The Experts below are selected from a list of 230208 Experts worldwide ranked by ideXlab platform
R Z Valiev - One of the best experts on this subject based on the ideXlab platform.
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mechanical and electrical properties of an ultrafine grained al 8 5 wt re re 5 4 wt ce 3 1 wt la alloy processed by severe plastic deformation
Materials & Design, 2016Co-Authors: Yu M Murashkin, N A Enikeev, R Z Valiev, I Sabirov, A E Medvedev, W Lefebvre, X SauvageAbstract:Abstract This work focuses on the effect of high pressure torsion (HPT) on the thermostability, microstructure, mechanical properties and electrical conductivity of an Al–8.5 wt.% RE (RE stands for rare earth Ce and La in the present case) alloy with respect to its potential application in electrical engineering. HPT processing leads to the formation of a very homogeneous ultra-fine grained microstructure resulting from the fragmentation of RE-rich intermetallic particles down to the Nanoscale. Deformation induced supersaturated solid solution of RE atoms in the Al matrix is demonstrated for the first time. The HPT processed material shows an extraordinary high mechanical strength attributed to the high volume fraction of Nanoscaled intermetallic particles and the ultrafine grained (UFG) microstructure. The various strengthening contributions were analyzed, and it was shown that the increase of strength during short time annealing could be attributed to the clustering of RE atoms in solid solution. The HPT processing induces a significant reduction of the electrical conductivity, but it was partly restored by annealing thanks to the concomitant clustering of RE atoms, reduction of dislocation density and grain growth. The potential applications of UFG Al–RE alloys in electrical engineering are finally discussed.
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mechanical and electrical properties of an ultrafine grained al 8 5 wt re re 5 4 wt ce 3 1 wt la alloy processed by severe plastic deformation
Materials & Design, 2016Co-Authors: Yu M Murashkin, N A Enikeev, R Z Valiev, I Sabirov, A E Medvedev, W Lefebvre, Xavier SauvageAbstract:Abstract This work focuses on the effect of high pressure torsion (HPT) on the thermostability, microstructure, mechanical properties and electrical conductivity of an Al–8.5 wt.% RE (RE stands for rare earth Ce and La in the present case) alloy with respect to its potential application in electrical engineering. HPT processing leads to the formation of a very homogeneous ultra-fine grained microstructure resulting from the fragmentation of RE-rich intermetallic particles down to the Nanoscale. Deformation induced supersaturated solid solution of RE atoms in the Al matrix is demonstrated for the first time. The HPT processed material shows an extraordinary high mechanical strength attributed to the high volume fraction of Nanoscaled intermetallic particles and the ultrafine grained (UFG) microstructure. The various strengthening contributions were analyzed, and it was shown that the increase of strength during short time annealing could be attributed to the clustering of RE atoms in solid solution. The HPT processing induces a significant reduction of the electrical conductivity, but it was partly restored by annealing thanks to the concomitant clustering of RE atoms, reduction of dislocation density and grain growth. The potential applications of UFG Al–RE alloys in electrical engineering are finally discussed.
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optimization of electrical conductivity and strength combination by structure design at the Nanoscale in al mg si alloys
Acta Materialia, 2015Co-Authors: X Sauvage, E V Bobruk, Yu M Murashkin, Y Nasedkina, N A Enikeev, R Z ValievAbstract:Abstract The contribution of ultrafine grains and Nanoscaled precipitates has been investigated in the Al–Mg–Si system to optimize the combination of strength and electrical conductivity. A full range of Nanoscaled structures was achieved by varying severe plastic deformation and post-processing precipitation treatments. Nanoscaled features, like grain size, solute content of the matrix, precipitate size, density or distribution were quantitatively estimated by analytical transmission electron microscopy and atom probe tomography. Deformation induced precipitation and grain boundary segregations are reported here and the physical origins are discussed. The concomitant grain growth and precipitation mechanisms that occur during post deformation aging treatment have also been investigated. Then, the quantitative data obtained from the Nanoscale characterization of ultrafine grain structures allowed adjusting physical models to account both for the mechanical strength and the electrical conductivity. Based on this approach, the range of properties achievable in Al–Mg–Si alloys was estimated.
Yu M Murashkin - One of the best experts on this subject based on the ideXlab platform.
