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
Citations
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A gradient-dependent model for the Portevin-Le Chatelier effect
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Kinetics of the portevin-le chatelier effect in Al 6061 alloy☆
R.B. Schwarz,L.L. Funk +1 more
TL;DR: In this paper, a tensile system designed to minimize its mechanical resonances was used for tensile tests on commercial Al 6061 alloys using a fast-response capacitance strain transducer.
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Mechanical properties of partially damaged structural steel induced by high strain rate loading at elevated temperatures - An experimental investigation
Mahsa Mirmomeni,Amin Heidarpour,Xiao Ling Zhao,Christopher Hutchinson,Jeffrey A. Packer,Chengqing Wu +5 more
TL;DR: In this paper, a comprehensive test program is carried out to investigate the post-impact fire properties of grade 350 steel under well-defined conditions, the results of which are reported in this paper Coupon specimens have undergone interrupting high strain rate tensile loading at impact level, controlled locally at different levels of elongation, to account for different deformation states.
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The plasticity of titanium at low and medium temperatures
S. Naka,L. P. Kubin,C. Perrier +2 more
TL;DR: The slip systems and plastic properties of normal and transition hexagonal metals are briefly reviewed in this article, where it is shown that the core of screw dislocations has a sessile three-dimensional configuration.
Journal ArticleDOI
On the similarity of plastic flow processes during smooth and jerky flow: Statistical analysis
Mikhail Lebyodkin,N. P. Kobelev,Y. Bougherira,Denis Entemeyer,Claude Fressengeas,V. S. Gornakov,T.A. Lebedkina,I. V. Shashkov,I. V. Shashkov +8 more
TL;DR: In this article, the authors investigated Jerky Flow in dilute alloys using statistical analysis of time series characterizing the evolution of the plastic activity at distinct scales of observation, namely, the macroscopic scale of stress serrations and a mesoscopic scale pertaining to the accompanying acoustic emission.
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
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.