期刊
ACTA MATERIALIA
卷 202, 期 -, 页码 170-180出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2020.10.037
关键词
Constitutive behavior; Taylor-Quinney coefficient; Thermomechanical conversion; Thermodynamics; Thermodynamic dislocation theory; Dislocation plasticity; Aluminum alloy
资金
- DOE/DOD Joint Munitions Program
- DOE/DOD LANL LDRD Program [20170033DR]
- University of Wisconsin Alumni Research Foundation
By using a partitioned-energy thermodynamic framework, constraints on the Taylor-Quinney coefficient in plastic deformation have been derived based on atomic configurational disorder. Finite-element analysis of experiments on aluminum alloy has shown good agreement between theory and experiment, with computed values of the Taylor-Quinney coefficient increasing with strain in different materials.
Using a partitioned-energy thermodynamic framework which assigns energy to that of atomic configurational stored energy of cold work and kinetic-vibrational, we derive an important constraint on the Taylor-Quinney coefficient, which quantifies the fraction of plastic work that is converted into heat during plastic deformation. Associated with the two energy contributions are two separate temperatures - the ordinary temperature for the thermal energy and the effective temperature for the configurational energy. We show that the Taylor-Quinney coefficient is a function of the thermodynamically defined effective temperature that measures the atomic configurational disorder in the material. Finite-element analysis of recently published experiments on the aluminum alloy 6016-T4 [1], using the thermodynamic dislocation theory (TDT), shows good agreement between theory and experiment for both stress-strain behavior and temporal evolution of the temperature. The simulations include both conductive and convective thermal energy loss during the experiments, and significant thermal gradients exist within the simulation results. Computed values of the differential Taylor-Quinney coefficient are also presented and suggest a value which differs between materials and increases with increasing strain. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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