Volume 11, Issue 3 (May 1983)

    Short-Range Ordering in Nickel-Chromium Thermocouple Alloys

    CODEN: JTEOAD

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    Abstract

    A short-range, lattice-ordering mechanism has been used extensively to explain the anomalous thermoelectric properties of such alloys as Chromel® and Nicrosil®. This concept appears to have had its origin in early crystallographic work that postulated this mechanism to explain experimentally observed changes in the relative electrical resistance of nickel-chromium alloys. Later crystallographic work, confirmed by several additional investigators, shows no evidence for the existence of short-range order in nickel-chromium alloys containing less than 25 At % Cr. Other investigators, reviewing the short-term thermoelectric deviations of these alloys, describe this mechanism as “much circumstantial evidence of a hypothesis that the short-term emf changes are due to short-range ordering in the Ni-Cr atomic structure of the Type KP thermoelement.” Since short-range ordering has not been established as being responsible for the thermoelectric properties of nickel-chromium alloys, this mechanism may not arbitrarily be considered as the sole rationale for their behaviors.


    Author Information:

    Pollock, DD
    ProfessorMember of ASTM, State University of New York at Buffalo, Buffalo, NY


    Stock #: JTE10684J

    ISSN: 0090-3973

    DOI: 10.1520/JTE10684J

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    Author
    Title Short-Range Ordering in Nickel-Chromium Thermocouple Alloys
    Symposium , 0000-00-00
    Committee E02