Load, N (12) Nickel (Ni) is to be diffused into pure copper at 675 C. If the surface concentration is maintained to be 0.2 wt% Ni, what will be the concentration 2 mm from the surface after 25h? The diffusion coefficient for nickel in copper at 675 C is 1.9x10-11 m/s. Z erf(z) 0.50 0.5205 0.55 0.5633 0.60 0.6039 0.65 0.6420 0.70 0.6778 0.75 0.7112 0.80 0.7421 0.85 0.7707 0.90 0.7970 0.95 0.8209 1.00 0.8427 B4 (19) A specimen of magnesium having a cross section area of 50 mm mm and initial length of 100 mm is deformed in tension. Using load-elongation (plot on the left) data provided: a) Plot engineering stress versus engineering strain (plot on the right) b) Determine modulus of elasticity c) Determine yield strength at a strain offset of 0.002 d) Calculate modulus of resilience e) What is the plastic deformation at the failure? Note: Clearly show on the plot how you determined modulus, yield point, and ductility. 14000 12000 10000 8000F 6000 4000 2000 Stress, MPa 280 240 200 160 120 80 40 0 0 0 1 2 3 4 5 6 7 8 9 10 11 12 0 Elongation, mm 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.10 0.11 0.12 Strain