Structures of melt-spun and high-energy ball milled Al{sub 3}Ti-Mn-Nb intermetallic alloy
- Shanghai Jiao Tong Univ. (China). Dept. of Materials Science
Because of their low density, relatively high melting point, high elevated temperature strength and excellent oxidation resistance, Al{sub 3}Ti intermetallic is a good candidate to be exploited as the structural material for elevated temperature purpose. In this article, the structures and constituents of a quaternary alloy based on Al{sub 67}Mn{sub 8}Ti{sub 25} with 2 at% Nb addition prepared by melt-spinning and high-energy ball milling have been studied. The authors found that adding certain amounts of Nb into the single phase L1{sub 2}Al{sub 67}Ti{sub 25}Mn{sub 8} alloy can form a new type of Al{sub 3}Ti-based alloy, which has the L1{sub 2} matrix and DO{sub 22}Al{sub 3}(Ti,Nb) second phase in the cast state. Rapid solidification by melt spinning of this alloy is not effective for microstructural control. It is also composed of L1{sub 2} matrix with the DO{sub 22} phase precipitated along the grain boundaries at the free side of the ribbon. In the case of high-energy ball milling, the second phase dissolves into the matrix, accompanying with the disordering of the L1{sub 2} structure. When the milling time reaches 13 h, the structure is completely disordered, forming a FCC solid solution. By further milling to 30 h, the powder is purely amorphous.
- OSTI ID:
- 136953
- Journal Information:
- Scripta Metallurgica et Materialia, Vol. 33, Issue 12; Other Information: PBD: 15 Dec 1995
- Country of Publication:
- United States
- Language:
- English
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