22,008 Result(s)
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Article
Direct observations of dislocations in splat-cooled Co5Pr
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Article
Plane steady vibration of an orthogonal elastic wedge
The problem is reduced to a single Fredholm integral equation by using a superposition of two half-plane solutions. The treatment is exact within the theory of linear elastodynamics. Dissipation is introduced ...
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A scanning electron microscopic examination of sintered barium sodium niobate
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Article
Plane steady vibration of an elastic wedge
The problem of plane steady vibration of an elastic wedge of arbitrary angle (less than 180 degrees) subject to harmonic normal and shearing tractions on its faces is reduced to a system of singular integral e...
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Article
Observation of twin faults in sputter-deposited high-purity nickel
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Article
An electron microscopy study of the metastable structures in splat-cooled erbium-zirconium alloys
The metastable structures produced by splat-cooling in Er-Zr alloys were investigated by using transmission electron microscopy and X ray analysis in order to deduce the mechanism by which a continuous series ...
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Article
Effect of non-isoelectronic cation substitution on lattice parameters of barium sodium niobate
Ceramic samples of Ba2 NaNb5O15, with the cations selectively substituted by Gd or Cr, showed that the changes in their orthorhombic lattice parametersa, b, andc were linearly correlated to each other. The change...
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Article
Long-term mechanical behaviour of optical fibres coated with a u.v.-curable epoxy acrylate
Long-term strength tests have been performed on glass fibres drawn from both Suprasil rods and graded index pre-forms in a laser furnace and in a graphite resistance furnace and coated in both cases with a u.v...
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Article
Conductivity and creep in acceptor-dominated polycrystalline Al2O3
Ionic and electronic conductivity and compressive creep of hot-pressed polycrystalline acceptor-dominated Al2O3 were measured as a function of oxygen partial pressure and grain size varying from 3 to 200 μm. Hole...
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Article
Pore formation during oxidative annealing of Al2O3 −∶Fe and slowing of grain growth by precipitates and pores
High-density samples of polycrystalline Al2O3 doped with iron retain their high density when annealed at high temperature in a reducing atmosphere, but pores are formed, both inside grains and at grain boundaries...
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Article
Annealing behaviour of amorphous μ- phase alloys of FeW and MoCo
Crystallization in sputter deposited, amorphous FeW and MoCo of μ-phase composition alloys has been studied using transmission electron microscopy (TEM), electrical resistivity and X-ray diffraction. The amorphou...
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Article
Effect of high pressure on the crystallization of an amorphous Fe83 B17 alloy
Amorphous Fe-17 at %B alloy prepared by a splat-quenching technique was annealed at temperatures ranging from 250 to 500° C for different periods. A time-temperature transformation diagram has been constructed...
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Article
Crystallization of sputter deposited amorphous MoNi
A crystallization temperature of ∼ 1000 K was observed for an amorphous alloy of MoNi. Recovery of the amorphous matrix prior to crystallization was noted, however. During crystallization, a Mo-rich phase and ...
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Article
Polymer Coating of Glass Microballoons Levitated in a Focused Acoustic Field
Inertial confinement fusion (ICF) glass microballoons (GMBs) levitated in a focusing radiator acoustic device can be coated with liquid materials by deploying the liquid into the levitation field with a steppe...
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Article
Phase Transformation Studies of Laser-Processed Fe-0.2%C-Cr Surface Alloys
Phase transformations in laser-processed Fe-0.2%C-Cr surface alloys with 5%, 10%, 20%, and 30%Cr were studied by light and electron microscopy. Alloys containing 5% and 10%Cr were found to be fully martensitic...
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Article
An Ion-Scattering Study of Oxygen Indiffusion during Pulsed Laser Annealing/Cleaning of Silicon
Oxygen indiffusion during pulsed laser annealing of silicon has been studied using the 186 O(α,α) 186 O resonance at 3.045 MeV. Anneals were carried out with a Q–switched ruby laser, energy density of the pulses ...
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Article
Application of Microgravity and Containerless Environments to the Investigation of Fusion Target Fabrication Technology
During the past few years we have been studying several of the physical processes relevant to the production of spherical shells for inertial confinement fusion targets, both in a microgravity environment and ...
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Article
A Comparison of Atomic Mixing Behaviour of Cu - Au and Cu - W Systems for Room Temperature and Low Temperature Irradiation
300 keV Kr ion irradiations with doses varying from 2 × 1015 to 2 × 1016 at/cm have been applied to initiate mixing of Cu-Au and Cu-W systems. As under normal thermodynamic conditions the Cu-Au system is miscible...
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Article
Investigation of Metallic and Metallic Glass Hollow Spheres for Fusion Target Application
High quality metallic and metallic-glass microballoons (MMB and MGMB) are of considerable interest for fusion target applications on account of the intrinsic properties of these materials such as high density,...
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Article
Application of Ion Beam Techniques to the Study of Glass Durability: Enhanced Dissolution in Saline and Radiation Effects
Nuclear reaction analysis, Rutherford backscattering and ion implantation techniques are applied to the study of the reaction between glass and aqueous solutions. The use of these techniques is described as ar...
