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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 temperature on strain-rate sensitivity in high strength Al–Mg alloy sheet
TL;DR: In this paper, a comprehensive experimental work was performed to assess the temperature and strain-rate affected deformation behavior of commercial AlMg6 type, 1.0mm thick annealed sheet.
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Comparison of twinning evolution with work hardening ability in twinning-induced plasticity steel under different strain rates
TL;DR: In this article, a planar-oriented twinning-induced plasticity (TWIP) steel with grain sizes of 35 and 170μm was characterized and the effect of DTB on the work hardening ability and ductility of the TWIP steel was evaluated.
Journal ArticleDOI
Experimental study of the post-fire mechanical properties of Q690 high strength steel
Fang Wang,Eric M. Lui +1 more
TL;DR: In this paper, the post-fire mechanical properties of Q690 steel obtained experimentally are presented and empirical equations to estimate the post fire elastic modulus, yield strength, tensile strength and fracture strain are proposed.
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On dynamic strain ageing and the boundaries of stable plastic deformation studied on Cu-Mn polycrystals
A. Kalk,Ch. Schwink +1 more
TL;DR: In this paper, the authors present a complete map of the boundaries of stable plastic deformation characterized by critical stresses σ i (i = 1, 2, 3), for dilute f.c. CuMn polycrystals.
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.
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.