Grain boundary-precipitate interactions in {gamma}{prime} Ni{sub 3}(Al,Ti)
- McMaster Univ., Hamilton, Ontario (Canada). Dept. of Materials Science and Engineering
The authors report here on the evolution of microstructure in ordered Ni{sub 78}Al{sub 18}Ti{sub 4}, cold-worked, then recrystallized, and isothermally treated at 800 C to precipitate the disordered solid solution {gamma}. The first precipitates to appear are small coherent intragranular equiaxed particles, and larger heterogeneously nucleated precipitates on grain boundaries and at triple junctions. With continued aging, the coherent intragranular precipitates grow and become plate like, and the grain boundaries begin to move, dissolving the intragranular particles as they are encountered, and sweeping solute to the incoherent precipitates at the triple junctions. The driving forces for grain boundary motion are considered to be the interfacial energy and the elastic strain energy of the coherent array.
- OSTI ID:
- 99221
- Journal Information:
- Scripta Metallurgica et Materialia, Vol. 33, Issue 1; Other Information: PBD: 1 Jul 1995
- Country of Publication:
- United States
- Language:
- English
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