|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Late News Poster Session
||H-31: Evolution of Microstructure and Crystallographic Texture of Ni-Mn-Ga Melt-spun Ribbons Exhibiting 1.15% Magnetic Field-induced Strain
||Anna Wojcik, Robert Chulist, Maciej Kowalczyk, Przemyslaw Zackiewicz, Pawel Czaja, Norbert Schell, Wojciech Maziarz
|On-Site Speaker (Planned)
The microstructure and texture evolution of Ni-Mn-Ga melt-spun ribbons were investigated by high-energy synchrotron radiation and electron backscatter diffraction. The as-spun ribbons were thermally treated in order to optimize microstructure, atomic order degree, and crystallographic texture influencing on the functional properties. The optimum annealing treatment at 1173 K for 72 h allowed to produce a homogenous <100> fiber texture with the grain size spanning the entire ribbon thickness. A homogenous radial microstructure ensured in-plane stress/strain compatibility, which gives rise to strain accommodation during variant reorientation. Special attention was also given to the evaluation of atomic order, which mainly controls the characteristic transformation temperatures and reduces the twinning stress to a level sufficiently low for martensitic variant reorientation under magnetic field. As a result, 1.15% magnetic field-induced strain in the self-accommodated state was achieved.
National Centre for Research and Development (NCBiR) of Poland is acknowledged for funding (TECHMATSTRATEG 2/410941/4/NCBR/2019).
||Phase Transformations, Process Technology, Solidification