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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Strengthening in MULTIPHASE(MP35N) alloy: Part II. elevated temperature tensile and creep deformation
Rishi pal Singh,Roger D. Doherty +1 more
TL;DR: In this article, the authors investigated the strengthening mechanisms in the cobalt alloy MP35N by tensile and creep deformation at elevated temperatures and by transmission electron microscopy (TEM) of the deformed alloy.
Journal ArticleDOI
Correlation versus randomization of jerky flow in an AlMgScZr alloy using acoustic emission.
TL;DR: The observed effects bear evidence to a competition between the phenomena of synchronization and randomization of dislocation avalanches, which may shed light on the mechanisms leading to a high variety of jerky flow patterns observed in applied alloys.
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Strain rate sensitivity prior to the onset of serrated yielding in a pressurized low carbon steel
Journal ArticleDOI
The Portevin–Le Châtelier Effect in a Metastable Austenitic Stainless Steel
A. Müller,C. Segel,Mikhail Linderov,Mikhail Linderov,Alexei Vinogradov,Alexei Vinogradov,Anja Weidner,Horst Biermann +7 more
TL;DR: In this paper, the authors investigated the Portevin-Le Châtelier (PLC) effect in a high-alloy metastable CrMnNi cast steel during tensile tests for the range of deformation temperatures between 293-K and 413-K (20 −C and 140 −C) and for nominal strain rates ranging between 10−4 and 10−1 s−1.
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Peierls barrier characteristic and anomalous strain hardening provoked by dynamic-strain-aging strengthening in a body-centered-cubic high-entropy alloy
Shuying Chen,Ling Wang,W. D. Li,Yang Tong,Ko-Kai Tseng,Che-Wei Tsai,Jien-Wei Yeh,Yang Ren,Wei Guo,Jonathan D. Poplawsky,Peter K. Liaw +10 more
TL;DR: In this paper, the temperature effect on the mechanical behavior of the HfNbTaTiZr high entropy alloy (HEA) was investigated at 77-673 K. The decrease of the yield strength with increasing the temperature was observed.
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.
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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.
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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.