Fracture morphology of NiAl single crystals tested in tension

Journal Article · Tue Jun 01 04:00:00 EDT 1993 · Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States)

DOI:https://doi.org/10.1007/BF02668204· OSTI ID:6136522

Schneibel, J H ^[1]; Darolia, R; Lahrman, D F ^[2]; Schmauder, S ^[3]

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1. Oak Ridge National Lab., TN (United States)
2. GE Aircraft Engines, Cincinnati, OH (United States)
3. Max-Planck-Institut fuer Metallforschung, Stuttgart (Germany)

The fracture surfaces of NiAl single crystals, strained to fracture in uniaxial tension at room temperature, were analyzed by scanning electron microscopy (SEM). Contrary to several previous reports, no preference for [011] cleavage was found. Occasionally, fracture facets close to [115] and [117] planes were observed. For the <011> orientation, fracture tended to occur at a 45 deg angle to the tensile axis (i.e., in the direction of maximum shear stress). In the case of the <111> orientation, fracture facets exhibited similar angles but were, at the same time, close to [011] planes. In a <001> specimen, the fracture surface normals tended to include an angle close to 35 deg with the tensile axis. This suggests that the tensile fracture of <001> crystals could be associated with <111>[112] slip.

• DOE Contract Number: AC05-84OR21400
• OSTI ID: 6136522
• Journal Information: Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States), Journal Name: Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States) Vol. 24A:6; ISSN 0360-2133; ISSN MTTABN
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102 -- Metals &amp; Alloys-- Structure &amp; Phase Studies
360103* -- Metals &amp; Alloys-- Mechanical Properties
ALLOYS
ALUMINIUM ALLOYS
BCC LATTICES
CLEAVAGE
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CUBIC LATTICES
DATA
ELECTRON MICROSCOPY
EXPERIMENTAL DATA
FRACTURE PROPERTIES
GRAIN BOUNDARIES
INFORMATION
INTERMETALLIC COMPOUNDS
MECHANICAL PROPERTIES
MICROSCOPY
MICROSTRUCTURE
NICKEL ALLOYS
NUMERICAL DATA
ORIENTATION
SCANNING ELECTRON MICROSCOPY