Zr bearing gamma-TiAl induction melted

• Type: Article in International Scientific Journal
• Date: 2000

Authors

J. Barbosa (Author) Other; A. Duarte (Author) Other; Carlos Silva Ribeiro (Author) FEUP; Filomena Viana (Author) FEUP; C. Monteiro (Author) Other

Journal

Title: Key Engineering Materials

Vol. 188

Pages: 45-54

ISSN: 1013-9826

Publisher: Trans Tech Publications Ltd

Indexing

ISI Web of Knowledge - 4 Citations

Scopus - 5 Citations

Scientific classification

FOS: Engineering and technology > Materials engineering

Other information

Authenticus ID: P-001-1CC

DOI: 10.4028/www.scientific.net/KEM.188.45

Abstract (EN): This paper describes the processing results of TiAl alloys melted under argon atmosphere by induction melting, using crucibles made of calcia and stabilized zirconia. Castings were allowed to solidify inside the crucible, in order to simulate the worst situation using this processing. Segregation profiles of residual elements and microhardness of different phases were evaluated, as well as its relation with the "alpha-case" extension. Two TiAl alloys, with 1 at. % zirconium and zirconium free, were produced and heat treated aiming to replace their as-cast structure by a quasi-lamellar one. The respective zirconium partition amongst microconstituents was evaluated, being demonstrated that zirconium concentrates in the gamma -phase and increases the volume fraction of this constituent, showing the gamma stabiliser role of zirconium.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 10