Heavy ion induced damage and disorder in intermetallic compounds with the B2 structure. [NiAl; NiTi; FeAl]

Conference · Thu Nov 01 04:00:00 EST 1984

OSTI ID:5274191

Brimhall, J L; Kissinger, H E

Although the B2-type intermetallic compounds, NiAl, FeAl, NiTi and FeTi all maintained a high degree of order during irradiation, metastable phase formation was observed. Dislocation loops and network developed in NiAl and FeAl during irradiation and a nickel rich, fcc phase, most likely disordered Ni/sub 3/Al, formed in NiAl after high doses. The build-up of constitutional vacancies (excess vacancies on Ni sites) and subsequent elemental partitioning of Ni and Al can explain the formation of a nickel rich phase in NiAl. No metastable phases formed in FeAl. Dislocation loop structures did not develop in NiTi or FeTi, rather a transformation to an amorphous phase occurred at relatively low doses. The amorphous transformation results when the free energy of the crystal lattice containing a high defect concentration exceeds the free energy of the amorphous configuration.

• Research Organization: Pacific Northwest Labs., Richland, WA (USA)
• DOE Contract Number: AC06-76RL01830
• OSTI ID: 5274191
• Report Number(s): PNL-SA-12388; CONF-8411198-1; ON: DE850068815
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360106* -- Metals & Alloys-- Radiation Effects
ALLOYS
ALUMINIUM ALLOYS
AMORPHOUS STATE
BEAMS
CHARGED PARTICLES
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DISLOCATIONS
ENERGY RANGE
INTERMETALLIC COMPOUNDS
ION BEAMS
IONS
IRON ALLOYS
LINE DEFECTS
MEV RANGE
MEV RANGE 01-10
MICROSTRUCTURE
NICKEL ALLOYS
NICKEL IONS
PHASE TRANSFORMATIONS
PHYSICAL RADIATION EFFECTS
RADIATION EFFECTS
TITANIUM ALLOYS