Two-phase chromium-niobium alloys exhibiting improved mechanical

Details Two-phase chromium-niobium alloys exhibiting improved mechanical Two-phase chromium-niobium alloys exhibiting improved mechanical

1992-07-16

1994-02-01

Roy, Upendra

Metal treatment

Stock

Chromium, molybdenum, or tungsten base

420428, C22C 2700

Patent

active

052829073

ABSTRACT:
The specification discloses chromium-niobium alloys which exhibit improved mechanical properties at high temperatures in the range of 1250.degree. C. and improved room temperature ductility. The alloys contain a Cr.sub.2 Nb-rich intermetallic phase and a Cr-rich phase with an overall niobium concentration in the range of from about 5 to about 18 at. %. The high temperature strength is substantially greater than that of state of the art nickel-based superalloys for enhanced high temperature service. Further improvements in the properties of the compositions are obtained by alloying with rhenium and aluminum; and additional rare-earth and other elements.

REFERENCES:
patent: 3008854 (1961-11-01), Grant et al.
J. Less-Common Metals, 3 (1961) 44.
Microstructure and mechanical properties of Laves-phase alloys based on Cr.sub.2 Nb M. Takeyama and C. T. Liu, Materials Science and Engineering, A132 (1991) 61-66.

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