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Your search keyword '"Choo, H"' showing total 16 results
Start Over Author "Choo, H" Journal applied physics letters
16 results on '"Choo, H"'

9. Structural model for bulk amorphous alloys

Author

Fan, Cang, primary, Liaw, P. K., additional, Wilson, T. W., additional, Dmowski, W., additional, Choo, H., additional, Liu, C. T., additional, Richardson, J. W., additional, and Proffen, Th., additional

Published
2006
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14. Thermophysical and elastic properties of Cu50Zr50 and (Cu50Zr50)95Al5 bulk-metallic-glass-forming alloys.

Author

Fan, G. J., Freels, M., Choo, H., Liaw, P. K., Li, J. J. Z., Rhim, Won-Kyu, Johnson, W. L., Yu, P., and Wang, W. H.

Subjects
METALLIC glasses, LEVITATION, SPECIFIC heat, VISCOSITY, THERMOPHYSICAL properties, COPPER compounds, EMISSIVITY
Abstract

By employing a containerless high-temperature high-vacuum electrostatic levitation technique, the thermophysical properties, including the ratio between the specific heat capacity and the hemispherical total emissivity, the specific volume, and the viscosity, of Cu50Zr50 and (Cu50Zr50)95Al5 bulk-metallic-glass (BMG)-forming liquids have been measured. Compared with Cu50Zr50, the improved glass-forming ability of (Cu50Zr50)95Al5 can be attributed to its dense liquid structure and its high value of viscosity. Additionally, the relationship between the viscosity of various BMG forming liquids at the melting temperature and the elastic properties of the corresponding glasses at room temperature will be compared. [ABSTRACT FROM AUTHOR]

Published
2006
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15. Embrittlement in a bulk nanocrystalline alloy induced by room-temperature aging.

Author

Fan, G. J., Choo, H., and Liaw, P. K.

Subjects
*NICKEL alloys, *NANOCRYSTALS, *EMBRITTLEMENT, *CRYSTAL grain boundaries, *ALLOY plating
Abstract

The effect of room-temperature aging on the mechanical behaviors of an electrodeposited bulk nanocrystalline (nc) Ni–Fe alloy has been investigated. The tensile elongation to failure, [variant_greek_epsilon]f, of the bulk nc Ni–Fe alloy decreased from approximately 7.2% in the as-deposited state to 5.0%, after aging at room temperature for one year. Moreover, the fatigue-endurance limit decreased from about 260 to 190 MPa. This aging-induced embrittlement may be mainly due to the enhanced atomic diffusivity in the nc materials, leading to the segregation of the impurity atoms at the grain boundaries. [ABSTRACT FROM AUTHOR]

Published
2006
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16. Thermophysical properties of a Cu46Zr42Al7Y5 bulk metallic glass-forming liquid.

Author

Fan, G. J., Li, J. J. Z., Rhim, Won-Kyu, Qiao, D. C., Choo, H., Liaw, P. K., and Johnson, W. L.

Subjects
METALLIC glasses, ELECTROSTATICS, THERMOPHYSICAL properties, VISCOSITY, SURFACE tension, AMORPHOUS substances, LIQUID metals
Abstract

The thermophysical properties, including the specific volume V, the surface tension σ, and the viscosity η, of a Cu46Zr42Al7Y5 bulk metallic glass in the molten state were investigated using a containerless high-temperature high-vacuum electrostatic levitation technique. The viscosity measurements indicate that the Cu46Zr42Al7Y5 alloy exhibits an intermediate fragility with the fragility index m=49. [ABSTRACT FROM AUTHOR]

Published
2006
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