Migration and release of helium-3 implanted in single-crystal nickel

Thesis/Dissertation · Thu Jan 01 00:00:00 EST 1987

OSTI ID:5357483

Maki, J T

Several nickel single-crystal samples were implanted with 150-keV helium-3 ions to doses between 9.2 x 10/sup 18/ and 2.0 x 10/sup 20/ m/sup -2/. After implantation, the samples were isochronally annealed at various temperatures between 300 and 1300/sup 0/C. Following each annealing step, helium distributions were measured by a nuclear-reaction technique called neutron depth profiling. The technique determines a helium profile from the measured energy distribution of emitted protons produced by the /sup 3/He(n,p)/sup 3/H reaction when a sample is placed in a thermal-neutron beam. The measured profiles were then deconvoluted by an iterative chi-square minimization method. The helium depth profiles can be compared to illustrate helium migration or loss as a function of annealing temperature. Two new results were determined by this experiment and may be summarized as follows. The first results was the demonstration of a helium-concentration-dependent release pattern where one sample with an initial helium dose of about 6 x 10/sup 19/ m/sup -2/ was the most stable and displayed the least amount of helium release up to annealing temperatures as high as 1300/sup 0/C. The second result was the observation that profile peaking (a narrowing of the helium distribution with an increase in peak concentration) occurred for samples with initial doses within a certain range when annealed at 1000/sup 0/C.ng-tool

• Research Organization: Michigan Univ., Ann Arbor (USA)
• OSTI ID: 5357483
• Resource Relation: Other Information: Thesis (Ph. D.)
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
HELIUM 3 REACTIONS
NICKEL
ION IMPLANTATION
ANNEALING
HELIUM 3 BEAMS
HIGH TEMPERATURE
KEV RANGE 100-1000
MIGRATION LENGTH
MONOCRYSTALS
VERY HIGH TEMPERATURE
BEAMS
CHARGED-PARTICLE REACTIONS
CRYSTALS
DIMENSIONS
ELEMENTS
ENERGY RANGE
HEAT TREATMENTS
ION BEAMS
KEV RANGE
LENGTH
METALS
NUCLEAR REACTIONS
TRANSITION ELEMENTS
360106* - Metals & Alloys- Radiation Effects