The illustration below shows the extra half planes of two edge dislocations in a crystal subjected to a tensile load. Assume that the load is less than the critical stress needed for a dislocation to

The illustration below shows the extra half planes of two edge dislocations in a crystal subjected to a tensile load. Assume that the load is less than the critical stress needed for a dislocation to glide and the defects can move only by climb i) Sketch the positions of the dislocations after they climb (but have not yet left the crystal). ii) When the dislocations leave the crystal, how has its shape changed? iii) How many vacancies must be generated for the dislocations to climb out of the crystal (assume an interatomic spacing of a and an atomic volume of a3) iv) In equilibrium, does the climb of the dislocation through the crystal increase the volume of the sample?

 
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