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
Hauptverfasser: Salehinia, I., Bahr, D.F.
Format: Artikel
Sprache:eng
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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.
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2011.11.028