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Shear stress-driven refreshing capability of plastic deformation in metallic nanolayered composites

Thursday (29.09.2016)
12:00 - 12:15
Part of:

Although metallic nanolayered composites are of very high strength/hardness (about 1/2-1/3 theoretical strength) when the individual layer thickness of the composites approaches nanometer scale, the plastic deformation ability of the materials is very limited due to the prevailed development of shear bands. In this talk, based on atomic-scale observations and analysis, we show that severely localized deformation (the continuous thinning of the layers) within the indentation-induced shear bands of the 25 nm Cu/25 nm Au nanolayered composite is essentially attributed to the shear stress component along the interface, which can refresh the capability of the interface to absorb incoming dislocations through unlocking the product of the dislocation-interface reaction. The dislocation-interface interaction influenced by the shear stress for plastic deformation within shear bands will be discussed to understand the interface-mediated plasticity of nanostructured composites.

Prof. Dr. Guang-Ping Zhang
Chinese Academy of Sciences
Additional Authors:
  • Dr. Jia-Wei Yan
    Institute of Metal Research, Chinese Academy of Sciences