1.a) Explain the concept of dislocation energy. b) What are the sources of the energy, and what is the expression for energy per unit length? c) How does this affect dislocation reactions, such as the splitting of an a/2<110> dislocation in the FCC lattice to two partials? 2.a) The Burgers vector (->b) is the shortest repeat distance in the crystal so that its energy is as low as possible. What would be the magnitude of a perfect dislocation in an alpha-polonium crystal (lattice constant: 3.359 Angstrom)? b) Suppose this dislocation is present in one of the slip systems in a cylindrical pure alpha-polonium single crystal. If the dislocation moves under the action of stress, would there be any resistance toward its movement? What should be the applied shear stress to move (for part-b, no quantitative calculation needed; just the concept needs to be presented).
1.a) Explain the concept of dislocation energy.
b) What are the sources of the energy, and what is the expression for energy per unit length? c) How does this affect dislocation reactions, such as the splitting of an a/2<110> dislocation in the FCC lattice to two partials?
2.a) The Burgers
b) Suppose this dislocation is present in one of the slip systems in a cylindrical pure alpha-polonium single crystal. If the dislocation moves under the action of stress, would there be any resistance toward its movement?
What should be the applied shear stress to move (for part-b, no quantitative calculation needed; just the concept needs to be presented).
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