors: S. D. Prokoshkin, A V Korotitskiy, Vladimir Brailovski, K InaekyanAbstract:The Ti-50.26 and 50.61at.%Ni alloys were cold-rolled with true strains from e=0.3 to 2.1. Post-deformation annealing in the 200 to 500°C temperature range after a moderate deformation (e=0.3) produced a polygonized dislocation substructure with various dislocation density and subgrain size, while after severe plastic deformation (e=1.7-1.9), a nanocrystalline structure with various grain size was formed in the B2-austenite. An X-ray diffraction study shows that Lattice Parameters of B19'-martensite formed from (a) partially recovered and polygonized or (b) nanocrystalline austenites differ from the corresponding Parameters of the martensite formed from quenched (recrystallized) austenite. This difference increases with nanocrystalline grain refinement and with an increase in residual dislocation density and subgrain refinement. The maximum martensitic transformation strain has the highest value for the martensite formed in recrystallized austenite, and this value decreases with nanograin refinement and with an increase in dislocation density and subgrain refinement.
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comparative x ray and time of flight neutron diffraction studies of martensite crystal Lattice in stressed and unstressed binary ti ni alloys
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2006Co-Authors: S. D. Prokoshkin, A V Korotitskiy, Vladimir Brailovski, A V Tamonov, Yu I Khmelevskaya, S TurenneAbstract:Abstract An X-ray and time-of-flight neutron diffraction study of a Ti–50.0 at.% Ni alloy was performed. The B19′ martensite Lattice Parameters are different for the quenched martensite and for the martensite formed from the austenite containing a well-developed dislocation substructure due to transformation-induced hardening. A tensile stress increases the “underrecovery” of the d h k l values of planes perpendicular to the axis of tension (and of the “apparent” martensite Lattice Parameters calculated from these d h k l values) after a cycle of transformation-induced hardening compared with the corresponding values of the initial quenched martensite. A probable cause for the differences between d h k l and Lattice Parameters of martensite formed from highly dislocated austenite and corresponding Parameters of quenched martensite formed from recrystallized austenite are tensile components of stress fields generated by the dislocation substructure and/or residual stresses of different origin which are present in the initial austenite.
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on the Lattice Parameters of phases in binary ti ni shape memory alloys
Acta Materialia, 2004Co-Authors: S. D. Prokoshkin, A V Korotitskiy, Vladimir Brailovski, Yu I Khmelevskaya, S Turenne, I B TrubitsynaAbstract:Abstract An X-ray diffractometry study of Ti–47.0 to 50.7 at.%Ni alloys was performed. In the 50.0–50.7 at.% range of nickel content, a concentration dependence of B19′-martensite Lattice Parameters (MLP) is observed. MLP are found to be identical for 47.0 and 50.0 at.% of nickel content. The temperature dependence of MLP is observed, and this dependence is enhanced in the reverse transformation temperature range for Ti–50.0 at.%Ni alloy. MLP are different for the quenched martensite and for the martensite formed from the austenite containing a well-developed dislocation substructure. It is proven that the presence of an intermediate R-phase during martensitic transformation is not responsible for the changes in MLP, observed in hyper-equiatomic alloys or in alloys having a highly dislocated austenite substructure. In the 50.0 at.%Ni alloy, no changes in MLP are observed after a 25% cold-deformation of the already formed thermal martensite.
Vladimir Brailovski - One of the best experts on this subject based on the ideXlab platform.
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a comparative study of martensite crystal Lattice in nanostructured quenched and deformed ti ni shape memory alloys
ESOMAT 2009 - 8th European Symposium on Martensitic Transformations, 2009Co-Authors: S. D. Prokoshkin, A V Korotitskiy, Vladimir Brailovski, K Inaekyan, S M DubinskiyAbstract:The crystal Lattices of cooling-induced (thermal) martensites formed in thermally and thermomechanically treated Ti-Ni Shape Memory Alloys (SMA) and stress-induced, reoriented and plastically deformed martensites were studied using the X-ray diffraction method. The linear dependences of the TXHQFKHG�%��∂ -martensite Lattice Parameters (LPs), maximum transformation Lattice strain in single- and polycrystalline B2-austenites as well as its crystallographic direction on nickel concentration in the hyperequiatomic range are presented. The Lattice Parameters and maximum transformation Lattice strain of martensite formed from nanocrystalline or polygonized austenites differ from those of quenched martensite formed from recrystallized austenite. The averaged LPs of stress-induced, reoriented and moderately plastically deformed martensites are close to the Lattice Parameters of quenched martensite.
