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Properties of Reactively Synthesized Titanium Aluminides

Published online by Cambridge University Press:  22 February 2011

D. E. Alman ,
J. A. Hawk  and
R. D. Wilson
D. E. Alman
Affiliation:
U.S. Bureau of Mines, Albany Research Center, Albany, OR 97321
J. A. Hawk
Affiliation:
U.S. Bureau of Mines, Albany Research Center, Albany, OR 97321
R. D. Wilson
Affiliation:
U.S. Bureau of Mines, Albany Research Center, Albany, OR 97321
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Abstract

Reactive synthesis directly forms compounds from their elemental constituents. In this U.S. Bureau of Mines study the microstructure, hot-hardness and tensile properties of alloys and composites based on TiAl and Ti2AlNb were studied. Ti2AlNb sheets were processed from elemental Ti, Al and Nb foils. The elemental foils were consumed during processing, leaving a microstructure consisting of three phases: O (orthorhombic Ti2AlNb), B2 (ordered cubic Ti), and α2 (Ti3Al). The composite sheet structures were heat-treated to produce a microstructure consisting of O lathes in a B2 matrix. A significant advantage of reactive synthesis is the ease of formation of complex shapes prior to synthesis of the aluminide. TiAl-based alloys and in situ TiAl/boride and TiAl/Ti5Si3 composites were produced from elemental mixtures of Ti and Al with either additions of B or Si powders. The hot-hardness and tensile properties of these alloys and composites are reported. The Kirkendall porosity associated with reactive sintering of TiAl can be eliminated by simultaneously reactive sintering TiAl and Ti5Si3.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 364: Symposium L – High-Temperature Ordered Intermetallic Alloys–VI , 1994 , 805
Copyright
Copyright © Materials Research Society 1995

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