6th International Congress on 3D Materials Science (3DMS 2022): 4D Data Analysis II: Thermo-Mechanical Processing
Program Organizers: Dorte Juul Jensen, Technical University of Denmark; Marie Charpagne, University of Illinois; Keith Knipling, Naval Research Laboratory; Klaus-Dieter Liss, University of Wollongong; Matthew Miller, Cornell University; David Rowenhorst, Naval Research Laboratory
Tuesday 9:30 AM
June 28, 2022
Room: Capitol B
Location: Hyatt Regency Washington on Capitol Hill
Session Chair: Jon Tischler, Argonne National Laboratory
9:30 AM Invited
Measurements of 3D Microstructures to Determine Grain Boundary Velocities in Polycrystal: Gregory Rohrer1; Zipeng Xu1; Aditi Bhattacharya1; Robert Suter1; 1Carnegie Mellon University
Using high-energy diffraction microscopy, we have measured the velocities of grain boundaries within Ni and Fe polycrystals. Thousands of grain boundaries were tracked and their velocities and curvatures were classified by their crystallographic characteristics. Among the findings, two are noteworthy and will be discussed in this talk. First, the velocities vary with all five crystallographic grain boundary parameters. Second, grain boundary velocity is independent of grain boundary mean curvature. Because curvature is an important component of the driving force, velocity and curvature are expected to be correlated positively. However, the evidence for such a correlation is poor. Three possible explanations for these observations will be presented: constrained migration of boundaries in connected networks, defect (disconnection) mediated grain boundary migration, and the influence of grain boundary stiffness on migration.
10:00 AM
Influence of Grain Boundary Energy Anisotropy on the Evolution of Grain Boundary Network Structure During 3D Anisotropic Grain Growth: Jose Nino1; Oliver Johnson1; 1Brigham Young University
The evolution of the structure of the Grain Boundary network (GBN) during grain growth strongly influences material properties. Historical modeling efforts considered isotropic interface properties. However, it has been shown that anisotropic boundary properties affect grain growth. More recent computational studies of grain growth have considered anisotropy in the context of simplified models for which GB energy depends only on lattice misorientation (e.g. using a Read-Shockley model). In this talk, we present results of fully anisotropic grain growth simulations (based on level set methods) in three dimensions. Fully 5D grain boundary energy anisotropy is considered, using a recently developed GB energy model that considers all five GB crystallographic degrees of freedom. We characterize the global structure of the GB network using a recent spectral decomposition technique. The present work shows how anisotropic interfaces energies influence the evolution of the spectrum of the GB network during grain growth.
10:20 AM Cancelled
The Materials Oscilloscope: Thermo-Mechanical Processing in a Synchrotron Beam: Klaus-Dieter Liss1; 1Guangdong Technion - Israel Institute of Technology (GTIIT)
High-energy synchrotron radiation is bulk penetrating to reveal the microstructural evolution of metals under various conditions. Fine-bundled high-energy X-rays deliver reflections from a number of individual grains. For each constituting phase, their statistics and behavior in time reveal information about grain growth or refinement, subgrain formation, static and dynamic recovery and recrystallization, slip systems, twinning, etc. by revealing at least two dimensions in reciprocal space, and time. A new synchrotron sources with X-ray energies 100-150 keV, together with a small source size and high flux allows for beam focusing to the 1 um scale in order to investigate grain evolution on sub-micrometer sizes. Furthermore, local investigations in heterogeneous and structured materials can be investigated.Combining these capabilities with an industry-lab scale physical thermo-mecanical simulator and automation of data analysis raises novel capabilities in metals development.
10:40 AM Break
11:00 AM
Development of the Cube Component ({001}<100>) during Plane Strain Compression of Copper and its Importance in Recrystallization Nucleation: Supriyo Chakraborty1; Chaitali Patil1; Stephen Niezgoda1; 1The Ohio State University
The origin of cube texture during recrystallization of medium to high stacking-fault energy FCC metals has been debated for several decades. However, evolution of the cube component during deformation is not studied well and hence, it is still unclear what are the favorable nucleation sites for the cube oriented grains. To resolve this issue, we applied a 3D full field crystal plasticity model utilizing a dislocation density based constitutive theory for the simulation of plane strain compression of polycrystalline copper. Simulation results reveal that some of the grains with initially non-cube orientations developed the cube component during the deformation. No particular axis preference was observed for these non-cube grains. Analysis of the disorientation angle and the dislocation density difference with the neighboring locations shows that the cube component developed during the deformation can play a significant role during nucleation.
11:20 AM
Recrystallization Boundary Migration in 3D: Chuanshi Hong1; Yubin Zhang2; Wenjun Liu3; Runguang Li2; Eric Homer4; Dorte Juul Jensen2; 1Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences,; 2Technical University of Denmark; 3APS, Argonne National Laboratory; 4Brigham Young University
It is well-known that the driving force for recrystallization is the energy and thus the dislocations stored in the deformed matrix. It is however not known how the migration of the recrystallization boundary is affected by the specific geometrical arrangement of the dislocations. Such phenomena can not be characterized in 2D, full 3D mapping is needed. This is the purpose of the present work. A pure aluminium single crystal is cold rolled to 12% and nucleation is stimulated by a hardness indentation in one of the two crystals. Synchrotron X-rays using the 34-ID-E beamline at APS are used to map the deformation structure in 3D and to follow the growth of a nucleus formed at the hardness indent during 4 annealing steps. The boundary migration through the deformation microstructure is described and geometric as well as crystallographic interaction effects are discussed