Heat of Evolution and Non-Newtonian Viscous Flow of Pd40Ni40P20 Glassy Alloy

Nobuyuki Nishiyama; Hidemi Kato; Junji Saida; Akihisa Inoue; Ho-Sou Chen

doi:10.1143/JJAP.41.741

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Heat of Evolution and Non-Newtonian Viscous Flow of Pd₄₀Ni₄₀P₂₀ Glassy Alloy

Nobuyuki Nishiyama¹, Hidemi Kato², Junji Saida¹, Akihisa Inoue² and Ho-Sou Chen^3,4

Copyright (c) 2002 The Japan Society of Applied Physics
Japanese Journal of Applied Physics, Volume 41, Part 1, Number 2A

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Author affiliations

¹ Inoue Supercooled Glass Project, ERATO, Japan Science and Technology Corporation (JST), Sendai 982-0807, Japan

² Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan

³ Bell Laboratories, Lucent Technology, Murray Hill, New Jersey 07974, USA

⁴ Graduate School of Materials Science, Chinese Culture University, Yangmingsan, Taipei, Taiwan, Republic of China

Dates

Received 12 September 2001
Accepted 27 November 2001

Citation

Nobuyuki Nishiyama et al 2002 Jpn. J. Appl. Phys. 41 741

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DOI

https://doi.org/10.1143/JJAP.41.741

PACS

81.05.Bx, 64.70.pe, 65.40.Ba, 47.50.-d

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Abstract

The evolution of specific heat of a Pd₄₀Ni₄₀P₂₀ glassy alloy subjected to different degrees of non-Newtonian flow condition near the glass transition temperature, T_g, was investigated by a differential scanning calorimetry (DSC) method. Three exothermic relaxation spectrums were observed in temperature dependence of the specific heat. One of the relaxations in T>490 K (=T_g-95 K) strongly depended on the flow condition, on the other hand, the others did weakly. This relaxation has previously been reported and is due to the long-range disordering between metal and metalloid constituents. Thus, appearance of the non-Newtonian viscous flow in this glassy alloy is associated with the disordering of the glass skeleton framed with Pd–P and Ni–P coupling by the strong shear action.

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