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
Citations
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Activation Energy Calculations for the Portevin–Le Chatelier Effect in Nimonic 263 Superalloy
TL;DR: In this article, the activation energy of serrated flow in the Nimonic 263 superalloy was investigated by tensile test in a wide temperature range, from room temperature to 1033 K (760 K) and at strain rates between 0.1 and 4 × 10−4 s−1.
Journal ArticleDOI
Approving Restoration Mechanism in 7075 Aluminum Alloy through Constitutive Flow Behavior Modeling
TL;DR: In this article, the work hardening-DRV and DRX-based models were used to derive activation energy map, strain rate sensitivity map, and processing maps for 7075 aluminum alloy.
Journal ArticleDOI
Some metallurgical aspects of Dynamic Strain Aging effect on the Low Cycle Fatigue behavior of C–Mn steels
TL;DR: In this article, two carbon-Manganese steels with a different sensitivity to DSA were investigated in the Low Cycle fatigue domain and the results of the DSA effect on LCF behavior in C-Mn and Low Alloyed steels reported in the literature are very confused and contradictories.
Journal ArticleDOI
Dislocation–solute cluster interaction in Al–Mg binary alloys
Zhijie Xu,R. C. Picu +1 more
TL;DR: In this article, the binding energy per unit length of dislocations to the thermodynamically stable solute atmospheres that form around their cores, at various temperatures and average solid solution concentrations is studied by means of atomistic simulations.
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Influence of dynamic strain aging on the mechanical properties and microstructural evolution for Alloy 800H during hot deformation
TL;DR: In this article, the effect of dynamic strain aging (DSA) on the mechanical properties and microstructure features was studied to reveal the underlying mechanism responsible for DSA. And the activation energy for the appearance of negative strain rate sensitivity was calculated to be 194 kJ/mol.
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.
Journal ArticleDOI
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.