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Lecture Strengthening Mechanism Metals 2014

CHAPTER 7 DISLOCATIONS AND Strengthening MECHANISMS ISSUES TO PLASTIC DEFORMATION and DISLOCATIONS * Dislocation motion * Slip in: -single crystals -polycrystalline materials * Dislocation motion and strength HOW TO INCREASE MATERIALS STRENGTH? * Grain size reduction * Solid-solution Strengthening * Strain hardening HEATING and STRENGTH * Recovery * Recrystallization * Grain Growth The Strength of Perfect Crystal s=Ee 2s=E( )/ ro s = E/(8 -15) All Metals have yield strength far below predicted perfect crystal values!

All metals have yield strength far below ... • Ways of measuring dislocation density: or Result of Cold Work d = N A ... dislocation pit Υ 40mm • Yield strength (ς y) increases. • Ductility (% EL or %AR) decreases. Impact of Cold Work Example: the influence of cold work on the stress-strain behavior of low-carbon steel Initial wire 1st ...

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  Metal, Measuring, Ductility

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