文档介绍：第六章无多型性转变合金的淬火与时效(2)(固溶处理)、时效温度、力学性能的变化关系IIIGenerally,-Cualloys,therecanbemorethan4peaksresultedfromtheformationofGP,’’,’and’.However,thereisalsothecasewheredifferentpeakscannotbediscriminated,:位错与脱溶质点间的相互作用Orowan机制:位错绕过机制切割机制:短程作用(界面,反相畴)、长程作用Interpretation:Microstructurecontainsanumberofheterogeneities,whichcancontributebothtolocalizationofplasticflow,,theheterogeneitiesincludeintermetallicparticles,quenchinducedintergranularandintragranularprecipitates,andprecipitate-:intermetallicdecohesion,:位错绕过机制位错环绕机制(Orowan机制)强化理论Dislocationtheory:K=1forscrew,K=1-forknife,ispoissoncoefficient,Gisshearmodule,bburgersvector,r0radiusofdislocation,Rhalfofthedistancebetweenparticles,fvolumefraction,(以10b为界限,小于10b为短程作用;大于10b为长程作用)-----短程作用--------(1)界面能增加导致的额外切应力计算:新增面积:新增能量:ount,estoforallparticlesinaunitarea.(2)反相畴界能增加导致的附加切应力机算:orderedparticles可见短程作用中,增加的切应力具有以下形式Parabolic-type-----长程作用-----(3)长程作用计算:两应变场的相互作用whereEisYoung’smodule,,afunctionofthemismatch-rangeeffect,thenthelong----强化与沉淀粒子尺寸的关系质点半径强化增量开始阶段:粒子小、共格,易被切割后阶段:大、半共格或非共格,绕过Inrealalloys,largervolumeandfinerparticles;strainfield