累积叠轧焊法制备超细晶纯铝的研究

采用累积叠轧焊方法在室温下对1060纯铝进行剧烈塑性变形，并分析1060纯铝变形前后内部微观组织结构的演变和力学性能的变化。实验结果表明，随着累积叠轧道次的增加，层界面复合越来越紧密，5道次后出现母材基体的相互渗透；材料的抗拉强度和硬度得到大幅度提高，伸长率在1道次时急剧下降，然后基本保持不变；晶粒尺寸急剧细化，等效真应变为6．4的条件下得到了平均晶粒尺寸为400nm的超细晶组织。

Study on Ultra-fine Pure Aluminum Prepared by Accumulative Roll-bonding

The severe plastic deformation on 1060pure aluminum at room temperature was carried outby accumulative roll-bonding, the microstructure evolution and mechanics performance change of 1060 industry pure aluminum before and after plastic deformation were studied. The experimental results indicate that the layer interface binding is becoming tighter with rolling pass increasing, but the parent metal interpenetration appeares after five cycles. Both tensile strength and microhardness of the material enhance greatly and the elongation percentage decreases sharply at the first rolling pass, and then stable. The grain size is refined and the ultra-fine grains with a size of 40Onto are obtained while the equivalent true strain is 6.4.