Abstract
The basal slip of Mg3Cd single crystals was studied in the disordered and the ordered states. Results obtained are as follows:(1) The ordered specimens were very brittle and showed pronounced serrated flow.(2) In the disordered state CRSS depended on temperature below -78°C, while in the ordered state it scarcely depended on temperature.(3) CRSS at 20°C increased from-1.3kg/mm2 in the disordered state to-5.0kg/mm2 in the ordered state.(4) Slip lines in the disordered state were straight, coarse and distributed rather uniformly, while in the ordered state they diffused and localized.(5) In the disordered specimens dislocations arranged as pile-up arrays on the basal plane, and few dislocations on the nonbasal planes were observed. While, in the ordered specimens superlattice dislocations were observed on the basal plane where the dislocation density was low, however dislocation tangles consisting of unit dislocations on the basal and nonbasal planes were observed where the dislocation density was relatively high.
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