Kearney C, Zhao Z, Bruet B J F, Radovitzky R, Boyce M C, Ortiz C
Department of Mechanical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA.
Phys Rev Lett. 2006 Jun 30;96(25):255505. doi: 10.1103/PhysRevLett.96.255505.
The nanoscale anisotropic elastic-plastic behavior of single-crystal aragonite is studied using nanoindentation and tapping mode atomic force microscopy imaging. Force-depth curves coaxial to the axis exhibited load plateaus indicative of dislocation nucleation events. Plasticity on distinct slip systems was evident in residual topographic impressions where four pileup lobes were present after indentation with a conospherical probe and distinct, protruding slip bands were present after indentation with a Berkovich pyramidal probe. A finite element crystal plasticity model revealed the governing roles of the {110}<001>slip system family, as well as the (100)[010], (100)[001], (010)[100], (010)[001], (001)[100] and (001)[010] systems.
利用纳米压痕和轻敲模式原子力显微镜成像技术研究了单晶文石的纳米级各向异性弹塑性行为。与轴同轴的力-深度曲线显示出指示位错成核事件的载荷平台。在用球冠形探针压痕后出现四个堆积瓣的残余地形印记中，以及在用贝氏金字塔形探针压痕后出现明显的突出滑移带的情况下，不同滑移系上的塑性是明显的。有限元晶体塑性模型揭示了{110}<001>滑移系族以及(100)[010]、(100)[001]、(010)[100]、(010)[001]、(001)[100]和(001)[010]系的主导作用。
