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High Temperature Resistant Intermetallic Nial-Based Alloys with Refractory Metals Cr, Mo, Re - Structures - Properties - Applications -

Published online by Cambridge University Press:  11 February 2011

G. Frommeyer  and
R. Rablbauer
G. Frommeyer
Affiliation:
Department of Materials Technology, Max-Planck-Institut fuer Eisenforschung, Max-Planck-Str. 1, D-40237 Duesseldorf, Germany
R. Rablbauer
Affiliation:
Department of Materials Technology, Max-Planck-Institut fuer Eisenforschung, Max-Planck-Str. 1, D-40237 Duesseldorf, Germany
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Abstract

The stoichiometric intermetallic compound NiAl with B2 superlattice structure exhibits superior physical and high-temperature mechanical properties, and excellent oxidation resistance. The main disadvantages of polycrystalline NiAl are the lack in plasticity and fracture toughness below the brittle-to-ductile-transition temperature of about 550°C. Insufficient high-temperature strength and creep resistance occur at temperatures above 800°C. Despite these facts NiAl-based alloys are still considered as promising structural materials for high-temperature applications. The refractory metals Cr, Mo, and Re with b.c.c. and h.c.p. lattice structures form with NiAl quasi-binary eutectic systems, showing high melting temperatures and thermally stable microstructures. Elasticity, solid solution hardening, fibre reinforcement, and creep properties were investigated in view of the constitutional defect structure and microstructural features. Especially the fibre reinforced NiAl matrix composites possess optimum high-temperature strength up to 1200 °C, and improved creep resistance as well.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 753: Symposium BB – Defect Properties and Related Phenomena in Intermetallic Alloys , 2002 , BB4.6
Copyright
Copyright © Materials Research Society 2003

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