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

Heat of evolution and non-Newtonian viscous flow of Pd₄₀Ni₄₀P₂₀ glassy alloy

Nobuyuki Nishiyama, Hidemi Kato, Junji Saida, Akihisa Inoue, Ho Sou Chen

Materials Development Division

Research output: Contribution to journal › Article › peer-review

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.

Original language	English
Pages (from-to)	741-745
Number of pages	5
Journal	Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume	41
Issue number	2 A
DOIs	https://doi.org/10.1143/jjap.41.741
Publication status	Published - 2002 Feb

Keywords

Glassy alloy
Grass transition
Non-Newtonian flow
Stress-induced structure change

ASJC Scopus subject areas

Engineering(all)
Physics and Astronomy(all)

Access to Document

10.1143/jjap.41.741

Cite this

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title = "Heat of evolution and non-Newtonian viscous flow of Pd40Ni40P20 glassy alloy",

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, Tg, 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 (= Tg - 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.",

keywords = "Glassy alloy, Grass transition, Non-Newtonian flow, Stress-induced structure change",

author = "Nobuyuki Nishiyama and Hidemi Kato and Junji Saida and Akihisa Inoue and Chen, {Ho Sou}",

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T1 - Heat of evolution and non-Newtonian viscous flow of Pd40Ni40P20 glassy alloy

AU - Nishiyama, Nobuyuki

AU - Kato, Hidemi

AU - Saida, Junji

AU - Inoue, Akihisa

AU - Chen, Ho Sou

PY - 2002/2

Y1 - 2002/2

N2 - The evolution of specific heat of a Pd40Ni40P20 glassy alloy subjected to different degrees of non-Newtonian flow condition near the glass transition temperature, Tg, 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 (= Tg - 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.

AB - The evolution of specific heat of a Pd40Ni40P20 glassy alloy subjected to different degrees of non-Newtonian flow condition near the glass transition temperature, Tg, 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 (= Tg - 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.

KW - Glassy alloy

KW - Grass transition

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KW - Stress-induced structure change

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