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Meeting 2018 TMS Annual Meeting & Exhibition
Symposium Thermo-mechanical Response of Materials with Special Emphasis on In-situ Techniques
Presentation Title Deformation Mechanisms of Cu/Nb Nanoscale Metallic Multilayers as a Function of Temperature and Layer Thickness
Author(s) Miguel Alberto Monclus, Jeromy Snel, Miguel Castillo-Rodriguez, Nathan A Mara, Irene J Beyerlein, Javier Llorca, Jon M Molina-Aldareguia
On-Site Speaker (Planned) Miguel Alberto Monclus
Abstract Scope The mechanical properties and deformation mechanisms of Cu/Nb nanoscale metallic multilayers (NMMs) manufactured by accumulative roll bonding (ARB) were studied at 25C, 200C and 400C. Cu/Nb NMMs with individual layer thicknesses between 7 and 63 nm were tested by in-situ micropillar compression inside a scanning electron microscope. Yield strength, strain-rate sensitivities and activation volumes were obtained from the pillar compression tests. The deformed micropillars were examined under scanning and transmission electron microscopy in order to study the active deformation mechanisms. Room temperature deformation was determined by dislocation glide at larger layer thicknesses and interface-related mechanisms at the thinner layer thicknesses. High temperature compression tests revealed superior thermo-mechanical stability for the NMMs with larger layer thicknesses with deformation controlled by dislocation glide, while a remarkable transition to a deformation response controlled by diffusion processes along the interfaces occurred as the layer thickness decreased, which resulted in temperature-induced softening.
Proceedings Inclusion? Planned: Supplemental Proceedings volume


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