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Takayuki Takasugi - One of the best experts on this subject based on the ideXlab platform.
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further investigation on phase relation and microstructures in ni3si ni3ti ni3nb pseudo ternary Alloy System
Intermetallics, 2006Co-Authors: K Ohira, Yasuyuki Kaneno, Hiroshi Tsuda, Takayuki TakasugiAbstract:Abstract The isothermal phase diagram at 1323 K in the Ni3Si–Ni3Ti–Ni3Nb pseudo-ternary Alloy System was re-investigated by scanning electron microscopy (attached with a wavelength dispersive spectroscope), X-ray diffraction and transmission electron microscopy (TEM), focusing on the phase relation among possible geometrically-close-packed (GCP) Ni3X phases. The prepared Alloys exhibited widely different microstructures, depending on Alloy compositions whether they exist in a single phase, a two- or a three-phase region, and also on the constituent GCP Ni3X phases. The L12(Ni3Si), D024(Ni3Ti) and D0a(Ni3Nb) phases were directly equilibrated one another or each other when keeping Ni content 79.5 at.%. On the other hand, the D019(Ni3Ti0.7Nb0.3) phase was identified to exist when keeping Ni content 75 at.%. The phase stability and existing region of each GCP Ni3X phase identified in the Ni3Si–Ni3Ti–Ni3Nb pseudo-ternary Alloy System were discussed, based on the electron concentration (e/a) and the atomic size factor (Rx/RNi) of the constituent atoms.
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phase relation and microstructure in multi phase intermetallic Alloys based on ni3si ni3ti ni3nb pseudo ternary Alloy System
Intermetallics, 2004Co-Authors: Y Nunomura, Yasuyuki Kaneno, Hiroshi Tsuda, Takayuki TakasugiAbstract:Abstract The phase relation and microstructure of Alloys based on the Ni3Al–Ni3Ti–Ni3V pseudo-ternary Alloy System at 1273 and 1373 K were investigated by optical microscopy, X-ray diffraction, differential scanning calorimetry and scanning electron microscopy (attached with a wavelength dispersive spectroscope). As the constituent intermetallic phases at 1273 K, L12(Ni3Al), D024(Ni3Ti), D022(Ni3V) and rhombohedral (Ni3Ti0.7V0.3) were identified and then their phase fields were shown to depend upon the electron concentration (e/a) and the atomic size factor (Rx/RNi) of the constituent atoms. Among four intermetallic phases identified at 1273 K, five kinds of two-phase relations (i.e. L12–D024, D024–rhombohedral, rhombohedral–D022 D022–D024 and D022–L12) and two kinds of three-phase relations (i.e. L12–D024–D022 and D024–rhombohedral–D022) were found to exist. Also, D024 (Ni3Ti) phase extended up to concentration field in which a majority of constituent Ti elements were replaced by Al and V elements, keeping their concentrations identical. The prepared Alloys exhibited widely different microstructures, depending on Alloy composition and temperature. In the low Ti concentration region, dual multi-phase microstructures composed of L12+D024+A1(→L12+D022) were formed by a eutectic reaction.
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phase relation and microstructure in multi phase intermetallic Alloys based on ni3al ni3nb ni3v pseudo ternary Alloy System
Intermetallics, 2004Co-Authors: Y Nunomura, Yasuyuki Kaneno, Hiroshi Tsuda, Takayuki TakasugiAbstract:Abstract The phase relation and microstructure of Alloys based on the Ni3Al–Ni3Ti–Ni3V pseudo-ternary Alloy System at 1273 and 1373 K were investigated by optical microscopy, X-ray diffraction, differential scanning calorimetry and scanning electron microscopy (attached with a wavelength dispersive spectroscope). As the constituent intermetallic phases at 1273 K, L12(Ni3Al), D024(Ni3Ti), D022(Ni3V) and rhombohedral (Ni3Ti0.7V0.3) were identified and then their phase fields were shown to depend upon the electron concentration (e/a) and the atomic size factor (Rx/RNi) of the constituent atoms. Among four intermetallic phases identified at 1273 K, five kinds of two-phase relations (i.e. L12–D024, D024–rhombohedral, rhombohedral–D022 D022–D024 and D022–L12) and two kinds of three-phase relations (i.e. L12–D024–D022 and D024–rhombohedral–D022) were found to exist. Also, D024 (Ni3Ti) phase extended up to concentration field in which a majority of constituent Ti elements were replaced by Al and V elements, keeping their concentrations identical. The prepared Alloys exhibited widely different microstructures, depending on Alloy composition and temperature. In the low Ti concentration region, dual multi-phase microstructures composed of L12+D024+A1(→L12+D022) were formed by a eutectic reaction.
