异步叠轧制备超细晶铜微观组织与力学性能

Microstructure and Mechanical Properties of Ultra-fine Grained Copper Prepared by Asymmetrical Accumulative Roll-bonding(AARB)Process

采用大变形异步叠轧方法制备超细晶铜,对其微观组织和力学性能进行分析。实验结果表明,利用异步叠轧法制备超细晶材料可以达到细化晶粒的目的。大变形异步叠轧后铜的平均晶粒尺寸由50μm细化到100nm;抗拉强度达420.8MPa,为无氧纯铜抗拉强度的1.82倍;屈强比为0.76;延伸率由原始的44%下降到7.2%,且显微硬度显著增加。

Ultra-fine grained copper is prepared by asymmetrical accumulative roll-bonding(AARB)process with its microstructure and mechanical properties investigated.Experimental results show that it is feasible to fabricate ultra-fine-grained materials using AARB.The average size of crystalline grain is fining from 50 μm to 100 nm after AARB;ultimate strength of the ultra-fine grained copper is increased to 420.8 MPa which is 1.82 times of pure copper;the coefficient of elongation drops from 44% to 7.2% and original and micro-hardness increase obviously.