期刊
MATERIALS
卷 14, 期 8, 页码 -出版社
MDPI
DOI: 10.3390/ma14081879
关键词
pop-in; nanoindentation; plasticity initiation; dislocation nucleation; lattice defects
类别
资金
- KAKENHI from the Japan Society for the Promotion of Science (JSPS) [JP16H06366, JP18H01696]
- Elements Strategy Initiative for Structural Materials (ESISM) through the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan [JPMXP0112101000]
The paper discusses the phenomenon of pop-in during indentation-induced deformation at a very small scale, emphasizing its importance as a fundamental deformation behavior in various materials and analyzing its mechanical and physical principles.
The attractive strain burst phenomenon, so-called pop-in, during indentation-induced deformation at a very small scale is discussed as a fundamental deformation behavior in various materials. The nanoindentation technique can probe a mechanical response to a very low applied load, and the behavior can be mechanically and physically analyzed. The pop-in phenomenon can be understood as incipient plasticity under an indentation load, and dislocation nucleation at a small volume is a major mechanism for the event. Experimental and computational studies of the pop-in phenomenon are reviewed in terms of pioneering discovery, experimental clarification, physical modeling in the thermally activated process, crystal plasticity, effects of pre-existing lattice defects including dislocations, in-solution alloying elements, and grain boundaries, as well as atomistic modeling in computational simulation. The related non-dislocation behaviors are also discussed in a shear transformation zone in bulk metallic glass materials and phase transformation in semiconductors and metals. A future perspective from both engineering and scientific views is finally provided for further interpretation of the mechanical behaviors of materials.
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