Abstract
Effects of equal-channel angular pressing with controlled back pressure (ECAP-BP) and subsequent upsetting on the formation of the texture, magnetic properties, and changes in the microstructure of R-Fe-B-Cu (17–20 at. % R, R = Pr, Nd) alloys have been investigated. It has been shown that, under the action of ECAP-BP at 470°C, a high coercive force H c arises and a diametral texture is formed in the Pr-Fe-B-Cu alloys. Application of hot compression to alloys processed by ECAP-BP increases the degree of texture if the compression is applied in the direction of the initial texture axis or reorientes the texture axis in the direction of compression if the compression is applied in the direction perpendicular to the initial texture. It has been established that to obtain a high level of magnetic hysteresis properties in the Nd-Fe-B-Cu alloys, the combined hot deformation of these alloys should be carried out at temperatures above 500°C.
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