THE CORRELATION BETWEEN THE COERCIVITY AND THE MECHANICAL-PROPERTIES OF SINTERED RARE-EARTH IRON-BORON MAGNETS

Experimental proof of the correlation between the intrinsic coercivity , and the elastic and strength properties of sintered Pr-Fe-Co-B, Nd-F e-Ti-B and Nd-RE-Fe-Co-M-B (RE = Dy, Pr or Tb; M = Al, Cr, Nb, (W, Re) or Zr) magnets has been examined. It is found that there exists stron g correlation between the intrinsic coercivity (i)H(c) and the mechani cal properties; the increase in (i)H(c) results in increases in the im pact strength, ultimate tensile stress, bending strength and fracture toughness and in decreases in the elastic constant, Vickers hardness a nd tensile strength.