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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Solute concentration dependence of strength and plastic instabilities in Al-Mg alloys
TL;DR: In this paper, the authors investigated the dynamic strain aging in the Portevin-Le Chatelier effect and numerically analyzed the effect of DSA on serrated flow in Al-Mg alloys.
Journal ArticleDOI
A model for the flow stress and strain rate sensitivity in a refractory metal
R.E. Reed-Hill,Tuling Zhu +1 more
TL;DR: Theories connues du vieillissement par contrainte dynamique and nouvelle approche are described in this paper, with a relation entre le modele presente and la theorie anterieure de la dynamique des dislocations.
Journal ArticleDOI
Monotonous deformation behavior of ferritic FeCrAl alloy in the dynamic strain aging regime
TL;DR: In this article, the deformation behavior of a ferritic FeCrAl alloy at a temperature range from room temperature to 600°C was studied using the uniaxial tensile tests.
Journal ArticleDOI
A Critical Assessment of Cyclic Softening and Hardening Behavior in a Near-α Titanium Alloy During Thermomechanical Fatigue
TL;DR: In this paper, the authors studied the fatigue behavior of Ti-alloy Timetal 834 at two temperature intervals viz. 573 K to 723 K (300 K to 450 K) and 723K to 873 K (450 K to 600 K) under mechanical strain controlled cycling.
Journal ArticleDOI
A modified Johnson-Cook model of as-quenched AA2219 considering negative to positive strain rate sensitivities over a wide temperature range
TL;DR: In this article, a modified Johnson-Cook model is proposed to describe the quasi-static stress-strain responses over a wider temperature range, based on an extended Sigmoidal function and a proposed relation between flow stress and coupling effects of strain 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.