Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Microstructure and mechanical behavior of the DS Ni-Al-Hf alloy
Autore:
Xing, ZP; Han, YF; Yan, MG;
Indirizzi:
Inst Aeronaut Mat, Beijing 100095, Peoples R China Inst Aeronaut Mat Beijing Peoples R China 100095 100095, Peoples R China
Titolo Testata:
INTERMETALLICS
fascicolo: 5-6, volume: 8, anno: 2000,
pagine: 673 - 677
SICI:
0966-9795(200005/06)8:5-6<673:MAMBOT>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
THERMOELASTIC MARTENSITIC-TRANSFORMATION; FRACTURE-TOUGHNESS; COMPOSITES;
Keywords:
multiphase intermetallics; nickel aluminides, based on NiAl; fracture roughness; crystal growth; microstructure;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
17
Recensione:
Indirizzi per estratti:
Indirizzo: Xing, ZP Inst Aeronaut Mat, Beijing 100095, Peoples R China Inst Aeronaut Mat Beijing Peoples R China 100095 eoples R China
Citazione:
Z.P. Xing et al., "Microstructure and mechanical behavior of the DS Ni-Al-Hf alloy", INTERMETALL, 8(5-6), 2000, pp. 673-677

Abstract

The Ni-30 at% Al-l at% Hf alloy was prepared by a modified Bridgman method. The microstructure and mechanical properties of the alloy were studied. The results show that directional solidification (DS) of the alloy at 4 mm/min resulted in a two-phase (beta + gamma') alloy which consisted of a single crystal beta matrix and gamma' (Ni3Al) reinforcements. Homogenization at 1280 degrees C/6 h followed by air tooling or oil quenching resulted in thebeta-NiAl phases in the alloy mostly transformed to NiAl martensite (M-NiAl). Furthermore, the ambient temperature fracture toughness of the alloy was over 20 MPa root m in as-solidified slate. With the solid solution strengthening of hafnium and second gamma' phase strengthening, the high temperature strength of the alloy was also improved significantly. Annealing at 1280 degrees C for 6 h did not influence obviously the high temperature strength of the alloy, but decreased its ambient fracture toughness significantlywhen the cooling rate was fast enough. The microstructure/mechanical properly relationships were discussed. (C) 2000 Elsevier Science Ltd. All rightsreserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 13/07/20 alle ore 10:36:52