Abstract
The microstructure of the C36 Laves phase MgNi2 in a two-phase Ni-15 at. pct Mg alloy was studied using electron microscopy. Both intrinsic and extrinsic stacking faults were found on the basal plane. The displacement vectors of the faults and Burgers vectors of partial dislocations either lying on the basal faults or bounding each side of the faults were analyzed using high-resolution transmission electron microscopy (TEM). Nonbasal faults were found on the pyramidal planes {1011} and {1012} and the prismatic plane {1010}, all connected to basal faults. The displacement vector of the pyramidal faults was determined to be 1/12 〈4043〉. The microstructure was also studied after room-temperature compression, and nonbasal slip was found to be the major deformation mode.
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