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Yoshisato Kimura - One of the best experts on this subject based on the ideXlab platform.

  • extra ordering of carbon atoms and mechanical properties of e21 co3alc based Heat Resistant Alloys
    Intermetallics, 2006
    Co-Authors: Yoshisato Kimura, Kiichi Sakai, Fugao Wei, Yoshinao Mishima
    Abstract:

    Abstract Mechanical properties of E2 1 based Co 3 AlC single crystals and single-phase polycrystalline Co 3 AlC and Fe 3 AlC Alloys have been evaluated by compression tests performed in a wide temperature range from room temperature to 1373 K. Effect of the ordering of C on the phase stability and mechanical properties has been investigated and discussed with the anti-phase boundary (APB) formation. Temperature dependence of critical resolved shear stress (CRSS) has been determined to consider the compressive mechanical behavior of Co 3 AlC single crystal. Yield strength anomaly appears in Co 3 AlC single crystal as we have expected from the similarity between E2 1 ′ and L1 2 . Schmid law is only applicable in a high temperature range between 1173 and 1273 K. Crystallographic analysis and microstructure observation were conducted using transmission electron microscopy (TEM). It was found that disordering of C atoms could be induced by the irradiation damage of electron beam after high-resolution transmission electron microscopy (HRTEM) observation.

  • phase equilibria in the t al c t co ni rh ir and t al b t rh ir systems for the design of e21 co3alc based Heat Resistant Alloys
    Intermetallics, 2006
    Co-Authors: Yoshisato Kimura, Kaoru Iida, Fugao Wei, Yoshinao Mishima
    Abstract:

    Abstract Phase equilibria in Co–Al–C ternary and Co–Ni–Al–C quaternary systems were investigated to establish the basis for designing new class of α(Co) based Heat Resistant Alloys strengthened by the E2 1 type intermetallic compound Co 3 AlC. Phase stability of E2 1 (Co, Ni) 3 AlC was examined from the viewpoint of magnetic properties such as Curie temperature and saturation magnetization. The possibility of two-phase separation is indicated between E2 1 (E2 1 ′) (Co,Ni) 3 AlC and E2 1 (L1 2 ) (Ni,Co) 3 Al(C) in the Co–Ni–Al–C quaternary system, where we denote E2 1 ′ as standing for the ordered crystal structure of (Co,Ni) 3 AlC 0.5 formed by the extra ordering of carbon atoms. Phase diagrams information was determined by means of electron probe microanalysis and microstructural observation for the T–Al–C (T: Co, Ni, Rh, Ir) and T–Al–B (T: Rh, Ir) systems to examine the phase equilibria in each alloy system focusing on the existence of E2 1 T 3 AlC and T 3 AlB. The existence of E2 1 Ir 3 AlB (E2 1 ′ Ir 3 AlB 0.5 ) phase has been revealed in the Ir–Al–B system by diffraction analysis of transmission electron microscopy and electron probe microanalysis.

  • Revolutionary microstructure control with phase diagram evaluation for the design of E21 Co3AlC-based Heat-Resistant Alloys
    Journal of Phase Equilibria and Diffusion, 2006
    Co-Authors: Yoshisato Kimura, Kiichi Sakai, Yoshinao Mishima
    Abstract:

    E21 Co3AlC might be used as a strengthener to develop new Co-based Heat-Resistant Alloys. To establish the basis of microstructure control for further improving mechanical properties, phase equilibria in the CoAl-C ternary system were investigated and phase diagram information particularly related to E21 Co3AlC and liquid phase were evaluated and reconsidered. Single crystals of E21 Co3AlC have been grown successfully for the first time using optical floating zone (OFZ) melting. Extra ordering of carbon atoms taking place in E21 Co3AlC was confirmed using single crystals by transmission electron microscopy. As a result of this ordering, E21 ′ Co3AlC0.5 accompanies formation of antiphase boundaries. A wide variety of the two-phase Co3Alc/α(Co) microstructures were prepared by unidirectional solidification using OFZ.