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phase relation and microstructure in ni3al ni3ti ni3nb pseudo ternary Alloy System
Intermetallics, 2002Co-Authors: K Tomihisa, Yasuyuki Kaneno, Takayuki TakasugiAbstract:Abstract The phase relation and microstructure of Alloys based on the Ni 3 Al–Ni 3 Ti–Ni 3 Nb pseudo-ternary Alloy System at 1273 K were investigated by an optical microscope, an X-ray diffraction and a scanning electron microscope (attached with a wavelength dispersive spectroscope). As the constituent intermetallic phases, L1 2 (Ni 3 Al), D0 24 (Ni 3 Ti), D0 a (Ni 3 Nb) and D0 19 (Ni 3 Ti 0.7 Nb 0.3 ) were identified and then their phase fields were shown to depend upon the electron concentration ( e/a ) and the atomic size factor ( R x / R Ni ) of constituent atoms. Among four intermetallic phases identified, five kinds of two-phase relations (i.e. L1 2 –D0 24 , D0 24 –D0 19 , D0 19 –D0 a , D0 a –L1 2 and D0 24 –D0 a ) and two kinds of three-phase relations (i.e. L1 2 –D0 24 –D0 a and D0 24 –D0 19 –D0 a ) were found to exist. Also, D0 24 (Ni 3 Ti) phase extended up to concentration field in which a majority of constituent Ti elements were replaced by Al and Nb elements, keeping their concentration ratios identical. The prepared Alloys exhibited widely different microstructures, depending on whether their Alloy compositions exist in a single phase, a two-phase or a three-phase region, and also on what kind of intermetallic phases their Alloy compositions are composed of.
Thomas Kuech - One of the best experts on this subject based on the ideXlab platform.
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gaas1 y zpybiz an alternative reduced band gap Alloy System lattice matched to gaas
Applied Physics Letters, 2014Co-Authors: Kamran Forghani, Yingxin Guan, Dane Morgan, S E Babcock, Luke J. Mawst, Maria Losurdo, April S. Brown, Thomas KuechAbstract:The growth and properties of Alloys in the alternative quaternary Alloy System GaAs1−y−zPyBiz were explored. This materials System allows simultaneous and independent tuning of lattice constant and band gap energy, Eg, over a wide range for potential near- and mid-infrared optoelectronic applications by adjusting y and z in GaAs1−y−zPyBiz. Highly tensile-strained, pseudomorphic films of GaAs1−yPy with a lattice mismatch strain of ∼1.2% served as the host for the subsequent addition of Bi. Lattice-matched Alloy materials to GaAs were generated by holding y ∼ 3.3z in GaAs1−y−zPyBiz. Epitaxial films with both high Bi content, z ∼ 0.0854, and a smooth morphology were realized with measured band gap energies as low as 1.11–1.01 eV, lattice-matched to GaAs substrates. Density functional theory calculations are used to provide a predictive model for the band gap of GaAs1−y−zPyBiz lattice-matched to GaAs.
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gaas1 y zpybiz an alternative reduced band gap Alloy System lattice matched to gaas
Applied Physics Letters, 2014Co-Authors: Kamran Forghani, Yingxin Guan, Dane Morgan, S E Babcock, Luke J. Mawst, Maria Losurdo, April S. Brown, Thomas KuechAbstract:The growth and properties of Alloys in the alternative quaternary Alloy System GaAs1−y−zPyBiz were explored. This materials System allows simultaneous and independent tuning of lattice constant and band gap energy, Eg, over a wide range for potential near- and mid-infrared optoelectronic applications by adjusting y and z in GaAs1−y−zPyBiz. Highly tensile-strained, pseudomorphic films of GaAs1−yPy with a lattice mismatch strain of ∼1.2% served as the host for the subsequent addition of Bi. Lattice-matched Alloy materials to GaAs were generated by holding y ∼ 3.3z in GaAs1−y−zPyBiz. Epitaxial films with both high Bi content, z ∼ 0.0854, and a smooth morphology were realized with measured band gap energies as low as 1.11–1.01 eV, lattice-matched to GaAs substrates. Density functional theory calculations are used to provide a predictive model for the band gap of GaAs1−y−zPyBiz lattice-matched to GaAs.
Yasuyuki Kaneno - One of the best experts on this subject based on the ideXlab platform.
