Ultrahigh strength and high ductility of bulk nanocrystalline copper
Ultrahigh strength and high ductility of bulk nanocrystalline copper
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DOI：
10.1063/1.2034122
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发表时间：
2005-08
影响因子：
4
通讯作者：
K. Youssef;R. Scattergood;K. Murty;J. Horton;C. Koch
中科院分区：
文献类型：
--
作者：
K. Youssef;R. Scattergood;K. Murty;J. Horton;C. Koch
我们合成了无人工制品的块体纳米晶铜样品，具有窄的晶粒尺寸分布（平均晶粒尺寸为23nm），其拉伸屈服强度比常规粗晶铜高约11倍，同时保持14%的均匀拉伸伸长率。原位动态应变透射电子显微镜观察的纳米晶铜，这表明个别的位错运动和位错堆积。这表明位错控制的变形机制，允许观察到的高应变硬化。在单个纳米颗粒中观察到陷阱位错。
We have synthesized artifact-free bulk nanocrystalline copper samples with a narrow grain size distribution (mean grain size of 23nm) that exhibited tensile yield strength about 11 times higher than that of conventional coarse-grained copper, while retaining a 14% uniform tensile elongation. In situ dynamic straining transmission electron microscope observations of the nanocrystalline copper are also reported, which showed individual dislocation motion and dislocation pile-ups. This suggests a dislocation-controlled deformation mechanism that allows for the high strain hardening observed. Trapped dislocations are observed in the individual nanograins.