Terunobu Miyazaki1, Mikio Takahashi2 and Xingbo Yang1
1Faculty of Engineering, Tohoku University, Sendai
The formation of compounds in (Fe1-xCox)1-yPry and (Fe1-xCox)1-ySmy ternary alloys rapidly-quenched from the melt at disk surface velocities ranging from 4.3 to 41.9 m/s has been investigated by X-ray diffraction analysis. The following types of compounds were found to be formed: TbCu7-type: 0≤x≤0.6 in (Fe1-xCox)0.89Pr0.11 and 0≤x≤1.0 in (Fe1-xCox)0.89Sm0.11; CaCu5-type: 0.6≤x≤1.0 in (Fe1-xCox)0.83Pr0.17 and (Fe1-xCox)0.83Sm0.17; and Gd2Co7-type: 0.6≤x≤1.0 in (Fe1-xCox)0.78Pr0.22 and 0.7≤x≤1.0 in (Fe1-xCox)0.78Sm0.22. Both CaCu5-type and Gd2Co7-type ternary compounds do not exist in their equilibrium state. In the Fe-Co-Pr system, PuNi3- and MgCu2-types compounds were formed with a Th2Zn17-type stable compound at the compositions x=0.3 and x=0.4.
formation of metastable compound, rapid-quenching, iron, cobalt, samarium, praseodymium
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