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Phase Transformations And Thermodynamic Properties Of Nanocrystalline Fept Powders , J. Lyubina, O. Gutfleisch, Ralph Skomski, K.-H. Müller, L. Schultz

Nebraska Center for Materials and Nanoscience: Faculty Publications

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.