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Volume and enthalpy relaxation in Zr55Cu30Ni5Al10 bulk metallic glass / O. Haruyama in Acta materialia, Vol. 58 N° 5 (Mars 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 5 (Mars 2010) . - pp. 1829–1836 Titre : Volume and enthalpy relaxation in Zr55Cu30Ni5Al10 bulk metallic glass Type de document : texte imprimé Auteurs : O. Haruyama, Auteur ; Y. Nakayama, Auteur ; R. Wada, Auteur Année de publication : 2011 Article en page(s) : pp. 1829–1836 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Bulk  metallic  glass  Zr55Cu30Ni5Al10  Volume  relaxation  Enthalpy  relaxation  Two-component  model Résumé : The structural relaxation in a Zr55Cu30Ni5Al10 bulk metallic glass was investigated by volume and enthalpy relaxation at various temperatures. The relaxation kinetics was well described by a stretched exponential relaxation function, Φ(t)=exp[-(t/τ)β]. The Kohlrausch index, β, ranged from 0.35 to 0.69, while the temperature dependence of relaxation time, τ was best fitted by the Vogel–Fulcher–Tanmmann formula, τ(T)=τ0exp[D∗T0/(T-T0)], with τ0 = 1.1 × 10−14 s, D∗ = 44.2 and T0 = 311 K. Atomic volumes in the equilibrium liquid region were measured by the electrostatic levitation method and these volumes, together with volumes of relaxed glasses, were better described by the Cohen–Grest model than by the Cohen–Turnbull model. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409008040 [article] Volume and enthalpy relaxation in Zr55Cu30Ni5Al10 bulk metallic glass [texte imprimé] / O. Haruyama, Auteur ; Y. Nakayama, Auteur ; R. Wada, Auteur . - 2011 . - pp. 1829–1836. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 5 (Mars 2010) . - pp. 1829–1836 Mots-clés : Bulk  metallic  glass  Zr55Cu30Ni5Al10  Volume  relaxation  Enthalpy  relaxation  Two-component  model Résumé : The structural relaxation in a Zr55Cu30Ni5Al10 bulk metallic glass was investigated by volume and enthalpy relaxation at various temperatures. The relaxation kinetics was well described by a stretched exponential relaxation function, Φ(t)=exp[-(t/τ)β]. The Kohlrausch index, β, ranged from 0.35 to 0.69, while the temperature dependence of relaxation time, τ was best fitted by the Vogel–Fulcher–Tanmmann formula, τ(T)=τ0exp[D∗T0/(T-T0)], with τ0 = 1.1 × 10−14 s, D∗ = 44.2 and T0 = 311 K. Atomic volumes in the equilibrium liquid region were measured by the electrostatic levitation method and these volumes, together with volumes of relaxed glasses, were better described by the Cohen–Grest model than by the Cohen–Turnbull model. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409008040