【摘要】 在叠轧等效应变为4.0的条件下得到了平均晶粒为0.5μm的Al-1%Mg合金超细晶组织;在平面深变形条件下,形成了含有大量位错的亚晶组织,大角度晶界是由于几何深变形而形成的;在热作用下,合金位错密度降低,亚晶减少,晶粒变大,在退火温度高于200℃时晶粒变化明显,低于200℃,晶粒生长比较缓慢;随着退火温度的升高,合金组织发生静态回复与静态再结晶过程,静态回复是通过位错的滑移和攀移而进行的。合金在300℃已经发生了明显的再结晶,这种再结晶是通过亚晶合并而进行的。更多还原

【Abstract】 Ultrafine-grained Al-1%Mg alloy in an average scale of 0.5 μm was produced by accumulative roll-bonding process at an equivalent plastic strain of 4.0.Under plane deformation conditions,a large number of subgrains containing many dislocations forms,and high angle grain boundaries occur due to geometric severe plastic deformation.Under thermal actions,dislocation density and subgrain in the alloy decrease,and grain size becomes larger.When the annealing temperature is higher than 200℃,grain growth takes place sharply.While the annealing temperature is lower than 200℃,grain grows slowly.With annealing temperature gradually increasing,static recovery and static recrystallization appear in the alloy.Static recovery is carried out by dislocation slipping and climbing.Recrystallization takes place obviously in the alloy at 300℃,which is proceeded by subgrain boundary merging and growing.更多还原