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On the Pile-Up and Sink-in Behavior of Indented Nickel Considering Dislocation Structures

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Abstract

Background: Surface topography of pile-up and sink-in is an issue of strain-hardening behavior around pyramidal and spherical indentations. The relationship between the surface profile and the activated dislocations is not clearly understood. Objective: This study combined electron channeling contrast imaging (ECCI), electron backscatter diffraction-based (EBSD) techniques and 3D laser microscopy to visualize the stress field and understand the influence of activated dislocations on the surface topography around an indent. Methods: The dislocation structures were identified using ECCI and geometrically necessary dislocation (GND) analysis. The stresses and GND densities were calculated to characterize the plastic deformation in terms of activated dislocations. The 3D laser microscopy was applied to reveal the surface topography. Results: The activated slip systems were identified as screw-type on \( \left(1\overline{1}\overline{1}\right)\left[110\right] \), \( \left(1\overline{1}\overline{1}\right)\left[101\right] \), \( \left(\overline{1}1\overline{1}\right)\left[011\right] \), \( (111)\left[\overline{1}10\right] \) and \( (111)\left[10\overline{1}\right] \) slip systems, and edge-type on \( \left(1\overline{1}\overline{1}\right)\left[101\right] \), \( \left(\overline{1}1\overline{1}\right)\left[\overline{1}01\right] \) and \( \left(\overline{1}\overline{1}1\right)\left[\overline{1}0\overline{1}\right] \) slip systems by combining ECCI and GND techniques. Furthermore, the surface morphology reveals a combination of pile-up and sink-in patterns around the indent, as observed by 3D laser microscopy. According to GND analysis, pile-up is generated from the \( \left(1\overline{1}\overline{1}\right)\left[\overline{1}\overline{1}0\right] \), \( (111)\left[1\overline{1}0\right] \), \( \left(1\overline{1}\overline{1}\right)\left[101\right] \) and \( \left(\overline{1}\overline{1}1\right)\left[101\right] \) slip systems, and sink-in is caused by the \( \left(\overline{1}1\overline{1}\right)\left[0\overline{1}\overline{1}\right] \), \( \left(1\overline{1}\overline{1}\right)\left[\overline{1}0\overline{1}\right] \), and \( \left(\overline{1}1\overline{1}\right)\left[10\overline{1}\right] \). Conclusions: The surface profile reveals a combination of pile-up and sink-in patterns resulting in the activated dislocations, where the deformation around the indent is dominated by screw-type dislocations.

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Acknowledgments

The authors would gratefully like to thank the Ministry of Science and Technology for funding the project under MOST 106-2221-E-006-071, MOST 107-2221-E-006-018 and MOST 108-2221-E-006-135, and Professor Tzu-Yao Tai at Southern Taiwan University of Science and Technology for providing 3D laser scanning microscopy to characterize the surface topography.

Funding

This study was funded by the Ministry of Science and Technology under grant number MOST 106–2221-E-006-071, 107–2221-E-006-018 and 108–2221-E-006-135.

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  1. Department of Materials Science and Engineering, National Cheng-Kung University, No.1, University Road, Tainan, 701, Taiwan, Republic Of China

    F.Y. Huang & J.C. Kuo

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  1. F.Y. Huang
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  2. J.C. Kuo
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Correspondence to J.C. Kuo.

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Huang, F., Kuo, J. On the Pile-Up and Sink-in Behavior of Indented Nickel Considering Dislocation Structures. Exp Mech 60, 1055–1066 (2020). https://doi.org/10.1007/s11340-020-00624-2

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