{gamma} + {alpha}{sub 2} + B2 lamellar domains in rolled TiAl

Journal Article · Thu Apr 02 23:00:00 EST 1998 · Scripta Materialia

DOI:https://doi.org/10.1016/S1359-6462(98)00058-X· OSTI ID:619489

Inkson, B J; Marien, J ^[1]; Clemens, H ^[2]

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1. Max-Planck-Inst. fuer Metallforschung, Stuttgart (Germany)
2. Plansee Aktiengesellschaft, Reutte (Austria)

The structure of {gamma} + {alpha}{sub 2} B2 lamellar domains have been examined in rolled TiAl containing B2-phase stabilized by Cr and Mo. Directly after rolling and rapid cooling the lamellar regions consist only of non-equilibrium {gamma} and {alpha}{sub 2}. Annealing at 1,000 C initiates both a {alpha}{sub 2} {yields} B2 solid state decomposition and {gamma}-lamellae coarsening. The resulting {gamma} + {alpha}{sub 2} + B2 lamellar domains consist of composite {alpha}{sub 2} + B2 laths lying between {gamma}-lamellae. The B2 grains precipitate with the orientation relationship (0002){sub {alpha}2}{parallel}{l_brace}110{r_brace}{sub B2} and <11-20>{sub {alpha}2}{parallel}<111>{sub B2}, having semi-coherent interfaces with both the parent {alpha}{sub 2} and the adjacent {gamma}-grains. A given {alpha}{sub 2} lamella may decompose to one or more of the six possible orientations of B2 phase resulting from this transformation.

• OSTI ID: 619489
• Journal Information: Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 9 Vol. 38; ISSN 1359-6462; ISSN SCMAF7
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
CHROMIUM ALLOYS
GRAIN ORIENTATION
INTERMETALLIC COMPOUNDS
METALLURGICAL EFFECTS
MICROSTRUCTURE
MOLYBDENUM ALLOYS
TITANIUM ALLOYS