A new type of FCT martensite phase in single-crystalline Fe3Pt Invar alloy

Masataka Yamamoto; Sayaka Sekida; Takashi Fukuda; Tomoyuki Kakeshita; Kohki Takahashi; Keiichi Koyama; Hiroyuki Nojiri

doi:10.1016/j.jallcom.2011.06.035

A new type of FCT martensite phase in single-crystalline Fe₃Pt Invar alloy

Masataka Yamamoto, Sayaka Sekida, Takashi Fukuda, Tomoyuki Kakeshita, Kohki Takahashi, Keiichi Koyama, Hiroyuki Nojiri

Research output: Contribution to journal › Article › peer-review

9 Citations (Scopus)

Abstract

Martensitic transformation in a highly ordered Fe₃Pt has been investigated by magnetization and X-ray diffraction measurements. We confirmed that a new type of face-centered tetragonal (FCT) martensite phase appears below 60 K in Fe₃Pt with a degree of order S = 0.88. The tetragonality c/a gradually increases with decreasing temperature, and is approximately 1.005 at 10 K. This is in contrast to the tetragonality c/a < 1 generally observed in the FCT martensite with a degree of order less than 0.8. The spontaneous magnetization increases in association with the transformation.

Original language	English
Pages (from-to)	8530-8533
Number of pages	4
Journal	Journal of Alloys and Compounds
Volume	509
Issue number	34
DOIs	https://doi.org/10.1016/j.jallcom.2011.06.035
Publication status	Published - 2011 Aug 25

Keywords

Invar alloys
Magnetic measurements
Phase transitions
TEM
Transmission electron microscopy
X-ray diffraction

ASJC Scopus subject areas

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

Access to Document

10.1016/j.jallcom.2011.06.035

Cite this

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title = "A new type of FCT martensite phase in single-crystalline Fe3Pt Invar alloy",

abstract = "Martensitic transformation in a highly ordered Fe3Pt has been investigated by magnetization and X-ray diffraction measurements. We confirmed that a new type of face-centered tetragonal (FCT) martensite phase appears below 60 K in Fe3Pt with a degree of order S = 0.88. The tetragonality c/a gradually increases with decreasing temperature, and is approximately 1.005 at 10 K. This is in contrast to the tetragonality c/a < 1 generally observed in the FCT martensite with a degree of order less than 0.8. The spontaneous magnetization increases in association with the transformation.",

keywords = "Invar alloys, Magnetic measurements, Phase transitions, TEM, Transmission electron microscopy, X-ray diffraction",

author = "Masataka Yamamoto and Sayaka Sekida and Takashi Fukuda and Tomoyuki Kakeshita and Kohki Takahashi and Keiichi Koyama and Hiroyuki Nojiri",

note = "Funding Information: Part of this work was performed at the High Field Laboratory for Superconducting Materials, Institute for Materials Research, Tohoku University, and also at Research Center for Ultra-High Voltage Electron Microscopy, Osaka University. The authors thank Mr. Taguchi for his support in conducting TEM observation. This work was supported by the Priority Assistance for the Formation of Worldwide Renowned Centers of Research – The Global COE Program (Project: Center of Excellence for Advanced Structural and Functional Materials Design) funded by MEXT , Japan, and also by Kiban B (No. 23360280 ) from JSPS.",

year = "2011",

month = aug,

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doi = "10.1016/j.jallcom.2011.06.035",

language = "English",

volume = "509",

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journal = "Journal of Alloys and Compounds",

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T1 - A new type of FCT martensite phase in single-crystalline Fe3Pt Invar alloy

AU - Yamamoto, Masataka

AU - Sekida, Sayaka

AU - Fukuda, Takashi

AU - Kakeshita, Tomoyuki

AU - Takahashi, Kohki

AU - Koyama, Keiichi

AU - Nojiri, Hiroyuki

N1 - Funding Information: Part of this work was performed at the High Field Laboratory for Superconducting Materials, Institute for Materials Research, Tohoku University, and also at Research Center for Ultra-High Voltage Electron Microscopy, Osaka University. The authors thank Mr. Taguchi for his support in conducting TEM observation. This work was supported by the Priority Assistance for the Formation of Worldwide Renowned Centers of Research – The Global COE Program (Project: Center of Excellence for Advanced Structural and Functional Materials Design) funded by MEXT , Japan, and also by Kiban B (No. 23360280 ) from JSPS.

PY - 2011/8/25

Y1 - 2011/8/25

N2 - Martensitic transformation in a highly ordered Fe3Pt has been investigated by magnetization and X-ray diffraction measurements. We confirmed that a new type of face-centered tetragonal (FCT) martensite phase appears below 60 K in Fe3Pt with a degree of order S = 0.88. The tetragonality c/a gradually increases with decreasing temperature, and is approximately 1.005 at 10 K. This is in contrast to the tetragonality c/a < 1 generally observed in the FCT martensite with a degree of order less than 0.8. The spontaneous magnetization increases in association with the transformation.

AB - Martensitic transformation in a highly ordered Fe3Pt has been investigated by magnetization and X-ray diffraction measurements. We confirmed that a new type of face-centered tetragonal (FCT) martensite phase appears below 60 K in Fe3Pt with a degree of order S = 0.88. The tetragonality c/a gradually increases with decreasing temperature, and is approximately 1.005 at 10 K. This is in contrast to the tetragonality c/a < 1 generally observed in the FCT martensite with a degree of order less than 0.8. The spontaneous magnetization increases in association with the transformation.

KW - Invar alloys

KW - Magnetic measurements

KW - Phase transitions

KW - TEM

KW - Transmission electron microscopy

KW - X-ray diffraction

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