Effect of subsurface voids on the nanoindentation of Fe crystals
| Autor: | Eduardo M. Bringa, J.A. Hofer, Carlos J. Ruestes, Herbert M. Urbassek |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Materials science 02 engineering and technology INGENIERÍAS Y TECNOLOGÍAS Nanoindentation NANOINDENTATION 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Computer Science Applications purl.org/becyt/ford/2 [https] Mechanics of Materials Modeling and Simulation Ingeniería de los Materiales 0103 physical sciences General Materials Science MOLECULAR DYNAMICS VOIDS Composite material 0210 nano-technology DISLOCATIONS purl.org/becyt/ford/2.5 [https] |
| Zdroj: | CONICET Digital (CONICET) Consejo Nacional de Investigaciones Científicas y Técnicas instacron:CONICET |
| DOI: | 10.1088/1361-651X/ab6915/meta |
| Popis: | Subsurface voids may strongly affect the response of materials to nanoindentation. We explore these effects for a bcc single-crystalline Fe sample using molecular dynamics simulation. Deformation occurs mainly by nucleation and propagation of dislocations. As dislocations impinge into the voids, these suffer a reduction in volume, consistent with mass transfer mechanisms. Our results show that voids act as highly efficient absorbers of dislocations, effectively limiting the extension of the plastic zone. Surprisingly, mechanical properties are marginally affected by the presence of voids in the range of sizes and spatial distributions tested, except for voids a few nanometers below the surface. Deformation twinning is observed as a transient effect in some cases; however, for voids close enough to the indentation area, no twinning was found. Fil: Hofer, Juan Andres. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Instituto Balseiro; Argentina Fil: Ruestes, Carlos Javier. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto Interdisciplinario de Ciencias Básicas. - Universidad Nacional de Cuyo. Instituto Interdisciplinario de Ciencias Básicas; Argentina. Universidad Nacional de Cuyo. Facultad de Ciencias Exactas y Naturales; Argentina Fil: Bringa, Eduardo Marcial. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina. Universidad de Mendoza. Facultad de Ingeniería; Argentina. Universidad Mayor; Chile Fil: Urbassek, Herbert M.. University Kaiserslautern; Alemania |
| Databáze: | OpenAIRE |
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