采用球磨法制备晶粒尺寸为0.3 μm的亚微米晶Al-3％Mn(质量分数)合金.Al-3％Mn合金在室温下轧制时,表现为极高的延展性(超过2500％).采用透射电镜(TEM)观察球磨态和冷轧态的纯铝和Al-3％Mn合金组织；采用X射线衍射对比分析组成,发现连续塑性变形机制包括位错滑移和晶界滑动,同时还有动态回复和再结晶,而动态再结晶是大塑性变形的主要控制机制.
Submicrometer-grained (SMG) Al-3％Mn (mass fraction) alloy specimens with initial grain size of～0.3 μm were produced by ball milling for 3 h.The Al-3％Mn specimens which were cold rolled with a strain rate of 1 × 10-3- 1 × 10-2 s-1 at room temperature show high extensibility to failure more than 2500％.Microstructures of pure Al and Al-3％Mn alloy at as-milled and cold-rolled state were examined using X-ray diffraction and transmission electron microscopy (TEM).Based on the microstructure analysis,it is established that the mechanism of the continued plastic deformation in SMG Al-3％Mn alloy consists of dislocation slip,grain boundary sliding companied by dynamic recovery and recrystallization,and dynamic recrystallization is a main control factor of the large plastic deformation.
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