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further investigation on phase relation and microstructures in ni3si ni3ti ni3nb pseudo ternary Alloy System
Intermetallics, 2006Co-Authors: K Ohira, Yasuyuki Kaneno, Hiroshi Tsuda, Takayuki TakasugiAbstract:Abstract The isothermal phase diagram at 1323 K in the Ni3Si–Ni3Ti–Ni3Nb pseudo-ternary Alloy System was re-investigated by scanning electron microscopy (attached with a wavelength dispersive spectroscope), X-ray diffraction and transmission electron microscopy (TEM), focusing on the phase relation among possible geometrically-close-packed (GCP) Ni3X phases. The prepared Alloys exhibited widely different microstructures, depending on Alloy compositions whether they exist in a single phase, a two- or a three-phase region, and also on the constituent GCP Ni3X phases. The L12(Ni3Si), D024(Ni3Ti) and D0a(Ni3Nb) phases were directly equilibrated one another or each other when keeping Ni content 79.5 at.%. On the other hand, the D019(Ni3Ti0.7Nb0.3) phase was identified to exist when keeping Ni content 75 at.%. The phase stability and existing region of each GCP Ni3X phase identified in the Ni3Si–Ni3Ti–Ni3Nb pseudo-ternary Alloy System were discussed, based on the electron concentration (e/a) and the atomic size factor (Rx/RNi) of the constituent atoms.
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phase relation and microstructure in multi phase intermetallic Alloys based on ni3si ni3ti ni3nb pseudo ternary Alloy System
Intermetallics, 2004Co-Authors: Y Nunomura, Yasuyuki Kaneno, Hiroshi Tsuda, Takayuki TakasugiAbstract:Abstract The phase relation and microstructure of Alloys based on the Ni3Al–Ni3Ti–Ni3V pseudo-ternary Alloy System at 1273 and 1373 K were investigated by optical microscopy, X-ray diffraction, differential scanning calorimetry and scanning electron microscopy (attached with a wavelength dispersive spectroscope). As the constituent intermetallic phases at 1273 K, L12(Ni3Al), D024(Ni3Ti), D022(Ni3V) and rhombohedral (Ni3Ti0.7V0.3) were identified and then their phase fields were shown to depend upon the electron concentration (e/a) and the atomic size factor (Rx/RNi) of the constituent atoms. Among four intermetallic phases identified at 1273 K, five kinds of two-phase relations (i.e. L12–D024, D024–rhombohedral, rhombohedral–D022 D022–D024 and D022–L12) and two kinds of three-phase relations (i.e. L12–D024–D022 and D024–rhombohedral–D022) were found to exist. Also, D024 (Ni3Ti) phase extended up to concentration field in which a majority of constituent Ti elements were replaced by Al and V elements, keeping their concentrations identical. The prepared Alloys exhibited widely different microstructures, depending on Alloy composition and temperature. In the low Ti concentration region, dual multi-phase microstructures composed of L12+D024+A1(→L12+D022) were formed by a eutectic reaction.
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phase relation and microstructure in multi phase intermetallic Alloys based on ni3al ni3nb ni3v pseudo ternary Alloy System
Intermetallics, 2004Co-Authors: Y Nunomura, Yasuyuki Kaneno, Hiroshi Tsuda, Takayuki TakasugiAbstract:Abstract The phase relation and microstructure of Alloys based on the Ni3Al–Ni3Ti–Ni3V pseudo-ternary Alloy System at 1273 and 1373 K were investigated by optical microscopy, X-ray diffraction, differential scanning calorimetry and scanning electron microscopy (attached with a wavelength dispersive spectroscope). As the constituent intermetallic phases at 1273 K, L12(Ni3Al), D024(Ni3Ti), D022(Ni3V) and rhombohedral (Ni3Ti0.7V0.3) were identified and then their phase fields were shown to depend upon the electron concentration (e/a) and the atomic size factor (Rx/RNi) of the constituent atoms. Among four intermetallic phases identified at 1273 K, five kinds of two-phase relations (i.e. L12–D024, D024–rhombohedral, rhombohedral–D022 D022–D024 and D022–L12) and two kinds of three-phase relations (i.e. L12–D024–D022 and D024–rhombohedral–D022) were found to exist. Also, D024 (Ni3Ti) phase extended up to concentration field in which a majority of constituent Ti elements were replaced by Al and V elements, keeping their concentrations identical. The prepared Alloys exhibited widely different microstructures, depending on Alloy composition and temperature. In the low Ti concentration region, dual multi-phase microstructures composed of L12+D024+A1(→L12+D022) were formed by a eutectic reaction.