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effect of nanocrystalline structure and polygonized dislocation substructure on ti ni martensite Lattice Parameters and transformation Lattice strain
Materials Science Forum, 2008Co-Authors: S. D. Prokoshkin, A V Korotitskiy, Vladimir Brailovski, K InaekyanAbstract:The Ti-50.26 and 50.61at.%Ni alloys were cold-rolled with true strains from e=0.3 to 2.1. Post-deformation annealing in the 200 to 500°C temperature range after a moderate deformation (e=0.3) produced a polygonized dislocation substructure with various dislocation density and subgrain size, while after severe plastic deformation (e=1.7-1.9), a nanocrystalline structure with various grain size was formed in the B2-austenite. An X-ray diffraction study shows that Lattice Parameters of B19'-martensite formed from (a) partially recovered and polygonized or (b) nanocrystalline austenites differ from the corresponding Parameters of the martensite formed from quenched (recrystallized) austenite. This difference increases with nanocrystalline grain refinement and with an increase in residual dislocation density and subgrain refinement. The maximum martensitic transformation strain has the highest value for the martensite formed in recrystallized austenite, and this value decreases with nanograin refinement and with an increase in dislocation density and subgrain refinement.
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comparative x ray and time of flight neutron diffraction studies of martensite crystal Lattice in stressed and unstressed binary ti ni alloys
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2006Co-Authors: S. D. Prokoshkin, A V Korotitskiy, Vladimir Brailovski, A V Tamonov, Yu I Khmelevskaya, S TurenneAbstract:Abstract An X-ray and time-of-flight neutron diffraction study of a Ti–50.0 at.% Ni alloy was performed. The B19′ martensite Lattice Parameters are different for the quenched martensite and for the martensite formed from the austenite containing a well-developed dislocation substructure due to transformation-induced hardening. A tensile stress increases the “underrecovery” of the d h k l values of planes perpendicular to the axis of tension (and of the “apparent” martensite Lattice Parameters calculated from these d h k l values) after a cycle of transformation-induced hardening compared with the corresponding values of the initial quenched martensite. A probable cause for the differences between d h k l and Lattice Parameters of martensite formed from highly dislocated austenite and corresponding Parameters of quenched martensite formed from recrystallized austenite are tensile components of stress fields generated by the dislocation substructure and/or residual stresses of different origin which are present in the initial austenite.
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on the Lattice Parameters of phases in binary ti ni shape memory alloys
Acta Materialia, 2004Co-Authors: S. D. Prokoshkin, A V Korotitskiy, Vladimir Brailovski, Yu I Khmelevskaya, S Turenne, I B TrubitsynaAbstract:Abstract An X-ray diffractometry study of Ti–47.0 to 50.7 at.%Ni alloys was performed. In the 50.0–50.7 at.% range of nickel content, a concentration dependence of B19′-martensite Lattice Parameters (MLP) is observed. MLP are found to be identical for 47.0 and 50.0 at.% of nickel content. The temperature dependence of MLP is observed, and this dependence is enhanced in the reverse transformation temperature range for Ti–50.0 at.%Ni alloy. MLP are different for the quenched martensite and for the martensite formed from the austenite containing a well-developed dislocation substructure. It is proven that the presence of an intermediate R-phase during martensitic transformation is not responsible for the changes in MLP, observed in hyper-equiatomic alloys or in alloys having a highly dislocated austenite substructure. In the 50.0 at.%Ni alloy, no changes in MLP are observed after a 25% cold-deformation of the already formed thermal martensite.
S Turenne - One of the best experts on this subject based on the ideXlab platform.
