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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Microstructural Characterization and Mechanical Behaviors of High Entropy Alloys at Room and Elevated-Temperatures
TL;DR: In this article, the authors present a survey of the state-of-the-art techniques for self-driving cars and their application in self-defense and self-defence.
Journal Article
Acoustic emission and the Portevin-Le Châtelier effect in tensile tested Al alloys processed by ARB technique
Andrzej Pawełek,Jan Kuśnierz,Joanna Bogucka,Zdzisław Jasieński,Zbigniew Ranachowski,Przemysław Ranachowski,Feliks Rejmund,Tomasz Dębowski +7 more
TL;DR: In this paper, the authors investigated the relation between acoustic emission and the Portevin-Le Châtelier (PL) phenomena occurring in tensile tested two kinds of aluminium alloys: not-predeformed and predeformed earlier using the technique of accumulative rolling banding.
Journal ArticleDOI
Influence de l'anisotropie structurale sur la plasticité nonuniforme de type Portevin — Le Chatelier
Kamel Chihab,K Bouabdalah +1 more
TL;DR: In this paper, the structural anisotropy and chemical composition of Al-base alloys have been investigated and the most important parameters of non-uniform deformation of the Poitevin-Le Chatelier effect are re-examined.
Journal ArticleDOI
Effects of nanosized precipitates on the Portevin-Le Chatelier behavior: Model prediction and experimental verification
Jian-Zhong Fan,Ngo Duc Tien +1 more
TL;DR: The influence of homogenously-distributed nanosized Al3(Sc, Zr) precipitates on the Portevin-Le Chatelier (PLC) behavior in a model AlMgScZr alloy was investigated by experimental characterization and theoretical modeling as mentioned in this paper .
Book ChapterDOI
Nonuniform Plastic Deformation and the Portevin-Le Chatelier Effect
L.P. Kubin,K. Chihab,Y. Estrin +2 more
TL;DR: In this paper, the spatial nonuniformity of plastic deformation bands is investigated. But the typical spacing within a pattern is orders of magnitude larger than the characteristic size of dislocation arrangements.
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.