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phys stat sol (a)
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phys stat sol (a)
Article . 1979 . Peer-reviewed
License: Wiley TDM
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On grain boundary dislocations in plane matching grain boundaries

Authors: R. Schindler; J. E. Clemans; R. W. Balluffi;

On grain boundary dislocations in plane matching grain boundaries

Abstract

Plane matching (PM) boundaries are defined as boundaries in which a single stack of planes of indices (hkl) in each crystal adjoining the boundary is either parallel, or nearly parallel, and where no other significant lattice matching exists. A search is made (by transmission electron microscopy) for possible intrinsic secondary grain boundary dislocation (GBD) arrays which might be present in such boundaries possessing a variety of deviations from the exact PM condition. (002), (220), and (420) PM boundaries of controlled geometry are prepared in gold thin film bicrystal specimens. Wide ranges of twist and tilt deviations from the exact PM orientation are introduced, and the orientation of the boundary plane is also varied for cases of fixed crystal misorientation. Arrays consisting of parallel GBDs are found in the (002) and (220) boundaries but not in the (420) boundaries. The Burgers vector of the GBDs is parallel to hkl with a magnitude given by the (hkl) interplanar spacing. Arrays are found in boundaries with twist deviations as large as 4° and tilt deviations as large as 14° and with a wide range of grain boundary plane orientations. The results suggest that discrete GBDs should be present in a variety of (002), (111), and (220) PM boundaries over a considerable range of misorientation which in certain cases may be as large as 20°. Such boundaries should therefore appear rather frequently in general polycrystalline materials in agreement with the estimates of Warrington and Boon. It is pointed out that the physical basis for the stability of such GBD structures is not understood at present. “Plane-matching” (PM)-Grenzen sind als Grenzen definiert, in denen ein einzelner Stapel von Ebenen mit Indizes (hkl) in jedem an der Grenze anliegenden Kristall entweder parallel oder nahezu parallel ist und wo keine andere wesentliche Gitteranpassung existiert. Mittels Transmissionselektronenmikroskopie wird nach moglichen intrinsischen sekundaren Korngrenzenversetzungs-(GBD)-Anordnungen gesucht, die in derartigen Grenzen, die eine Vielzahl von Abweichungen von der exakten PM-Bedingung besitzen, vorhanden sein konnen. (002)-, (220)- und (420)-PM-Grenzen mit kontrollierter Geometrie werden in Dunnschicht-Bikristallproben von Gold hergestellt. Grose Bereiche von Twist- und Kipp-Abweichungen von der exakten PM-Orientierung werden eingefuhrt und die Orientierung der Grenzebene fur einige Falle fester Kristallfehlorientierung variiert. Anordnungen aus parallelen GBD werden in den (002)- und (220)-Grenzen jedoch nicht in den (420)-Grenzen gefunden. Der Burgersvektor der GBD ist parallel zu (hkl) mit einer Grose, die durch den Abstand zwischen den (hkl)-Ebenen gegeben ist. Anordnungen in Grenzen mit Twist-Abweichungen bis zu 4° und Kippabweichungen bis zu 14° und mit einem grosen Bereich von Korngrenzenebenenorientierungen werden gefunden. Die Ergebnisse geben einen Hinweis darauf, das diskrete GBD in einer Vielzahl von (002)-, (111)- und (220)-PM-Grenzen uber einen betrachtlichen Bereich von Fehlordnung, der in gewissen Fallen bis 20° betragen kann, existieren konnen. Derartige Grenzen sollten deshalb ziemlich haufig in allgemeinen polykristallinen Materialien in Ubereinstimmung mit Rechnungen von Warrington und Boon auftreten. Es wird darauf hingewiesen, das die physikalische Ursache fur die Stabilitat fur derartige GBD-Strukturen gegenwartig nicht verstanden wird.

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
24
Average
Top 10%
Top 10%
bronze