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Mixing enthalpies and calorimetric investigations of liquid iron‐vanadium alloys
Author(s) -
Schaefers Klaus,
Qin Jianping,
Frohberg Martin G.
Publication year - 1993
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.199301014
Subject(s) - vanadium , thermodynamics , enthalpy , chemistry , short range order , standard enthalpy of formation , calorimetry , alloy , atmospheric temperature range , metallurgy , materials science , physics , crystallography , inorganic chemistry
By means of a special levitation alloying calorimeter (LAC) the mixing enthalpies of liquid Fe‐V alloys were determined in the iron rich range, up to 35 at.% V at a mean temperature of 1990 K; in the vanadium rich range, up to 32 at.% Fe at a mean temperature of 2320 K. The results were verified by a drop calorimetric experiment, where the enthalpy of an Fe‐V alloy with 69 at.% Fe was measured. The total systematic error of the LAC was calculated to be within ± 10 %. Different thermodynamic models were applied to describe the results. By the quasi‐chemical model the experimental results for the mixing enthalpies in kJ/mol are expressed by the equation Δ H m = x Fe x V (−28.61–80.58 x Fe x V ).