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Experimental studies of elasticity, plastic flow, and anelasticity in metallic glass forming liquids

Citation

Harmon, John Shelby (2007) Experimental studies of elasticity, plastic flow, and anelasticity in metallic glass forming liquids. Dissertation (Ph.D.), California Institute of Technology. http://resolver.caltech.edu/CaltechETD:etd-05072007-150354

Abstract

A rheological law based on the concept of cooperatively-sheared flow zones is presented, in which the 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 constant strain rates correlate with the measured steady-state viscosities, and define the relative effects of the “elastic” and “cooperative volume” indices on the liquid fragility. The steady state deformation material properties are evaluated to obtain a relationship between the shear modulus and configurational enthalpy. Furthermore, the material properties are evaluated through steady state in an effort to probe the relaxation mechanisms governing flow.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:Amorphous metal; Anelastic; Compression test; Elastic properties; Energy storage; Enthalpy; Liquid fragility; Non-Newtonian flow; Relaxation; Shear transformation zone; Ultrasonic measurement; Viscosity
Degree Grantor:California Institute of Technology
Division:Engineering and Applied Science
Major Option:Materials Science
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Johnson, William Lewis
Thesis Committee:
  • Johnson, William Lewis (chair)
  • Fultz, Brent T.
  • Ravichandran, Guruswami
  • Bhattacharya, Kaushik
  • Goddard, William A., III
Defense Date:4 May 2007
Author Email:harmonjs (AT) caltech.edu
Record Number:CaltechETD:etd-05072007-150354
Persistent URL:http://resolver.caltech.edu/CaltechETD:etd-05072007-150354
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:1661
Collection:CaltechTHESIS
Deposited By: Imported from ETD-db
Deposited On:16 May 2007
Last Modified:26 Dec 2012 02:40

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