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Titolo:
Precipitations in an yttrium-containing low-expansion superalloy
Autore:
Wang, RM; Han, YF; Li, CZ; Zhang, SW; Ping, DH; Yan, MG;
Indirizzi:
Inst Aeronaut Mat, Beijing 100095, Peoples R China Inst Aeronaut Mat Beijing Peoples R China 100095 100095, Peoples R China AcadsSinica, Inst Met Res, Atom Imaging Solids Lab, Shenyang 110015, People Acad Sinica Shenyang Peoples R China 110015 Lab, Shenyang 110015, People ChineseRAcad Sci, Beijing Lab Electron Microscopy, Beijing 100080, PeoplesChinese Acad Sci Beijing Peoples R China 100080 Beijing 100080, Peoples
Titolo Testata:
JOURNAL OF MATERIALS SCIENCE
fascicolo: 20, volume: 33, anno: 1998,
pagine: 5069 - 5077
SICI:
0022-2461(19981015)33:20<5069:PIAYLS>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
ALLOY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
--discip_EC--
Citazioni:
13
Recensione:
Indirizzi per estratti:
Indirizzo: Wang, RM Inst Aeronaut Mat, Beijing 100095, Peoples R China Inst Aeronaut Mat Beijing Peoples R China 100095 eoples R China
Citazione:
R.M. Wang et al., "Precipitations in an yttrium-containing low-expansion superalloy", J MATER SCI, 33(20), 1998, pp. 5069-5077

Abstract

The resistance to stress-accelerated grain-boundary oxygen embrittlement and notch-bar rupture strength in Fe-Ni-Co-Nb-Ti low-expansion superalloy has been improved significantly by trace yttrium addition. The precipitates in the matrix as well as along the grain boundaries have been studied systematically. The platelet precipitates in the matrix and along the grain boundaries have a hexagonal crystal structure (space group, P6/mmm) with latticeparameters a = 0.498 nm and c = 0.408 nm. The crystallographic orientationrelationship between the phase and the matrix is found to be ((1) over bar(1) over bar 1)(gamma) //(0 0 0 1)(H), [(1) over bar 1 0](gamma)//[1 1 (2)over bar 0](H). The semi-continuous discrete precipitates along the grain boundaries have an orthorhombic crystal structure with lattice parameters a= 0.45 nm, b = 0.80 nm and c = 1.20 nm. High-resolution images show that the interface between the precipitates and the matrix is semicoherent. (C) 1998 Kluwer Academic Publishers.

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Documento generato il 07/08/20 alle ore 21:12:29