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mechanical and electrical properties of an ultrafine grained al 8 5 wt re re 5 4 wt ce 3 1 wt la alloy processed by severe plastic deformation
Materials & Design, 2016Co-Authors: Yu M Murashkin, N A Enikeev, R Z Valiev, I Sabirov, A E Medvedev, W Lefebvre, X SauvageAbstract:Abstract This work focuses on the effect of high pressure torsion (HPT) on the thermostability, microstructure, mechanical properties and electrical conductivity of an Al–8.5 wt.% RE (RE stands for rare earth Ce and La in the present case) alloy with respect to its potential application in electrical engineering. HPT processing leads to the formation of a very homogeneous ultra-fine grained microstructure resulting from the fragmentation of RE-rich intermetallic particles down to the Nanoscale. Deformation induced supersaturated solid solution of RE atoms in the Al matrix is demonstrated for the first time. The HPT processed material shows an extraordinary high mechanical strength attributed to the high volume fraction of Nanoscaled intermetallic particles and the ultrafine grained (UFG) microstructure. The various strengthening contributions were analyzed, and it was shown that the increase of strength during short time annealing could be attributed to the clustering of RE atoms in solid solution. The HPT processing induces a significant reduction of the electrical conductivity, but it was partly restored by annealing thanks to the concomitant clustering of RE atoms, reduction of dislocation density and grain growth. The potential applications of UFG Al–RE alloys in electrical engineering are finally discussed.
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mechanical and electrical properties of an ultrafine grained al 8 5 wt re re 5 4 wt ce 3 1 wt la alloy processed by severe plastic deformation
Materials & Design, 2016Co-Authors: Yu M Murashkin, N A Enikeev, R Z Valiev, I Sabirov, A E Medvedev, W Lefebvre, Xavier SauvageAbstract:Abstract This work focuses on the effect of high pressure torsion (HPT) on the thermostability, microstructure, mechanical properties and electrical conductivity of an Al–8.5 wt.% RE (RE stands for rare earth Ce and La in the present case) alloy with respect to its potential application in electrical engineering. HPT processing leads to the formation of a very homogeneous ultra-fine grained microstructure resulting from the fragmentation of RE-rich intermetallic particles down to the Nanoscale. Deformation induced supersaturated solid solution of RE atoms in the Al matrix is demonstrated for the first time. The HPT processed material shows an extraordinary high mechanical strength attributed to the high volume fraction of Nanoscaled intermetallic particles and the ultrafine grained (UFG) microstructure. The various strengthening contributions were analyzed, and it was shown that the increase of strength during short time annealing could be attributed to the clustering of RE atoms in solid solution. The HPT processing induces a significant reduction of the electrical conductivity, but it was partly restored by annealing thanks to the concomitant clustering of RE atoms, reduction of dislocation density and grain growth. The potential applications of UFG Al–RE alloys in electrical engineering are finally discussed.
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optimization of electrical conductivity and strength combination by structure design at the Nanoscale in al mg si alloys
Acta Materialia, 2015Co-Authors: X Sauvage, E V Bobruk, Yu M Murashkin, Y Nasedkina, N A Enikeev, R Z ValievAbstract:Abstract The contribution of ultrafine grains and Nanoscaled precipitates has been investigated in the Al–Mg–Si system to optimize the combination of strength and electrical conductivity. A full range of Nanoscaled structures was achieved by varying severe plastic deformation and post-processing precipitation treatments. Nanoscaled features, like grain size, solute content of the matrix, precipitate size, density or distribution were quantitatively estimated by analytical transmission electron microscopy and atom probe tomography. Deformation induced precipitation and grain boundary segregations are reported here and the physical origins are discussed. The concomitant grain growth and precipitation mechanisms that occur during post deformation aging treatment have also been investigated. Then, the quantitative data obtained from the Nanoscale characterization of ultrafine grain structures allowed adjusting physical models to account both for the mechanical strength and the electrical conductivity. Based on this approach, the range of properties achievable in Al–Mg–Si alloys was estimated.
N A Enikeev - One of the best experts on this subject based on the ideXlab platform.
