Dislocation Multipoles in Slightly Deformed Cu–10 at%Al Single Crystals

Fujita, Hiroshi; Sumida, Naoto; Kimura, Shirdo; Takemoto, T.

doi:10.1143/jpsj.51.577

Cited by 13 publications

(3 citation statements)

References 13 publications

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“…122, 23]), mostly for the case of vanishing friction stress, aiming a t the determination of the passing stress of dislocation groups in dependence on the spacing of their slip planes. The role of friction was examined for a few pairs of screw dislocations in 1241; the stresses within multiDoles were considered in detail including effects of dislocation v splitting by Comins @ 5 ] , and mechanisms of multipole formation were discussed in [26,27].…”

Section: Formation Of Dislocation Multipolesmentioning

confidence: 99%

Dislocation groups, multipoles, and friction stresses in α-CuZn alloys

Olfe

Neuhäuser

1988

Phys. Stat. Sol. (a)

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Characteristic features of the dislocation structure developed in the first stage of deformation of single-glide oriented crystals of concentrated f.c.c. alloys like a-CuZn are extended niultipoles in the primary slip planes. Their various configurations are explained by considering their formation in the case that the dislocations destroy part of the friction stress by cutting through the effective obstacles which in this alloy are assumed to be short-range ordered clusters. This obstacle destruction mechanism which should occur quite generally in concentrated alloys favours the development of extended dislocation groups. It is shown that in this case the original value of the friction strrss may well exceed the macroscopically measured critical resolved shear stress. Charakteristisches Merkmal der Versetzungsstruktur im Bereich I der Verformung von fur Einfachgleitung orientierten Einkristallen konzentrierter k.f.2.-Legierungen wie a-CuZn sind ausgedehnte Multipole auf den priniaren Gleitebenen. Ihre verschiedenen Konfigurationen lassen sich aus ihrer Bildung dann erklaren, wenn die Versetzungen einen Teil der Reibungsspannung beim Durchschneiden der effektiven Hindernisse abbauen, die in dieser Legierung als nahgeordnete Cluster vermutet werden. Dieser Mechanismus des Hindernisabbaus, der ganz allgemein in konzentrierten Legierungen auftreten sollte, begiinstigt die Bildung groRer Versetzungsgruppen. Es wird gezeigt, daR in diesem Fall der ursprungliche Reibungsspannungswert, deutlich iiber der makroskopisch gemessenen kritischen Schubspannung liegen kann.

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Section: Formation Of Dislocation Multipolesmentioning

confidence: 99%

Dislocation groups, multipoles, and friction stresses in α-CuZn alloys

Olfe

Neuhäuser

1988

Phys. Stat. Sol. (a)

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“…The storage of dislocation is due to a continuous production of "sessile" dislocation configuration (locks, jogs, debris, cross-slipped segments …), obstacles with shearing strain that anchor the captured mobile dislocations into bundles or boundaries [84]. The numerical [85] and experimental [62,86,87] studies confirm that crossslip strongly favours the emergence of ordered dislocation structures through, for example, a progressive transformation of pile-up to a dipoles and multipoles bundle. However, it is not the only possibility explaining the phenomenon of patterning.…”

Section: Discussionmentioning

confidence: 94%

Effects of grain size on dislocation organization and internal stresses developed under tensile loading in fcc metals

Feaugas

Haddou

2007

Philosophical Magazine

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“…Experimental results on the study of the dislocation structure by transmission electron microscope showed that for alloys with a low stacking fault energy, to which the investigated alloy belongs, at moderate deformations, the network dislocation structure prevails. [42][43][44]. With the development of deformation, twinning occurs along with slip.…”

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confidence: 99%

Growth and Deformation Simulation of Aluminum Bronze Grains Produced by Electron Beam Additive Manufacturing

Nikonov

Лычагин

Bibko

et al. 2022

Metals

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When working out 3D building-up modes, it is necessary to predict the material properties of the resulting products. For this purpose, the crystallography of aluminum bronze grains after electron beam melting has been studied by EBSD analysis methods. To estimate the possibility of sample form changes by pressure treatment, we simulated structural changes by the method of molecular dynamics during deformation by compression of individual grains of established growth orientations. The analysis was carried out for free lateral faces and grain deformation in confined conditions. Simulation and experiments on single crystals with free lateral faces revealed the occurrence of stepwise deformation in different parts of the crystal and its division into deformation domains. Each domain is characterized by a shear along a certain slip system with the maximum Schmidt factor. Blocking the shear towards the lateral faces leads to selectivity of the shear along the slip systems that provide the required shape change. Based on the simulation results, the relationship between stress–strain curves and structural characteristics is traced. A higher degree of strain hardening and a higher density of defects were found upon deformation in confined conditions. The deformation of the columnar grains of the built material occurs agreed with the systems with the maximum Schmidt factor.

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Dislocation Multipoles in Slightly Deformed Cu–10 at%Al Single Crystals

Cited by 13 publications

References 13 publications

Dislocation groups, multipoles, and friction stresses in α-CuZn alloys

Dislocation groups, multipoles, and friction stresses in α-CuZn alloys

Effects of grain size on dislocation organization and internal stresses developed under tensile loading in fcc metals

Growth and Deformation Simulation of Aluminum Bronze Grains Produced by Electron Beam Additive Manufacturing

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