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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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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.
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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
Dislocation Mobility in Crystals
TL;DR: In this article, reaction rate theory is applied to dislocation motion and it is shown that when the activated complex is allowed two degrees of freedom, the activation energy is inversely proportional to applied stress, so the dislocation velocity, vd is related to the applied shear stress, τ by a relation of the form: v=v0e−D/τ, where v0 is the terminal velocity and D is called the characteristic drag stress.
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The Distribution of Dislocations in Linear Arrays
TL;DR: In this article, an approximate method for finding the equilibrium distribution of arrays of dislocations is given based on the assumption that an array of discrete dislocation may be replaced by a continuous distribution of smeared dislocations.
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Effects of grain size on the dislocation density and flow stress of niobium
TL;DR: In this article, the effect of grain size on the lower yield and flow stresses of fine-grained niobium is explained in terms of a work-hardening model, and a cellular network of dislocations developed for strains of the order of 10%.
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Effect of grain size on the lower yield and flow stress of iron and steel
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The plastic deformation of chromium at low temperatures
M.J. Marcinkowski,H.A. Lipsitt +1 more
TL;DR: In this paper, the effects of grain size and strain rate on the upper and lower yield stress and the flow stress at 3 per cent plastic strain have been thoroughly investigated from 100°C to −195°C for chromium tested in compression.