The effect of aluminium on the formation of orthorhombic plates in the Nb-Ti-Al ternary system
- Alfred Univ., NY (United States)
- Univ. of Florida, Gainesville, FL (United States). Dept. of Materials Science and Engineering
Transmission electron microscopy (TEM) was used to study the phase transformation in an alloy containing 33Ti-27Nb-40Al (at.%). The results showed that the BCC {beta} phase was present at high temperatures, which ordered to the B 2 phase, and finally was martensitically transformed to a plate microstructure during quenching. The plates possessed an orthorhombic crystal structure and a substructure that consisted of both coarse and fine anti-phase domain boundaries (APDBs). These APDBs were consistent with three sublattices that were derived from the inherited site occupancy of the B2 matrix and a subsequent disorder to order transition. The CBED analysis of the plates showed that the site occupancy of this orthorhombic phase was consistent with the Al{sub 2}NbTi stoichiometry with Al occupying the 8g, Nb the 4cl, and Ti the 4c2 Wyckoff sites.
- Sponsoring Organization:
- Advanced Research Projects Agency, Washington, DC (United States)
- OSTI ID:
- 571713
- Report Number(s):
- CONF-961202--
- Country of Publication:
- United States
- Language:
- English
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Journal of Research of the National Institute of Standards and Technology, September-October 1993. Volume 98, Number 5
Part 1: The microstructural evolution in Ti-Al-Nb O + bcc orthorhombic alloys