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A Study of Curie Temperatures and the Effect of Carbon in Face‐Centered Cubic Iron–Nickel Alloys
Author(s) -
Bolling G. F.,
Arrott A.,
Richman R. H.
Publication year - 1968
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.19680260239
Subject(s) - nickel , curie temperature , ferromagnetism , materials science , carbon fibers , invar , analytical chemistry (journal) , phase (matter) , metallurgy , condensed matter physics , chemistry , alloy , composite material , physics , organic chemistry , chromatography , composite number
The direct determination of Curie temperatures (θ c ) in metastable f.c.c. iron‐nickel solid solutions can be thwarted by a martensitic transformation. However, at the lower nickel contents, interstitially dissolved carbon which inhibits this phase transformation, fortuitously increases the propensity for ferromagnetism. An experimental scheme has been constructed for the determination of virtual Curie temperatures (θ Ni ) down to 0 °K in these alloys. θ c was determined (using a simple torque magnetometer) at various dissolved carbon levels for a given substitutional percent nickel; linear extrapolation to zero carbon was possible in each case. Derived results include: a linear variation, θ 2 Nivs. nickel content, intercepting for 0 °K at ≈ 25 at% Ni; an approximately constant local effect of dissolved carbon, calculated for constant volume, from the observed dθ c /d C , and known variations in these Invar‐type alloys; and the construct of ferromagnetic f.c.c. alloys at nickel contents as low as 22.6%.