|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Deformation Induced Microstructural Modification
||The Effect of Processing Parameters on the Microstructure and Performance of Ni-Mn-Ga Alloys
||Pnina Ari-Gur, Pranav Bhale, Irek I. Musabirov, Ronald D. Noebe , Vladimir G. Shavrov, Victor V. Koledov
|On-Site Speaker (Planned)
Ni-Mn-based Heusler alloys demonstrate outstanding functional properties, such as giant magnetocaloric effect and magnetic shape-memory. Larger magnetocaloric effect is achieved when the temperature of the magnetic and crystallographic phase transitions merge. For applications at the micro- and nano-scale, such as MEMS and NEMS, special processing is needed. The nature of the process and its parameters, greatly affect the microstructure and the resulting properties and performance. In the current work, Ni-Mn-Ga based alloys were manufactured by three methods – one was melt-spinning and two processes of severe plastic deformation (SPD). One SPD process was high-pressure torsion (HPT) and the other, multiple isothermal forming (MIF). The effects of process parameters, such as the number of torsion passes for the SPD and cooling rates for the melt-spun samples, on the resulting microstructure, magnetic nature, crystallographic structures, temperature and nature of their phase transformations, crystallographic texture, and internal stresses were studied and conclusions drawn.
||Magnetic Materials, Energy Conversion and Storage, Other