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
Citations
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Book ChapterDOI
Effect of Grain Size on the Deformation Behaviour of Nickel and Nickel Alloy Sheet
N.K. Park,B.A. Parker +1 more
TL;DR: In this paper, the effects of grain size on the work hardening behavior and strain rate sensitivity of electrolytic nickel and nickel alloy Inconel 200 have been investigated in terms of the effect of grain sizes on the dislocation mean free path and the strain ageing effects caused by the carbon present in InConel 200.
Journal ArticleDOI
Plastic instability in a heat-treatable aluminum alloy
Rafael Colás,A. Grinberg +1 more
TL;DR: In this paper, the effects that different heat treatments of a commercial aluminum alloy have on plastic instability and fractography were studied, and it was found that material heat treated to peak hardness has the highest susceptibility to localize deformation and the fracture aspect of specimens tested in tension changes from that of equiaxed to elongated dimples as the tendency for plastic instability increases.
Journal ArticleDOI
The effect of cyclic stressing on the Portevin-LeChatelier effect in Al-1.5% Mg alloy
Dong Hyuk Shin,Soo Woo Nam +1 more
Journal ArticleDOI
Temperature- and time-dependent behavior of Z2CN18.10 stainless steel under uniaxial loading
TL;DR: A series of uniaxial monotonic tensile tests were conducted on the piping specimens of Z2CN18.10 stainless steel within the temperature range from 20°C to 350°C at different strain rates as discussed by the authors.
Book ChapterDOI
The Portevin–Le Chatelier Effect at Constant Stress Rate: A Simple Mathematical Description
L.P. Kubin,Y. Estrin +1 more
TL;DR: In this article, the PLC bands and the associated jerky flow can be quantitatively estimated in a simple form for the case of testing with constant stress rate, using knowledge of the mechanical behavior in the domain of stable uniform flow.
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.