Permanent Magnet Properties of in situ Formed Cu-Fe Multifilamentary Composites.

摘要

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.H)max 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.H)max = 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.