Beta-FeSi2 phase formation through phase transition の変更点

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|[[Fe-Si based alloys for thermoelectronic materials]]|
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*Formation of beta-FeSi2 intermetallic compounds [#r10548de]
#author("2020-12-20T10:39:33+09:00","","")

#ref(http://t-nagase.sakura.ne.jp/pict/20151005/08-01-TTT-Cu.jpg,left,nowrap,photo)
''Figure 1''~
''TTT Diagram of the eutectoid reaction of a-Fe2Si5 (a-Fe2Si5 -> b-FeSi2 + Si) [2].''~

#ref(http://t-nagase.sakura.ne.jp/pict/20151005/08-02-TTT-MnCu.jpg,left,nowrap,photo)
''Figure 2''
''TTT Diagram of the eutectoid reaction of a-Fe2Si5 with 1.0 at.% Mn (a-Fe2Si5 -> b-FeSi2 + Si) [2]''~

#ref(http://t-nagase.sakura.ne.jp/pict/20151005/08-02-Periodic.jpg,left,nowrap,photo)
''Figure 3''~
''Elements for the accelerating the eutectoid reaction of a-Fe2Si5 (a-Fe2Si5 -> b-FeSi2 + Si) [3]''~
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Beta-FeSi2 with high thermoelectric properties cannot be directly obtained from the thermal melt. The extremely long annealing is necesary for obtaining b-FeSi2 phase. The b-FeSi2 phase formation can be accelerated by small amount of Cu addition, especially for the eutectoid reaction of a-Fe2Si5 (a-Fe2Si5 -> b-FeSi2+ Si) [1]. We firstly constructed TTT diagram of the eutectoid reaction (a-Fe2Si5 -> b-FeSi2+ Si) for the development of Fe-Si based thermoelectric materials [2]. The eutectoid reaction of a-Fe2Si5 (a-Fe2Si5 -> b-FeSi2+ Si) can be accelerated by the small amount of Cu, Pd and Au addition, while the phase transformation rate is not affected by Ag and Pt addition [3].~
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REFERENCES~
[1] I. Yamauchi, A. Suganuma, T. Okamoto and I. Ohnaka: J. Mater. Sci. 32, (1997) 4603., http://dx.doi.org/10.1023/A:1004323930521~
[2] I. Yamauchi, T. Nagase and I. Ohnaka: J. of alloys and compounds, 292, 181-190 (1999)., http://dx.doi.org/10.1016/S0925-8388(99)00155-3~
[3] I. Yamauchi, T. Nagase and I. Ohnaka: J. of Mater. Sci. 37, 1429-1435 (2002)., http://dx.doi.org/10.1023/A:1014545302508~