By a News Reporter-Staff News Editor at Science Letter -- Data detailed on Nanotechnology have been presented. According to news originating from West Lafayette, Indiana, by NewsRx correspondents, research stated, "Nanoscale metallic multilayers (NMM) have very high strength approaching a fraction of the theoretical limit. Their increased strength is attributed to the high interface density and is limited by the interfacial strength."
Our news journalists obtained a quote from the research from Purdue University, "As the density of interfaces increases (due to smaller layer thicknesses) the strength of NMM structures becomes increasingly determined by the specific nature and properties of the interfaces and is most likely controlled by the nucleation of dislocations from the interfaces. With focus on material systems with incoherent interfaces, we performed MD simulations to determine the controlling deformation mechanisms at different length scales for Cu-Nb multilayers under biaxial tensile deformation conditions. The results of the simulations show that there is a transition in the operative deformation mechanism in NMMs from Hall-Petch strengthening for the length scales of sub microns to microns, to individual dislocations confined to glide in individual layers for few nm to few tens of nm, and dislocation-nucleation-controlled models for less than few nanometers."
According to the news editors, the research concluded: "Based on these results, we develop a Molecular dynamics-based rate-sensitive model for viscoplastic flow which describes the anisotropic deformation behavior of NMMs at different length scales."
For more information on this research see: Multiscale modeling and simulation of deformation in nanoscale metallic multilayer systems. International Journal of Plasticity, 2014;52():33-50. International Journal of Plasticity can be contacted at: Pergamon-Elsevier Science Ltd, The Boulevard, Langford Lane, Kidlington, Oxford OX5 1GB, England. (Elsevier - www.elsevier.com; International Journal of Plasticity - www.elsevier.com/wps/product/cws_home/762)
The news correspondents report that additional information may be obtained from N. Abdolrahim, Purdue University, Sch Mat Engn, West Lafayette, IN 47907, United States. Additional authors for this research include H.M. Zbib and D.F. Bahr (see also Nanotechnology).
Keywords for this news article include: Indiana, Nanoscale, United States, West Lafayette, Nanotechnology, Emerging Technologies, North and Central America
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