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Titolo:
Slip transfer of deformation twins in duplex gamma-based Ti-Al alloys. Part I. Transfer across gamma-gamma coherent twin interfaces
Autore:
Gibson, MA; Forwood, CT;
Indirizzi:
Commonwealth Sci & Ind Res Org, Clayton S MDC, Vic 3169, Australia Commonwealth Sci & Ind Res Org Clayton S MDC Vic Australia 3169 Australia
Titolo Testata:
PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS ANDMECHANICAL PROPERTIES
fascicolo: 12, volume: 80, anno: 2000,
pagine: 2747 - 2783
SICI:
1364-2804(200012)80:12<2747:STODTI>2.0.ZU;2-K
Fonte:
ISI
Lingua:
ENG
Soggetto:
TITANIUM ALUMINIDES; INTERSECTIONS; BOUNDARIES; CRYSTALS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
28
Recensione:
Indirizzi per estratti:
Indirizzo: Gibson, MA Commonwealth Sci & Ind Res Org, Private Bag 33, Clayton S MDC, Vic 3169, Australia Commonwealth Sci & Ind Res Org Private Bag 33 Clayton SMDC Vic Australia 3169
Citazione:
M.A. Gibson e C.T. Forwood, "Slip transfer of deformation twins in duplex gamma-based Ti-Al alloys. Part I. Transfer across gamma-gamma coherent twin interfaces", PHIL MAG A, 80(12), 2000, pp. 2747-2783

Abstract

The interactions of (1)/(6)[112]{111}gamma twinning dislocations with {111}gamma-{(1) over bar(1) over bar(1) over bar}(T) coherent twin interfaces, intersecting along both [101]gamma (30 degrees -type) and [110]gamma ledge-type) directions, in duplex Ti-Al alloys after room-temperature deformationin tension, have been investigated by transmission electron microscopy. The dislocation reactions involved in each of these types of interaction thatdescribe the slip transfer processes have been fully identified using image matching between experimental and computed images and are discussed and interpreted in terms of the direction of the applied tensile stress. Slip transfer of incoming 30 degrees -type (1)/(6)[112]{111}gamma dislocations across the {111}gamma-{(1) over bar(1) over bar(1) over bar}(T) coherent twin interface occurs via the transmission of (1)/(2)[110]{111}(T) slip dislocations and (1)/(6)[112]{111}(T) twinning dislocations into the twinned gamma phase in association with the motion of (1)/(6)[112]{111}gamma-(T) twinningdislocations in the plane of the coherent twin interface. For the interaction involving incoming edge-type (1)/(6)[112]{111}gamma dislocations with {111}gamma-{(1) over bar(1) over bar(1) over bar}(T) coherent twin interfaces, transfer occurs via (1)/(2)[110][001}(T) slip dislocations which are transmitted into the twinned gamma phase in association with (1)/(2)[110]{001}gamma slip dislocations which are 'reflected' back into the matrix gamma phase, and under some circumstances this is also coupled with the motion of (1)/(6)[112]{111}(gamma -T) twinning dislocations in the plane of the coherent twin interface.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 07/08/20 alle ore 20:41:41