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Unformatted text preview: size bw the solvent and solute atoms produces distortion of lattice and hinders dislocation movement. Increases y and decreases ductility. Harder than pure. Strain hardening-ductile metal becomes harder and stronger as it is plastically deformed (coat hanger). Cold working-deformation occurs at low temp compared to melting. Dislocation density increases with cold work. Resistance to dislocation motion by other dislocations increases. Precipitation hardening-precipitates=complex crystal structure,wrongly oriented slip planes and distortion in atomic arrangement. Generates strain field in the lattice and hinders dislocation motion-stronger. Ductile fracture-necking-void formation-void linking-crack propagation-fracture. Void forms where 3 grains meet-triple point. Brittle-little plastic deformation....
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- Spring '07