(a) If a vacancy disc forms on a basal plane of a hexagonal metal close?packed metal, what stacking sequence of basal planes would result across the disc?
(b) Why would the strain energy of the resulting stacking fault be very high?
(c) Explain how a simple shear along the basal plane, equal to a Cheekily partial, could eliminatethe high energy stacking fault and replace it with one of lower energy.
(d) What then would be the stacking arrangement of the basal planes at the fault?
(e) Is the result in (d) unique or are there several basic probabilites? Explain.
(c) Two sets of pockets, B and C, are shown in the above model of a plane in an A orientation,which will be assumed to represent the upper of the A orientation planes. The high energystacking fault can be converted into one of lower energy by passing a Shockley partialdislocation across the vacancy disc that shifts the lower plane, so that its atoms move into Bpockets. In effect this partial dislocation moves the atoms of the lower plane through the vectorAB shown in the above sketch.
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