Mechanisms of the electron irradiation-induced amorphous transition in intermetallic compounds

Journal Article · Thu May 01 04:00:00 EDT 1986 · J. Mat. Res.; (United States)

DOI:https://doi.org/10.1557/JMR.1986.0425· OSTI ID:5602027

Pedraza, D F

A buildup of radiation-induced lattice defects is proposed as the cause for lattice instability that can give rise to a crystalline-to-amorphous transition. An analysis of published experiments on intermetallic compounds suggests that, when amorphization takes place, no microstructural evolution based on the aggregation of like-point defects occurs. This observation leads us to suggest that buildup of a different type of defect, which will destabilize the crystal, should occur. We thus propose that an interstitial and a vacancy may form a complex, giving rise to a relaxed configuration exhibiting a sort of short-range order. Two mechanisms of complex formation are analyzed, one diffusionless (limited by the point defect production rate) and the other temperature dependent. The amorphization kinetics as a function of temperature, dose, and point defect sink strength are studied. Theoretical predictions on the amorphization dose as a function of temperature are made for the equiatomic TiNi alloy and compared with available experimental results.

• Research Organization: Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 5602027
• Journal Information: J. Mat. Res.; (United States), Journal Name: J. Mat. Res.; (United States) Vol. 1:3; ISSN JMREE
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360106* -- Metals & Alloys-- Radiation Effects
ALLOYS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
ELECTRONS
ELEMENTARY PARTICLES
FERMIONS
INTERMETALLIC COMPOUNDS
INTERSTITIALS
LEPTONS
MICROSTRUCTURE
NICKEL ALLOYS
PHYSICAL RADIATION EFFECTS
POINT DEFECTS
RADIATION EFFECTS
TEMPERATURE DEPENDENCE
TITANIUM ALLOYS
VACANCIES