Thermodynamic and magnetic properties of metastable FexCu100−x solid solutions formed by mechanical alloying
Authors:
- 15 July 1993
- journal article
- conference paper
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 74 (2) , 955-962
Abstract
Metastable solid solutions of Fe and Cu, which are immiscible in equilibrium, have been formed using high-energy ball milling of elemental powder mixtures. Single-phase face-centered-cubic (fcc) solid solution was obtained for 0<x≤60, and body-entered-cubic (bcc) solid solution for 75≤xx=70, where a mixture of fcc and bcc phases was obtained. The enthalpy of transformation to equilibrium was measured using differential scanning calorimetry. The average atomic volume of the phases exhibits a positive deviation from Vegard’s law, in qualitative agreement with the large positive enthalpy of mixing in this system. The magnetic moments and Curie temperatures for the metastable solid solutions have been determined and compared with those reported for Fe-Cu alloys formed by vapor deposition. Calculations of the formation enthalpy (ΔH) and free energy (ΔG) have been performed based on c a l p h a d data, with corrections based on our magnetization measurements. The calculated ΔG results are used to explain the observed fcc-bcc transition under polymorphous constraints.Keywords
This publication has 17 references indexed in Scilit:
- ALLOY PHASE FORMATION BY MECHANICAL ALLOYING: CONSTRAINTS AND MECHANISMSModern Physics Letters B, 1992
- Calorimetric Characterization of the Polymorphous Phase Diagram for Mechanically-Alloyed Zr-AlMaterials Science Forum, 1992
- Calorimetric evidence for polymorphous constraints on metastable Zr-Al phase formation by mechanical alloyingPhysical Review Letters, 1991
- Alloy Effects And Extended Solubilities In Binary Mixtures Of Nanometer-Sized Fe-Cu CrystalsMRS Proceedings, 1991
- The use of thermodynamic models in the prediction of the glass-forming range of binary alloysJournal of Materials Research, 1987
- Magnetic properties ofsolid solutionsPhysical Review B, 1986
- Thermodynamic and kinetic aspects of the crystal to glass transformation in metallic materialsProgress in Materials Science, 1986
- Further study on phase diagram of the iron-copper systemCalphad, 1981
- Calculation of phase diagrams of the iron-copper and cobalt-copper systemsCalphad, 1980
- Coupled phase diagrams and thermochemical data for transition metal binary systems-IIICalphad, 1978