CRYSTAL ORIENTATION AND YIELD STRENGTH OF PURE MAGNESIUM CONTINUOUSLYCAST WITH A HEATED MOLD

Crystal orientation and yield strength are studied for a magnesium ing ot continuously cast by the OCC process. The ingot consists of elongat ed subgrains parallel to the solidification direction. The disorientat ion angles between neighboring subgrains are about 2 degrees. Overall orientations of the subgrains in the ingot are well aligned and the in got has a monocrystal-like structure. Anisotropy of plastic deformatio n is observed for specimens cut from the ingot, which is similar to th at in magnesium monocrystals. It is found that the presence of subboun daries increases the critical resolved shear stresses for the basal-sl ip system.