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Unformatted text preview: MSE C113 Mechanical Behavior of Materials Professor Ritchie Midterm Exam 1 Solutions Problem 1 (20 Points) a) 6 Points Acceptable answers include: T/T m < 0.3 → Twinning, slip glide 0.3 < T/T m < 0.7 → Climb and glide, grain boundary sliding T/T m > 0.7 → Diffusional flow (bulk and boundary) - Dislocation plasticity o T/T m < 0.3 and stresses above the yield stress o T/T m = 0/3-0.6 at stresses below the yield stress as creep - Diffusional plasticity o T/T m > 0.6 and stresses below the yield stress as creep Grain boundary diffusion (low T’s within T/T m > 0.6) Bulk diffusion (high T’s within T/T m > 0.6) b) 12 Points Mixed Mixed Mixed Mixed Edge Edge Screw Screw The valid cross slip plane is plane 1 because in order for the dislocation to propagate, the plane that the dislocation is cross-slipping into must contain the burgers vector in order for it to continue dislocation movement The portion that can cross slip into plane 1 is the screw dislocation because it moves...
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- Spring '09