Abstract

Electron microscopy observations show that in the ordered alloy Ni 3V, perfect 1/ 2[112] dislocations are dissociated into three 1/ 6[112] partial dislocations bounding an intrinsic-extrinsic pure stacking fault pair (i.e. without any wrong first neighbour bonds); from this an evaluation of stacking fault energies can be deduced. Furthermore, such pairs should extend under stress and produce 1/ 6[112] partials as the slip dislocations in this crystal structure.

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