Premium
Effect of Annealing on the Structural and Magnetic Properties of CoNiAl FSMA
Author(s) -
Hossain Md. Sarowar,
Ghosh Tanmoy,
Kanth Bhoguju Rajini,
Mukhopadhyay Pratip K.
Publication year - 2019
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.201800153
Subject(s) - materials science , austenite , ferromagnetism , annealing (glass) , magnetization , condensed matter physics , martensite , shape memory alloy , magnetic shape memory alloy , alloy , electrical resistivity and conductivity , metastability , phase (matter) , metallurgy , magnetic domain , microstructure , chemistry , magnetic field , physics , engineering , electrical engineering , organic chemistry , quantum mechanics
A ferromagnetic shape memory alloy is a very interesting system that has various structural transformation, microstructural phases and magnetic properties, and interplays among them. The system studied here is Co 39 Ni 34 Al 27 that comprises a mixture of β (body‐centered cubic) and γ (face‐centered cubic) structural phases. Here the β phase is responsible for the FSMA behavior and the γ phase improves the mechanical properties necessary for practical applications. Herein, it is showed through resistivity and magnetization measurements that post‐annealing to a higher temperature significantly alters the ratio of β and γ phases in the system, resulting in increasing the austenite to martensite transition temperature and significantly modifying the magnetic properties. Additionally, it is also shown that the low‐temperature magnetic phase of this FSMA system is a disordered magnetic system.