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comparative x ray and time of flight neutron diffraction studies of martensite crystal Lattice in stressed and unstressed binary ti ni alloys
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2006Co-Authors: S. D. Prokoshkin, A V Korotitskiy, Vladimir Brailovski, A V Tamonov, Yu I Khmelevskaya, S TurenneAbstract:Abstract An X-ray and time-of-flight neutron diffraction study of a Ti–50.0 at.% Ni alloy was performed. The B19′ martensite Lattice Parameters are different for the quenched martensite and for the martensite formed from the austenite containing a well-developed dislocation substructure due to transformation-induced hardening. A tensile stress increases the “underrecovery” of the d h k l values of planes perpendicular to the axis of tension (and of the “apparent” martensite Lattice Parameters calculated from these d h k l values) after a cycle of transformation-induced hardening compared with the corresponding values of the initial quenched martensite. A probable cause for the differences between d h k l and Lattice Parameters of martensite formed from highly dislocated austenite and corresponding Parameters of quenched martensite formed from recrystallized austenite are tensile components of stress fields generated by the dislocation substructure and/or residual stresses of different origin which are present in the initial austenite.
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on the Lattice Parameters of phases in binary ti ni shape memory alloys
Acta Materialia, 2004Co-Authors: S. D. Prokoshkin, A V Korotitskiy, Vladimir Brailovski, Yu I Khmelevskaya, S Turenne, I B TrubitsynaAbstract:Abstract An X-ray diffractometry study of Ti–47.0 to 50.7 at.%Ni alloys was performed. In the 50.0–50.7 at.% range of nickel content, a concentration dependence of B19′-martensite Lattice Parameters (MLP) is observed. MLP are found to be identical for 47.0 and 50.0 at.% of nickel content. The temperature dependence of MLP is observed, and this dependence is enhanced in the reverse transformation temperature range for Ti–50.0 at.%Ni alloy. MLP are different for the quenched martensite and for the martensite formed from the austenite containing a well-developed dislocation substructure. It is proven that the presence of an intermediate R-phase during martensitic transformation is not responsible for the changes in MLP, observed in hyper-equiatomic alloys or in alloys having a highly dislocated austenite substructure. In the 50.0 at.%Ni alloy, no changes in MLP are observed after a 25% cold-deformation of the already formed thermal martensite.
A V Korotitskiy - One of the best experts on this subject based on the ideXlab platform.
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a comparative study of martensite crystal Lattice in nanostructured quenched and deformed ti ni shape memory alloys
ESOMAT 2009 - 8th European Symposium on Martensitic Transformations, 2009Co-Authors: S. D. Prokoshkin, A V Korotitskiy, Vladimir Brailovski, K Inaekyan, S M DubinskiyAbstract:The crystal Lattices of cooling-induced (thermal) martensites formed in thermally and thermomechanically treated Ti-Ni Shape Memory Alloys (SMA) and stress-induced, reoriented and plastically deformed martensites were studied using the X-ray diffraction method. The linear dependences of the TXHQFKHG�%��∂ -martensite Lattice Parameters (LPs), maximum transformation Lattice strain in single- and polycrystalline B2-austenites as well as its crystallographic direction on nickel concentration in the hyperequiatomic range are presented. The Lattice Parameters and maximum transformation Lattice strain of martensite formed from nanocrystalline or polygonized austenites differ from those of quenched martensite formed from recrystallized austenite. The averaged LPs of stress-induced, reoriented and moderately plastically deformed martensites are close to the Lattice Parameters of quenched martensite.
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effect of nanocrystalline structure and polygonized dislocation substructure on ti ni martensite Lattice Parameters and transformation Lattice strain
Materials Science Forum, 2008Co-Authors: S. D. Prokoshkin, A V Korotitskiy, Vladimir Brailovski, K InaekyanAbstract:The Ti-50.26 and 50.61at.%Ni alloys were cold-rolled with true strains from e=0.3 to 2.1. Post-deformation annealing in the 200 to 500°C temperature range after a moderate deformation (e=0.3) produced a polygonized dislocation substructure with various dislocation density and subgrain size, while after severe plastic deformation (e=1.7-1.9), a nanocrystalline structure with various grain size was formed in the B2-austenite. An X-ray diffraction study shows that Lattice Parameters of B19'-martensite formed from (a) partially recovered and polygonized or (b) nanocrystalline austenites differ from the corresponding Parameters of the martensite formed from quenched (recrystallized) austenite. This difference increases with nanocrystalline grain refinement and with an increase in residual dislocation density and subgrain refinement. The maximum martensitic transformation strain has the highest value for the martensite formed in recrystallized austenite, and this value decreases with nanograin refinement and with an increase in dislocation density and subgrain refinement.
