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 mechanism of dynamic strain aging for type A serrations in tensile curves of a medium-Mn steel
TL;DR: In this paper, the authors investigated the mechanism of dynamic strain aging (DSA) causing serrations in tensile flow curves of Fe-5.15Mn-0.37Si 0.0039N (wt%) medium-Mn steel specimens with triple phases of retained austenite (γR), ferrite (α) and tempered martensite (α'T).
Journal ArticleDOI
Mechanical properties and deformation behaviour of a niobium alloy with different carbon contents
Rengen Ding,Ian P. Jones +1 more
TL;DR: In this article, the mechanical behavior of Nb 35 Ti 6 Al 5 Cr 8 V (at.%) with different C contents (0, 1, 10 at.%) has been investigated.
Journal ArticleDOI
Dynamic and static strain aging effects in Fe-modified Ll2 Al3 Ti
Z.L. Wu,D.P. Pope,Vaclav Vitek +2 more
TL;DR: In this article, it was shown that at high temperatures the diffusivity of the solute atoms is high enough that the dislocations move together, thereby requiring no break-away of dislocation cores.
Journal ArticleDOI
Dynamic aging of dislocations in materials with a high crystalline relief: Competition between diffusion and impurity entrainment
TL;DR: In this article, a model of the dynamic interaction of dislocations with the impurity subsystem of crystals that have a high lattice potential relief (Peierls barriers) has been developed.
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.