  • Microstructure Control of Co3AlC-Base Heat Resistant Alloys Using Optical Floating Zone Melting
    Materials Science Forum, 2005
    Co-Authors: Yoshisato Kimura, Kiichi Sakai, Shinya Teramoto, Yoshinao Mishima
    Abstract:

    Aiming for further improvement of mechanical properties of Co3AlC-based Heat Resistant Alloys, microstructure control was conducted using optical floating zone (OFZ) melting. Unidirectional solidification was performed to align Co3AlC/a(Co) two-phase eutectic microstructure. Co3AlC single phase poly-crystal Alloys were successfully fabricated for the first time by taking advantage of OFZ. Mechanical properties were evaluated for selected Alloys by compression tests at ambient temperature, 1073 K and 1273 K. Excellent elevated temperature strength is achieved in Co3AlC single phase Alloys and ductility is sufficiently improved in Co3AlC/a(Co) two-phase Alloys.

Yoshinao Mishima - One of the best experts on this subject based on the ideXlab platform.

  • extra ordering of carbon atoms and mechanical properties of e21 co3alc based Heat Resistant Alloys
    Intermetallics, 2006
    Co-Authors: Yoshisato Kimura, Kiichi Sakai, Fugao Wei, Yoshinao Mishima
    Abstract:

    Abstract Mechanical properties of E2 1 based Co 3 AlC single crystals and single-phase polycrystalline Co 3 AlC and Fe 3 AlC Alloys have been evaluated by compression tests performed in a wide temperature range from room temperature to 1373 K. Effect of the ordering of C on the phase stability and mechanical properties has been investigated and discussed with the anti-phase boundary (APB) formation. Temperature dependence of critical resolved shear stress (CRSS) has been determined to consider the compressive mechanical behavior of Co 3 AlC single crystal. Yield strength anomaly appears in Co 3 AlC single crystal as we have expected from the similarity between E2 1 ′ and L1 2 . Schmid law is only applicable in a high temperature range between 1173 and 1273 K. Crystallographic analysis and microstructure observation were conducted using transmission electron microscopy (TEM). It was found that disordering of C atoms could be induced by the irradiation damage of electron beam after high-resolution transmission electron microscopy (HRTEM) observation.

  • phase equilibria in the t al c t co ni rh ir and t al b t rh ir systems for the design of e21 co3alc based Heat Resistant Alloys
    Intermetallics, 2006
    Co-Authors: Yoshisato Kimura, Kaoru Iida, Fugao Wei, Yoshinao Mishima
    Abstract:

    Abstract Phase equilibria in Co–Al–C ternary and Co–Ni–Al–C quaternary systems were investigated to establish the basis for designing new class of α(Co) based Heat Resistant Alloys strengthened by the E2 1 type intermetallic compound Co 3 AlC. Phase stability of E2 1 (Co, Ni) 3 AlC was examined from the viewpoint of magnetic properties such as Curie temperature and saturation magnetization. The possibility of two-phase separation is indicated between E2 1 (E2 1 ′) (Co,Ni) 3 AlC and E2 1 (L1 2 ) (Ni,Co) 3 Al(C) in the Co–Ni–Al–C quaternary system, where we denote E2 1 ′ as standing for the ordered crystal structure of (Co,Ni) 3 AlC 0.5 formed by the extra ordering of carbon atoms. Phase diagrams information was determined by means of electron probe microanalysis and microstructural observation for the T–Al–C (T: Co, Ni, Rh, Ir) and T–Al–B (T: Rh, Ir) systems to examine the phase equilibria in each alloy system focusing on the existence of E2 1 T 3 AlC and T 3 AlB. The existence of E2 1 Ir 3 AlB (E2 1 ′ Ir 3 AlB 0.5 ) phase has been revealed in the Ir–Al–B system by diffraction analysis of transmission electron microscopy and electron probe microanalysis.

