STP643

    In Situ Auger Electron Spectroscopy Tensile Fracture Study of Nickel Alloys

    Published: Jan 1978


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    Abstract

    An elevated temperature tensile fracture device has been built for in situ Auger electron spectroscopy studies that permits characterization of grain boundary chemistry of high-temperature structural materials. The system has been applied to a series of commercial nickel-base superalloys doped with impurities known to have deleterious effects on the mechanical properties. Clear grain boundary segregation of the elements bismuth, tellurium, lead, and sulfur has been observed confirming that the elements most harmful to the mechanical properties of superalloys are also those that are grain boundary active. The additive hafnium was found to be effective in restricting the grain boundary segregation of sulfur by combining with sulfur to form a stable carbosulfide compound.

    Keywords:

    quantitative analysis, materials, spectroscopy, Auger electrons, surface chemistry, sputtering, mechanical properties, fractures (materials), embrittlement, segregation, grain boundaries, impurities, solubility, solutes, nickel alloys, super-alloys, sulfur, bismuth, tellurium, lead, selenium, thallium


    Author Information:

    Walsh, JM
    Assistant materials project engineer and senior materials engineers, Materials Engineering and Research Laboratory, Pratt & Whitney Aircraft, Middletown, Conn

    Gumz, KP
    Assistant materials project engineer and senior materials engineers, Materials Engineering and Research Laboratory, Pratt & Whitney Aircraft, Middletown, Conn

    Anderson, NP
    Assistant materials project engineer and senior materials engineers, Materials Engineering and Research Laboratory, Pratt & Whitney Aircraft, Middletown, Conn


    Paper ID: STP25601S

    Committee/Subcommittee: E42.03

    DOI: 10.1520/STP25601S


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