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
Plastic strain localization in metals: origins and consequences
TL;DR: In this paper, the mechanisms and consequences of plastic strain localizations exhibited in tensile stress-strain behaviors, fracture and fatigue are discussed, including important practical considerations and historical background; then dislocation mechanics based details are developed in subsequent sections.
Journal ArticleDOI
Grain boundary ductile fracture in precipitation hardened aluminum alloys
A. K. Vasudévan,Roger D. Doherty +1 more
TL;DR: In this article, the authors reviewed microstructural studies of grain boundary (gb) fracture in precipitation hardened aluminum alloys with respect to the three main ideas that have been developed to explain the gb fracture surfaces.
Journal ArticleDOI
Influence of grain size on the mechanical behaviour of some high strength materials
Alain Lasalmonie,J. L. Strudel +1 more
TL;DR: In this article, the influence of grain size in complex alloys by incorporating the Hall-Petch stress as one component of the internal stress helps in rationalizing the existence of an optimal grain size where creep resistance is maximized.
Journal ArticleDOI
Hall-Petch relations for multilayered materials
Peter M. Anderson,C. Li +1 more
TL;DR: In this article, the critical resolved shear stress for slip transmission of a pile-up depends on layer thickness, component moduli, interface slip properties, source properties, and pile up orientation.
Journal ArticleDOI
Influence of texture on Hall–Petch relationships in an Mg alloy
TL;DR: In this paper, the influence of changes in crystallographic texture on the Hall-Petch (H-P) relationship for an Mg alloy was investigated, and the texture variations were facilitated by changing the uniaxial tensile loading orientation with respect to the normal direction of the rolled Mg plate.
References
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Book
Theory of Dislocations
John Price Hirth,Jens Lothe +1 more
TL;DR: Dislocations in Isotropic Continua: Effects of Crystal Structure on Dislocations and Dislocation-Point-Defect Interactions at Finite temperatures.
Journal ArticleDOI
The Deformation and Ageing of Mild Steel: III Discussion of Results
TL;DR: In this paper, an attempt is made to explain the observed phenomena in the yielding and ageing of mild steel, described in two previous papers, in the general terms of a grain-boundary theory.
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
Dislocation Velocities, Dislocation Densities, and Plastic Flow in Lithium Fluoride Crystals
W. G. Johnston,John J. Gilman +1 more
TL;DR: In this paper, the authors measured the velocities of individual dislocations in LiF, covering a range of twelve orders of magnitude in velocity, from 10−7 cm/sec to 105cm/sec.