期刊
JOURNAL OF APPLIED PHYSICS
卷 109, 期 5, 页码 -出版社
AIP Publishing
DOI: 10.1063/1.3552300
关键词
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资金
- US National Science Foundation (NSF) [DMR-0605911]
Quasistatic measurements of room-temperature anelastic relaxation were used to characterize the properties of shear transformation zones (STZs) in amorphous Al86.8Ni3.7Y9.5 in the dilute limit. Using a combination of nanoindenter cantilever bending and mandrel bend relaxation techniques, anelastic relaxation was measured over times ranging from 1 s to 3 x 10(7) s. Direct spectrum analysis yields relaxation-time spectra, which display seven distinct peaks. The results were analyzed using a linear dashpot-and-spring model, combined with transition-state theory, to yield several STZ properties. These reveal a quantized hierarchy of STZs that differ from each other by one atomic volume. Potential STZs occupy a large volume fraction of the solid. They access their ergodic space, with the ratio of forward-to backward jump rates ranging from 1.03 to 4.3 for the range of stress values used. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3552300]
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