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mechanical and electrical properties of an ultrafine grained al 8 5 wt re re 5 4 wt ce 3 1 wt la alloy processed by severe plastic deformation
Materials & Design, 2016Co-Authors: Yu M Murashkin, N A Enikeev, R Z Valiev, I Sabirov, A E Medvedev, W Lefebvre, X SauvageAbstract:Abstract This work focuses on the effect of high pressure torsion (HPT) on the thermostability, microstructure, mechanical properties and electrical conductivity of an Al–8.5 wt.% RE (RE stands for rare earth Ce and La in the present case) alloy with respect to its potential application in electrical engineering. HPT processing leads to the formation of a very homogeneous ultra-fine grained microstructure resulting from the fragmentation of RE-rich intermetallic particles down to the Nanoscale. Deformation induced supersaturated solid solution of RE atoms in the Al matrix is demonstrated for the first time. The HPT processed material shows an extraordinary high mechanical strength attributed to the high volume fraction of Nanoscaled intermetallic particles and the ultrafine grained (UFG) microstructure. The various strengthening contributions were analyzed, and it was shown that the increase of strength during short time annealing could be attributed to the clustering of RE atoms in solid solution. The HPT processing induces a significant reduction of the electrical conductivity, but it was partly restored by annealing thanks to the concomitant clustering of RE atoms, reduction of dislocation density and grain growth. The potential applications of UFG Al–RE alloys in electrical engineering are finally discussed.
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mechanical and electrical properties of an ultrafine grained al 8 5 wt re re 5 4 wt ce 3 1 wt la alloy processed by severe plastic deformation
Materials & Design, 2016Co-Authors: Yu M Murashkin, N A Enikeev, R Z Valiev, I Sabirov, A E Medvedev, W Lefebvre, Xavier SauvageAbstract:Abstract This work focuses on the effect of high pressure torsion (HPT) on the thermostability, microstructure, mechanical properties and electrical conductivity of an Al–8.5 wt.% RE (RE stands for rare earth Ce and La in the present case) alloy with respect to its potential application in electrical engineering. HPT processing leads to the formation of a very homogeneous ultra-fine grained microstructure resulting from the fragmentation of RE-rich intermetallic particles down to the Nanoscale. Deformation induced supersaturated solid solution of RE atoms in the Al matrix is demonstrated for the first time. The HPT processed material shows an extraordinary high mechanical strength attributed to the high volume fraction of Nanoscaled intermetallic particles and the ultrafine grained (UFG) microstructure. The various strengthening contributions were analyzed, and it was shown that the increase of strength during short time annealing could be attributed to the clustering of RE atoms in solid solution. The HPT processing induces a significant reduction of the electrical conductivity, but it was partly restored by annealing thanks to the concomitant clustering of RE atoms, reduction of dislocation density and grain growth. The potential applications of UFG Al–RE alloys in electrical engineering are finally discussed.
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optimization of electrical conductivity and strength combination by structure design at the Nanoscale in al mg si alloys
Acta Materialia, 2015Co-Authors: X Sauvage, E V Bobruk, Yu M Murashkin, Y Nasedkina, N A Enikeev, R Z ValievAbstract:Abstract The contribution of ultrafine grains and Nanoscaled precipitates has been investigated in the Al–Mg–Si system to optimize the combination of strength and electrical conductivity. A full range of Nanoscaled structures was achieved by varying severe plastic deformation and post-processing precipitation treatments. Nanoscaled features, like grain size, solute content of the matrix, precipitate size, density or distribution were quantitatively estimated by analytical transmission electron microscopy and atom probe tomography. Deformation induced precipitation and grain boundary segregations are reported here and the physical origins are discussed. The concomitant grain growth and precipitation mechanisms that occur during post deformation aging treatment have also been investigated. Then, the quantitative data obtained from the Nanoscale characterization of ultrafine grain structures allowed adjusting physical models to account both for the mechanical strength and the electrical conductivity. Based on this approach, the range of properties achievable in Al–Mg–Si alloys was estimated.
X Sauvage - One of the best experts on this subject based on the ideXlab platform.
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mechanical and electrical properties of an ultrafine grained al 8 5 wt re re 5 4 wt ce 3 1 wt la alloy processed by severe plastic deformation
Materials & Design, 2016Co-Authors: Yu M Murashkin, N A Enikeev, R Z Valiev, I Sabirov, A E Medvedev, W Lefebvre, X SauvageAbstract:Abstract This work focuses on the effect of high pressure torsion (HPT) on the thermostability, microstructure, mechanical properties and electrical conductivity of an Al–8.5 wt.% RE (RE stands for rare earth Ce and La in the present case) alloy with respect to its potential application in electrical engineering. HPT processing leads to the formation of a very homogeneous ultra-fine grained microstructure resulting from the fragmentation of RE-rich intermetallic particles down to the Nanoscale. Deformation induced supersaturated solid solution of RE atoms in the Al matrix is demonstrated for the first time. The HPT processed material shows an extraordinary high mechanical strength attributed to the high volume fraction of Nanoscaled intermetallic particles and the ultrafine grained (UFG) microstructure. The various strengthening contributions were analyzed, and it was shown that the increase of strength during short time annealing could be attributed to the clustering of RE atoms in solid solution. The HPT processing induces a significant reduction of the electrical conductivity, but it was partly restored by annealing thanks to the concomitant clustering of RE atoms, reduction of dislocation density and grain growth. The potential applications of UFG Al–RE alloys in electrical engineering are finally discussed.
