Hydrogen segregation to grain boundaries and external surfaces. Technical report

Technical Report · Sat Oct 01 04:00:00 EDT 1988

OSTI ID:6050687

Birnbaum, H K; Sirois, E; Ladna, B

Segregation of hydrogen to grain boundaries, surfaces, and defects was studied in Nb, Nb - V alloys, and Ni using Secondary Ion Mass Spectrometry. This technique was shown capable of determining the distribution of hydrogen at interfaces under suitable experimental conditions. Very large segregation enhancements are shown for surfaces and grain boundaries. The enhanced concentrations extend for significant distances from the surfaces. Secondary Ion Mass Spectrometry (SIMS) is one of the very few techniques capable of determining the distribution of hydrogen and its isotopes on a microscopic scale. Due to the complexity of the instrumentation and the experimental variables care must be taken to ensure that measurement artifacts do not interfere with the determinations. Generally, only qualitative analysis can be carried out unless internal standards are available; as is the case in many hydride-forming systems. This paper reviews some of the necessary experimental conditions presents and the results of applying the technique to hydrogen distributions in Nb - V alloys and Ni.

• Research Organization: Illinois Univ., Urbana (USA). Materials Research Lab.
• OSTI ID: 6050687
• Report Number(s): AD-A-202892/6/XAB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOYS
CHEMICAL REACTIONS
CRYSTAL STRUCTURE
DEFECTS
DOCUMENT TYPES
ELEMENTS
GRAIN BOUNDARIES
HYDRIDATION
HYDRIDES
HYDROGEN
HYDROGEN COMPOUNDS
ISOTOPES
METALS
MICROSTRUCTURE
NICKEL
NIOBIUM
NIOBIUM ALLOYS
NONMETALS
PROGRESS REPORT
SEGREGATION
STANDARDS
SURFACES
TRANSITION ELEMENTS
VANADIUM ALLOYS