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通过2种不同的均匀化热处理及随后的冷轧,使一种3xxx系模型合金获得不同尺寸和分布的弥散析出相,并使铝基体含有不同含量的Mn。系统研究不同均匀化热处理组织和冷轧变形量对退火过程中模型合金的回复与再结晶行为的影响。根据实验结果,绘制出弥散析出相和再结晶过程的相互作用时间-温度-转变曲线(TTT)。TTT曲线显示固溶体中Mn的含量和弥散析出相的颗粒密度对软化行为有强烈的影响。在再结晶退火过程中或再结晶退火之前析出的高密度、细小、弥散析出相显著阻碍软化过程,并形成粗大的再结晶组织。在没有细小、稠密的弥散相影响下的再结晶退火,可以获得均匀、细小的等轴晶。而且,弥散析出相对再结晶过程的阻碍作用取决于再结晶过程的持续时间和弥散析出相的数量。在持续时间长的再结晶过程中,细小、稠密的弥散相对再结晶有着强烈的影响,而在其他情况下影响则有限。不管再结晶过程中是否受到弥散相析出的影响,在再结晶退火之前已经存在于组织中的细小、稠密的弥散相(平均尺寸0.1μm)也会导致再结晶退火之后形成粗大的再结晶组织。
Through the two different homogenization heat treatments and the subsequent cold rolling, a 3xxx series model alloy was obtained with different size and distribution of dispersed phases and the aluminum matrix with different Mn contents. The effect of different homogenization heat treatment microstructure and cold rolling deformation on the recovery and recrystallization behavior of the model alloy during annealing was studied systematically. According to the experimental results, the time-temperature-transition curve (TTT) of the interaction between the dispersed and recrystallized phases is plotted. The TTT curve shows that the content of Mn in the solid solution and the particle density of the dispersed precipitates have a strong influence on the softening behavior. The high-density, fine and dispersed precipitates precipitated during the recrystallization annealing or before the recrystallization annealing significantly obstruct the softening process and form a coarse recrystallized structure. In the absence of fine, dense dispersion under the influence of recrystallization annealing, you can get uniform, fine equiaxed. Moreover, the impediment to the relative recrystallization of the dispersive precipitation depends on the duration of the recrystallization process and the amount of dispersed precipitates. In a long-lasting recrystallization process, fine, dense dispersions have a strong effect on recrystallization, whereas in other cases the impact is limited. Regardless of whether the recrystallization process is affected by precipitation of the dispersed phase, the fine, dense dispersed phase (average size 0.1 μm) already present in the tissue prior to recrystallization annealing also results in the formation of coarse recrystallized microstructure after recrystallization annealing.