Thermal annealing of solid Kr precipitates in Ni

Conference · Wed Nov 01 00:00:00 EST 1989

DOI:https://doi.org/10.1557/PROC-157-277· OSTI ID:5182435

Birtcher, R C; Rest, J; Bergstrom, D S

After implantation into Ni at room temperature, Kr condenses under high pressure as an fcc solid aligned with the Ni lattice. Evolution of these precipitates during subsequent thermal annealing to a temperature of 650 C has been followed with transmission electron microscopy and modeled with rate theory. Room temperature implantation results in a monomodal size distribution of small solid Kr precipitates. When Kr is implanted into Ni at 500 C, some precipitates grow to larger sizes, and the precipitate size distribution becomes bimodal. Annealing to temperatures below 600 C after room temperature implantation produces a bimodal size distribution consisting of small solid Kr precipitates and large Kr bubbles. Annealing above 600 C leads to more complete precipitate motion and coalescence that eliminates all small precipitates and results in a monomodal size distribution of large faceted bubbles. Rate-theory modelling of Kr implantation into Ni at 500 C suggests that small solid Kr precipitates are immobile and that Kr melting is required for precipitate mobility. Similar calculations for thermal annealing experiments show that the bubble size distribution becomes bimodal when only a small fraction of the small precipitates melt and become mobile during annealing, while the size distribution remains monomodal when all precipitates become mobile after Kr melting at higher temperatures. 12 refs., 3 figs.

• Research Organization: Argonne National Lab. (ANL), Argonne, IL (United States)
• Sponsoring Organization: DOE/ER
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 5182435
• Report Number(s): CONF-891119-57; ON: DE90004885
• Resource Relation: Journal Volume: 157; Conference: Materials Research Society fall meeting, Boston, MA (USA), 27 Nov - 2 Dec 1989
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
KRYPTON
PRECIPITATION
KRYPTON IONS
ION IMPLANTATION
NICKEL
ANNEALING
CRYSTAL LATTICES
TEMPERATURE DEPENDENCE
THIN FILMS
CHARGED PARTICLES
CRYSTAL STRUCTURE
ELEMENTS
FILMS
FLUIDS
GASES
HEAT TREATMENTS
IONS
METALS
NONMETALS
RARE GASES
SEPARATION PROCESSES
TRANSITION ELEMENTS
360101* - Metals & Alloys- Preparation & Fabrication
656003 - Condensed Matter Physics- Interactions between Beams & Condensed Matter- (1987-)