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Two-phase chromium-niobium alloys exhibiting improved mechanical properties at high temperatures

Patent ·
OSTI ID:869139
 [1];  [2]
  1. Oak Ridge, TN
  2. Tokyo, JP
+ Show Author Affiliations

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.

Research Organization:
LOCKHEED MARTIN ENRGY SYST INC
DOE Contract Number:
AC05-84OR21400
Assignee:
Martin Marietta Energy Systems, Inc. ()
Patent Number(s):
US 5282907
OSTI ID:
869139
Country of Publication:
United States
Language:
English

References (2)

Microstructure and mechanical properties of Laves-phase alloys based on Cr2Nb journal February 1991
The constitution of the chromium-niobium-molybdenum system journal February 1961

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1250
18
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aluminum
chromium-niobium
chromium-niobium alloys
compositions
concentration
contain
cr-rich
degree
discloses
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exhibiting improved
improved
improved mechanical
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intermetallic
intermetallic phase
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