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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Crossover from continuous to discontinuous propagation in the Portevin–Le Chatelier effect
TL;DR: In this paper, the effects of strain rate and temperature unsteadiness on the extent of the PLC effect, the type of instability and the critical plastic strain for the onset of serrations are discussed.
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Depth-sensing indentation tests in studying plastic instabilities
TL;DR: In this paper, a review of the phenomenon of plastic instabilities occurring in depth-sensing indentation measurements is presented focusing on the characterization of Portevin-Le Châtelier type instabilities observed in different metal alloys during indentation.
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Tensile deformation behavior and microstructure evolution of Ni-based superalloy 617
Djamel Kaoumi,K. Hrutkay +1 more
TL;DR: In this article, the mechanisms of deformation were investigated in a nickel-based alloy (Inconel 617) of interest for the Intermediate Heat Exchanger (IHX) for the very high temperature reactor (VHTR).
Journal ArticleDOI
Tensile deformation behavior of a nickel based superalloy at different temperatures
K. Hrutkay,Djamel Kaoumi +1 more
TL;DR: In this article, the temperature dependence of the tensile behavior of the Alloy Haynes 230 and the strain rate effect was studied by tensile tests in the temperature range of 25-950°C, at strain rates of 10 −3 ǫs −1, 10 −4 Ãǫ s −1, and 10 −5 õ s − 1.
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Plastic deformation of 1020 steel over a wide range of strain rates and temperatures
Amos Gilat,Xinrong Wu +1 more
TL;DR: In this paper, the response of hot-rolled 1020 steel over a wide range of temperatures and strain rates is investigated, and constitutive equations are developed for modeling the material response.
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.