Effect of FCC anti-ferromagnetic ordering on the stability of phases in Fe60-xMn30Cr10Cox high entropy alloys

M.D. ACCIARRI; P. LA ROCA; L.M. GUERRERO; A. BARUJ; J. CURIALE; M. SADE

JOURNAL OF ALLOYS AND COMPOUNDS

ELSEVIER SCIENCE SA

Año: 2020 vol. 823

0925-8388

The FCC-HCP martensitic transformation in High-Mn steels is strongly affected by the magnetic ordering of the FCC austenite which stabilizes this structure. This manuscript extends the analysis of relative phase stabilities and the effect of magnetic ordering to the FeMnCrCo high entropy alloys recently developed. The effect of Co addition on the martensitic transformation temperatures and magnetic order temperature has been experimentally determined. In the same way as in ternary Fe-Mn-X based alloys, it is shown that the antiferromagnetic state of the FCC phase stabilizes this structure. However, this stabilization is less strong in the present quaternary alloys, and -by specific heat measurements- we show that this effect can be rationalized by a decrease of the magnetic entropy change when Co is added. The present results and conclusions are important to design new High Entropy Alloys with a larger number of components.