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 effect of aluminum on the work hardening and wear resistance of hadfield manganese steel
TL;DR: In this article, a study was made of the work-hardening and wear resistance of aluminum-modified Hadfield manganese steels ranging in composition from 1.00 to 1.75 Pct carbon and from 0.0 to 4.0 Pct aluminum.
Journal ArticleDOI
The morphology of Portevin–Le Chatelier bands: finite element simulation for Al–Mg–Si
TL;DR: A constitutive model for dynamic strain ageing together with a three-dimensional finite element analysis were used to simulate discontinuous yielding behavior associated with the Portevin-Le Chatelier effect as discussed by the authors.
Journal ArticleDOI
On the characteristics of Portevin-Le Chatelier bands in aluminum alloy 5182 under stress-controlled and strain-controlled tensile testing
M. Abbadi,P. Hähner,A. Zeghloul +2 more
TL;DR: In this paper, the authors investigated the PLC effect in an Al-based alloy of the 5000 series, in a wide range of temperatures and loading rates, and found that the critical strain for the onset of repeated yielding increases with increasing loading rate at low temperatures and high loading rates.
Journal ArticleDOI
Dynamic strain ageing in Ni-base superalloy 720Li
TL;DR: In this article, an experimental investigation into the dynamic strain ageing (DSA) of a wrought Ni-base superalloy 720Li was conducted and the major characteristics of the serrations-i.e. critical plastic strain for onset of serrations, epsilon(c); (b) average stress decrement, Delta sigma(avg); and (c) strain increment between serrations.
Journal ArticleDOI
Dynamic strain aging studied at the atomic scale
TL;DR: In this paper, the atomistic origin of dynamic strain aging in an Al-4.8% Mg alloy using atom probe tomography (APT) and transmission electron microscopy (TEM) was studied.
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.