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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The Portevin-Le Chatelier (PLC) effect and shear band formation in an AA5754 alloy
TL;DR: In this article, a noncontact strain measurement technique based on digital image correlation (DIC) analysis was used in order to observe PLC band behavior during tensile deformation of AA5754 sheet and subsequently to measure the level of incremental plastic strain carried within the bands.
Journal ArticleDOI
A predictive mechanism for dynamic strain ageing in aluminium-magnesium alloys.
TL;DR: An analytic expression for the strengthening versus strain rate and temperature that justifies widely used phenomenological forms is derived, and the predicted strengthening quantitatively agrees with the experimentally derived behaviour of Al–2.5% Mg at 300 K.
Journal ArticleDOI
Three types of Portevin–Le Chatelier effects: Experiment and modelling
Huifeng Jiang,Qingchuan Zhang,Xuedong Chen,Zhongjia Chen,Zhenyu Jiang,Xiaoping Wu,Jinghong Fan +6 more
TL;DR: By employing the dynamic digital speckle pattern interferometry (DSPI) technique, three types of Portevin-Le Chatelier (PLC) effects were investigated systematically, with emphasis on the temporal and spatial dynamic features as discussed by the authors.
Journal ArticleDOI
The strain dependence of static and dynamic strain-aging
A. van den Beukel,U.F. Kocks +1 more
TL;DR: In this article, a model that combines possible aging effects on the friction stress and on forest hardening is proposed, and the dependence of both static and dynamic strain-aging on strain is predicted and compared with available experimental information.
Journal ArticleDOI
On the Portevin–Le Chatelier effect: theoretical modeling and numerical results
Egidio Rizzi,P. Hähner +1 more
TL;DR: In this article, a new model is presented for a physically consistent description of plastic material instabilities referred to as Portevin-Le Chatelier (PLC) effect, namely the oscillatory plastic flow that may be observed in metallic alloys subjected to load-or displacement-controlled plastic deformation in a certain range of strain, strain rate and temperature.
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.