Size dependence of fatigue damage in sub-micrometer single crystal gold
Size dependence of fatigue damage in sub-micrometer single crystal gold
复制标题
DOI：
10.1016/j.msea.2014.09.017
复制
发表时间：
2014-11
期刊：
影响因子：
6.4
通讯作者：
H. Fang;H. Fang;Ryosuke Shiohara;T. Sumigawa;T. Kitamura
中科院分区：
文献类型：
--
作者：
H. Fang;H. Fang;Ryosuke Shiohara;T. Sumigawa;T. Kitamura
在疲劳过程中，微米级和亚微米级的金属构件没有足够的空间形成持久滑移带（PSB）结构，从而在大块金属中产生几个微米级的挤压/侵入。通过对不同尺寸的单晶金悬臂梁的共振疲劳实验，研究了该尺度下的疲劳行为特征。所有试样的悬臂梁表面均形成挤压/压入疲劳损伤。挤压/侵入的宽度随着悬臂梁的尺寸而减小，从数百纳米到数十纳米，这比块体组件小得多。滑动痕迹的形成具有一定的空间周期性。形成挤压/侵入的解析剪切应力强烈依赖于试样尺寸，并且远高于本体中的剪切应力。
In fatigue, micrometer and sub-micrometer metal components do not have sufficient space to form persistent slip band (PSB) structures, which bring about the extrusions/intrusions with the size of a few micrometers in bulk metal. The characteristic feature of fatigue behavior at this scale is investigated using resonance vibration fatigue experiments on single crystal gold cantilevers of various sizes. Fatigue damage of extrusion/intrusion is formed on the cantilever surface in all specimens. The width of the extrusion/intrusion decreases with the size of cantilever, from hundreds to tens nanometers, which is much smaller than that in bulk components. And the slip traces formation is spatially periodic. The resolved shear stress to form an extrusion/intrusion is strongly dependent on the specimen size and is much higher than that in the bulk.