|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Phase Transformations and Microstructural Evolution
||F-75: Structure-Property Relations in Doped Ni-Mn-Ga Heusler Alloys for Magnetocaloric Applications
||Michael McLeod, Zafer Turgut, Bhaskar Majumdar
|On-Site Speaker (Planned)
We report here on our ongoing work in non-stoichiometric Heusler based Ni2MnGa alloys for solid state refrigeration close to room temperature. These alloys have demonstrated 'giant' magnetocaloric effects (MCE) as a result of magnetic field induced martensitic structural transformations. One of the drawbacks of these alloys is that the magnetostructural transformation occurs over a narrow range that is typically tens of degrees far from the required refrigeration temperature; and in addition, the MCE value can be low. In this work, we have attempted to address both of these deficiencies by systematically doping with Al, In, and B. The rationale and results from these dopant studies will be discussed. These alloys also exhibit significant MCE enhancement through constant stress thermal cycling. The role of texture in such thermal cycling induced MCE improvements will be discussed.
||Planned: Supplemental Proceedings volume