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Microstructure and strength of binary and tantalum alloyed two-phase Nbss/Nb3Al base alloys

✍ Scribed by R. Gnanamoorthy; S. Hanada

Publisher
Elsevier Science
Year
1996
Tongue
English
Weight
890 KB
Volume
207
Category
Article
ISSN
0921-5093

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✦ Synopsis

Niobium aluminide (Nb,Al) base intermetallic compounds are potential candidates for applications at temperatures above the operating temperatures of currently used superalloys, provided their low-temperature ductility and fracture toughness and high-temperature oxidation resistance arr: improved. Two-phase (Nb,,/Nb,Al) materials with different volume fractions depending on the aluminium content were prepared by ingot metallurgy followed by isothermal forging and heat treatment. The addition of tantalum (about 10 mol%) has no influence on the phase content, volume fraction and grain size. The compressive strength of both the binary and ternary alloys investigated depends strongly on the aluminium content. Increasing the volume fraction of Nb,, phase decreases the strength at all temperatures tested. The addition of tantalum improves the high-temperature strength of Nb,,/Nb,Al alloys.

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