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Meeting Materials Science & Technology 2020
Symposium Integration between Modeling and Experiments for Crystalline Metals: From Atomistic to Macroscopic Scales II
Presentation Title Ultra-high strength and plasticity mediated by partial dislocations and defect networks
Author(s) Ruizhe Su, Dajla Neffati, Yifan Zhang, Yashashree Kulkarni, Xinghang Zhang, Zhongxia Shang
On-Site Speaker (Planned) Xinghang Zhang
Abstract Scope Deformation mechanisms governing the strength of nanostructured metallic multilayers have been studied extensively for various applications. In general, size effect is the most effective way to tailor the mechanical strength of multilayers. Here we report that three Cu/Co multilayer systems with identical layer thickness but different types of layer interfaces exhibit drastically different mechanical behavior. In situ micropillar compression tests inside a scanning electron microscope show that coherent FCC (100) and (110) Cu/Co multilayer systems have low yield strength of about 600 MPa, and prominent shear instability. In contrast, the incoherent Cu/ HCP Co multilayers show much greater yield strength, exceeding 2.4 GPa, and significant plasticity manifested by a cap on the deformed pillar. Molecular dynamics simulations reveal an unexpected interplay between pre-existing twin boundaries in Cu, stacking faults in HCP Co, and incoherent layer interfaces, which leads to partial dislocation dominated high strength, and outstanding plasticity.


Applications of Computational Polarized Light Microscopy for Large Area Orientation Determination of alpha-Titanium
Bridging Computational Modeling and In Situ Experiment to Decipher Microscopic Deformation Mechanics
Characterization of 3-D Slip Fields in Deforming Polycrystals
Combining Multi-scale Modeling and Three-Dimensional Diffraction to Investigate Chemical and Displacement Ordering in Metallic Alloys
Design of an Austenitic Steel Weldment System Using ICME
Development of a Reactive Forcefield to Model Cu-Ni Alloy Oxidation and Surface Segregation in Thermal Conditions
Diffraction Elastic Constants from Electron Backscatter Diffraction Data and Finite Element Models
Directionally-anisotropic Mobility of Faceted Boundaries Explained through Interfacial Dislocation Mechanisms
ECCI Image Simulations for Arbitrary Defect Displacement Fields
Electron Backscatter Diffraction Pattern Simulation for Interaction Volume Containing Lattice Defects
Experimental Capabilities at High Pressure Collaborative Access Team (HPCAT) for In-situ and In-operando Characterization of Pressure/Stress Induced Microstructural Changes in Materials
Integrating Materials Models and Dynamical Electron Diffraction Simulations for Dislocation Analysis using STEM-Defect Contrast Imaging
Investigating the Microstructural Origins of Hydrogen Effects on Deformation and Fracture
Novel Remapping Method for HR-EBSD Based on Computer Vision Algorithm
On the Characterization of Twin-twin Interactions in Mg and Its Alloys
Predicting the Stress Strain Behavior of Nickel Single Crystal Through an Integrated First-principles Calculation and Crystal Plasticity Finite Element Modeling Approach
Regulating Elastic and Plastic Deformations by Microstructure Design and Coupling between Deformation and Phase Transformation - An Integrated Modeling and Experimental Study
Strong strain hardening in ultrafast melt-quenched nanocrystalline Cu: the role of fivefold twins
Synchrotron X-ray Tools for Multiscale Studies of Microstructure Evolution
Texture Evolution of Individual Layers during Accumulative Roll Bonding of Fe-Cu Metallic Laminates
Twinning Nucleation in Hexagonal Close-packed Crystals
Ultra-high strength and plasticity mediated by partial dislocations and defect networks

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