Evolution of the microstructure during hot working of gamma-based TiAl alloys

Citation
U. Brossmann et al., Evolution of the microstructure during hot working of gamma-based TiAl alloys, Z METALLKUN, 92(8), 2001, pp. 1009-1014
Citations number
21
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science",Metallurgy
Journal title
ZEITSCHRIFT FUR METALLKUNDE
ISSN journal
0044-3093 → ACNP
Volume
92
Issue
8
Year of publication
2001
Pages
1009 - 1014
Database
ISI
SICI code
0044-3093(200108)92:8<1009:EOTMDH>2.0.ZU;2-B
Abstract
Cast products of two-phase titanium aluminides suffer from microsegregation of the alloying elements, which arises from the peritectic solidification pathway. The resulting variation in composition and microstructure occurs o n a length scale in the range of I min and, thus, cannot be tolerated for t he anticipated applications of the materials. A significant structural and chemical consolidation can be achieved by homogenization and hot-working pr ocedures, however, the processing experience is limited. This problem is ad dressed in the present paper in that the evolution of the microstructure of two-phase alloys after different stages of wrought processing is character ized by structural and chemical microanalysis involving scanning electron m icroscopy and energy dispersive X-ray analysis. The investigations involve different two-phase alloys in order to assess the effects of ternary and hi gher alloying elements on the finally obtained microstructure.