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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Constitutive Model Over Wide Temperature Range and Considering Negative-to-Positive Strain Rate Sensitivity for As-Quenched AA2219 Sheet
TL;DR: In this article, a phenomenological constitutive model was proposed, in which the negative-to-positive SRS and the coupling effects of the strain and temperature were considered, and a new coupling effect term for the temperature and strain was constructed to consider these effects.
Book ChapterDOI
Dynamical Effects in Deformation
TL;DR: In this article, the importance of collective dislocation effects in connecting the single dislocation behaviour with macroscopic plasticity is emphasized with examples of inhomogeneity of deformation and discontinuities of deformations.
Journal ArticleDOI
Reply to comment on the strain rate sensitivity during serrated yielding
TL;DR: In this article, auteur de l'auteur au commentaires de Kubin et Estrin et aux conclusions differentes des siennes auxquelles ils sont arrives.
Journal ArticleDOI
Robust bonding and microstructure behavior of aluminum/high-strength steel lap joints using resistance element welding process for lightweight vehicles: Experimental and numerical investigation
TL;DR: In this article , the resistance element welding (REW) process was used for the automotive structural assembly process and robust bonding was achieved exceeding 9 kN of tensile-shear strengths with excellent failure energies from the welding currents in 6.5 kA-10.5kA without any common weld defects.
Journal ArticleDOI
Thermomechanical processing of an ultralight Mg-14Li-1Al alloy
TL;DR: In this paper, the microstructure, hot compression flow stress curve, and indentation load/displacement plots of a Mg-14Li-Al (wt%) alloy, considered as the lightest metallic alloy, are analyzed through microstructures, hot compressive flow stress curves, and nanoindentation load and displacement 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.