ENGR 240 - 10.19.07

ENGR 240 - 10.19.07 - ENGR 240 October 19, 2007 Plastic...

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ENGR 240 – October 19, 2007 Plastic Deformation of Polycrystalline Materials o Random orientation of many crystals o Slip occurs along most favorable planes and directions o Orientations do not align grain to grain in polycrystalline materials o One grain may be favorably oriented but it cannot deform because adjacent grains are not oriented correctly and restrict motion Will not deform until adjacent crystals are capable of slip o Polycrystalline metals are stronger than single crystals Strengthening Mechanisms in Metals o Plastic deformation – occurs by slip o Strengthening will occur when plastic deformation/slip is restricted o Solid Solution Strengthening Add atoms of a solute which impose lattice strains on the host atom’s structure Occurs because they are not the same size Small solute atoms tensile strains Large solute atoms compressive strains Strains interact with the slip by restricting it Ductility decreases
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ENGR 240 - 10.19.07 - ENGR 240 October 19, 2007 Plastic...

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