Equilibrium point defects in intermetallics with the [ital B]2 structure: NiAl and FeAl

Journal Article · Wed Sep 01 00:00:00 EDT 1993 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.48.6712· OSTI ID:6240760

Fu, C L; Ye, Y; Yoo, M H ^[1]; Ho, K M ^[2]

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1. Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6114 (United States)
2. Ames Laboratory and Department of Physics, Iowa State University, Ames, Iowa 50011 (United States)

Equilibrium point defects and their relation to the contrasting mechanical behavior of NiAl and FeAl are investigated. For NiAl, the defect structure is dominated by two types of defects---monovacancies on the Ni sites and substitutional antisite defects on the Al sites. The defect structure of FeAl differs from that of NiAl in the occurrence of antisite defects at the transition-metal sites for Al-rich alloys and the tendency for vacancy clustering. The strong ordering (and brittleness) of NiAl is attributed mainly to the difference in atomic size between constituent atoms.

• DOE Contract Number: AC05-84OR21400; W-7405-ENG-82
• OSTI ID: 6240760
• Journal Information: Physical Review, B: Condensed Matter; (United States), Vol. 48:9; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM COMPOUNDS
POINT DEFECTS
IRON COMPOUNDS
NICKEL COMPOUNDS
ELECTRONIC STRUCTURE
ENERGY
EQUILIBRIUM
INTERMETALLIC COMPOUNDS
MECHANICAL PROPERTIES
ALLOYS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
TRANSITION ELEMENT COMPOUNDS
360102* - Metals & Alloys- Structure & Phase Studies