Heat-Treatment Processing for MnBi in High Magnetic Fields

Kazuo Watanabe; Yoshifuru Mitsui; Keiichi Koyama

doi:10.4028/www.scientific.net/AST.78.19

Paper Titles

From Dual-Shape/Temperature Memory Effect to Triple-Shape Memory Effect in NiTi Shape Memory Alloys
p.1

Theoretical Study of Magnetic Properties and Twin Boundary Motion in Heusler Ni-Mn-X Shape Memory Alloys Using First Principles and Monte Carlo Method
p.7

The Effect of Pressure on Martensitic Phase Transformations
p.13

Heat-Treatment Processing for MnBi in High Magnetic Fields
p.19

Composition Dependence of Compatibility in Self-Accommodation Microstructure of β-Titanium Shape Memory Alloy
p.25

CuZnAl Shape Memory Alloys Foams
p.31

Functional Fatigue of NiTi Shape Memory Wires under Assorted Loading Conditions
p.40

Transformation Behavior of Shape Memory Alloys in Multiaxial Stress State
p.46

HomeAdvances in Science and TechnologyAdvances in Science and Technology Vol. 78Heat-Treatment Processing for MnBi in High...

Heat-Treatment Processing for MnBi in High Magnetic Fields

Abstract:

The phase diagram for MnBi was investigated in high fields up to 18 T at temperatures ranging from 300 to 730 K. We used the differential thermal analysis (DTA), in order to examine the equilibrium phase change of ferromagnetic MnBi by applying high magnetic fields. In particular, the first-order magnetic phase transition to the paramagnetic phase at the decomposition temperature Tt ~ 628 K for ferromagnetic MnBi was evaluated in fields up to 26 T. It was found that Tt increases with increasing magnetic fields at the rate of 2 K/T in low fields up to 18 T, and clearly deviates from the linear increase above 20 T. From a viewpoint of application, it is important that the decomposition of MnBi can be controlled by a magnetic field. As a result, Tt on the liquid phase line changes the amount of Mn content from 10 to 16.5at.% at 26 T, and the heat-treatment at 26 T improves the volume fraction of MnBi. Further, it is quite interesting to directly synthesize ferromagnetic MnBi from the liquid phase without the paramagnetic phase transformation.

You might also be interested in these eBooks

State-of-the-Art Research and Application of SMAs Technologies (4th CIMTEC)

View Preview

Info:

Periodical:

Advances in Science and Technology (Volume 78)

Pages:

19-24

DOI:

https://doi.org/10.4028/www.scientific.net/AST.78.19

Citation:

Cite this paper

Online since:

September 2012

Authors:

Kazuo Watanabe, Yoshifuru Mitsui, Keiichi Koyama

Keywords:

Differential Thermal Analysis (DTA), Heat Treatment, Magnetic Field Effect, MnBi, Phase Diagram

Export:

RIS, BibTeX

Price:

Permissions CCC:

Request Permissions

Permissions PLS:

Request Permissions

Сopyright:

Citation:

References

[1] M. Sagawa, S. Fujimura, H. Yamamoto, Y. Matsuura, K. Hiraga, IEEE Trans. Magn. MAG-20 (1984) 1584-1589.

DOI: 10.1109/tmag.1984.1063214

Google Scholar

[2] X. Guo, X. Chen, Z. Altounian, Strom-Olsen, J. Appl. Phys. 73 (1993) 6275-6277.

Google Scholar

[3] S. Cao, M. Yue, Y. X. Yang, D. T. Zhang, W. Q. Liu, J. X. Zhang, Z. H. Guo, W. Li, J. Appl. Phys. 109 (2011) 07A740.

Google Scholar

[4] D. T. Zhang, S. Cao, M. Ye, W. Q. Liu, J. X. Zhang, Y. Qiang, J. Appl. Phys. 109 (2011) 07A722.

Google Scholar

[5] G. Nishijima, S. Awaji, S. Hanai, K. Watanabe, Fusion Engineering and Design 81 (2006) 2425-2432.

DOI: 10.1016/j.fusengdes.2006.07.064

Google Scholar

[6] K. Watanabe, G. Nishijima, S. Awaji, K. Takahashi, K. Koyama, N. Kobayashi, M. Ishizuka, T. Itou, T. Tsurudome, J. Sakuraba, IEEE Trans. Appl. Supercond. 16 (2006) 934-939.

DOI: 10.1109/tasc.2006.870787

Google Scholar

[7] K. Koyama, Y. Mitsui, E.S. Choi, Y. Ikehara, E.C. Palm, K. Watanabe, J. Alloys and Compounds 509 (2011) L78-L80.

DOI: 10.1016/j.jallcom.2010.11.082

Google Scholar