Journal ArticleDOI
Theory of the effect of dynamic strain aging on mechanical properties
Reads0
Chats0
TLDR
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
More filters
Journal ArticleDOI
Plastic deformation mechanism transition with solute segregation and precipitation of 304 stainless steel foil induced by pulse current
TL;DR: In this paper , the effects of pulse current with various peak current densities on the mechanical properties and deformation mechanism of 304 stainless steel foil were investigated, and it was shown that the current causes the stress-strain curve to fluctuate in a serrated manner.
Journal ArticleDOI
Compressive flow behavior of Al–Si based alloy: Role of heat treatment
TL;DR: In this paper, a near eutectic Al-Si based cast alloy has been examined in compression at strain rates varying from 3 x 10(-4) to 10(2) s(-1) and at three different temperatures, i.e., room temperature (RT), 100 degrees C and 200 degrees C. The dependence of the flow behavior on heat treatment is studied by testing the alloy in non-heat treated (NHT) and heat treated (HT) conditions.
Journal ArticleDOI
Processing Age-Hardenable Alloys by Equal-Channel Angular Pressing at Room Temperature: Strategies and Advantages
TL;DR: In this article, the effect of the combination of natural aging and severe plastic deformation produced by Equal Channel Angular Pressing (ECAP) on the microstructure, the strength, as well as the ductility of age-hardenable AlZnMg alloys was investigated.
Journal ArticleDOI
Effect of solute concentration on the serrated flow in solution-treated Al–4%Cu alloys
TL;DR: In this article, the influence of solute concentration on the serrated flow was investigated by solution treatment and some dynamic parameters, such as critical time and the ultimate tensile strength, were obtained.
References
More filters
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.