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

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 γ 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.

Authors:
 [1];  [1];  [1];  [2];  [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Beijing Institute of Technology, China; Beijing Inst. of Technology (China)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1254789
Alternate Identifier(s):
OSTI ID: 1326429
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Materials & Design
Additional Journal Information:
Journal Volume: 104; Journal ID: ISSN 0264-1275
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Chen, Yan, Bei, Hongbin, Dela Cruz, Clarina R, Wang, Yandong, and An, Ke. Annealing effects on the structural and magnetic properties of off-stoichiometric Fe-Mn-Ga ferromagnetic shape memory alloys. United States: N. p., 2016. Web. doi:10.1016/j.matdes.2016.04.098.
Chen, Yan, Bei, Hongbin, Dela Cruz, Clarina R, Wang, Yandong, & An, Ke. Annealing effects on the structural and magnetic properties of off-stoichiometric Fe-Mn-Ga ferromagnetic shape memory alloys. United States. https://doi.org/10.1016/j.matdes.2016.04.098
Chen, Yan, Bei, Hongbin, Dela Cruz, Clarina R, Wang, Yandong, and An, Ke. 2016. "Annealing effects on the structural and magnetic properties of off-stoichiometric Fe-Mn-Ga ferromagnetic shape memory alloys". United States. https://doi.org/10.1016/j.matdes.2016.04.098. https://www.osti.gov/servlets/purl/1254789.
@article{osti_1254789,
title = {Annealing effects on the structural and magnetic properties of off-stoichiometric Fe-Mn-Ga ferromagnetic shape memory alloys},
author = {Chen, Yan and Bei, Hongbin and Dela Cruz, Clarina R and Wang, Yandong and An, Ke},
abstractNote = {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 γ 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.},
doi = {10.1016/j.matdes.2016.04.098},
url = {https://www.osti.gov/biblio/1254789}, journal = {Materials & Design},
issn = {0264-1275},
number = ,
volume = 104,
place = {United States},
year = {Sat May 07 00:00:00 EDT 2016},
month = {Sat May 07 00:00:00 EDT 2016}
}

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Cited by: 16 works
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Works referenced in this record:

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Works referencing / citing this record:

A variable pole magnet
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Effect of annealing on interior Vickers hardness and surface work function of light alloys
journal, September 2019