Lu Cheng, Gao Yuan, Michal Guillaume, Deng Guanyu, Huynh Nam N, Zhu Hongtao, Liu Xianghua, Tieu Anh Kiet
School of Mechanical, Materials and Mechatronic Engineering, University of Wollongong, Wollongong NSW 2500, Australia.
J Nanosci Nanotechnol. 2009 Dec;9(12):7307-13. doi: 10.1166/jnn.2009.1793.
Experiments and molecular dynamics (MD) simulations have been conducted to investigate the nanoindentation behaviours of iron with body centered cubic (BCC) structure. The experiments show that the indentation hardness decreases with the indentation depth and it changes sharply for a small depth. Two cases with different crystallographic orientations have been simulated. The indentation plane is (010) for Case I and (111) for Case II, respectively. The calculated harness (17.4 GPa for Case I and 22.6 GPa for Case II) are in reasonable agreement with the experimental value (24.2 GPa). The simulation results show that the crystallographic orientation significantly influences the indentation deformation. Case I and Case II exhibit different deformation patterns. The indentation force and the hardness in Case I are smaller than Case II. It is also found that the pileup around the indenter is mainly formed along [110] direction for both cases.
已经进行了实验和分子动力学（MD）模拟，以研究具有体心立方（BCC）结构的铁的纳米压痕行为。实验表明，压痕硬度随着压痕深度的增加而降低，并且在较小深度时变化剧烈。模拟了两种具有不同晶体取向的情况。情况I的压痕平面为（010），情况II的压痕平面为（111）。计算得到的硬度（情况I为17.4 GPa，情况II为22.6 GPa）与实验值（24.2 GPa）合理吻合。模拟结果表明，晶体取向对压痕变形有显著影响。情况I和情况II表现出不同的变形模式。情况I的压痕力和硬度小于情况II。还发现，两种情况下压头周围的堆积主要沿[110]方向形成。
