Skip to main content
OSTI.GOVU.S. Department of Energy Office of Scientific and Technical Information
U.S. Department of Energy
Office of Scientific and Technical Information
 

THE EQUILIBRIUM PHASE DIAGRAM, NIOBIUM-ALUMINUM. Final Report

Technical Report ·
OSTI ID:4727163
;
The binary equilibrium phase diagram of niobiumaluminum alloys was studied by metallographic, x-ray diffraction, hardness, and thermal analysis techniques. Auxiliary equilibria data were obtained by hardness and incipient- melting techniques. Metallographic studies were conducted on both as-cast and annealed-and-quenched alloys. Three intermediate phases were established; Nb/sub 3/Al, Nb/sub 2/Al, and NbAl/sub 3/. The Nb/sub 3/Al and Nb/sub 2/Al phases both have ranges of solid solubility. The Nb/sub 3/Al and Nb/sub 2/Al intermediate phases are formed peritectically at 1960 450 deg C in a 10 un. Concent 85% C and 1870 450 deg C in a 10 un. Concent 85% C, respectively, whereas the NbAl/ sub 3/ phase forms congruently from the melt at 1605 450 deg C in a 10 un. Concent 85% C. Structural and lattice parameter data for the intermediate phases were determined by x-ray diffraction. The maximum solid solubility of Al in Nb is 23.0 450 deg C in a 0.5 at. % (8.0 wt %)Al at 1960 450 deg C in a 10 un. Concent 85% C. A eutectic reaction occurs at 57.8 450 deg C in a 0.5 at. % (28.5 wt %)Al and 1550 450 deg C in a 10 un. Concent 85% C between Nb/sub 2/Al and NbAl/sub 3/. The Al-rich end of the diagram has a peritectic reaction at 661.4 450 deg C in a 0.5 un. Concent 85% C within less than 1 wt% Nb. The maximum solid solubility of Nb in Al is less than 0.3 450 deg C in a 0.1 at. % (1.0 wt %)Nb. (auth)
Research Organization:
Denver. Univ. Denver Research Inst.
NSA Number:
NSA-17-022161
OSTI ID:
4727163
Report Number(s):
DRI-2096
Country of Publication:
United States
Language:
English

Similar Records

CONSTITUTION DIAGRAM AND PROPERTIES OF NIOBIUM-ALUMINUM ALLOYS
Journal Article · Sat Dec 31 23:00:00 EST 1960 · Zhur. Neorg. Khim. · OSTI ID:4050666
CONSTITUTION DIAGRAM OF In-Se ALLOYS
Journal Article · Mon Dec 31 23:00:00 EST 1962 · Zh. Neorgan. Khim. · OSTI ID:4727093
METAL-METAL HALIDE SYSTEMS OF GADOLINIUM AND YTTRIUM
Thesis/Dissertation · Sun Dec 31 23:00:00 EST 1961 · OSTI ID:4727091

Related Subjects

ALUMINUM ALLOYS
ANNEALING
CASTING
DIFFRACTION
DTA
EUTECTICS
EXPANSION
HARDNESS
HEAT TREATMENTS
INTERMETALLIC COMPOUNDS
LATTICES
MELTING
METALLOGRAPHY
METALS, CERAMICS, AND OTHER MATERIALS
NIOBIUM ALLOYS
PHASE DIAGRAMS
QUENCHING
REPORT
SOLID SOLUTIONS
STANDARDS
TEMPERATURE
X RADIATION