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采用大变形异步叠轧并结合退火处理制备出了超细晶铜材.讨论了大变形异步叠轧的搓轧区、界面以及变形量等技术特征,测试了超细晶铜材的组织及性能.结果表明,搓轧区的存在促进了界面的复合和晶粒的细化;纯铜经过室温六道次AARB变形(累积真心变4.01)后,包含有许多亚结构,之后再经过220℃/35min退火处理,亚结构消失,获得了平均晶粒大小为200nm、抗拉强度、屈服强度分别为424.5MPa,323.1MPa、电导率为76.3 MS·m-1的高强高导超细品铜;晶界面积的增加提高了超细晶铜的显微硬度;超细晶粒的变形不均匀性小和应力集中小,使得超细晶铜的塑性好、强度高;超细晶铜材的塑性变形机制受晶界行为控制.

参考文献

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