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Unformatted text preview: HOMEWORK 5 PART A. DEFINITIONS/NOMENCLATURE (5 POINTS - 1 POINT EACH) 1. The energy of a dislocation is proportional to the square of the Burges vector, b 2 . 2. The motion of an edge dislocation that occurs when vacancies migrate to the extra half plane of atoms is referred to as climb . 3. A two-dimensional defect composed of a regular array of edge dislocations is referred to as a(n) tilt boundary . 4. The increase in the flow stress resulting from plastic deformation is usually called strain hardening, or work hardening or dislocation strengthening . 5. The Burgers vector of a screw dislocation is parallel to the dislocation line. PART B. CIRCLE THE APPROPRIATE ANSWER (10 POINTS - 1 POINT EACH) 1. Increasing the grain size decreases the strength of a metal or alloy. 2. When r solute < r solvent the tendency is for the solute to segregate to the compression side of the dislocation. 3. Increasing the dislocation density increases the strength of a metal or alloy. 4. Because it is a thermally activated process, the probability of dislocation climb increases as temperature increases....
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- Fall '08