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Metals 2017, 7(5), 156;

Lattice Softening in Fe3Pt Exhibiting Three Types of Martensitic Transformations

Department of Materials Science and Engineering, Graduate School of Engineering, Osaka University, 2-1, Yamada-oka, Suita, Osaka 565-0871, Japan
Author to whom correspondence should be addressed.
Academic Editor: Volodymyr A. Chernenko
Received: 24 March 2017 / Revised: 25 April 2017 / Accepted: 26 April 2017 / Published: 27 April 2017
(This article belongs to the Special Issue Shape Memory Alloys 2017)
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We have investigated the relation between the softening of elastic constants and martensitic transformation in Fe3Pt, which exhibits various kinds of martensitic transformation depending on its long-range order parameter S. The martensite phases of the examined alloys are BCT (S = 0.57), FCT1 (S = 0.75, c/a < 1) and FCT2 (S = 0.88, c/a > 1). The elastic constants C′ and C44 of these alloys decrease almost linearly with decreasing temperature. Although the temperature coefficient of C′ decreases as S increases, C′ at the transformation temperature is the smallest in the alloy with S = 0.75, which transforms to FCT1. This result implies that softening is most strongly related to the formation of the FCT1 martensite with tetragonality c/a < 1 among the three martensites. View Full-Text
Keywords: elastic constants; band Jahn–Teller effect; disorder–order transformation elastic constants; band Jahn–Teller effect; disorder–order transformation

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Fukuda, T.; Kakeshita, T. Lattice Softening in Fe3Pt Exhibiting Three Types of Martensitic Transformations. Metals 2017, 7, 156.

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