| About this Abstract |
| Meeting |
Materials Science & Technology 2020
|
| Symposium
|
Thermodynamic Properties, Structure and Phase Stabilities of Special Alloys
|
| Presentation Title |
Thermodynamic Modeling of the Ga-Mn-Ni System for Heusler Alloy Development |
| Author(s) |
Liangyan Hao, Jakub Toman, Markus Chmielus, Wei Xiong |
| On-Site Speaker (Planned) |
Liangyan Hao |
| Abstract Scope |
The Ni-Mn-Ga Heusler alloys are important functional materials because of the shape-memory and magnetocaloric effects, and thus often used in actuators and refrigerants. This work applies the CALPHAD (CALculation of PHAse Diagrams) approach with the new generation of lattice stability to describe the thermodynamics of the Ga-Mn-Ni system supported by experiments and ab initio calculations. Experiments are performed to address the existing contradictories in the Ga-Mn system. The DFT method is applied to calculate the enthalpy of formation of Ga-Mn intermetallic compounds. The thermodynamic parameters of the Ni-Mn-Ga system are obtained by extrapolation from the three binary subsystems. This work will facilitate the composition and processing designs of novel Heusler alloys with desired properties. |