Precipitate crystallography and morphology in undercooled, rapidly solidified titanium rare earth alloys
- Vanderbilt Univ., Nashville, TN (United States). Dept. of Applied and Engineering Sciences
In the present experiments on three titanium-rare earth alloys (Ti-1.4 at. % Ce, Ti-1.7 Er and Ti-1.5 La), electromagnetic levitation techniques allowed large bulk liquid undercoolings to be induced prior to rapid solidification via splat quenching. The resulting microstructures are quite different from those found in earlier rapid solidification experiments. As-solidified Ti-Ce and Ti-Er alloys exhibited a distribution of elemental rare earth precipitates within regularly-spaced planar or curved sheets throughout an equiaxed {alpha} Ti matrix. The Ti-La alloy contained randomly distributed metallic lanthanum precipitates within equiaxed {alpha} Ti grains. As in previous studies, annealing treatments resulted in oxidation of the particles. However, annealed precipitates showed different crystal structures than those identified in prior research. This paper describes the unique precipitate morphologies, structures and orientation relationships present in undercooled and rapidly solidified titanium-rare earth alloys.
- Sponsoring Organization:
- National Science Foundation, Washington, DC (United States); National Aeronautics and Space Administration, Washington, DC (United States)
- OSTI ID:
- 417898
- Journal Information:
- Scripta Materialia, Vol. 36, Issue 2; Other Information: PBD: 15 Jan 1997
- Country of Publication:
- United States
- Language:
- English
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