Ruestes, C. J. ; Bringa, E. M. ; Stukowski, A. ; Rodríguez Nieva, J. F. ; Tang, Y. ; Meyers, M. A. (2014)
Plastic deformation of a porous bcc metal containing nanometer sized voids.
In: Computational Materials Science, 88
doi: 10.1016/j.commatsci.2014.02.047
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
Nanoporous materials, can present an outstanding range of mechanical properties. Both molecular dynamics and dislocation analysis were used to evaluate and quantify the evolution of plasticity in a porous Ta single crystal containing randomly placed voids with 3.3 nm radii and average initial porosity of 4.1%, when subjected to uniaxial compressive strain. Nanovoids act as effective sources for dislocation emission. Dislocation shear loops nucleate at the surface of the voids and expand by the advance of the edge component. The evolution of dislocation configuration and densities were predicted by the molecular dynamics calculations and successfully compared to an analysis based on Ashby’s concept of geometrically-necessary dislocations. Resolved shear stress calculations were performed for all bcc slip systems and used to identify the operating Burgers vectors in the dislocation loops. The temperature excursion during plastic deformation was used to estimate the mobile dislocation density which is found to be less than 10% of the total dislocation density.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2014 |
| Autor(en): | Ruestes, C. J. ; Bringa, E. M. ; Stukowski, A. ; Rodríguez Nieva, J. F. ; Tang, Y. ; Meyers, M. A. |
| Art des Eintrags: | Bibliographie |
| Titel: | Plastic deformation of a porous bcc metal containing nanometer sized voids |
| Sprache: | Englisch |
| Publikationsjahr: | 1 Juni 2014 |
| Verlag: | Elsevier Science Publishing |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Computational Materials Science |
| Jahrgang/Volume einer Zeitschrift: | 88 |
| DOI: | 10.1016/j.commatsci.2014.02.047 |
| Kurzbeschreibung (Abstract): | Nanoporous materials, can present an outstanding range of mechanical properties. Both molecular dynamics and dislocation analysis were used to evaluate and quantify the evolution of plasticity in a porous Ta single crystal containing randomly placed voids with 3.3 nm radii and average initial porosity of 4.1%, when subjected to uniaxial compressive strain. Nanovoids act as effective sources for dislocation emission. Dislocation shear loops nucleate at the surface of the voids and expand by the advance of the edge component. The evolution of dislocation configuration and densities were predicted by the molecular dynamics calculations and successfully compared to an analysis based on Ashby’s concept of geometrically-necessary dislocations. Resolved shear stress calculations were performed for all bcc slip systems and used to identify the operating Burgers vectors in the dislocation loops. The temperature excursion during plastic deformation was used to estimate the mobile dislocation density which is found to be less than 10% of the total dislocation density. |
| Freie Schlagworte: | Molecular dynamics, Dislocations, Nanoporous, Nanovoid |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Materialmodellierung 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften |
| Hinterlegungsdatum: | 11 Sep 2014 07:41 |
| Letzte Änderung: | 11 Sep 2014 07:41 |
| PPN: | |
| Sponsoren: | C.J.R. thanks support from a PFDT scholarship and by UC Laboratories Research Program 12-LR-239079., E.M.B. thanks support from grant PICT2009-0092 and SeCTyP-UNCuyo., Y.T. and M.A.M. thank the UC Research Laboratories Grant 09-LR-118456. |
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