Abstract
Permanent magnets with a microstructure consisting of a cellular 2:17∕1:5 matrix and Co(Fe) inclusions were obtained via a heat treatment of cast R–Co(Fe)–Cu–Ti alloys containing less than 10 at. % R (R=Sm, Pr). Inclusions of the magnetically soft Co(Fe) phase are too large to be coupled with the hard matrix by a magnetic exchange interaction. Nevertheless, a complete magnetostatic coupling between the soft and hard components is evident from the smooth demagnetization curves. The resulting cast composite magnets show excellent mechanical strength, but moderate values of the coercivity and energy products (up to 3.3 kOe and 5.1 MG Oe, respectively).
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