MAT E202 Lecture Notes - Lecture 21: Sintering, Work Hardening, Formability
6 Mar 2017
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Liquid metal or alloy is poured into a mold. Liquid metal is poured into a bulk form and then hot and/or cold worked. Metal powders are pressed in a die and sintered (melted below mp) They can be greatly strengthened by alloying with other metals. In both cases, the dislocation is stabilized by reducing the elastic strain and therefore harder to move. The solute atoms cause local lattice distortion and blocks dislocation movement. Dislocation does not want to move to a region where there are no solute atoms. To carry out precipitation hardening i. ii. iii. If t2 is too high (over aging), then precipitate coarsens and is less effective. This fine precipitate blocks dislocation movement in the alpha phase. When cold working a metal or alloy, number of dislocations are increased which become entangled. Light, good electrical conductivity, good thermal conductivity, good corrosion resistance (fluke)
