The Effect of the Vertex Angles of Wedged Indenters on Deformation during Nanoindentation
| Autor: | Yushan Ni, Xiaowen Hu |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Materials science
nanoindentation dislocation nucleation and emission General Chemical Engineering Vertex angle Nucleation chemistry.chemical_element 02 engineering and technology multiscale simulation wedged indenter size effect of hardness during indentation 01 natural sciences Inorganic Chemistry Aluminium 0103 physical sciences lcsh:QD901-999 General Materials Science Composite material 010302 applied physics Drop (liquid) Nanoindentation 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure chemistry Partial dislocations lcsh:Crystallography 0210 nano-technology |
| Zdroj: | Crystals; Volume 7; Issue 12; Pages: 380 Crystals, Vol 7, Iss 12, p 380 (2017) |
| ISSN: | 2073-4352 |
| DOI: | 10.3390/cryst7120380 |
| Popis: | In order to study the effect of the angle of wedged indenters during nanoindentation, indenters with half vertex angles of 60°, 70° and 80° are used for the simulations of nanoindentation on FCC aluminum (Al) bulk material by the multiscale quasicontinuum method (QC). The load-displacement responses, the strain energy-displacement responses, and hardness of Al bulk material are obtained. Besides, atomic configurations for each loading situation are presented. We analyze the drop points in the load-displacement responses, which correspond to the changes of microstructure in the bulk material. From the atom images, the generation of partial dislocations as well as the nucleation and the emission of perfect dislocations have been observed with wedged indenters of half vertex angles of 60° and 70°, but not 80°. The stacking faults move beneath the indenter along the direction [ 1 1 ¯ 0 ] . The microstructures of residual displacements are also discussed. In addition, hardness of the Al bulk material is different in simulations with wedged indenters of half vertex angles of 60° and 70°, and critical hardness in the simulation with the 70° indenter is bigger than that with the 60° indenter. The size effect of hardness in plastic wedged nanoindentation is observed. There are fewer abrupt drops in the strain energy-displacement response than in the load-displacement response, and the abrupt drops in strain energy-displacement response reflect the nucleation of perfect dislocations or extended dislocations rather than partial dislocations. The wedged indenter with half vertex angle of 70° is recommended for investigating dislocations during nanoindentation. |
| Databáze: | OpenAIRE |
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