Summary:Precipitate Hardening effect The hardening effect of precipitates can arise in many ways as below: Coherency Strengthening:due to elastic coherency strains surrounding the particle Modulus Hardening:due to difference in elastic moduli of the matrix and particle Lattice Resistance:the dislocation may face an increased lattice friction stress in the precipitate. Chemical Strengthening:arises from additional interface created on shearing Stacking-fault Strengthening:due to difference between stacking-fault energy between particle and matrix when these are both FCC or HCP(when dislocations are split into partials) Order Strengthening:due to additional work required to create an APB in case of dislocations passing through precipitates which have an ordered latticeSummary: Precipitate Hardening effect 5 The hardening effect of precipitates can arise in many ways as below: q Coherency Strengthening: due to elastic coherency strains surrounding the particle q Modulus Hardening: due to difference in elastic moduli of the matrix and particle q Lattice Resistance: the dislocation may face an increased lattice friction stress in the precipitate. q Chemical Strengthening: arises from additional interface created on shearing q Stacking-fault Strengthening: due to difference between stacking-fault energy between particle and matrix when these are both FCC or HCP (when dislocations are split into partials) q Order Strengthening: due to additional work required to create an APB in case of dislocations passing through precipitates which have an ordered lattice