Helium-3 in nickel-base amorphous metals: Surface features, subsurface microstructure, migration, and release upon annealing

Miscellaneous · Sun Jan 01 00:00:00 EST 1989

OSTI ID:6281452

Uenleu, K

The amorphous alloys Ni{sub 75.1}Cr{sub 14}P{sub 10.1}C{sub 0.08}, Ni{sub 63.5}Zr{sub 36.5}, and Ni{sub 87.7}P{sub 12.3} have been implanted with 150 keV helium-3 ions with doses 1 {times} 10{sup 16} He{sup 3}/cm{sup 2} and 5 {times} 10{sup 16} He{sup 3}/cm{sup 2}. The samples were isochronally annealed at several consecutive stages up t their crystallization temperatures. The surface features were examined by scanning electron microscope, subsurface microstructural changes were investigated by electron diffraction using a scanning transmission electron microscope, and helium-3 depth profiles were measured by a thermal neutron induced nuclear reaction technique called neutron depth profiling (NDP). It was confirmed that for amorphous metals: (a) the helium-3 release is concentration dependent; (b) the migration and the release of helium-3 is controlled by detrapping mechanism; and (c) the crystallization temperatures obtained in this study are in agreement with the reported values. The penetration depth or the projected depth of helium-3 ions with an initial energy of 150 keV is measured here for the first time after obtaining the depth profiles by using the NDP technique. The most probable range values are: 320 nm for Ni{sub 75.1}Cr{sub 14}P{sub 10.1}C{sub 0.08}, 378 nm for Ni{sub 63.5}Zr{sub 36.5} and 375 nm for Ni{sub 87.7}P{sub 12.3}. No blisters, bubbles or pitting were observed on the samples when they were annealed up to their crystallization temperature. Some of the helium-3 trapped in amorphous metals seems not to be as strongly bound as in single crystal nickel. More helium-3 release was observed for the metal-metal amorphous metal samples than the metal-metalloid amorphous metal. For metal-metal amorphous alloy the helium-3 release behavior can be correlated with the partial or full crystallization. For metal-metalloid amorphous alloys this correlation may depend on the chemical composition.

• Research Organization: Michigan Univ., Ann Arbor, MI (USA)
• OSTI ID: 6281452
• Resource Relation: Other Information: Thesis (Ph. D.)
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CHROMIUM ALLOYS
ION IMPLANTATION
SURFACE PROPERTIES
NICKEL BASE ALLOYS
PHOSPHORUS COMPOUNDS
ZIRCONIUM ALLOYS
AMORPHOUS STATE
ANNEALING
CARBON ADDITIONS
CRYSTALLIZATION
DEPTH
ELECTRON DIFFRACTION
HELIUM 3
HELIUM IONS
MICROSTRUCTURE
MORPHOLOGICAL CHANGES
NEUTRON BEAMS
NUCLEAR REACTIONS
PHYSICAL RADIATION EFFECTS
QUANTITY RATIO
SCANNING ELECTRON MICROSCOPY
THERMAL NEUTRONS
TRANSMISSION ELECTRON MICROSCOPY
ALLOYS
BARYONS
BEAMS
CHARGED PARTICLES
COHERENT SCATTERING
CRYSTAL STRUCTURE
DIFFRACTION
DIMENSIONS
ELECTRON MICROSCOPY
ELEMENTARY PARTICLES
EVEN-ODD NUCLEI
FERMIONS
HADRONS
HEAT TREATMENTS
HELIUM ISOTOPES
IONS
ISOTOPES
LIGHT NUCLEI
MICROSCOPY
NEUTRONS
NICKEL ALLOYS
NUCLEI
NUCLEON BEAMS
NUCLEONS
PARTICLE BEAMS
PHASE TRANSFORMATIONS
RADIATION EFFECTS
SCATTERING
STABLE ISOTOPES
360106* - Metals & Alloys- Radiation Effects
360104 - Metals & Alloys- Physical Properties
360102 - Metals & Alloys- Structure & Phase Studies