ICOMAT 2022: Landau-Energy Landscape Reconstruction for a Ni-Fe-Ga(Co) Shape Memory Alloy
Channel: Kristyna Zoubkova
Date: 2022-03-23

The objective of this contribution is to construct an energy function describing the behavior of Ni-Fe-Ga(Co) ferromagnetic shape memory alloys within the framework of the 4th-order Landau theory. Elastic behavior of a single crystalline sample was studied using tensile stress-strain measurements and ultrasonic characterization in a broad temperature range. An energy landscape, constructed using the stress-strain data, captures key features of the alloy, such as the existence of the critical point or the value and tempera-ture dependence of the transformation strain. Explicit formulas for the energy landscape are included, us-ing linear and quadratic approximations to express the temperature evolution of the Landau-energy parameters.

Kristyna Zoubkova, Petr Sedlak, Hanus Seiner -  Institute of Thermomechanics, Czech Academy of Sciences, Czech Republic
Elena Villa - Institute of Condensed Matter Chemistry and Technologies for Energy, Italy
Masaki Tahara, Hideki Hosoda - Tokyo Institute of Technology Institute of Innovative Research, Japan
Volodymyr Chernenko - BCMaterials & University of Basque Country, Spain