Creation and annihilation of free volume during homogeneous flow of a metallic glass

 
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Heggen, Marc
Spaepen, Frans
Feuerbacher, Michael
Published Version
https://doi.org/10.1063/1.1827344
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Heggen, Marc, Frans Spaepen, and Michael Feuerbacher. 2005. “Creation and Annihilation of Free Volume during Homogeneous Flow of a Metallic Glass.” Journal of Applied Physics97 (3): 033506. https://doi.org/10.1063/1.1827344.
Abstract
Bulk samples of Pd41Ni10Cu29P20 glass were tested at constant true stress (20-636 MPa) in compression at 550, 555, and 565 K to study the transition from steady-state creep at low stress to deformation-induced softening at high stress. In the high-stress regime strongly accelerating creep was observed. All deformation was homogeneous. The activation volume was 106 Angstrom(3). The isoconfigurational activation energy was 9.03+/-0.64 eV. The disordering rate is proportional to the applied power density (stressxstrain rate). The disordering process is inefficient in energy and in the production of free volume.
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