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- W2085152054 abstract "The purpose of this investigation was to study the crystal structure of the needle-like phase which appears in b.c.c. regions of water-quenched Fe-27.3 wt% Mn-6.7 wt% Al-0.22 wt% C alloy. The morphology, crystal structure, transformation mechanism and microstructure of the needle-like phase have been studied by transmission electron microscopy and electron diffraction. A structure change from the b.c.c. (matrix) to the 18R (5l)3 needle-like phase is proposed to occur by shearing in the <110 >b.c.c. directions of the {110}b.c.c. planes in a five-to-one sequence repeated three times. Since we find a close relationship between the {110}b.c.c. and {111}f.c.c., we can utilize an existing description of 18R (5l)3 as a stacking sequence of ABCABC−BCABCA−CABCAB−A in terms of {111}f.c.c. planes. Cette investigation avait pour but l'étude de la structure cristalline de la phase apiciforme apparaissant dans les régions base cubique centrée (b.c.c.) de l'alliage trempé FeMnAlC (27,3% Fe; 6,7% Mn; 0,22% Al; % C, pourcentages massiques). La morphologie, la structure cristalline, le mécanisme de transformation ainsi que la microstructure de la phase apiciforme ont été étudiés par microscopie lectronique de transmission (TEM) et diffraction électronique. La phase apiciforme présente une structure de dislocation 18R(5l)3, à longue périodicité, formée par entremêlement de six plans {111}f.c.c., et constituée de 18 de ces plans. La sequence empilée desplans {111}f.c.c. de la structure 18R(5l)3 est ABCABC−BCABCA−CABCAB−A. Une interprétation proposée du changement de structure de la matrice b.c.c. en phase apiciforme 18R(5l)3 est le cisaillement suivant les directions <110 >b.c.c. des plans {110}b.c.c.. La structure 18R(5l)3 est formée par cisaillement combiné à une séquence des 5 pou 1 avec trois cycles répétés sur les plans {111}f.c.c.. Zweck dieser Untersuchung was die Studie der Kristallstruktur einer nadelförmigen Phase, die in b.c.c.-Bereichen einer mit Wasser abgeschreckten Fe-27.3 Mn-6.7 Al-0.22 C Gewichts % Legierung auftritt. Die Morphologie, die Kristallstruktur, der Umwandlungsmechanismus und die Mikrostruktur der nadelförmigen Phase wurden mit Hilfe von Transmissions Elektronen Mikroskopie und Elektronen Diffraktion untersucht. Die nadelförmige Phase hat eine long-period stacking-fault Struktur, 18R(5l)3, entstanden durch das Verschieben jeder Gruppe mit 6 Ebenen und bestehend aus 18 dieser Ebenen. Die Stapelsequenz der {111}f.c.c. Ebenen der 18R(5l)3 Struktur ist ABCABC−BCABCA−CABCAB−A. Man vermutet, daβ eine Strukturverändeng der b.c.c. (Matrix) zur 18R(5l)3 nadelförmingen Phase durch das Scheren in die <110 >b.c.c. Richtungen der {110}b.c.c. Ebenen stattfindet. Die 18R(5l)3 Struktur entsteht durch die Scherung kombiniert in einer fünf-zu-eins Reihenfolge mit drei sich wider-holenden Kreisläufen auf den {111}f.c.c. Ebenen." @default.
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- W2085152054 date "1991-05-01" @default.
- W2085152054 modified "2023-10-17" @default.
- W2085152054 title "Long-period stacking-fault structure of the needle-like phase in a duplex FeMnAlC alloy" @default.
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- W2085152054 doi "https://doi.org/10.1016/0956-7151(91)90282-6" @default.
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