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Merging of the alpha and beta relaxations and aging via the Johari–Goldstein modes in rapidly quenched metallic glasses

Hachenberg, Jörg and Bedorf, Dennis and Samwer, Konrad and Richert, Ranko and Kahl, Annelen and Demetriou, Marios D. and Johnson, William L. (2008) Merging of the alpha and beta relaxations and aging via the Johari–Goldstein modes in rapidly quenched metallic glasses. Applied Physics Letters, 92 (13). Art. No. 131911. ISSN 0003-6951. doi:10.1063/1.2903697.

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This paper provides evidence that the physical aging of deeply and rapidly quenched metallic glasses is promoted by the Johari–Goldstein slow beta relaxation, resulting in a significant irreversible increase in the mechanical modulus on initial heating. Dynamic mechanical analysis has been used to characterize relaxation phenomena of a strong and a fragile metallic glass. In addition, we can extrapolate the temperature dependence of beta- and alpha-relaxation peaks to higher temperatures and calculate the merging temperature for both types of glasses.

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Additional Information:©2008 American Institute of Physics. Received 7 February 2008; accepted 7 March 2008; published 4 April 2008. The authors are very grateful for stimulating discussions with C.A. Angell and for experimental support by U. Bete. Financial support from the following programs are acknowledged: Deutsche Forschungsgemeinschaft through SFB 602 TP B8, Graduiertenkolleg 782, and Leibniz program. This work was also supported in part by the MRSEC Program of the National Science Foundation under Award No. DMR-0520565.
Subject Keywords:ageing, aluminium alloys, copper alloys, elastic moduli, metallic glasses, palladium alloys, silicon alloys, zirconium alloys
Issue or Number:13
Record Number:CaltechAUTHORS:HACapl08
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:10008
Deposited By: Archive Administrator
Deposited On:04 Apr 2008
Last Modified:08 Nov 2021 21:04

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