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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Fracture behaviour and microstructural evolution of structural mild steel under the multi-hazard loading of high-strain-rate load followed by elevated temperature
Mahsa Mirmomeni,Amin Heidarpour,Xiao Ling Zhao,Christopher Hutchinson,Jeffrey A. Packer,Chengqing Wu +5 more
TL;DR: In this paper, the authors present the mechanical properties, microstructure evolution and fracture behaviour of structural mild steel subject to the multi-hazard loading scenario of post-impact-fire.
Journal ArticleDOI
Effect of heat treatments on the portevin-le chatelier effects in aluminium-silver alloys
TL;DR: In this article, the effect of solute content and heat treatment on occurrence of the P-L effect was investigated in Al-0.5 and 1.0 at.% alloys and the activation energies estimated from values of the critical strains were nearly equal to that for solute migration in AlMg alloys.
Journal ArticleDOI
The influence of specimen dimensions and machine stiffness on the portevin‐Le chatelier effect in an Al–Cu alloy
TL;DR: In this paper, the effect of specimen dimensions and tensile machine stiffness on the characteristics of type A and B serrated yielding in an Al-Cu alloy is investigated, and the results are discussed in terms of recent models of the Portevin-Le Chatelier effect.
Journal ArticleDOI
On the PLC Effect in a Particle Reinforced AA2017 Alloy
TL;DR: In this article, the deformation behavior of an age-hardenable Al-Cu alloy (AA2017) and of a particle reinforced AA2017 alloy (10 vol. % SiC) in two different conditions: solid solution annealed (W) and naturally aged (T4).
Posted Content
Character of the Dislocation Bands in the (A+B) regime of the Portevin-Le Chatelier effect in Al-2.5%Mg alloy
TL;DR: In this article, the authors investigated the PLC effect by deforming Al-2.5%Mg alloy in the strain rate regime where simultaneously two types (type B and type A) of serrations appeared in the stress strain curve.
References
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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.