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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Onset of the Portevin-Le Chatelier Effect: Role of Synchronization of Dislocations
TL;DR: In this article, the problem of the onset of the Portevin-Le Chatelier (PLC) effect is revised by combining a study of the kinetics of the flow stress evolution upon abrupt changes in the applied strain rate and acoustic emission (AE) accompanying plastic deformation of an AlMg alloy.
Journal ArticleDOI
Serrated yielding in austenitic stainless steels
TL;DR: Agarwal et al. as discussed by the authors describe the Austrian stainless steels as a desirable property due to their desirable properties such as excellent mechanical properties and corrosion/oxidation resistance, such as serrated yieldin...
Journal ArticleDOI
Tensile strain measurement using mechanical and in situ optical techniques in bi-metallic Ni-base superalloys
M. Abbadi,F. de Haan,P. Hähner +2 more
TL;DR: In this paper, the performance of a nickel-base superalloy bi-material was investigated using an in situ image capture and processing technique adapted from particle image velocimetry, which showed a perfect correlation with the peculiarity of precise assessment of the local strain in the case of the optical method.
Journal ArticleDOI
Dynamic Interaction of Impurity Atmospheres with Moving Dislocations during Stress Relaxation
G. H. Rubiolo,P. B. Bozzano +1 more
TL;DR: In this paper, the authors show that dilute solid solutions exhibit a distinct transition from concave upward to concave downward log σ-log e curves related with the Portevin-Le Chatelier effect as was described by Van den Beukel.
Journal ArticleDOI
Influences of in-situ ZrB2 and TiB2 particles on Portevin-Le Chatelier effect for AlSi9Cu1 alloy
TL;DR: In this paper, the plastic instability phenomenon Portevin-Le Chatelier effect (PLC) was investigated in AlSi9Cu1 alloy and the in-situ (ZrB2+TiB2)/AlSi9 Cu1 composites fabricated from the Al-K2TiF6-K 2ZrF6 -KBF4 system.
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.