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Engineering Conferences International
Nanomechanical Testing in Materials Research and Development V
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Size Effects And Deformation Mechanisms In Diamond And Silicon, Jeffrey Wheeler, R. Raghavan, J. Rabier, J. Wehrs, J. Michler
Size Effects And Deformation Mechanisms In Diamond And Silicon, Jeffrey Wheeler, R. Raghavan, J. Rabier, J. Wehrs, J. Michler
Nanomechanical Testing in Materials Research and Development V
At ambient temperature and pressure, most of the semiconductor materials are brittle. Traditionally, use of confining pressure via indentation or a hydrostatic confining medium [1, 2] has been required to study the plasticity of such brittle materials. In the case of group IV semiconductors (Diamond, Silicon, and Germanium) the situation is further complicated by pressure-induced phase transformations occurring underneath the indentations. However, previous work has demonstrated that sample miniaturization can also prevent the onset of cracking and allow plastic deformation [3]. Recent advances in in situ instrumentation have enabled micro-compression techniques to extract temperature- and …
Size Dependent Deformation Of Beta Brass, Oscar Torrents, Bentejui Medina Clavijo, Carl Frick, Andreas Schneider, Eduard Arzt
Size Dependent Deformation Of Beta Brass, Oscar Torrents, Bentejui Medina Clavijo, Carl Frick, Andreas Schneider, Eduard Arzt
Nanomechanical Testing in Materials Research and Development V
Previous research has shown that size scale dictates materials strength, reaching into the GPa range for specimens in the (sub-) micron regime. However, the influence of crystal structure on this ‘size-effect’ is poorly understood. In the present work, the deformation behavior of beta brass, which has a CsCl (B2) crystal structure and a low thermal component to the room temperature strength, has been studied through the compression of focused ion beam manufactured pillars at room temperature. The size dependence of beta brass is found to be close to that observed in FCC metals although the deformation processes differ significantly. While …
Dislocation Dipoles And The Nucleation Of Cracks In Silicon Nanopillars, J. Rabier, F. Abed El Nabi, J. Godet, S. Brochard, L. Pizzagalli
Dislocation Dipoles And The Nucleation Of Cracks In Silicon Nanopillars, J. Rabier, F. Abed El Nabi, J. Godet, S. Brochard, L. Pizzagalli
Nanomechanical Testing in Materials Research and Development V
To understand the brittle to ductile transtion at small scale in silicon nanopillars, plastic deformation of silicon nanopillars was investigated by atomistic simulations. Perfect dislocations were found to be nucleated from surfaces and nano cavities were evidenced resulting from dislocation dipoles annihilation. The formation of such cavities is consistent with previous atomistic calculations showing that the annihilation of dislocation vacancy dipole of perfect shuffle dislocations is associated to the formation of vacancy clusters in silicon and diamond [1]. In nanopillars such cavities contribute to the nucleation of cracks [2]. This mechanism of crack nucleation is relevant to single slip deformation …