  • Revolutionary microstructure control with phase diagram evaluation for the design of E21 Co3AlC-based Heat-Resistant Alloys
    Journal of Phase Equilibria and Diffusion, 2006
    Co-Authors: Yoshisato Kimura, Kiichi Sakai, Yoshinao Mishima
    Abstract:

    E21 Co3AlC might be used as a strengthener to develop new Co-based Heat-Resistant Alloys. To establish the basis of microstructure control for further improving mechanical properties, phase equilibria in the CoAl-C ternary system were investigated and phase diagram information particularly related to E21 Co3AlC and liquid phase were evaluated and reconsidered. Single crystals of E21 Co3AlC have been grown successfully for the first time using optical floating zone (OFZ) melting. Extra ordering of carbon atoms taking place in E21 Co3AlC was confirmed using single crystals by transmission electron microscopy. As a result of this ordering, E21 ′ Co3AlC0.5 accompanies formation of antiphase boundaries. A wide variety of the two-phase Co3Alc/α(Co) microstructures were prepared by unidirectional solidification using OFZ.

  • Microstructure Control of Co3AlC-Base Heat Resistant Alloys Using Optical Floating Zone Melting
    Materials Science Forum, 2005
    Co-Authors: Yoshisato Kimura, Kiichi Sakai, Shinya Teramoto, Yoshinao Mishima
    Abstract:

    Aiming for further improvement of mechanical properties of Co3AlC-based Heat Resistant Alloys, microstructure control was conducted using optical floating zone (OFZ) melting. Unidirectional solidification was performed to align Co3AlC/a(Co) two-phase eutectic microstructure. Co3AlC single phase poly-crystal Alloys were successfully fabricated for the first time by taking advantage of OFZ. Mechanical properties were evaluated for selected Alloys by compression tests at ambient temperature, 1073 K and 1273 K. Excellent elevated temperature strength is achieved in Co3AlC single phase Alloys and ductility is sufficiently improved in Co3AlC/a(Co) two-phase Alloys.

J Porcayocalderon - One of the best experts on this subject based on the ideXlab platform.

  • corrosion performance of Heat Resistant Alloys in na2so4 v2o5 molten salts
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2006
    Co-Authors: J G Gonzalezrodriguez, Sergio Haro, A Martinezvillafane, V M Salinasbravo, J Porcayocalderon
    Abstract:

    Abstract The corrosion Resistant of three Heat Resistant Alloys in molten vanadium pentoxide (V 2 O 5 ), sodium sulfate (Na 2 SO 4 ) and 80(mol%) V 2 O 5 –20Na 2 SO 4 has been evaluated using the weight loss technique. Materials included Fe–25Cr–35Ni–0.45C, Fe–35Cr–45Ni with 0.12 and 0.45C Alloys. Temperatures included 600, 700 and 800 °C for V 2 O 5 and the 80V 2 O 5 –20Na 2 SO 4 mixture, and 800, 900 and 1000 °C for Na 2 SO 4 . The tests were supplemented by detailed electronic microscopy and microanalysis studies. In all cases, the least Resistant alloy was the Fe-25Cr–35Ni–0.45C one whereas the most Resistant was the Fe–35Cr–45Ni–0.12C one. The results are discussed in terms of the acidic dissolution of the external protective Cr 2 O 3 , Al 2 O 3 and SiO 2 layers, by the salts and internal sulfidation.

J G Gonzalezrodriguez - One of the best experts on this subject based on the ideXlab platform.

