Mechanical properties of carbon-implanted niobium

Conference · Mon Jan 01 04:00:00 EST 1990

OSTI ID:6988914

Zinkle, S J ^[1]; Huang, J S ^[2]

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1. Oak Ridge National Lab., TN (USA)
2. Lawrence Livermore National Lab., CA (USA)

Polycrystalline niobium specimens were implanted with either 200 keV carbon ions or a combination of 50, 100, and 200 keV carbon ions to peak concentrations of 0.6 to 50 at. {percent}. Microindentation techniques were used to measure the hardness and elastic modulus of the implanted layer. Both the hardness (H) and modulus (E) showed dramatic increases due to the carbon implantation. The measured peak hardness and modulus following uniform implantation with 16 at. {percent} C were 15{times} and 3{times} that of niobium, respectively, which is comparable to the literature values for NbC. The peak hardness and modulus for the implanted specimens were observed at an indent depth of {approximately}40 nm, which is about one-eighth of the depth of the implanted carbon layer. The decrease in the indentation mechanical properties at deeper indent depths is due to the interaction of long-ranging strain fields underneath the indenter with the niobium substrate. 17 refs., 6 figs.

• Research Organization: Oak Ridge National Lab., TN (USA)
• Sponsoring Organization: DOE/ER
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 6988914
• Report Number(s): CONF-900466-8; ON: DE90009864
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103 -- Metals & Alloys-- Mechanical Properties
656003* -- Condensed Matter Physics-- Interactions between Beams & Condensed Matter-- (1987-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CARBON IONS
CHARGED PARTICLES
CRYSTALS
ELASTICITY
ELEMENTS
HARDNESS
ION IMPLANTATION
IONS
MECHANICAL PROPERTIES
METALS
NIOBIUM
POLYCRYSTALS
SURFACE PROPERTIES
TENSILE PROPERTIES
TRANSITION ELEMENTS