An atomically quantized hierarchy of shear transformation zones in a metallic glass
- Creators
- Ju, J. D.
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Jang, D.
- Nwankpa, A.
- Atzmon, M.
Abstract
Quasistatic measurements of room-temperature anelastic relaxation were used to characterize the properties of shear transformation zones (STZs) in amorphous Al_(86.8)Ni_(3.7)Y_(9.5) 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 × 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.
Additional Information
© 2011 American Institute of Physics. Received 1 September 2010; accepted 24 December 2010; published online 15 March 2011. This work was funded by the US National Science Foundation (NSF), Grant No.DMR-0605911. The authors are grateful to Professor F. Spaepen for useful discussions and reading of this manuscript, and T. Egami for useful discussions. They also thank Dr. F. Pinkerton of General Motors R&D Center for preparing the sample used in this work, and Professor J. Greer for the use of the nanoindenter in her laboratory.Attached Files
Published - Ju2011p13299J_Appl_Phys.pdf
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Additional details
- Eprint ID
- 23225
- Resolver ID
- CaltechAUTHORS:20110404-100257676
- DMR-0605911
- NSF
- Created
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2011-04-10Created from EPrint's datestamp field
- Updated
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2021-11-09Created from EPrint's last_modified field