| 块体择优取向纳米孪晶铜的优异抗疲劳裂纹扩展性能（英文） |
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| 作者姓名： | 赵瑞珂 赵怀智 卢磊 |
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| 作者单位： | 1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences;2. School of Materials Science and Engineering, University of Science and Technology of China;3. Institute of Fluid Physics, China Academy of Engineering Physics |
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| 摘 要： | 本文研究了具有不同微观结构(如晶粒尺寸和孪晶厚度)的块体择优取向纳米孪晶Cu(NT-Cu)的疲劳裂纹扩展(FCG)特性,着重讨论了裂纹闭合效应和近门槛值区域的本征FCG阻力.与传统无孪晶的粗晶Cu相比, NT-Cu样品表现出显著提升的疲劳裂纹扩展抗力(有效门槛值应力强度因子范围,?Kth,eff).这种增强的裂纹扩展阻力与NT-Cu中特殊的跨孪晶位错滑移模式有关.该位错主导着NT-Cu裂纹尖端的循环变形,有效降低了裂纹尖端循环滑移不可逆水平,从而提高了纳米孪晶材料损伤扩展的本征抗力.
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