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Microstructure, Creep and Fracture Toughness of Directionally Solidified NiAl/(Cr,Mo) Alloys Modified with Hf, Si, Ta, Ti Additions

Published online by Cambridge University Press:  10 February 2011

I. E. Locci ,
S. V. Raj ,
J. D. Whittenberger ,
J. A. Salem  and
D. J. Keller
I. E. Locci
Affiliation:
Case Western Reserve University at NASA Lewis Research Center, 21000 Brookpark Rd., MS 49–1, Cleveland, Ohio 44135, [email protected]
S. V. Raj
Affiliation:
NASA Lewis Research Center, 21000 Brookpark Rd., MS 49–1, Cleveland, Ohio 44135
J. D. Whittenberger
Affiliation:
NASA Lewis Research Center, 21000 Brookpark Rd., MS 49–1, Cleveland, Ohio 44135
J. A. Salem
Affiliation:
NASA Lewis Research Center, 21000 Brookpark Rd., MS 49–1, Cleveland, Ohio 44135
D. J. Keller
Affiliation:
RealWorld Quality System Inc., Rocky River, Ohio 44116
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Abstract

A statistical design of experiments (DOE) strategy was implemented to optimize alloys based on the Ni-33AI-31Cr-3Mo eutectic system using small amounts of potential strengthening elements (Hf, Si, Ta, Ti). Following the analysis of the DOE results, several alloys were selected for directionally solidification (DS) utilizing a modified Bridgeman technique. The as-grown alloys were microstructurally examined by optical and scanning electron microscopy. They were also evaluated for fracture toughness at room temperature and compressive properties at 1300K. The microstructures and mechanical properties of these DS DOE alloys are discussed and compared to the directionally solidified Ni–33Al–3lCr–3Mo base composition.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 552: Symposium KK – High-Temperature Ordered Intermetallic Alloys VIII , 1998 , KK8.1.1
Copyright
Copyright © Materials Research Society 1999

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References

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