material science question pls answer all

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material science question pls answer all
A. For applications involving metal forming, which metallic crystal structure will you recommend and why? B. A cubic metal, with atom radius, r=0.77 A, exhibits plastic deformation by slip along a family of direction <111>. Determine the planar packing density for its most favorable plane. C. A stress is applied to a single crystal of a pure cubic metal. The sketches below indicate the orientation of the stress and the slip direction with respect to the crystallographic axes. i) Identify the slip system indicated in the sketches, ii) For which crystal structure are the sketches the most favorable slip system? iii) For which of the slip planes shown below (A, B, or C), will slip not occur in the indicated direction, regardless of the magnitude of the stress? Explain. slip direction +N N+ slip direction slip direction X A B с