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phase relation and microstructure in ni3al ni3ti ni3nb pseudo ternary Alloy System
Intermetallics, 2002Co-Authors: K Tomihisa, Yasuyuki Kaneno, Takayuki TakasugiAbstract:Abstract The phase relation and microstructure of Alloys based on the Ni 3 Al–Ni 3 Ti–Ni 3 Nb pseudo-ternary Alloy System at 1273 K were investigated by an optical microscope, an X-ray diffraction and a scanning electron microscope (attached with a wavelength dispersive spectroscope). As the constituent intermetallic phases, L1 2 (Ni 3 Al), D0 24 (Ni 3 Ti), D0 a (Ni 3 Nb) and D0 19 (Ni 3 Ti 0.7 Nb 0.3 ) were identified and then their phase fields were shown to depend upon the electron concentration ( e/a ) and the atomic size factor ( R x / R Ni ) of constituent atoms. Among four intermetallic phases identified, five kinds of two-phase relations (i.e. L1 2 –D0 24 , D0 24 –D0 19 , D0 19 –D0 a , D0 a –L1 2 and D0 24 –D0 a ) and two kinds of three-phase relations (i.e. L1 2 –D0 24 –D0 a and D0 24 –D0 19 –D0 a ) were found to exist. Also, D0 24 (Ni 3 Ti) phase extended up to concentration field in which a majority of constituent Ti elements were replaced by Al and Nb elements, keeping their concentration ratios identical. The prepared Alloys exhibited widely different microstructures, depending on whether their Alloy compositions exist in a single phase, a two-phase or a three-phase region, and also on what kind of intermetallic phases their Alloy compositions are composed of.
Kamran Forghani - One of the best experts on this subject based on the ideXlab platform.
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gaas1 y zpybiz an alternative reduced band gap Alloy System lattice matched to gaas
Applied Physics Letters, 2014Co-Authors: Kamran Forghani, Yingxin Guan, Dane Morgan, S E Babcock, Luke J. Mawst, Maria Losurdo, April S. Brown, Thomas KuechAbstract:The growth and properties of Alloys in the alternative quaternary Alloy System GaAs1−y−zPyBiz were explored. This materials System allows simultaneous and independent tuning of lattice constant and band gap energy, Eg, over a wide range for potential near- and mid-infrared optoelectronic applications by adjusting y and z in GaAs1−y−zPyBiz. Highly tensile-strained, pseudomorphic films of GaAs1−yPy with a lattice mismatch strain of ∼1.2% served as the host for the subsequent addition of Bi. Lattice-matched Alloy materials to GaAs were generated by holding y ∼ 3.3z in GaAs1−y−zPyBiz. Epitaxial films with both high Bi content, z ∼ 0.0854, and a smooth morphology were realized with measured band gap energies as low as 1.11–1.01 eV, lattice-matched to GaAs substrates. Density functional theory calculations are used to provide a predictive model for the band gap of GaAs1−y−zPyBiz lattice-matched to GaAs.
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gaas1 y zpybiz an alternative reduced band gap Alloy System lattice matched to gaas
Applied Physics Letters, 2014Co-Authors: Kamran Forghani, Yingxin Guan, Dane Morgan, S E Babcock, Luke J. Mawst, Maria Losurdo, April S. Brown, Thomas KuechAbstract:The growth and properties of Alloys in the alternative quaternary Alloy System GaAs1−y−zPyBiz were explored. This materials System allows simultaneous and independent tuning of lattice constant and band gap energy, Eg, over a wide range for potential near- and mid-infrared optoelectronic applications by adjusting y and z in GaAs1−y−zPyBiz. Highly tensile-strained, pseudomorphic films of GaAs1−yPy with a lattice mismatch strain of ∼1.2% served as the host for the subsequent addition of Bi. Lattice-matched Alloy materials to GaAs were generated by holding y ∼ 3.3z in GaAs1−y−zPyBiz. Epitaxial films with both high Bi content, z ∼ 0.0854, and a smooth morphology were realized with measured band gap energies as low as 1.11–1.01 eV, lattice-matched to GaAs substrates. Density functional theory calculations are used to provide a predictive model for the band gap of GaAs1−y−zPyBiz lattice-matched to GaAs.
Hiroshi Tsuda - One of the best experts on this subject based on the ideXlab platform.
