Influence of Si content on microstructure of TiAl alloys

Journal Article · Mon Apr 01 00:00:00 EST 1996 · Materials Characterization

DOI:https://doi.org/10.1016/S1044-5803(96)00040-X· OSTI ID:409669

Hsu, F Y; Klaar, H J ^[1]; Wang, G X ^[2]; Dahms, M ^[3]

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1. Aachen Univ. of Technology (Germany). Central Lab. of Electron Microscopy
2. Zhejiang Univ., Hangzhou (China)
3. GKSS Research Center, Geesthacht (Germany)

A systematic study of four ternary TiAl-based alloys with constant Ti content of 52.2 at. % and variable Si content ranging from 0.3 to 2.7 at. % (Al in balance) was conducted. The alloys were prepared from elemental powders via a route including powder mixing, precompaction, cold extrusion, and reactive hot-isostatic pressing. All investigated alloys contain the intermetallic compounds {gamma}-TiAl, {alpha}{sub 2}-Ti{sub 3}Al, and {zeta}-Ti{sub 5}(Si,Al){sub 3}. The microstructure can be described as a duplex structure (i.e., lamella {gamma}/{alpha}{sub 2} regions distributed in a {gamma} matrix) containing {zeta} precipitates. With increasing Si content, the number of primary {zeta} precipitates increased and the {gamma} grain size became finer while the lamellar volume fraction decreased slightly.

• OSTI ID: 409669
• Report Number(s): CONF-9505386-; ISSN 1044-5803; TRN: IM9701%%11
• Journal Information: Materials Characterization, Vol. 36, Issue 4-5; Conference: International metallographic conference (MC 95), Colman (France), 10-12 May 1995; Other Information: PBD: Apr-Jun 1996
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
TITANIUM ALLOYS
MICROSTRUCTURE
ALUMINIUM ALLOYS
SILICON ALLOYS
INTERMETALLIC COMPOUNDS
CHEMICAL COMPOSITION
SAMPLE PREPARATION
POWDERS
COMPACTING
EXTRUSION
HOT PRESSING
PRECIPITATION
GRAIN SIZE
LAMELLAE