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