The impact of a variety of point defects on the inception of plastic deformation in dislocation-free metals
Atomistic simulations of nanoindentation tests were used to quantify the effect of point defects (a single vacancy, a di-vacancy, a self interstitial atom and a stacking fault tetrahedron) on the onset of plasticity in copper. The stacking fault tetrahedron reduces the pressure needed to nucleate a...
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Veröffentlicht in: | Scripta materialia 2012-03, Vol.66 (6), p.339-342 |
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Hauptverfasser: | , |
Format: | Artikel |
Sprache: | eng |
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Online-Zugang: | Volltext |
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Zusammenfassung: | Atomistic simulations of nanoindentation tests were used to quantify the effect of point defects (a single vacancy, a di-vacancy, a self interstitial atom and a stacking fault tetrahedron) on the onset of plasticity in copper. The stacking fault tetrahedron reduces the pressure needed to nucleate a dislocation by almost half of that of the perfect crystal. Reduction in the normalized yield pressure relative to the perfect crystal for a given defect is independent of indenter size. |
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ISSN: | 1359-6462 1872-8456 |
DOI: | 10.1016/j.scriptamat.2011.11.028 |