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Titolo:
OCTAHEDRAL SLIP INSTABILITIES IN GAMMA GAMMA' SUPERALLOY SINGLE-CRYSTALS CMSX-2 AND AM3/
Autore:
KUBIN LP; LISIECKI B; CARON P;
Indirizzi:
OFF NATL ETUD & RECH AEROSP,OM,CNRS,BP 72,29 AV DIV LECLERC F-92322 CHATILLON FRANCE
Titolo Testata:
Philosophical magazine. A. Physics of condensed matter. Defects and mechanical properties
fascicolo: 5, volume: 71, anno: 1995,
pagine: 991 - 1009
SICI:
0141-8610(1995)71:5<991:OSIIGG>2.0.ZU;2-W
Fonte:
ISI
Lingua:
ENG
Soggetto:
NICKEL-BASE SUPERALLOY; PLASTIC INSTABILITIES; MICROSTRUCTURE; BEHAVIOR;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
23
Recensione:
Indirizzi per estratti:
Citazione:
L.P. Kubin et al., "OCTAHEDRAL SLIP INSTABILITIES IN GAMMA GAMMA' SUPERALLOY SINGLE-CRYSTALS CMSX-2 AND AM3/", Philosophical magazine. A. Physics of condensed matter. Defects and mechanical properties, 71(5), 1995, pp. 991-1009

Abstract

Tensile tests have been carried out on AM3 and CMSX-2 single crystalsin the temperature range from 20 to 1050 degrees C, with three orientations of high symmetry of the tensile axis: [001], [011] and [111]. In order to examine the influence of the size and distribution of the gamma' precipitates, three different thermal treatments were used. The present work focuses on the occurrence of unstable plastic flow and onthe observation of the resulting strain localizations by scanning electron microscopy and transmission electron microscopy. Plastic instabilities are identified as catastrophic slip on octahedral planes inducing the repeated shearing of the gamma' precipitates by mobile dislocations. The influence of thermal treatments on the occurrence of heterogeneous plastic flow is discussed in terms of a competition between theshearing of the gamma' precipitates and their by-passing by an Orowanprocess. The plastic instabilities are interpreted as being due to a difficult dislocation generation step in the gamma matrix, followed byan easy propagation step in an octahedral slip plane.

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Documento generato il 04/12/20 alle ore 22:08:58