  • corrosion performance of Heat Resistant Alloys in na2so4 v2o5 molten salts
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2006
    Co-Authors: J G Gonzalezrodriguez, Sergio Haro, A Martinezvillafane, V M Salinasbravo, J Porcayocalderon
    Abstract:

    Abstract The corrosion Resistant of three Heat Resistant Alloys in molten vanadium pentoxide (V 2 O 5 ), sodium sulfate (Na 2 SO 4 ) and 80(mol%) V 2 O 5 –20Na 2 SO 4 has been evaluated using the weight loss technique. Materials included Fe–25Cr–35Ni–0.45C, Fe–35Cr–45Ni with 0.12 and 0.45C Alloys. Temperatures included 600, 700 and 800 °C for V 2 O 5 and the 80V 2 O 5 –20Na 2 SO 4 mixture, and 800, 900 and 1000 °C for Na 2 SO 4 . The tests were supplemented by detailed electronic microscopy and microanalysis studies. In all cases, the least Resistant alloy was the Fe-25Cr–35Ni–0.45C one whereas the most Resistant was the Fe–35Cr–45Ni–0.12C one. The results are discussed in terms of the acidic dissolution of the external protective Cr 2 O 3 , Al 2 O 3 and SiO 2 layers, by the salts and internal sulfidation.

Fugao Wei - One of the best experts on this subject based on the ideXlab platform.

  • extra ordering of carbon atoms and mechanical properties of e21 co3alc based Heat Resistant Alloys
    Intermetallics, 2006
    Co-Authors: Yoshisato Kimura, Kiichi Sakai, Fugao Wei, Yoshinao Mishima
    Abstract:

    Abstract Mechanical properties of E2 1 based Co 3 AlC single crystals and single-phase polycrystalline Co 3 AlC and Fe 3 AlC Alloys have been evaluated by compression tests performed in a wide temperature range from room temperature to 1373 K. Effect of the ordering of C on the phase stability and mechanical properties has been investigated and discussed with the anti-phase boundary (APB) formation. Temperature dependence of critical resolved shear stress (CRSS) has been determined to consider the compressive mechanical behavior of Co 3 AlC single crystal. Yield strength anomaly appears in Co 3 AlC single crystal as we have expected from the similarity between E2 1 ′ and L1 2 . Schmid law is only applicable in a high temperature range between 1173 and 1273 K. Crystallographic analysis and microstructure observation were conducted using transmission electron microscopy (TEM). It was found that disordering of C atoms could be induced by the irradiation damage of electron beam after high-resolution transmission electron microscopy (HRTEM) observation.

  • phase equilibria in the t al c t co ni rh ir and t al b t rh ir systems for the design of e21 co3alc based Heat Resistant Alloys
    Intermetallics, 2006
    Co-Authors: Yoshisato Kimura, Kaoru Iida, Fugao Wei, Yoshinao Mishima
    Abstract:

    Abstract Phase equilibria in Co–Al–C ternary and Co–Ni–Al–C quaternary systems were investigated to establish the basis for designing new class of α(Co) based Heat Resistant Alloys strengthened by the E2 1 type intermetallic compound Co 3 AlC. Phase stability of E2 1 (Co, Ni) 3 AlC was examined from the viewpoint of magnetic properties such as Curie temperature and saturation magnetization. The possibility of two-phase separation is indicated between E2 1 (E2 1 ′) (Co,Ni) 3 AlC and E2 1 (L1 2 ) (Ni,Co) 3 Al(C) in the Co–Ni–Al–C quaternary system, where we denote E2 1 ′ as standing for the ordered crystal structure of (Co,Ni) 3 AlC 0.5 formed by the extra ordering of carbon atoms. Phase diagrams information was determined by means of electron probe microanalysis and microstructural observation for the T–Al–C (T: Co, Ni, Rh, Ir) and T–Al–B (T: Rh, Ir) systems to examine the phase equilibria in each alloy system focusing on the existence of E2 1 T 3 AlC and T 3 AlB. The existence of E2 1 Ir 3 AlB (E2 1 ′ Ir 3 AlB 0.5 ) phase has been revealed in the Ir–Al–B system by diffraction analysis of transmission electron microscopy and electron probe microanalysis.