|About this Abstract
||Materials Science & Technology 2012
||Nanotechnology for Energy, Environment, Healthcare and Industry
||Metastable γ-FeNi Nanostructures for Magnetic Refrigeration Near Room Temperature
||Huseyin Ucar, Jhon J. Ipus, Michael E. McHenry, David E. Laughlin
|On-Site Speaker (Planned)
This work presents the metastable γ-FeNi nanoparticles produced by mechanical alloying of powders using a high energy ball mill followed by a solution annealing treatment in the γ-phase region and water quenching in of the face-centered cubic γ-phase. In the Fe–Ni phase diagram there is a strong compositional dependence of the Curie temperature, Tc, on composition in the γ-phase. Stabilization of γ-phase nanostructures and the compositional tuning of Tc in Fe–Ni alloys is studied which will impact the magnetocaloric cooling near room temperature. γ-FeNi powders produced to date have a Curie temperature slightly higher than room temperature with a Refrigeration Capacity on the same order of magnitude with other prominent mangetocaloric refrigerants making this alloy a good candidate for magnetic refrigeration near room temperature with additional benefits that is non-rare earth containing and less expensive than many alternatives.