Mechanisms and kinetics of ion beam-induced compositional modifications
Conference
·
OSTI ID:5418582
Near-surface compositional modification of ion-bombarded alloys results from the dynamic interplay of several atomistic processes. In addition to displacement mixing leading to a randomization of atomic locations, which is dominant at relatively low temperatures, and preferential loss of alloying elements by sputtering, many thermally-activated processes, including radiation-enhanced diffusion, radiation-induced segregation and Gibbsian adsorption, also play important roles. The relative contributions of these processes to the evolution of the target composition profile depends on the target materials and irradiation variables. Although a good understanding of the individual processes has been achieved, information regarding their synergistic effects on alloy surface modification is still limited. In this article, these processes are characterized in simple physical terms, and the present understanding of their relative significance and contributions in changing the target composition during ion bombardment are discussed in view of recent progress in theoretical modeling and experimental study. 42 refs., 8 figs.
- Research Organization:
- Argonne National Lab., IL (USA)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 5418582
- Report Number(s):
- CONF-8711126-2; ON: DE88005998
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360102 -- Metals & Alloys-- Structure & Phase Studies
360106* -- Metals & Alloys-- Radiation Effects
656003 -- Condensed Matter Physics-- Interactions between Beams & Condensed Matter-- (1987-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALLOYS
ATOMS
BEAMS
CHARGED PARTICLES
CRYSTAL DEFECTS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DIFFUSION
ION BEAMS
IONS
LAYERS
NEON IONS
NICKEL ALLOYS
NICKEL BASE ALLOYS
PHASE TRANSFORMATIONS
PHYSICAL RADIATION EFFECTS
POINT DEFECTS
RADIATION EFFECTS
SEGREGATION
SILICON ALLOYS
SPUTTERING
SURFACE TREATMENTS
SURFACES
TEMPERATURE EFFECTS
VACANCIES
360102 -- Metals & Alloys-- Structure & Phase Studies
360106* -- Metals & Alloys-- Radiation Effects
656003 -- Condensed Matter Physics-- Interactions between Beams & Condensed Matter-- (1987-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALLOYS
ATOMS
BEAMS
CHARGED PARTICLES
CRYSTAL DEFECTS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DIFFUSION
ION BEAMS
IONS
LAYERS
NEON IONS
NICKEL ALLOYS
NICKEL BASE ALLOYS
PHASE TRANSFORMATIONS
PHYSICAL RADIATION EFFECTS
POINT DEFECTS
RADIATION EFFECTS
SEGREGATION
SILICON ALLOYS
SPUTTERING
SURFACE TREATMENTS
SURFACES
TEMPERATURE EFFECTS
VACANCIES