Analysis of interfacial dislocations in a single crystal nickel-base superalloy after [001] creep at 1,033 K evolution of internal stresses. [Ni-5. 5Al-2. 2Ti-8. 5Cr-5. 0Co-2. 8Ta-9. 5W-0. 018C]
- Technische Univ. Berlin (Germany). Inst. fuer Metallforschung
Single crystal Nickel-base superalloys are composite consisting of high volume fractions of the ordered L1[sub 2] [gamma][prime] phase embedded in the fcc matrix. Due to the misfit between the two phases, coherency stresses arise in the microstructure. FEM calculations of the principal stress distributions have shown that the narrow matrix channels are highly loaded in compression parallel to the [gamma]/[gamma][prime] interfaces, while tensile stresses perpendicular to the interfaces are small. The interior of the [gamma][prime] cube is under low tensile stress. In the present paper the authors are interested in the evolution of interfacial dislocations at the early stages of creep and at medium temperature where diffusion effects can be neglected. The interfacial dislocations are used for an experimental check of the micromechanical and the crystallographic model.
- OSTI ID:
- 7114931
- Journal Information:
- Scripta Metallurgica et Materialia; (United States), Vol. 30:10; ISSN 0956-716X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ALUMINIUM ALLOYS
DISLOCATIONS
CHROMIUM ALLOYS
COBALT ALLOYS
NICKEL BASE ALLOYS
TANTALUM ALLOYS
TITANIUM ALLOYS
TUNGSTEN ALLOYS
CARBON ADDITIONS
COMPARATIVE EVALUATIONS
EXPERIMENTAL DATA
HEAT RESISTING ALLOYS
TRANSMISSION ELECTRON MICROSCOPY
ALLOYS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DATA
ELECTRON MICROSCOPY
EVALUATION
HEAT RESISTANT MATERIALS
INFORMATION
LINE DEFECTS
MATERIALS
MICROSCOPY
NICKEL ALLOYS
NUMERICAL DATA
360102* - Metals & Alloys- Structure & Phase Studies