Abstract
A lamellar phase is reported in a Zr-free Sm(Co0.45Fe0.15Cu0.4)5 alloy after it had been solutionized and aged at 650°C for 50h. The lamellar phase has a composition of Sm(Co,Fe,Cu)3 with a Be3Nb structure type, which is similar to that in the fully heat-treated Sm(Co,Cu,Fe,Zr)z 2:17 magnets containing Zr. This observation is contrary to the traditional thinking that associates the lamellar phase to the presence of Zr. This present result provides additional information that can be used to elaborate the origin of coercivity in precipitation Sm-Co magnets.
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