Calculation of transformed fraction using resistivity data: A comparison of various conductivity models

Mohan, Murali and Singh, AK (1989) Calculation of transformed fraction using resistivity data: A comparison of various conductivity models. Technical Report. National Aeronautical Laboratory, Bangalore, India.

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    Abstract

    Various models of-effective electrical conductivity of a two phase system have been used to calculate the kinetics data from the resistance-time (t) data recorded during the a=w transformation in titanium and fcc+bcc transformation in ytterbium. The transformed fraction, for titanium, as calculated from the different conductivity models lie within 14 percent at = 0.02, .7 percent at = 0.5 and 0.5 percent at = 0.95. The - t data for titanium satisfy Avraml equation = l-exp-( ,t/T)n in all the cases and the values of the constants, the time exponent n and the characteristic time T lie within 3.5 percent. However, for ytterbium the values differ by a factor 4 at = 0.01, a factor 1 .5 at = 0.5 and a factor 1.05 at = 0.9. The values for ytterbium.obtained from the Landauer model fit Avrami equation better than those obtained from other conductivity models. The values of n and T for ytterbium differ by factors 1.4 and 2.8 respectively. It is seen that the values obtained from different conductivity models differ appreciably as the magnitude of the resistance change at the transformation increases

    Item Type: Proj.Doc/Technical Report (Technical Report)
    Uncontrolled Keywords: Effective conductivity;Various models
    Subjects: AERONAUTICS > Air Transportation and Safety
    Division/Department: Materials Science Division, Materials Science Division
    Depositing User: Deputy Head Poornima Narayana
    Date Deposited: 14 Jul 2006
    Last Modified: 24 May 2010 09:45
    URI: http://nal-ir.nal.res.in/id/eprint/2032

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