ProgramMaster Logo
Conference Tools for Materials Science & Technology 2020
Login
Register as a New User
Help
Submit An Abstract
Propose A Symposium
Presenter/Author Tools
Organizer/Editor Tools
About this Abstract
Meeting Materials Science & Technology 2020
Symposium Integration between Modeling and Experiments for Crystalline Metals: From Atomistic to Macroscopic Scales II
Presentation Title Strong strain hardening in ultrafast melt-quenched nanocrystalline Cu: the role of fivefold twins
Author(s) Amir Hassan Zahiri, Pranay Chakraborty, Yan Wang, Lei Cao
On-Site Speaker (Planned) Amir Hassan Zahiri
Abstract Scope Low ductility due to the absence of strain hardening effect in the nanocrystalline and nanotwinned metals is one of the recent challenges. In this work, we studied melt-quenched nanocrystalline Cu under compression, which contains high-density of fivefold twins (ffts), twin boundaries, and stacking faults and we observed sustained strain hardening effect. The molecular dynamics simulations show that the observed strain hardening is due to the contribution of numerous dislocation reactions, constant nucleation, dislocations impedance, and restricted twin boundary migration in fft networks. We find that dislocations can nucleate and impede by the ffts and migration of the fft boundary is restricted by its own core. Moreover, due to the gliding of two different Shockley partial dislocations in the opposite directions fft boundary migrates by two atomic planes directly. Finally, dislocation transmission observed among the fft boundaries. This work presents the advantage of ffts over nanotwins to overcome the strength-ductility trade-off.
Proceedings Inclusion? Planned: At-meeting proceedings

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

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

Questions about ProgramMaster? Contact programming@programmaster.org