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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Mesoscopic nature of serration behavior in high-Mn austenitic steel
Sukyoung Hwang,Myeong-heom Park,Yu Bai,Akinobu Shibata,Akinobu Shibata,Wenqi Mao,Hiroki Adachi,Masugu Sato,Nobuhiro Tsuji +8 more
TL;DR: In this paper, the mesoscopic nature of serration behavior in a high-Mn austenitic steel in connection with its characteristic localized deformation was thoroughly clarified in a typical high-mn steel, Fe-22Mn-0.6C (wt. %), with a face centered cubic (FCC) single-phase structure.
Journal ArticleDOI
Portevin-Le Chatelier plastic instabilities: characteristics of deformation bands
M. Dablij,A. Zeghloul +1 more
TL;DR: In this paper, a soft tensile machine in the stress rates range where Portevin-Le Chatelier (PLC) phenomena occur was tested on two aluminium-magnesium alloys (5182 and 5754).
Journal ArticleDOI
Strain rate dependence of compressive behavior in an Al-Zn-Mg alloy processed by ECAP
TL;DR: In this paper, the compressive mechanical properties of an Al-Zn-Mg alloy after solid solution treatment and equal-channel angular pressing (SS-ECAP) using strain rates ranging from 1.0 to 3.0 s−1.
Journal ArticleDOI
Dynamic Strain-Aging Effect on Fracture Toughness of Vessel Steels
Journal ArticleDOI
Enhanced ductility in dynamic strain aging regime in a Fe-25Ni-20Cr austenitic stainless steel
TL;DR: In this paper, a Nb-containing and nitrogen stabilized Fe-25(wt%)Ni-20Cr austenitic stainless steel (Alloy 709) at temperatures from 623 K to 873 k at 10−4 s−1 where serrated flow is noted.
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.