| 摘要 |
A permanent magnet formed from a powdered alloy ingot of samarium (Sm) and cobalt (Co), copper (Cu), and iron (Fe) and at least one element selected from the group consisting of zirconium (Zr), titanium (Ti), hafnium (Hf), tantalum (Ta), niobium (Nb), and vanadium (V), formed predominantly of Sm2Co17 crystals and having at least 50 volume percent columnar crystals in the macrostructure is provided. The alloy ingots having increased columnar crystals are prepared by melting the alloy composition at a temperature at least about 320 DEG C. above the melting point of the composition and casting the ingot at a casting speed faster than about 5.0 sec/kg of alloy.
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