Isamu Yamauchi1, Hajime Ohata2 and Itsuo Ohnaka3
1Department of Materials Science and Engineering, Graduate School of Engineering, Osaka University, Osaka 565
The formation behavior of a β-phase in the newly proposed Fe2Si5-B alloy with a small amount of Cu and their thermo-electric power were examined. The results are summarized as follows: The as-solidified structure of the Fe2Si5 based alloys with B and Cu was found to be mostly the α single phase by conventional X-ray diffractometry while a few B-rich and ε phase were observed by SEM. The β-phase formation rate in a conventional (FeSi2)99B1 alloy was increased by the addition of Cu, but still quite a long annealing period was necessary to attain the complete formation of β-phase. In the case of the Cu-added (Fe2Si5)99B1 alloy, the β formation was completed by annealing at 1073 K for 1.8{×}102 s. It is 100 times shorter than that in the binary Fe2Si5. The thermoelectric power of the newly proposed (Fe2Si5)99B1 alloy elucidated to be comparable with the conventional (Fe2Si5)99B1 alloy. The Si phase retained in the final state also found to cause no deterioration on the thermoelectric power.
(Received March 21, 1997)
thermoelectric power, iron-silicon, solidification, transformation
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