Prof.  Caizhi  Zhou
Missouri University of Science and Technology,  USA

Title: Understanding Deformation Mechanisms in Advanced Nanostructured Materials by Multiscale Modeling

Abstract:

Advanced metallic nanostructured materials, such as metallic nanolayered composites, nanotwinned metals and gradient nano-grained materials, have drawn increased attention in the past decade because of their ultrahigh strength, increased ductility and elevated fracture toughness. Fundamental barriers must be resolved to manufacture such advanced nanostructured materials in bulk form and at reduced cost. Significant research has been conducted in recent years to understand the underlying mechanisms that control the mechanical behavior of these advanced nanostructured materials. Both experiments and modeling have revealed that as microstructure length-scales are reduced from micrometer- to nanometer levels, interfaces, such as grain boundaries and phase boundaries, become crucial in determining the mechanical behavior of nanostructured materials. Through the development of computer resources and novel experimental methods, macroscopic and phenomenological descriptions of mechanical behaviors are being substituted by multiscale approaches rooted in deeper understanding of microstructure- and defect-level processes during the deformation. Challenges remain in developing models with truly predictive capability in applications to nanostructured materials.This talk will review various modeling tools at different length scales and present a new hierarchical multiscale modeling framework to study mechanical behavior of nanostructured materials and provide a scientific basis for design and processing advanced materials with superior properties.

Biography: