Thermodynamic Stability of Fe-Cr Binary System: The Crucial Role of Magnetic Contribution as Elucidated by Calorimetric Measurements

Abstract:

The influence of magnetic interactions on high temperature thermodynamic stability of Fe-Cr binary system has been analysed in the light of accurate isothermal calorimetry measurements (400-1473 K) on Fe-20wt.%Cr alloy. The onset of two successive principal transformations namely, (i) α(Fe-rich bcc)+α(Cr rich bcc)α(HT bcc) at 702±10 K; and (ii) α_ferroα_para at 925 ±10 K, with their associated enthalpy effects (Δ^oH_mag = 2 kJ mol ^-1; C_p^mag = 20 J mol^-1 K^-1) have been clearly delineated by the measured enthalpy variation with temperature. A precise quantification of magnetic contribution to high temperature thermodynamic stability has been attempted using physically based modelling approach.

• Periodical: Advanced Materials Research (Volume 794)
• Pages: 468-475
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.794.468
• Online since: September 2013
• Authors: R.N. Hajra, S. Raju, A.K. Rai, H. Tripathi, S. Saroja, T. Jayakumar
• Keywords: Calorimetry, Fe-Cr Alloy, Magnetism, Phase Stability, Thermodynamic

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