Journal ArticleDOI
The role of dislocations in the flow stress grain size relationships
J. C. M. Li,Y. T. Chou +1 more
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In this article, the authors reviewed the effects of pile ups of dislocations on the relation between yield or flow stress and grain size, and some non-pileup theories of yielding are critically reviewed.Abstract:
Calculations involving pile ups of dislocations, both analytical and numerical, using either discrete dislocations or continuous distribution of dislocations of infinitesimal Burgers vectors, are reviewed in the light of their effects on the relation between yield or flow stress and grain size. The limitations of the pileup models are discussed and some nonpileup theories of yielding are critically reviewed also. More critical experiments are still needed to reveal the fundamental mechanicm of yielding.read more
Citations
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Journal ArticleDOI
Singular Integral Equations. By N.I. Muskhelishvili. Translated fromthe 2nd Russian edition by J.R.M. Radok. Pp. 447. F1. 28.50. 1953. (Noordhoff, Groningen)
Journal ArticleDOI
Twinning-induced plasticity (TWIP) steels
TL;DR: In this paper, the authors present a review of recent developments in the field of deformation behavior of high manganese face-centered cubic γ-Fe alloys, referred to as twinning-induced plasticity, or TWIP, steels.
Journal ArticleDOI
Microstructure and deformation of two-phase γ-titanium aluminides
TL;DR: In this paper, the current knowledge on dislocation types and slip systems, the development of deformation substructures, factors controlling the mobility and multiplication of dislocations, interface related plasticity, solid solution and precipitate strengthening mechanisms as well as microscopic aspects of creep and fracture are addressed.
Journal ArticleDOI
The influence of grain boundaries on mechanical properties
TL;DR: The effect of interfaces on mechanical properties is considered in this paper, with emphasis on dislocation mechanisms and the atomic scale structure of boundaries, and Elastic and plastic compatibilities at boundaries are treated.
Journal ArticleDOI
Six decades of the Hall–Petch effect – a survey of grain-size strengthening studies on pure metals
TL;DR: In this paper, the authors gather the grain-size strengthening data from the Hall-Petch studies on pure metals and use this aggregated data to calculate best estimates of these metals' Hall-petch parameters.
References
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Journal ArticleDOI
Stresses on secondary systems due to piled-up groups of dislocations of arbitrary orientation
Z. S. Basinski,T. E. Mitchell +1 more
TL;DR: The case of 60° dislocations has been considered in this paper, where it is shown that the secondary slip on many secondary slip systems are large and are capable of producing secondary slip over distances of the order of the pile-up length.
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Recovery Processes during Creep of Fe-0.75% Mn
TL;DR: In this paper, the authors showed that the steady state creep of the alloy was in a thermodynamical steady state, and that a change in the dislocation network was the cause of the creep recovery.
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Grain boundary topography in tungsten
H.F. Ryan,J. Suiter +1 more
TL;DR: In this article, the field ion microscope (Muller 1960) with its better resolution could be expected to provide unambiguous information concerning the existence or otherwise of ledges a few atoms in height and this note describes some observations made with such a microscope.
Journal ArticleDOI
Linear arrays of moving dislocations piling-up against an obstacle
A. R. Rosenfield,G.T. Hahn +1 more
TL;DR: In this paper, it was shown that the time required for the dislocations to approach their equilibrium positions and to build up large stresses on the obstacle depends strongly on the stress sensitivity of dislocation velocity (here taken to be B = ∂Inv/∂gt); increasing values of B result in increasingly sluggish pile-up formation.
Journal ArticleDOI
Linear Dislocations in Nonuniform Stress Fields
Y. T. Chou,N. Louat +1 more
TL;DR: In this article, the authors investigated three basic types of stress fields: the finite power series, the simple exponential and simple trigonometric functions, and found that the number of dislocations in a piled-up array is particularly sensitive to the relative magnitude of the stress near the tail of the array.