In-situ observation of bulk 3D grain evolution during plastic deformation in polycrystalline Cu

Abstract

We present a non-destructive in situ measurement of three-dimensional (3D) microstructure evolution of 99.995% pure polycrystalline copper during tensile loading using synchrotron radiation. Spatially resolved three-dimensional crystallographic orientation fields are reconstructed from the measured diffraction data obtained from a near-field high-energy X-ray diffraction microscopy (nf-HEDM), and the evolution of about 5000 3D bulk grains is tracked through multiple stages of deformation. Spatially resolved observation of macroscopic texture change, anisotropic deformation development, and the correspondence of different crystallographic parameters to defect accumulation are illustrated. Moreover, correlations between different crystallographic parameters, such as crystal rotation evolution, short-and long-range orientation gradient development, microstructural features, and grain size effects are investigated. The current state of data mining tools available to analyze large and complicated diffraction data is presented and challenges associated with extracting meaningful information from these datasets are discussed.

Shock induced damage in copper: A before and after, three-dimensional study

“…1(f)), sufficient volume from the less damaged region was reconstructed so as to allow for registration of the two datasets and examination of microstructural evolution. In regions with the most damage, based on comparison with prior quasi-static measurements on copper, 10 we estimate inhomogeneous local plastic strains on the order of 10%-20%.…”

“…[1][2][3] Recent advances in nondestructive characterization have allowed for some of the first direct comparisons between quasi-static models of plasticity in polycrystals [4][5][6][7] and experiment. [8][9][10] With the goal of linking to dynamic models, [11][12][13][14][15] we leverage these advances to study high strain-rate plasticity through shock loading of coarse-grained copper and discuss the first non-destructive characterization of dynamic damage nucleation in the bulk.…”

Coupled Crystal Plasticity–Phase Field Fracture Simulation Study on Damage Evolution Around a Void: Pore Shape Versus Crystallographic Orientation

“…Synchrotron measurements, in contrast, can determine polycrystaline microstructures at high spatial resolution in a non-destructive manner. 40 As an alternative available at laboratory scales, a diffraction contrast tomography enhancement for the current l-CT system (known as LabDCT 41 ) enables non-destructive characterization of individual grains, however at the cost of having only grain average orientation information.…”

Developing constitutive model parameters via a multi-scale approach

“…In a previous study [33], a well-annealed 99.9999 % pure copper specimen was prepared with a gauge section for a high-energy X-ray diffraction microscopy (HEDM) measurement under progressive tensile loading to evaluate the microstructural changes due to plastic deformation [34]. A roughly 300 × 300 × 100 voxelized domain of orientation information was measured and subsequently processed to provide phase and grain identifications for use in the VP-FFT simulation containing about 7000 grains.…”