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Validity of temperature and time equivalence in metallic glasses during shear deformation

Zink, Mareike and Samwer, K. and Johnson, W. L. and Mayr, S. G. (2006) Validity of temperature and time equivalence in metallic glasses during shear deformation. Physical Review B, 74 (1). Art. No. 012201. ISSN 1098-0121. doi:10.1103/PhysRevB.74.012201.

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Competing internal and external time scales, which are determined by temperature and experimental sampling time—viz., reciprocal frequency—respectively, are essentials for understanding the physics of glasses and the glass transition. A temperature increase should ideally affect thermally activated phenomena in a similar manner as an increase of sampling time at constant temperature. We investigate the validity of this empirical principle by its manifestations in mechanical properties—viz., the temperature and strain rate dependence of the shear modulus and yield stress of a CuTi model glass in molecular dynamics computer simulations. In equivalence to the temperature-dependent glass transition, we identify a shear-rate-dependent glass transition below a certain threshold. Beyond that, deviations occur in a highly non-Newtonian regime.

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Additional Information:©2006 The American Physical Society (Received 22 April 2006; revised 22 May 2006; published 5 July 2006) M.Z., K.S., and S.G.M. acknowledge financial support by the German DFG-SFB 602 and G.I.F., No. G-2103-1428.14/2004, as well as the GWDG Gesellschaft für wissenschaftliche Datenverarbeitung Göttingen, Germany for a grant of computing time.
Subject Keywords:metallic glasses; shear deformation; glass transition; shear modulus; yield stress; molecular dynamics method; copper alloys; titanium alloys
Issue or Number:1
Record Number:CaltechAUTHORS:ZINprb06b
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:4502
Deposited By: Archive Administrator
Deposited On:25 Aug 2006
Last Modified:08 Nov 2021 20:17

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