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Titolo:
MICROANALYTICAL STUDY OF THE HEXAGONAL PHASE IN AN YTTRIUM-CONTAININGLOW EXPANSION SUPERALLOY
Autore:
WANG RM; LI CZ; PING DH; YAN MG;
Indirizzi:
INST AERONAUT MAT,POB 81-4 BEIJING 100095 PEOPLES R CHINA CHINESE ACAD SCI,BEIJING LAB ELECTRON MICROSCOPY BEIJING 100080 PEOPLES R CHINA ACAD SINICA,INST MET RES,ATOM IMAGING SOLIDS LAB SHENYANG 110015 PEOPLES R CHINA
Titolo Testata:
Materials science & engineering. A, Structural materials: properties, microstructure and processing
fascicolo: 1-2, volume: 241, anno: 1998,
pagine: 83 - 89
SICI:
0921-5093(1998)241:1-2<83:MSOTHP>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
INCOLOY ALLOY 909;
Keywords:
LOW-EXPANSION SUPERALLOYS; MICROSTRUCTURE; STRESS-ACCELERATED GRAIN BOUNDARY OXYGEN EMBRITTLEMENT;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
11
Recensione:
Indirizzi per estratti:
Citazione:
R.M. Wang et al., "MICROANALYTICAL STUDY OF THE HEXAGONAL PHASE IN AN YTTRIUM-CONTAININGLOW EXPANSION SUPERALLOY", Materials science & engineering. A, Structural materials: properties, microstructure and processing, 241(1-2), 1998, pp. 83-89

Abstract

The resistance to stress-accelerated grain boundary oxygen embrittlement (SAGBO) in Fe-Ni-Co-Nb-Ti controlled low expansion superalloy has been improved by trace yttrium element addition. The platelet precipitates in the alloy have been studied by means of optical microscopy, transmission electron microscopy, convergent beam electron microscopy, high-resolution transmission electron microscopy and X-ray diffraction technique. The crystal structure and the chemical composition of the platelet phase have been determined. The phase has a CaCu5-type crystalstructure (space group P6/mmm) with lattice parameters a = 0.498 nm and c = 0.408 nm. The crystallographic orientation relationship betweenthe phase and the matrix is found to be (<(11)over bar>1)(gamma)/(0001)(H), [(1) over bar 10](gamma)/[11 (2) over bar 0](H). High-resolution images show that the interface between the platelet phase and the matrix is semicoherent and some stacking faults have been found in the platelet phase. (C) 1998 Elsevier Science S.A.

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Documento generato il 14/07/20 alle ore 02:47:35