In a cubic metallic block of 1 mm x 1 mm x 1 mm, there is only

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In a cubic metallic block of 1 mm x 1 mm x 1 mm, there is only a single circular loop of 0.2 mm radius. What is the relevant dislocation density?

b) What would be the average dislocation velocity if the singe crystal is plastically deformed at a shear strain rate of 10^-3 s^-1 and the total dislocation density is 10¹³ m^-2? Assume that the mobile dislocation density is two-third of the total dislocation density and consider the material is pure aluminum (lattice constant: 0.405 nm