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Microstructural and Mechanical Evaluation of Near γ-TiAl Alloys Containing Molybdenum and Rhenium

Published online by Cambridge University Press:  01 January 1992

D. B. Snow ,
D. L. Anton ,
M. Y. Nazmy  and
M. Staubli
D. B. Snow
Affiliation:
United Technologies Research Center, 411 Silver Lane, East Hartford, CT 06108, USA
D. L. Anton
Affiliation:
United Technologies Research Center, 411 Silver Lane, East Hartford, CT 06108, USA
M. Y. Nazmy
Affiliation:
ABB Power Generation Ltd., Baden CH-5401, Switerland
M. Staubli
Affiliation:
ABB Power Generation Ltd., Baden CH-5401, Switerland
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Abstract

Near γ-TiAl alloys which incorporated Cr, and Mo or Re additions [Ti-48Al-2Cr-1.5Mo-0.1Y, Ti-48Al-2Cr-1.5Re-0.1Y, and Ti-46Al-2Cr-1.5Re-0.1Y(at.%)], were prepared by arc casting and hot isostatic pressing; then heat treated at 1200 and 900°C to produce a duplex microstructure. All three alloys contained a bimodal size distribution of B2 phase, which was enriched in Cr+Mo or Cr+Re. Very little α2 was present in the 48A1 alloys; whereas the 46A1, 1.5Re alloy contained areas of transformed lamellar α2/γ, within which short lengths of B2 periodically interrupted the α2 plates. The composition of both the equiaxed and lamellar γ in each alloy was 49±0.5A1,1.6±0.4Cr and 蝶 1.2Mo or <lRe(at%). Similarly, the composition of the B2 in the three alloys was experimentally equivalent: 33±1A1, 8.5±2Cr and 6.5±1.5Mo or Re(at%). In the Re containing alloys, the α2 composition was 蝶33A1, 1.7±0.3Cr, and 0.5±0.3Re. Room temperature tensile ductilities were low, ranging from 0.5 to 1%; while ultimate strengths approached 500MPa [7x10-4s-1 strain rate]. Testing at 700°C produced little change in alloy strength, while ductility increased to as much as 2.5%.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 288: Symposium L – High-Temperature Ordered Intermetallic Alloys V , 1992 , 717
Copyright
Copyright © Materials Research Society 1995

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References

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