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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 = 0/30.6 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 crossslipping 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
 Ritchie
 Plasticity

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