The effect of impurity content on thermally activated deformation in NiAl single crystals
- Carnegie Mellon Univ., Pittsburgh, PA (United States). Dept. of Materials Science and Engineering
- National Aeronautics Space Agency, Cleveland, OH (United States). Lewis Research Center
NiAl-base materials are attractive candidates for high temperature structural applications due to their low density, excellent oxidation resistance and high thermal conductivity. However, in single crystal and polycrystalline form, NiAl suffers from low tensile ductility and toughness. The mechanisms responsible for the limited ductility of NiAl single crystals are still in question. For this reason, thermally activated deformation in NiAl single crystals has been studied with the use of strain-rate change experiments. The preliminary results suggest that the intrinsic mobility of a <111>, and to a lesser extent a <100> dislocations, is limited below the DBTT in NiAl. To examine the influence of interstitial impurities and the possibility that strain-aging embrittlement is the mechanism responsible for the limited ductility of NiAl, further experiments on high purity NiAl crystals have been conducted for comparison to the results on commercial purity crystals.
- OSTI ID:
- 6983339
- Journal Information:
- Scripta Metallurgica et Materialia; (United States), Vol. 31:4; ISSN 0956-716X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ALUMINIUM ALLOYS
DEFORMATION
DUCTILITY
NICKEL ALLOYS
COMPARATIVE EVALUATIONS
DUCTILE-BRITTLE TRANSITIONS
EXPERIMENTAL DATA
HEAT RESISTING ALLOYS
INTERMETALLIC COMPOUNDS
MONOCRYSTALS
ALLOYS
CRYSTALS
DATA
EVALUATION
HEAT RESISTANT MATERIALS
INFORMATION
MATERIALS
MECHANICAL PROPERTIES
NUMERICAL DATA
TENSILE PROPERTIES
360103* - Metals & Alloys- Mechanical Properties