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comparative x ray and time of flight neutron diffraction studies of martensite crystal Lattice in stressed and unstressed binary ti ni alloys
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2006Co-Authors: S. D. Prokoshkin, A V Korotitskiy, Vladimir Brailovski, A V Tamonov, Yu I Khmelevskaya, S TurenneAbstract:Abstract An X-ray and time-of-flight neutron diffraction study of a Ti–50.0 at.% Ni alloy was performed. The B19′ martensite Lattice Parameters are different for the quenched martensite and for the martensite formed from the austenite containing a well-developed dislocation substructure due to transformation-induced hardening. A tensile stress increases the “underrecovery” of the d h k l values of planes perpendicular to the axis of tension (and of the “apparent” martensite Lattice Parameters calculated from these d h k l values) after a cycle of transformation-induced hardening compared with the corresponding values of the initial quenched martensite. A probable cause for the differences between d h k l and Lattice Parameters of martensite formed from highly dislocated austenite and corresponding Parameters of quenched martensite formed from recrystallized austenite are tensile components of stress fields generated by the dislocation substructure and/or residual stresses of different origin which are present in the initial austenite.
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on the Lattice Parameters of phases in binary ti ni shape memory alloys
Acta Materialia, 2004Co-Authors: S. D. Prokoshkin, A V Korotitskiy, Vladimir Brailovski, Yu I Khmelevskaya, S Turenne, I B TrubitsynaAbstract:Abstract An X-ray diffractometry study of Ti–47.0 to 50.7 at.%Ni alloys was performed. In the 50.0–50.7 at.% range of nickel content, a concentration dependence of B19′-martensite Lattice Parameters (MLP) is observed. MLP are found to be identical for 47.0 and 50.0 at.% of nickel content. The temperature dependence of MLP is observed, and this dependence is enhanced in the reverse transformation temperature range for Ti–50.0 at.%Ni alloy. MLP are different for the quenched martensite and for the martensite formed from the austenite containing a well-developed dislocation substructure. It is proven that the presence of an intermediate R-phase during martensitic transformation is not responsible for the changes in MLP, observed in hyper-equiatomic alloys or in alloys having a highly dislocated austenite substructure. In the 50.0 at.%Ni alloy, no changes in MLP are observed after a 25% cold-deformation of the already formed thermal martensite.
I B Trubitsyna - One of the best experts on this subject based on the ideXlab platform.
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on the Lattice Parameters of phases in binary ti ni shape memory alloys
Acta Materialia, 2004Co-Authors: S. D. Prokoshkin, A V Korotitskiy, Vladimir Brailovski, Yu I Khmelevskaya, S Turenne, I B TrubitsynaAbstract:Abstract An X-ray diffractometry study of Ti–47.0 to 50.7 at.%Ni alloys was performed. In the 50.0–50.7 at.% range of nickel content, a concentration dependence of B19′-martensite Lattice Parameters (MLP) is observed. MLP are found to be identical for 47.0 and 50.0 at.% of nickel content. The temperature dependence of MLP is observed, and this dependence is enhanced in the reverse transformation temperature range for Ti–50.0 at.%Ni alloy. MLP are different for the quenched martensite and for the martensite formed from the austenite containing a well-developed dislocation substructure. It is proven that the presence of an intermediate R-phase during martensitic transformation is not responsible for the changes in MLP, observed in hyper-equiatomic alloys or in alloys having a highly dislocated austenite substructure. In the 50.0 at.%Ni alloy, no changes in MLP are observed after a 25% cold-deformation of the already formed thermal martensite.