Effect of simultaneous heavy-ion and electron bombardment on the amorphization kinetics of intermetallics

Journal Article · Thu Sep 01 04:00:00 EDT 1988 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.38.4803· OSTI ID:6801695

Pedraza, D F

A theory of amorphization of ordered intermetallic compounds is applied to the case of simultaneous irradiation by electrons and heavy ions. The theory proposes that the local buildup of radiation-induced defects (interstitial-vacancy complexes) to a critical value destabilizes the crystalline lattice in a small region, causing it to become amorphous. The rate of increase of the complex concentration results from a balance between complex formation (with an athermal component under ion bombardment) and complex annihilation by thermally activated processes. This mechanism explains, in the case of electron irradiation, the existence of a cutoff temperature, T/sub e//sup c/, above which no crystalline-to-amorphous transition occurs due to insufficient complex buildup. In the case of ion bombardment, a cutoff temperature, T/sub i//sup c/, is also obtained, above which no significant complex accumulation takes place, but T/sub i//sup c/ is higher than T/sub e//sup c/. It is shown that simultaneous bombardment with ions and electrons leads to an acceleration of the transition up to temperatures around T/sub e//sup c/ and to a progressive delay and possible suppression of the transition at increasing irradiation temperatures between T/sub e//sup c/ and T/sub i//sup c/. .AE

• Research Organization: Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6376
• OSTI ID: 6801695
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 38:7; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOYS
AMORPHOUS STATE
CHARGED PARTICLES
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
CRYSTAL-PHASE TRANSFORMATIONS
ELECTRONS
ELEMENTARY PARTICLES
FERMIONS
INTERMETALLIC COMPOUNDS
IONS
IRRADIATION
LEPTONS
MIGRATION
PHASE TRANSFORMATIONS
POINT DEFECTS
PRODUCTION MECHANISMS
TEMPERATURE EFFECTS