Journal ArticleDOI
On the Yield Stress of Copper Crystals
TLDR
In this article, the dislocation density and arrangement in the crystals were determined before, during, and after the deformations using an etch pit technique, and the yield stress was determined by the stress necessary to break the gliding dislocations through impurity atom barriers.Abstract:
99.999% copper crystals were deformed in tension using an Instron tensile tester, and the dislocation density and arrangement in the crystals were determined before, during, and after the deformations using an etch pit technique. For crystals of low initial dislocation density, it was found that a large amount of dislocation multiplication occurred prior to yielding. Experimental relationships of dislocation density versus applied stress and versus shear strain were determined. It was found that the yield stress was not related to the initial dislocation density or arrangement. The yield stress was postulated to be determined by the stress necessary to break the gliding dislocations through impurity atom barriers in the crystal.read more
Citations
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Journal ArticleDOI
The plasticity of pure single crystals
TL;DR: The theory of the workhardening curve of a pure single crystal is discussed in this paper, where an outline is given of the experimental methods available for the study of the mechanism of plastic deformation and work hardening.
Journal ArticleDOI
Early stages of fatigue in copper single crystals
TL;DR: In this paper, the dislocation sub-structure and surface markings formed during the early stages of fatigue in copper single crystals at room temperature were studied and the merits of various proposed mechanisms for fatigue are discussed.
Journal ArticleDOI
Dislocation distributions in deformed copper single crystals
Z. S. Basinski,S. J. Basinski +1 more
TL;DR: In this article, the slip lines on the cross slip plane were observed from the earliest stages of deformation and their character changed during the transition to stage II, showing that the distribution of forest dislocations is much more isotropic and less homogeneous than that of disllocations crossing other planes.
Journal ArticleDOI
Substructure of type 316 stainless steel deformed in slow tension at temperatures between 21° and 816°C
TL;DR: In this paper, the substructure developed during the slow tensile deformation of Type 316 stainless steel at temperatures between 21° and 816°C has been investigated by transmission electron microscopy.
Journal ArticleDOI
Micro-plasticity and recent insights from intermittent and small-scale plasticity
Robert Maaß,Peter M. Derlet +1 more
TL;DR: In this paper, the authors discuss and review connections between classical micro-plasticity and intermittent flow across all length scales, with the aim of highlighting the value of miniaturized testing as a means to unravel this very early regime of bulk plasticity.
References
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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.
Journal ArticleDOI
Etch Pits at Dislocations in Copper
TL;DR: In this paper, a possible mechanism for the development of pits at dislocations in copper by etching in solution is presented, and experiments are described which may substantiate this mechanism.
Journal ArticleDOI
Acid Cutting and Acid Polishing of Copper Crystals
F. W. Young,T. R. Wilson +1 more
TL;DR: In this article, an acid saw and an acid polisher were used for cutting and polishing copper crystals, and evidence was presented that the cutting did not introduce dislocations into the crystals.
Journal ArticleDOI
Elastic‐Plastic Transition in Copper Crystals as Determined by an Etch‐Pit Technique
TL;DR: In this paper, the authors used pure bending moment (Pfister's moment) to stress a set of coarse-grained copper (99.999%) crystals with a dislocation density of 50/mm2 and found that the resolved stress necessary to move grown-in dislocations was about 4 g/mm 2.