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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Calorimetric analysis of Portevin-Le Chatelier bands under equibiaxial loading conditions in Al–Mg alloys: Kinematics and mechanical dissipation
TL;DR: In this article, the authors investigated the thermomechanical behavior of Al-Mg alloys submitted to equibiaxial loading until failure and characterized the calorimetric signature accompanying the formation and propagation of PLC bands induced by such a loading condition.
Journal ArticleDOI
Experimental studies of Portevin-Le Chatelier plastic instabilities in carbon-manganese steels by infrared pyrometry
TL;DR: In this paper, the dynamic strain aging (DSA) phenomenon that occurs in some materials under certain temperature and strain rate conditions can cause plastic strain localization in the form of PLC bands.
Journal ArticleDOI
MULTISCALE ENTROPY ANALYSIS OF THE PORTEVIN-LE CHATELIER EFFECT IN AN Al-2.5%Mg ALLOY
Apu Sarkar,P. Barat,P. Mukherjee +2 more
TL;DR: In this article, the complexity of the Portevin-Le Chatelier effect in Al-2.5%Mg polycrystalline samples subjected to uniaxial tensile tests is quantified.
Journal ArticleDOI
Jerky flow (the PLC effect) in Ll2 Al3Ti-based alloys
L Potez,G Lapasset,L.P. Kubin +2 more
Journal ArticleDOI
Plastic flow instability in a precipitation hardened AlZnMg alloy
J. Wood,P.G. McCormick +1 more
TL;DR: In this paper, the effect of precipitation hardening on the yield behavior in torsion of an Al-ZnMg alloy has been carried out and two modes of unstable yield behaviour were observed.
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.