Experimental and theoretical studies on phase separations in the Fe-Al-Co ordering alloy system
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Phase separations in iron-rich Fe-Al-Co ternary alloys were investigated by means of transmission electron microscopy, differential thermal analysis and magnetization measurement. Two kinds of phase separations have been found at 923 K; A2+B2 and B2+B2*. The former occurs in a tongue-shaped composition region ranging from Fe-12 at % Al-15 at % Co to Fe-35 at % Al-45 at % Co and the latter appears in the small region bordering on the Fe-Al binary side of the A2+B2 field. These two-phase fields have theoretically been evaluated on the basis of the so-called Bragg-Williams-Gorsky model taking account of not only chemical but also magnetic interactions. The magnetic ordering accounts for the expansion of the A2+B2 coexistent region. In the measurement of magnetic properties, large increases in coercive force, Hc, and residual magnetic flux density, Br, were observed in the two-phase microstructures.
KeywordsMicrostructure Transmission Electron Microscopy Magnetic Property Thermal Analysis Phase Separation
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- 1.G. Inden and W. Pitsh, Z. Metallkde 63 (1972) 253.Google Scholar
- 2.G. Schlatte and W. Pitsh, ibid. 66 (1975) 660.Google Scholar
- 5.P. R. Swann, W. R. Duff and R. M. Fisher, Metall Trans. 3 (1972) 409.Google Scholar
- 10.G. Inden, Z. Metallkde 66 (1975) 577; 648.Google Scholar
- 12.T. Kozakai, P. Z. Zhao and T. Miyazaki, in “Proceedings of the 1st Japan International SAMPE Symposium” 28 November–1 December 1989, Chiba, p. 139.Google Scholar
- 18.G. Inden, in “Materials Science and Technology”, Vol. 5, edited by R. W. Cahn et al. (VCH Press, Weinheim, 1991) p. 497.Google Scholar
- 20.G. Inden, Physica 103B (1981) 82.Google Scholar
- 22.G. Inden and W. O. Meyer, Z. Metallkde 66 (1975) 725.Google Scholar