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An atomically quantized hierarchy of shear transformation zones in a metallic glass

Ju, J. D. and Jang, D. and Nwankpa, A. and Atzmon, M. (2011) An atomically quantized hierarchy of shear transformation zones in a metallic glass. Journal of Applied Physics, 109 (5). Art. No. 053522. ISSN 0021-8979. http://resolver.caltech.edu/CaltechAUTHORS:20110404-100257676

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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.


Item Type:Article
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http://dx.doi.org/10.1063/1.3552300DOIUNSPECIFIED
http://jap.aip.org/resource/1/japiau/v109/i5/p053522_s1PublisherUNSPECIFIED
http://link.aip.org/link/doi/10.1063/1.3552300PublisherUNSPECIFIED
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.
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Funding AgencyGrant Number
NSFDMR-0605911
Subject Keywords:aluminium alloys, anelastic relaxation, bending, cantilevers, metallic glasses, nanoindentation, nickel alloys, shear deformation, yttrium alloys
Classification Code:PACS: 81.40.Lm; 81.40.Jj; 81.40.Np; 62.40.+i; 62.20.F-
Record Number:CaltechAUTHORS:20110404-100257676
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20110404-100257676
Official Citation:An atomically quantized hierarchy of shear transformation zones in a metallic glass J. D. Ju, D. Jang, A. Nwankpa, and M. Atzmon J. Appl. Phys. 109, 053522 (2011); doi:10.1063/1.3552300 (8 pages) Online Publication Date: 15 March 2011 An atomically quantized hierarchy of shear transformation zones in a metallic glass J. D. Ju, D. Jang, A. Nwankpa, and M. Atzmon J. Appl. Phys. 109, 053522 (2011); doi:10.1063/1.3552300 (8 pages) Online Publication Date: 15 March 2011
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:23225
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:10 Apr 2011 02:29
Last Modified:26 Dec 2012 13:08

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