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A2. (a) Discuss twinning systems betweenZnand Ti crystals, respectively, (b) derive the shear after mechanical twinning for Mo and give the value of shear. (c) Considering the following Burgers vector of2a[110]in Cu crystal, show the Burgers vector of two partial dislocations in a lattice structure and explain the difference in the atom position between the parent matrix and the stacking fault area due to the formation of two partial dislocations in terms of atom position.(6+8+6=20)

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