Phase transformations and thermodynamic properties of nanocrystalline FePt powders

Authors

J. Lyubina, IFW Dresden, Institute for Metallic Materials
O. Gutfleisch, IFW Dresden, Institute for Metallic Materials
Ralph Skomski, University of Nebraska-LincolnFollow
K.-H. Müller, IFW Dresden, Institute for Metallic Materials
L. Schultz, IFW Dresden, Institute for Metallic Materials

Date of this Version

August 2005

Comments

Published in Scripta Materialia 53 (2005), pp. 469–474. © 2005 Acta Materialia Inc. Published by Elsevier Ltd. Used by permission. doi:10.1016/j.scriptamat.2005.04.041
http://www.actamat-journals.com
http://www.sciencedirect.com

Abstract

The solid state reactions and structural evolution in nanocrystalline FePt powders during mechanical ball milling at 77 K and subsequent annealing have been investigated. Above 310 °C the formation of L1₀ FePt is observed. As the milling time increases, the enthalpy evolved during the transformations is reduced, whereas the corresponding activation energy increases. For accelerating the ordering process a fine lamellar structure of Fe and Pt is favourable.