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Cooperative Shear Model for the Rheology of Glass-Forming Metallic Liquids

Demetriou, Marios D. and Harmon, John S. and Tao, Min and Duan, Gang and Samwer, Konrad and Johnson, William L. (2006) Cooperative Shear Model for the Rheology of Glass-Forming Metallic Liquids. Physical Review Letters, 97 (6). Art. No. 065502. ISSN 0031-9007. doi:10.1103/PhysRevLett.97.065502.

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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.

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Additional Information:©2006 The American Physical Society. (Received 16 March 2006; published 11 August 2006; corrected 14 August 2006) This work was supported by the MRSEC Program of the National Science Foundation under Grant No. DMR-0520565. The authors are grateful to G. Ravichandran for providing the Instron apparatus and to M. L. Lind for providing the pulse-echo overlap setup.
Errata:Cooperative Shear Model for the Rheology of Glass-Forming Metallic Liquids [Phys. Rev. Lett. 97, 065502 (2006)] Marios D. Demetriou et al. Phys. Rev. Lett. 97, 089901 (E) (2006)
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ID Code:5502
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Deposited On:20 Oct 2006
Last Modified:08 Nov 2021 20:26

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