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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Cryogenic manufacturing processes
I.S. Jawahir,Helmi Attia,Dirk Biermann,Joost Duflou,Fritz Klocke,Daniel Meyer,Stephen T. Newman,Franci Pušavec,Matthias Putz,Joël Rech,Volker Schulze,Domenico Umbrello +11 more
TL;DR: An overview of major cryogenic manufacturing processes, summarizing the state-of-the-art and significant developments during the last few decades, is presented in this article, with a summary of historic perspectives, including definitions, scope, and analysis of process mechanics and material performance covering tribological and thermo-mechanical interactions.
Journal ArticleDOI
Effects of Al on microstructure and tensile properties of C-bearing high Mn TWIP steel
Jae Eun Jin,Young Kook Lee +1 more
TL;DR: In this article, the effects of Al on microstructure, stacking fault energy, tensile properties and fractured surface in Fe-18Mn-06C-(0-2)Al twinning-induced plasticity (TWIP) steels were systemically investigated.
Journal ArticleDOI
On the origin of dynamic strain aging in twinning-induced plasticity steels
TL;DR: In this article, a diffusive jump of the C atom of the point defect complex in the stacking fault region is proposed to explain the room temperature dynamic strain aging in TWIP steel containing solute C.
Journal ArticleDOI
The portevin-Le Chatelier effect in deformation with constant stress rate
L.P. Kubin,Y. Estrin +1 more
TL;DR: In this article, a mathematical model is presented which provides a link between the microscopic and the macroscopic aspects of nonuniform plastic flow associated with the Portevin-Le Chatelier (PLC) effect.
Journal ArticleDOI
Strain rate sensitivity of the commercial aluminum alloy AA5182-O
R. C. Picu,Gabriela Vincze,Fahrettin Ozturk,José Grácio,Frédéric Barlat,Frédéric Barlat,Antoinette M. Maniatty +6 more
TL;DR: In this article, the effect of dynamic strain aging on ductility and strain hardening of commercial aluminum alloy AA5182-O was investigated at temperatures ranging from −120 to 150 ◦ C and strain rates from 10 −6 to 10 −1 s −1.
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.