A High-Speed Rotational Diamond Anvil Cell for In Situ Analysis of Hierarchical Microstructural Evolution of Metallic Alloys during Extreme Shear Deformation

Journal Article · Sat Jul 22 00:00:00 EDT 2023 · Microscopy and Microanalysis

DOI:https://doi.org/10.1093/micmic/ozad067.1025· OSTI ID:2222694

Devaraj, Arun ^[1]; Liu, Tingkun ^[1]; Park, Changyong ^[2]; Sinogeikin, Stanislav ^[3]

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1. Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
2. Argonne National Laboratory (ANL), Argonne, IL (United States)
3. DAC Tools, Naperville, IL (United States)

High speed shear deformation is ubiquitous in engineering applications, ranging from material processing methods such as friction stir processing/extrusion and in tribological contacts. However, analyzing the microstructural evolution of materials while they are undergoing high speed shear deformation have been a long-standing challenge. This led to predominant reliance on ex situ microscopy before and after shear deformation. But ex situ microscopy lacks the ability to analyze dynamic and transient hierarchical microstructural evolution mechanisms that could occur during shear deformation of materials. Therefore, to better understand the dynamic mechanisms of mass and energy transfer in materials under shear deformation, we developed a first of its kind high-speed rotational diamond anvil cell (HS-RDAC) for synchrotron-based in situ high-energy x-ray diffraction (XRD). We studied the time resolved lattice strain evolution, XRD peak broadening and changes in spatial variation of shear deformation induced alloying in pure metal and metal alloy sheets and powder mixture using the HS-RDAC. These in situ results were combined with detailed ex situ microstructural characterization before and after the shear deformation using transmission electron microscopy and atom probe tomography, which revealed the different stages of evolution of a shear deformation induced hierarchical nanostructure. Multiscale computational simulations including computational fluid dynamics, crystal plasticity, molecular dynamic simulation and density functional theory uncovered the mechanisms behind morphological changes, evolution of defect structures and changes in driving force for shear deformation induced intermixing. In conclusion, this in situ HS-RDAC capability, in combination with ex situ microstructural characterization and computational simulations, can provide new insights into the hierarchical microstructural evolution pathway during shear deformation.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
• Sponsoring Organization: USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC), Biological and Environmental Research (BER); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); USDOE National Nuclear Security Administration (NNSA)
• Grant/Contract Number: AC05-76RL01830; AC02-06CH11357
• OSTI ID: 2222694
• Report Number(s): PNNL-SA-185857
• Journal Information: Microscopy and Microanalysis, Vol. 29, Issue Supplement_1; ISSN 1431-9276
• Publisher: Microscopy Society of America (MSA)
• Country of Publication: United States
• Language: English

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36 MATERIALS SCIENCE