Cr{sub 2}Nb-based alloy development
- Oak Ridge National Lab., TN (United States); and others
Alloys of Cr-Cr{sub 2}Nb with exceptionally high strength at 1200{degrees}C have been developed. However, these compositions suffer from limited ductility and toughness at room temperature. Despite improvements from processing modifications, as-fabricated defects still limit room temperature mechanical behavior. In contrast, an alloy system with only a small mismatch of the coefficients of thermal expansion of the two phases, Cr-Cr{sub 2}Zr, showed good fabricability. However, these alloys are weaker than Cr-Cr{sub 2}Nb compositions at high temperatures and have poor oxidation resistance. Silicide coatings can provide high-temperature oxidation and sulfidation protection of these alloys. Improvements in room temperature mechanical properties of Laves-phase-strengthened alloys will rely on further development based on increasing the ductility of the matrix phase by impurity control and compositional modifications.
- Research Organization:
- Oak Ridge National Lab., TN (United States)
- DOE Contract Number:
- AC05-96OR22464
- OSTI ID:
- 458967
- Report Number(s):
- ORNL/FMP--96/1; CONF-9605167--; ON: DE97050349
- Country of Publication:
- United States
- Language:
- English
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