Method of making permanent magnet of Mn-Al-C alloy.

摘要

A manganese-aiuminium-carbon alloy magnet is produced by subjecting a polycrystalline Mn-Al-C alloy magnet having a specified direction to easy magnetization to compressive working in that direction at a temperature of 550 to 780 DEG C. The degree of compressive working is equivalent to a logarithmic strain of </= -0.1 and the compression at least up to the logarithmic strain of -0.1 being free compression.
<??>The resulting magnet is magnetically anisotropic in thre-imensional terms, but is magnetically isotropic in two-dimensional terms (in planes including the specified direction).