Shear softening of grain boundaries in nanocrystalline Pd
Shear softening of grain boundaries in nanocrystalline Pd
复制标题
纳米晶钯晶界的剪切软化
DOI：
10.1016/j.actamat.2010.11.016
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发表时间：
2011
期刊：
影响因子：
9.4
通讯作者：
R. Birringer
中科院分区：
文献类型：
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作者：
M. Grewer;J. Markmann;R. Karos;W. Arnold;R. Birringer
纳米晶材料是晶粒尺寸L为10nm量级的多晶。与传统的多晶不同，晶界核心区域的物质体积分数往往接近纳米尺寸晶粒内部的物质份额，因为它的比例为 1/L。纳米晶钯室温晶粒生长的发现使得监测微观结构的粗化并同时甚至原位测量性能的伴随演变成为可能。根据所得到的性能缩放行为，我们使用超声波技术推导出界面弹性模量。特别是，我们发现晶界有 30% 的剪切软化，并讨论了其与块状金属玻璃中观察到的剪切软化的关系。
Nanocrystalline materials are polycrystals with grain sizes L of the order of 10nm. Unlike conventional polycrystals, the volume fraction of matter in the core region of grain boundaries tends to approach the share of matter in the interior of the nanometer-sized grains since it scales as 1/L. The discovery of room-temperature grain growth in nanocrystalline Pd makes it possible to monitor the coarsening of the microstructure and to measure simultaneously, or even in situ, the concomitant evolution of properties. From the resulting scaling behavior of properties we deduced interface elastic moduli, using ultrasonic techniques. In particular, we find a 30% shear softening of grain boundaries and discuss its relation to the shear softening observed in bulk metallic glasses.
影响因子：
38.3
作者：
通讯作者：
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