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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Portevin–Le Chatelier effect: modeling the deformation bands and stress-strain curves
TL;DR: In this article , a model to account for band dynamics and the variability the bands exhibit is presented to reproduce the deformation with Dynamic Strain Aging, including disorder as a key parameter.
Journal ArticleDOI
Effect of Γ' Particles Morphology on Dynamic Strain Aging Behavior of Udimet 500 Superalloy
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Enhancing the tensile properties of Sn-Zn-Ag lead-free solder alloy by loading MgO nanoparticles and irradiation
TL;DR: In this article , the effects of loading 0.5 wt% MgO NPs and γ -irradiation doses (0−2.0 MGy) on the tensile properties of plain solder at different strain rates (ε•) were investigated.
Journal ArticleDOI
Modeling serrated flow of SS 316L under dynamic strain aging effect
TL;DR: In this paper, the serrated behavior of the stress-strain curves also known as PLC effect due to dynamic strain aging of SS 316L is investigated from room temperature to $ 550^{\circ}{\text{C}} $$¯¯¯¯.
Book ChapterDOI
Plastic Instability in an Al-Mg-Si Alloy
G.J. Lopriore,P.G. McCormick +1 more
TL;DR: In this paper, the occurrence of unstable yielding in a 6063 aluminium alloy has been investigated using torsion testing and two types of discontinuous yield behavior were observed, and the results were discussed in terms of mechanisms for unstable plastic flow.
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
Journal ArticleDOI
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.