Permanent Magnet Properties of in situ Formed Cu-Fe Multifilamentary Composites.
HARVARD UNIV CAMBRIDGE MA GORDON MCKAY LAB
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Cu-Fe multifilamentary composites with up to 60 vol Fe were prepared in situ. Magnetic hysteresis loops were obtained at room temperature as a function of composition, cross sectional area reduction, up to 99.9996, and annealing conditions. Hci and B.Hmax increase with cross sectional area reduction and show pronounced changes on annealing. Hci 600, 520 and 380 Oe and Mr 5.6, 8.2 and 11.9 KG were measured in the smallest 30, 45 and 60 vol Fe composites, respectively, following optimal heat treatment. B.Hmax 3.2 MG.Oe was measured in both Cu-45 vol Fe and Cu-60 vol Fe with hysteresis loop squareness of 0.95. Considering the excellent mechanical and transport properties, inexpensive constituent elements and simple preparation, the in situ formed Cu-Fe composites appear to have the potential for permanent magnet applications.
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- Properties of Metals and Alloys