The microstructure of Nb{sub 3}Al-Mo intermetallics
- Univ. of Surrey, Guildford (United Kingdom). Dept. of Materials Science and Engineering
The microstructure of arc melted ingots and melt-spun ribbons of Nb-18Al, Nb-18Al-(20-40) Mo (at%) were studied. Rapid quenching from the melt refined the grain size by at least two orders of magnitude. In the binary alloy ingots and ribbons the Nb{sub 3}Al (A15) and B2 phases were present. Molybdenum exhibited complete solid solubility in the bcc Nb-Al solid solution as well as in the Nb{sub 3}Al (A15 phase). The former was the only phase present in the ribbons of the ternary alloys, while Nb{sub 3}Al was detected only in the ingots. B2 phase was formed in the alloy with 20 at% Mo and the A2 phase was present in the alloy with 40 at% Mo. Furthermore, Mo addition increased the room temperature microhardness of the Nb-Al solid solution by {approx}7 Kgmm{sup {minus}2}/at%Mo.
- OSTI ID:
- 72558
- Report Number(s):
- CONF-941144--; ISBN 1-55899-265-0
- Country of Publication:
- United States
- Language:
- English
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