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
Influence of carbon content on the microstructure, martensitic transformation and mechanical properties in austenite/ε-martensite dual-phase Fe–Mn–C steels
TL;DR: In this paper, the effects of carbon content on the martensitic transformation and its contribution to the work-hardening behavior of Fe-Mn-C steels during tensile deformation based on analysis by X-ray diffraction and transmission electron microscopy was reported.
Journal ArticleDOI
Strain rate sensitivity and evolution of dislocations and twins in a twinning-induced plasticity steel
TL;DR: In this paper, the effect of strain rates (10−3 to 103−s−1) on the deformation behavior of a twinning-induced plasticity (TWIP) steel was investigated.
Journal ArticleDOI
Dynamic strain aging and plastic instabilities
TL;DR: In this paper, a constitutive model proposed by McCormick based on dislocation-solute interaction and describing dynamic strain aging behavior was analyzed for the simple loading case of uniaxial tension.
Journal ArticleDOI
The rate dependence of the portevin-Le chatelier effect
L.P. Kubin,K. Chihab,Y. Estrin +2 more
TL;DR: In this paper, a general criterion for the occurrence of the Portevin-Le Chatelier effect, which incorporates the influence of the applied stress rate or strain rate, is obtained by examining the conditions for the vanishing of the microscopic strain rate sensitivity.
Journal ArticleDOI
Serrated flow and tensile properties of a Mg–Y–Nd alloy
Su-Ming Zhu,Jian Feng Nie +1 more
TL;DR: In this paper, the serrated flow in WE54 alloy during tensile deformation was analyzed in relation to the dynamic strain ageing (DSA) effect and the tensile properties were analysed in relation with the DSA effect.
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.