Phases and microstructures of carbon-implanted niobium

Conference · Tue Nov 01 04:00:00 EST 1988

OSTI ID:6823716

Huang, J S; Musket, R G; Wall, M A

Polycrystalline niobium was implanted with 200, 100, and 50 keV carbon ions to create a uniform distribution of carbon over a thickness of about 0.25 ..mu..m. Samples implanted with calculated carbon content of 0.6, 1.9, 5.8, and 16 atomic percent were prepared, and the uniformity of the carbon distribution with depth was confirmed by Auger electron spectroscopy analysis. Glancing-angle x-ray diffraction analysis and transmission electron microscopy were used to characterize the phases and microstructures formed. The results indicated that no detectable second phases were present except on the surfaces where an amorphous phase and many particles were formed from contamination. Despite the low equilibrium solubility limit of carbon in Nb, we have created metastable solid solutions of Nb and C with carbon contents as high as 16 at.%. 7 refs., 5 figs., 1 tab.

• Research Organization: Lawrence Livermore National Lab., CA (USA)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6823716
• Report Number(s): UCRL-99977; CONF-881155-14; ON: DE89004017
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102 -- Metals & Alloys-- Structure & Phase Studies
360106* -- Metals & Alloys-- Radiation Effects
CARBIDES
CARBON COMPOUNDS
CARBON IONS
CHARGED PARTICLES
CRYSTAL STRUCTURE
DISPERSIONS
DISTRIBUTION
ELEMENTS
ION IMPLANTATION
IONS
METALS
MICROSTRUCTURE
MIXTURES
NIOBIUM
NIOBIUM CARBIDES
NIOBIUM COMPOUNDS
PHASE TRANSFORMATIONS
REFRACTORY METAL COMPOUNDS
SOLID SOLUTIONS
SOLUTIONS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS