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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A model for the flow stress and strain rate sensitivity of a substitutional alloy—Cu-3.1 at.% Sn
K.W. Qian,R.E. Reed-Hill +1 more
TL;DR: In this paper, an attempt was made to model these data in terms of a total flow stress composed of three components including an internal stress, an effective stress and a stress resulting from dynamic strain aging.
Journal ArticleDOI
Viscoplastic models for high temperature applications
TL;DR: The information specific to the material deformation behavior in stress analyses of structures and manufacturing processes is contained in the material model or the constitutive equation as mentioned in this paper, and it is recommended that these models be carefully reviewed, further developed when needed and recommended by interdisciplinary, technology specific committees of materials, mechanics, testing and computing experts.
Journal ArticleDOI
Flow and fracture behavior of aluminum alloy 6082-T6 at different tensile strain rates and triaxialities.
TL;DR: In this study, the average stress triaxiality and equivalent plastic strain at facture obtained from numerical simulations were used for the calibration of J-C fracture model and exhibits higher accuracy than the J- C fracture model obtained by the common method in predicting the fracture behavior of AA6082-T6.
Journal ArticleDOI
The portevin-le chatelier effect. A kinetic theory
TL;DR: The PLC effect is caused by the cooperative behavior of many dislocations as discussed by the authors, where aging can either increase the strength of the obstacle or it can deplete the population.
Journal ArticleDOI
The Critical Conditions for Jerky Flow. Discussion and Application to CuMn Solid Solutions
L. P. Kubin,Y. Estrin +1 more
TL;DR: In this paper, three particular intervals of temperature, labelled α, β, and γ, are examined, which correspond to different patterns of behaviour of the critical strains of smooth and jerky flow.
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.