Work Hardening Notes 10

Work Hardening Notes 10 - ribbon and consequently need a...

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Deformation in Single Crystals Stage III: Cross-slip stage (“parabolic hardening”) DifFcult to occur at low levels of stress Operation aided by high temperatures (tau increase with decrease in temperature) Highly dependent on stacking fault energy of the material Low S±E materials (brasses, bronzes, austenitic steels) - have wider stacking fault
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Unformatted text preview: ribbon and consequently need a higher activation energy for cross-slip (also screw dislocations have a difFcult time chaning their slip plane, the dislocation density is high and the transition between Stage II and Stage III is retarded. Polycrystals offen go straight into stage III...
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