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Titolo:
Local order in industrial and model gamma phases of superalloys
Autore:
Pettinari, F; Prem, M; Krexner, G; Caron, P; Coujou, A; Kirchner, HOK; Clement, N;
Indirizzi:
CEMES, F-31055 Toulouse 4, France CEMES Toulouse France 4CEMES, F-31055 Toulouse 4, France CEA Saclay, CNRS, Leon Brillouin Lab, F-91191 Gif Sur Yvette, France CEA Saclay Gif Sur Yvette France F-91191 F-91191 Gif Sur Yvette, France Univ Vienna, Inst Expt Phys, A-1090 Vienna, Austria Univ Vienna Vienna Austria A-1090 Inst Expt Phys, A-1090 Vienna, Austria Off Natl Etud & Rech Aerosp, F-92322 Chatillon, France Off Natl Etud & Rech Aerosp Chatillon France F-92322 2 Chatillon, France Univ Paris 11, Inst Mat Sci, F-91405 Orsay, France Univ Paris 11 Orsay France F-91405 , Inst Mat Sci, F-91405 Orsay, France
Titolo Testata:
ACTA MATERIALIA
fascicolo: 13, volume: 49, anno: 2001,
pagine: 2549 - 2556
SICI:
1359-6454(20010801)49:13<2549:LOIIAM>2.0.ZU;2-E
Fonte:
ISI
Lingua:
ENG
Soggetto:
SHORT-RANGE ORDER; NICKEL-BASE SUPERALLOY; AT-PERCENT CR; DIFFUSE-SCATTERING; NEUTRON-SCATTERING; FRICTION STRESSES; NI-MO; ALLOYS; SLIP;
Keywords:
neutron scattering; transmission electron microscopy (TEM); superalloys; dislocations mobility; order-disorder phenomena;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
18
Recensione:
Indirizzi per estratti:
Indirizzo: Clement, N CEMES, 29 Rue J Marvig,BP 4347, F-31055 Toulouse 4, France CEMES 29 Rue J Marvig,BP 4347 Toulouse France 4 ouse 4, France
Citazione:
F. Pettinari et al., "Local order in industrial and model gamma phases of superalloys", ACT MATER, 49(13), 2001, pp. 2549-2556

Abstract

Different gamma phase model alloys of nickel base superalloys are investigated as a function of temperature using elastic diffuse neutron scattering,macroscopic tensile tests, TEM post mortem observations and in situ straining experiments. Short Range Order (SRO) of (1 1/2 0) type resulting from nano-domains with correlation lengths of 0.5-1 nm is observed in all alloys. The dislocation distribution confirms the presence of short-range ordered nano-domains with a size of about 0.7 nm. In all the alloys, the influence of SRO on the deformation mechanisms is clear at low and medium temperatureand thus explains the similarities of the deformation behaviour observed in this temperature range. From 750 degreesC to 1000 degreesC, the deformation microstructure becomes progressively homogeneous which suggests the decrease of SRO as illustrated by a decrease of diffuse scattering intensities at the (1 1/2 0) positions on heating. The various techniques applied proveto be complementary in the investigation of complex solid solutions. (C) 2001 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.

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Documento generato il 02/12/20 alle ore 17:36:56