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Metals 2017, 7(5), 156; doi:10.3390/met7050156

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
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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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Abstract

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

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