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optimization of electrical conductivity and strength combination by structure design at the Nanoscale in al mg si alloys
Acta Materialia, 2015Co-Authors: X Sauvage, E V Bobruk, Yu M Murashkin, Y Nasedkina, N A Enikeev, R Z ValievAbstract:Abstract The contribution of ultrafine grains and Nanoscaled precipitates has been investigated in the Al–Mg–Si system to optimize the combination of strength and electrical conductivity. A full range of Nanoscaled structures was achieved by varying severe plastic deformation and post-processing precipitation treatments. Nanoscaled features, like grain size, solute content of the matrix, precipitate size, density or distribution were quantitatively estimated by analytical transmission electron microscopy and atom probe tomography. Deformation induced precipitation and grain boundary segregations are reported here and the physical origins are discussed. The concomitant grain growth and precipitation mechanisms that occur during post deformation aging treatment have also been investigated. Then, the quantitative data obtained from the Nanoscale characterization of ultrafine grain structures allowed adjusting physical models to account both for the mechanical strength and the electrical conductivity. Based on this approach, the range of properties achievable in Al–Mg–Si alloys was estimated.
Marcos David Ferreira - One of the best experts on this subject based on the ideXlab platform.
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Nanoscaled Platforms Based on SiO_2 and Al_2O_3 Impregnated with Potassium Permanganate Use Color Changes to Indicate Ethylene Removal
Food and Bioprocess Technology, 2017Co-Authors: Poliana Cristina Spricigo, Milene Mitsuyuki Foschini, Caue Ribeiro, Daniel S Correa, Marcos David FerreiraAbstract:The development of novel tools/devices to monitor and oxidize ethylene (C_2H_4), a volatile compound responsible for the ripening and senescence in plants, can be a potential approach to maintain and provide information on the postharvest quality of fruits and vegetables. Here, we propose Nanoscaled platforms based on silica (SiO_2) and alumina (Al_2O_3) nanoparticles impregnated with potassium permanganate (KMnO_4) that use color changes to indicate ethylene removal. SiO_2 and Al_2O_3 in the microscale and Nanoscale were impregnated with varied concentrations of KMnO_4 through a simple mixture route, which systems were capable of oxidizing the ethylene in a closed atmosphere under relative humidity of 45, 60, 75, and 90%. Ethylene removal and color changes were monitored using gas chromatography and colorimetry, respectively. The Nanoscaled platforms impregnated with KMnO_4 were capable of scavenging ethylene more efficiently for 1-h exposure. Additionally, the color changes experienced by the Nanoscaled platforms, arising from the chemical reduction of potassium permanganate, function as an indicator of ethylene removal, which is particularly suitable for postharvest application.
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Nanoscaled platforms based on sio2 and al2o3 impregnated with potassium permanganate use color changes to indicate ethylene removal
Food and Bioprocess Technology, 2017Co-Authors: Poliana Cristina Spricigo, Milene Mitsuyuki Foschini, Caue Ribeiro, Daniel S Correa, Marcos David FerreiraAbstract:The development of novel tools/devices to monitor and oxidize ethylene (C2H4), a volatile compound responsible for the ripening and senescence in plants, can be a potential approach to maintain and provide information on the postharvest quality of fruits and vegetables. Here, we propose Nanoscaled platforms based on silica (SiO2) and alumina (Al2O3) nanoparticles impregnated with potassium permanganate (KMnO4) that use color changes to indicate ethylene removal. SiO2 and Al2O3 in the microscale and Nanoscale were impregnated with varied concentrations of KMnO4 through a simple mixture route, which systems were capable of oxidizing the ethylene in a closed atmosphere under relative humidity of 45, 60, 75, and 90%. Ethylene removal and color changes were monitored using gas chromatography and colorimetry, respectively. The Nanoscaled platforms impregnated with KMnO4 were capable of scavenging ethylene more efficiently for 1-h exposure. Additionally, the color changes experienced by the Nanoscaled platforms, arising from the chemical reduction of potassium permanganate, function as an indicator of ethylene removal, which is particularly suitable for postharvest application.
