Annealing effects on the structural and magnetic properties of off-stoichiometric Fe-Mn-Ga ferromagnetic shape memory alloys

H. Yang; Y. Chen; H. Bei; C. R. dela Cruz; Y. D. Wang; K. An

doi:10.1016/j.matdes.2016.04.098

Annealing effects on the structural and magnetic properties of off-stoichiometric Fe-Mn-Ga ferromagnetic shape memory alloys

H. Yang, Y. Chen, H. Bei, C. R. dela Cruz, Y. D. Wang, K. An

Materials Engineering

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20 Scopus citations

Abstract

Annealing plays an important role in modifying structures and properties of ferromagnetic shape memory alloys (FSMAs). The annealing effect on the structures and magnetic properties of off-stoichiometric Fe₄₅Mn₂₆Ga₂₉ FSMA has been investigated at different elevated temperatures. Rietveld refinements of neutron diffraction patterns display that the formation of the ɣ phase in Fe₄₅Mn₂₆Ga₂₉ annealed at 1073 K increases the martensitic transformation temperature and reduces the thermal hysteresis in comparison to the homogenized sample. The phase segregation of a Fe-rich cubic phase and a Ga-rich cubic phase occurs at the annealing temperature of 773 K. The atomic occupancies of the alloys are determined thanks to the neutron's capability of differentiating transition metals. The annealing effects at different temperatures introduce a different magnetic characteristic that is associated with distinctive structural changes in the crystal.

Original language	English
Pages (from-to)	327-332
Number of pages	6
Journal	Materials and Design
Volume	104
DOIs	https://doi.org/10.1016/j.matdes.2016.04.098
State	Published - Aug 15 2016

Funding

The H.Y. thanks China Scholarship Council for the financial support during the visit to University of Tennessee, TN, SNS, ORNL and National Basic Research Program of China ( 2012CB619405 ). Neutron scattering experiments were carried out at SNS and HFIR which are national user facilities sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences (BES), U.S. Department of Energy . Material fabrication (H. Bei) was supported by the Materials Science and Engineering Division, Office of Sciences, Basic Energy Sciences (BES), U.S. Department of Energy . The authors thank Dr. A. Huq at SNS and Ms. K. Andrews at HFIR for the technical support of the neutron experiments.

Funders	Funder number
U.S. Department of Energy
Office of Science
Basic Energy Sciences
Oak Ridge National Laboratory
Division of Materials Sciences and Engineering
China Scholarship Council
National Key Research and Development Program of China	2012CB619405
National Key Research and Development Program of China

Keywords

Annealing
Ferromagnetic shape memory alloy
Phase segregation
ɣ phase

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10.1016/j.matdes.2016.04.098

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abstract = "Annealing plays an important role in modifying structures and properties of ferromagnetic shape memory alloys (FSMAs). The annealing effect on the structures and magnetic properties of off-stoichiometric Fe45Mn26Ga29 FSMA has been investigated at different elevated temperatures. Rietveld refinements of neutron diffraction patterns display that the formation of the ɣ phase in Fe45Mn26Ga29 annealed at 1073 K increases the martensitic transformation temperature and reduces the thermal hysteresis in comparison to the homogenized sample. The phase segregation of a Fe-rich cubic phase and a Ga-rich cubic phase occurs at the annealing temperature of 773 K. The atomic occupancies of the alloys are determined thanks to the neutron's capability of differentiating transition metals. The annealing effects at different temperatures introduce a different magnetic characteristic that is associated with distinctive structural changes in the crystal.",

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AU - Yang, H.

AU - Chen, Y.

AU - Bei, H.

AU - dela Cruz, C. R.

AU - Wang, Y. D.

AU - An, K.

PY - 2016/8/15

Y1 - 2016/8/15

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AB - Annealing plays an important role in modifying structures and properties of ferromagnetic shape memory alloys (FSMAs). The annealing effect on the structures and magnetic properties of off-stoichiometric Fe45Mn26Ga29 FSMA has been investigated at different elevated temperatures. Rietveld refinements of neutron diffraction patterns display that the formation of the ɣ phase in Fe45Mn26Ga29 annealed at 1073 K increases the martensitic transformation temperature and reduces the thermal hysteresis in comparison to the homogenized sample. The phase segregation of a Fe-rich cubic phase and a Ga-rich cubic phase occurs at the annealing temperature of 773 K. The atomic occupancies of the alloys are determined thanks to the neutron's capability of differentiating transition metals. The annealing effects at different temperatures introduce a different magnetic characteristic that is associated with distinctive structural changes in the crystal.

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Annealing effects on the structural and magnetic properties of off-stoichiometric Fe-Mn-Ga ferromagnetic shape memory alloys

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Keywords

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