Cooperative shear model for the rheology of glass-forming metallic liquids

A rheological law based on the concept of cooperatively sheared flow zones is presented, in which the effective thermodynamic state variable controlling flow is identified to be the isoconfigurational shear modulus of the liquid. The law captures Newtonian as well as non-Newtonian viscosity data for...

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Bibliographic Details
Published in:Physical review letters 2006-08, Vol.97 (6), p.065502-065502, Article 065502
Main Authors: Demetriou, Marios D, Harmon, John S, Tao, Min, Duan, Gang, Samwer, Konrad, Johnson, William L
Format: Article
Language:English
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Summary:A rheological law based on the concept of cooperatively sheared flow zones is presented, in which the effective thermodynamic state variable controlling flow is identified to be the isoconfigurational shear modulus of the liquid. The law captures Newtonian as well as non-Newtonian viscosity data for glass-forming metallic liquids over a broad range of fragility. Acoustic measurements on specimens deformed at a constant strain rate correlate well with the measured steady-state viscosities, hence verifying that viscosity has a unique functional relationship with the isoconfigurational shear modulus.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.97.065502