State parameter-based constitutive modelling of stress strain curves in Al-Mg solid solutions
A novel and comprehensive approach addressing the stress strain response of binary Al-Mg alloys under uniaxial loading over a wide range of temperatures (78 K–650 K), strain rates (10−4–10 s−1) and solute contents (0 wt.%–5 wt.%) is developed and introduced. The model is based on the mechanical thre...
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Veröffentlicht in: | International journal of plasticity 2018-04, Vol.103, p.67-80 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | A novel and comprehensive approach addressing the stress strain response of binary Al-Mg alloys under uniaxial loading over a wide range of temperatures (78 K–650 K), strain rates (10−4–10 s−1) and solute contents (0 wt.%–5 wt.%) is developed and introduced. The model is based on the mechanical threshold Ansatz in combination with a Labusch type solid solution hardening approach and a model for dynamic strain ageing to describe the temperature and strain rate dependence of the yield stress in a thermal activation framework. Strain hardening is modelled on basis of the Kocks-Mecking evolution equations for the average dislocation density and discussed in terms of the temperature-dependence of the initial strain hardening rate and the saturation stress for stage-III hardening. Both, static and dynamic recovery, are fully taken into account. The model predictions are validated on experimental stress-strain curves reported in literature. The results demonstrate that the model successfully reproduces the complex temperature and strain rate dependent plastic deformation characteristics of Al-Mg alloys with a minimum of calibration input parameters.
•Stress strain curve model in Al-Mg for temperatures 78 K–650 K•Incorporation of dynamic strain ageing effect and negative strain rate sensitivity.•Dislocation density evolution as a function of temperature and strain rate.•Low number of calibration input parameters. |
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ISSN: | 0749-6419 1879-2154 |
DOI: | 10.1016/j.ijplas.2018.01.001 |