Journal ArticleDOI
Theory of the effect of dynamic strain aging on mechanical properties
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In this paper, the authors described dynamic strain aging (DSA) in solid solutions as diffusion of solute atoms to mobile dislocations, temporarily arrested at obstacles, and calculated the dependence of the flow stress on strain rate, temperature, and strain in the presence of DSA.Abstract:
Dynamic strain aging (DSA) in solid solutions is described as diffusion of solute atoms to mobile dislocations, temporarily arrested at obstacles. As a consequence the solute concentration experienced locally by the dislocations depends on the time of arrest and the solute diffusion coefficient. Starting from this idea the dependence of the flow stress on strain rate, temperature, and strain in the presence of DSA is calculated. A criterion for the onset of serrated yielding is formulated. Finally the change in strain rate sensitivity due to DSA is calculated. The theory allows a qualitative and in some respects a quantitative comparison with experimental results of which some examples are given.read more
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Flow stress and work-hardening behaviour of Al–Mg binary alloys
TL;DR: In this paper, an analysis of flow stress and work hardening behavior has been carried out in series of Al-Mg solid solutions between 4-K and 298-K. The results reveal that the yield stress decreases linearly with the temperature and increases approximately linear with the Mg content in the solution.
Journal ArticleDOI
Spatial coupling in jerky flow using polycrystal plasticity
Schalk Kok,M. S. Bharathi,Armand Joseph Beaudoin,Claude Fressengeas,G. Ananthakrishna,L.P. Kubin,Mikhail Lebyodkin +6 more
TL;DR: In this paper, a multiscale approach including a finite element framework for polycrystal plasticity is used to model jerky flow, also known as the Portevin-Le Chatelier effect.
Journal ArticleDOI
Recent Progress in Discrete Dislocation Dynamics and Its Applications to Micro Plasticity
Giacomo Po,Mamdouh S. Mohamed,Mamdouh S. Mohamed,Tamer Crosby,Can Erel,Anter El-Azab,Nasr M. Ghoniem +6 more
TL;DR: In this paper, the authors present a self-contained review of the discrete dislocation dynamics (DDD) method for the numerical investigation of plasticity in crystals, focusing on recent development and implementation progress.
Journal ArticleDOI
Solute strengthening of both mobile and forest dislocations: The origin of dynamic strain aging in fcc metals
M.A. Soare,William A. Curtin +1 more
TL;DR: In this paper, a full rate-dependent constitutive theory for dynamic strain aging is developed based on two key ideas: both solute strengthening and forest strengthening must exist and must exhibit aging phenomena.
References
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Journal ArticleDOI
A model for the Portevin-Le Chatelier effect in substitutional alloys
TL;DR: In this article, the authors derived a model for the onset of the Portevin-Le Chatelier effect in substitutional alloys, based on the solute locking of dislocations temporarily arrested at obstacles in the glide path.
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Mathematics of the portevin-le chatelier effect
TL;DR: In this article, it is shown mathematically that the strain rate at any point in the tensile material must make jumps as a function of time, whenever the stress as the function of strain rate, for given strain, goes through a maximum and minimum.
Journal ArticleDOI
Serrated yielding and inhomogeneous deformation in Au(14at%Cu)
A. Wijler,J.Schade van Westrum +1 more
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The onset of serrated yielding in Au(Cu) alloys
TL;DR: In this article, the onset of serrated yielding in Au(Cu) alloys has been investigated as a function of strain rate, temperature, Cu concentration and initial state of order both in prequenched and furnace cooled specimens.