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Description of millisecond Ohmic heating and forming of metallic glasses

Liu, Xiao and Demetriou, Marios D. and Kaltenboeck, Georg and Schramm, Joseph P. and Garrett, Glenn R. and Johnson, William L. (2013) Description of millisecond Ohmic heating and forming of metallic glasses. Acta Materialia, 61 (8). pp. 3060-3067. ISSN 1359-6454. doi:10.1016/j.actamat.2013.01.066.

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A quantitative description of the millisecond capacitive discharge heating and forming process built on a finite-element simulation platform is introduced. The platform incorporates thermodynamic and rheological models that extend beyond the supercooled liquid regime accessible by conventional calorimetry and rheology, accessing the regime that has just recently been uncovered via millisecond Ohmic heating. For the first time, a description of the dynamic glass transition is introduced and incorporated into the platform. The platform accurately simulates the process evolution and the thermodynamic and rheological response of the metallic glass, providing excellent agreement with experiments. Features such as the rapid temperature response, a dynamic glass-transition accommodated by a broad enthalpy recovery, a remarkable temperature and deformational uniformity, and an enthalpy trend that validates the adiabatic constraint, are accurately simulated. The platform is considered a useful tool for modeling the dynamic response and process evolution of metallic glasses under rapid uniform heating.

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Additional Information:© 2013 Acta Materialia Inc. Published by Elsevier Ltd. Received 25 May 2012; received in revised form 30 January 2013; accepted 30 January 2013; Available online 1 March 2013. Authors acknowledge partial support by the II-VI foundation.
Funding AgencyGrant Number
Subject Keywords:Amorphous metals; Thermoplastic forming; Rheology; Calorimetry; Capacitive discharge
Issue or Number:8
Record Number:CaltechAUTHORS:20130528-081219724
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Official Citation:Xiao Liu, Marios D. Demetriou, Georg Kaltenboeck, Joseph P. Schramm, Glenn R. Garrett, William L. Johnson, Description of millisecond Ohmic heating and forming of metallic glasses, Acta Materialia, Volume 61, Issue 8, May 2013, Pages 3060-3067, ISSN 1359-6454, 10.1016/j.actamat.2013.01.066.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:38672
Deposited By: Tony Diaz
Deposited On:31 May 2013 19:39
Last Modified:09 Nov 2021 23:39

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