THE FORMATION OF HIGH ANGLE GRAIN BOUNDARIES DURING THE PLASTIC DEFORMATION OF MAGNESIUM AND MAGNESIUM ALLOYS I. VALEYEV, R. KAIBYSHEV, O. SITDIKOV and B. SOKOLOV J. Phys. Colloques, 51 C1 (1990) C1-673-C1-677 DOI: 10.1051/jphyscol:19901107