采用重度冷轧及退火工艺制备超细晶工业纯铝,利用透射电镜和显微硬度实验对比研究了室温轧制和深冷轧制（液氮）及退火工艺所得到的超细晶工业纯铝组织特性和硬度。结果表明：深冷轧制细化晶粒的能力高于室温轧制,前者等轴状超细晶粒尺寸约为0.5μm,后者则约为1μm;深冷轧制试样的硬度值均高于对应状态下的室温轧制试样,温度低于200℃退火时,硬度值变化平缓,显微组织处于回复阶段;高于200℃退火时,硬度值迅速下降后趋于定值,与原始退火态相当,显微组织处于再结晶阶段。
Ultra-fine grained commercial purity aluminum was produced by severe cold rolling and annealing.Microstructural characteristics and microhardness of ultra-fine grained commercial purity aluminum were investigated by means of transmission electron microscopy（TEM） and Vickers hardness test under cold rolling and cryo-rolling,respectively,and annealing.Fine grain strengthening effect of the cryo-rolled and annealed commercial purity aluminum with 0.5 μm ultra-fine grains is superior to that of the room temperature rolled and annealed with 1 μm ultra-fine grains.Rolling at liquid nitrogen temperature results in higher hardness than at room temperature under the same condition.When annealed below 200 ℃,hardness changes slightly,while annealed above 200 ℃,ultra-fine grained commercial purity aluminum structure actually is recrystallized rather than recovered and its hardness decreases rapidly,and then tends to be stable value.
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