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further investigation on phase relation and microstructures in ni3si ni3ti ni3nb pseudo ternary Alloy System
Intermetallics, 2006Co-Authors: K Ohira, Yasuyuki Kaneno, Hiroshi Tsuda, Takayuki TakasugiAbstract:Abstract The isothermal phase diagram at 1323 K in the Ni3Si–Ni3Ti–Ni3Nb pseudo-ternary Alloy System was re-investigated by scanning electron microscopy (attached with a wavelength dispersive spectroscope), X-ray diffraction and transmission electron microscopy (TEM), focusing on the phase relation among possible geometrically-close-packed (GCP) Ni3X phases. The prepared Alloys exhibited widely different microstructures, depending on Alloy compositions whether they exist in a single phase, a two- or a three-phase region, and also on the constituent GCP Ni3X phases. The L12(Ni3Si), D024(Ni3Ti) and D0a(Ni3Nb) phases were directly equilibrated one another or each other when keeping Ni content 79.5 at.%. On the other hand, the D019(Ni3Ti0.7Nb0.3) phase was identified to exist when keeping Ni content 75 at.%. The phase stability and existing region of each GCP Ni3X phase identified in the Ni3Si–Ni3Ti–Ni3Nb pseudo-ternary Alloy System were discussed, based on the electron concentration (e/a) and the atomic size factor (Rx/RNi) of the constituent atoms.
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phase relation and microstructure in multi phase intermetallic Alloys based on ni3si ni3ti ni3nb pseudo ternary Alloy System
Intermetallics, 2004Co-Authors: Y Nunomura, Yasuyuki Kaneno, Hiroshi Tsuda, Takayuki TakasugiAbstract:Abstract The phase relation and microstructure of Alloys based on the Ni3Al–Ni3Ti–Ni3V pseudo-ternary Alloy System at 1273 and 1373 K were investigated by optical microscopy, X-ray diffraction, differential scanning calorimetry and scanning electron microscopy (attached with a wavelength dispersive spectroscope). As the constituent intermetallic phases at 1273 K, L12(Ni3Al), D024(Ni3Ti), D022(Ni3V) and rhombohedral (Ni3Ti0.7V0.3) were identified and then their phase fields were shown to depend upon the electron concentration (e/a) and the atomic size factor (Rx/RNi) of the constituent atoms. Among four intermetallic phases identified at 1273 K, five kinds of two-phase relations (i.e. L12–D024, D024–rhombohedral, rhombohedral–D022 D022–D024 and D022–L12) and two kinds of three-phase relations (i.e. L12–D024–D022 and D024–rhombohedral–D022) were found to exist. Also, D024 (Ni3Ti) phase extended up to concentration field in which a majority of constituent Ti elements were replaced by Al and V elements, keeping their concentrations identical. The prepared Alloys exhibited widely different microstructures, depending on Alloy composition and temperature. In the low Ti concentration region, dual multi-phase microstructures composed of L12+D024+A1(→L12+D022) were formed by a eutectic reaction.
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phase relation and microstructure in multi phase intermetallic Alloys based on ni3al ni3nb ni3v pseudo ternary Alloy System
Intermetallics, 2004Co-Authors: Y Nunomura, Yasuyuki Kaneno, Hiroshi Tsuda, Takayuki TakasugiAbstract:Abstract The phase relation and microstructure of Alloys based on the Ni3Al–Ni3Ti–Ni3V pseudo-ternary Alloy System at 1273 and 1373 K were investigated by optical microscopy, X-ray diffraction, differential scanning calorimetry and scanning electron microscopy (attached with a wavelength dispersive spectroscope). As the constituent intermetallic phases at 1273 K, L12(Ni3Al), D024(Ni3Ti), D022(Ni3V) and rhombohedral (Ni3Ti0.7V0.3) were identified and then their phase fields were shown to depend upon the electron concentration (e/a) and the atomic size factor (Rx/RNi) of the constituent atoms. Among four intermetallic phases identified at 1273 K, five kinds of two-phase relations (i.e. L12–D024, D024–rhombohedral, rhombohedral–D022 D022–D024 and D022–L12) and two kinds of three-phase relations (i.e. L12–D024–D022 and D024–rhombohedral–D022) were found to exist. Also, D024 (Ni3Ti) phase extended up to concentration field in which a majority of constituent Ti elements were replaced by Al and V elements, keeping their concentrations identical. The prepared Alloys exhibited widely different microstructures, depending on Alloy composition and temperature. In the low Ti concentration region, dual multi-phase microstructures composed of L12+D024+A1(→L12+D022) were formed by a eutectic reaction.
