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Study of the paramagnetic-antiferromagnetic transition and the γ → ε martensitic transformation in Fe-Mn alloys

Study of the paramagnetic-antiferromagnetic transition and the γ → ε martensitic transformation... The paramagnetic-antiferromagnetic transition and the γ → ε martensitic transformation of Fe-Mn (Mn 15–32 wt%) alloys have been investigated by resistivity, dilatometry and X-ray diffraction (XRD). The results show that paramagnetic-antiferromagnetic transition increases the resistivity and the volume of alloys, whereas the γ → ε martensitic transformation reduces the resistivity and volume of alloys. The A f ε that was determined by the dilatometric method is not the temperature that ε martensites in the Fe-Mn alloys have reverse transformed to austenites completely. Mn additions reduce M s, increase T N and the lattice parameter of austenite in the Fe-Mn alloys. Both the antiferromagnetic transition and the γ → ε martensitic transformation lead to an increase in the lattice parameter of austenite. The lattice parameters both above T N and below T N decrease linearly with temperature. The lattice parameter below M s increases first and then decreases. Moreover, the α (110) and ε (002) atomic planes in the Fe-15Mn-0.15C alloy are separated into two peaks: 2θ for ε(002) is 44.16°, 2θ for α(110) is 44.47°. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Materials Science Springer Journals

Study of the paramagnetic-antiferromagnetic transition and the γ → ε martensitic transformation in Fe-Mn alloys

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References (20)

Publisher
Springer Journals
Copyright
Copyright © 2000 by Kluwer Academic Publishers
Subject
Materials Science; Materials Science, general; Characterization and Evaluation of Materials; Polymer Sciences; Continuum Mechanics and Mechanics of Materials; Crystallography and Scattering Methods; Classical Mechanics
ISSN
0022-2461
eISSN
1573-4803
DOI
10.1023/A:1004865331956
Publisher site
See Article on Publisher Site

Abstract

The paramagnetic-antiferromagnetic transition and the γ → ε martensitic transformation of Fe-Mn (Mn 15–32 wt%) alloys have been investigated by resistivity, dilatometry and X-ray diffraction (XRD). The results show that paramagnetic-antiferromagnetic transition increases the resistivity and the volume of alloys, whereas the γ → ε martensitic transformation reduces the resistivity and volume of alloys. The A f ε that was determined by the dilatometric method is not the temperature that ε martensites in the Fe-Mn alloys have reverse transformed to austenites completely. Mn additions reduce M s, increase T N and the lattice parameter of austenite in the Fe-Mn alloys. Both the antiferromagnetic transition and the γ → ε martensitic transformation lead to an increase in the lattice parameter of austenite. The lattice parameters both above T N and below T N decrease linearly with temperature. The lattice parameter below M s increases first and then decreases. Moreover, the α (110) and ε (002) atomic planes in the Fe-15Mn-0.15C alloy are separated into two peaks: 2θ for ε(002) is 44.16°, 2θ for α(110) is 44.47°.

Journal

Journal of Materials ScienceSpringer Journals

Published: Oct 16, 2004

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