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Superhard silicon nanospheres |
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| Authors: | WW Gerberich WM Mook CB Carter R Mukherjee J Heberlein SL Girshick |
| Institution: | a Chemical Engineering and Materials Science, 151 Amundson Hall, University of Minnesota, 421 Washington, Minneapolis, MN 55455, USA b Materials Science and Technology Division, MS G755, Los Alamos National Laboratory, Los Alamos, NM 87545, USA c Mechanical Engineering, 111 Church St., University of Minnesota, Minneapolis, MN 55455, USA |
| Abstract: | Successful deposition and mechanical probing of nearly spherical, defect-free silicon nanospheres has been accomplished. The results show silicon at this length scale to be up to four times harder than bulk silicon. Detailed measurements of plasticity evolution and the corresponding hardening response in normally brittle silicon is possible in these small volumes. Based upon a proposed length scale related to the size of nanospheres in the 20- radii range, a prediction of observed hardnesses in the range of 20- is made. The ramifications of this to computational materials science studies on identical volumes are discussed. |
| Keywords: | A Dislocations A Indentation and hardness A Strengthening and mechanisms |
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