Character of transformations in Fe-Co system

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Physical-Technical Inst, Izhevsk, Russia [1 ]
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Mater Sci Eng A Struct Mater Prop Microstruct Process | / 1-2卷 / 238-244期
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Heat treatment - Order disorder transitions - Separation;
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摘要：
The phase transformations of Fe-(35-65%)Co alloys and `Permendur' (48.4%Fe-49.8%Co-1.8wt.%V) have been studied. It was found that the B2 phase is formed solely during heat treatment in air atmosphere and in a thin surface layer, but not in the bulk and not in vacuum. At high temperatures, the Fe-Co alloys separate into the pure components, but also only in a thin surface layer. A `550 °C anomaly' arises as a result of changes of magnetic configuration in the alloys. The causes and consequences of these transformations in Fe-Co alloys are analyzed.
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