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A new type of FCT martensite phase in single-crystalline Fe3Pt Invar alloy |
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| Authors: | Masataka YamamotoSayaka Sekida Takashi Fukuda Tomoyuki KakeshitaKohki Takahashi Keiichi Koyama Hiroyuki Nojiri |
| Affiliation: | a Department of Materials Science and Engineering, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan b High-Field Laboratory for Superconducting Materials, Institute for Materials Research, Tohoku University, 2-1-1 Sendai Katahira, Aoba-ku, Sendai, Miyagi 980-8577, Japan |
| 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 Phase transitions Magnetic measurements Transmission electron microscopy TEM X-ray diffraction |
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