Changes of structure and phase composition of Ni3Al intermetallic compounddue to surrounding atmosphere at elevated temperatures

Authors
Pizurova, N Schneeweiss, O
Citation
N. Pizurova et O. Schneeweiss, Changes of structure and phase composition of Ni3Al intermetallic compounddue to surrounding atmosphere at elevated temperatures, KOVOVE MAT, 39(2), 2001, pp. 121-131
Citations number
11
Categorie Soggetti
Material Science & Engineering
Journal title
KOVOVE MATERIALY-METALLIC MATERIALS
ISSN journal
0023432X → ACNP
Volume
39
Issue
2
Year of publication
2001
Pages
121 - 131
Database
ISI
SICI code
0023-432X(2001)39:2<121:COSAPC>2.0.ZU;2-N
Abstract
Structural and phase composition of the Ni3Al intermetallic compound sample s are investigated using electrical resistance measurement during a long ti me annealing at 773 degreesC in argon atmosphere. The initial and final sta te is studied by SEM, TEM and EDAX. Isothermal measurement of electrical re sistance during tile annealing indicates two stages of oxide formation. Exc hange of the argon atmosphere for the hydrogen one causes a jump of electri cal resistance explained by interaction of the oxide with hydrogen. Study o f the structure shows that two types of Al2O3 are formed: hexagonal beta -A l2O3 and trigonal delta -Al2O3.