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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Journal ArticleDOI
Repeated load relaxations of type 316 austenitic stainless steel
Simo-Pekka Hannula,Che Yu Li +1 more
TL;DR: In this paper, the authors showed that the shape of the load relaxation curve after reloading in a logarithmic stress vs. log-rate plot may differ from that after the initial loading.
Book ChapterDOI
The Dynamic Organization of Dislocation Structures
L.P. Kubin,J. Lépinoux +1 more
TL;DR: This approach is still faced with a few conceptual or technical difficulties, but it potentially provides a powerful tool for the derivation of semi-macroscopic or macroscopic time and length scales in terms of elementary dislocation mechanisms.
Journal ArticleDOI
Localization of plastic flow: spatial vs temporal instabilities
TL;DR: In this article, the initiation of unstable plastic deformation associated with dynamic strain ageing in controlled load rate tests has been studied, and the existence of two regimes of instability: temporal and spatial is found to occur by the growth of spatially uniform (temporal) strain rate oscillations.
Journal ArticleDOI
Solute clustering in Al–Mg binary alloys
D Zhang,R. C. Picu +1 more
TL;DR: In this paper, the authors studied the clustering of Mg in Al-Mg binary alloys by means of atomistic simulations and showed that Mg clusters at cores forming the coherent phase observed in the undistorted lattice at low temperatures.
Journal ArticleDOI
Effect of carbon on strain-rate and temperature sensitivity of twinning-induced plasticity steels: Modeling and experiments
TL;DR: In this article, a constitutive model, which rationalizes yielding as the thermally assisted bowing out of dislocations under the pinning effect of carbon solutes, is proposed, and for the first time quantitatively predicts the thermal activation parameters of TWIP steels as a function of carbon content.
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.