TY - JOUR

T1 - Heterogenous activation of dynamic recrystallization and twinning during friction stir processing of a Cu-4Nb alloy

AU - Escobar, Julian

AU - Gwalani, Bharat

AU - Olszta, Matthew

AU - Silverstein, Joshua

AU - Ajantiwalay, Tanvi

AU - Overman, Nicole

AU - Fu, Wenkai

AU - Li, Yulan

AU - Bergmann, Luciano

AU - Maawad, Emad

AU - Klusemann, Benjamin

AU - Santos, Jorge F. dos

AU - Devaraj, Arun

N1 - This work was supported by the Laboratory Directed Research and Development program at Pacific Northwest National Laboratory (PNNL) as part of the Solid Phase Processing Science initiative. A portion of this research was performed using facilities at the Environmental Molecular Sciences Laboratory, a national scientific user facility sponsored by the U.S. Department of Energy’s (DOE’s) Biological and Environmental Research program and located at PNNL. PNNL is a multiprogram national laboratory operated by Battelle for the DOE under Contract DEAC05-76RL01830 . J.D.E. would like to acknowledges S. Mathaudu and C. Powell for solid phase processing science initiative sponsored publication writing course. Parts of this research were carried out at the Hereon beamline P07 at PETRA III at DESY, a member of the Helmholtz Association. We would like to thank Norbert Schell for assistance in using beamline P07. Publisher Copyright: © 2022

PY - 2022/12/20

Y1 - 2022/12/20

N2 - An interplay between high degree of shear deformation and deformation-induced heating occurs during friction stir processing (FSP) of metals. In medium-to-low stacking fault energy Cu alloys, this can lead to a complex spatially heterogenous activation of dynamic recrystallization (DRX) and twinning mechanisms. Within the Cu-Nb system, the presence of Nb is further expected to influence the DRX mechanism of the Cu matrix. However, the microstructural changes induced by the co-deformation of Nb during FSP are still not well understood. Therefore, this study uses a combination of multimodal microstructural characterization, solution thermodynamics-based predictions, and computational crystal plasticity simulation to reveal the various microstructural evolution mechanisms that can occur during FSP of a Cu-4at.%Nb binary model alloy. The formation of softer DRX zones, and harder shear localization regions are revealed using electron backscatter diffraction, transmission electron microscopy, atom probe tomography, and crystal plasticity modeling.

AB - An interplay between high degree of shear deformation and deformation-induced heating occurs during friction stir processing (FSP) of metals. In medium-to-low stacking fault energy Cu alloys, this can lead to a complex spatially heterogenous activation of dynamic recrystallization (DRX) and twinning mechanisms. Within the Cu-Nb system, the presence of Nb is further expected to influence the DRX mechanism of the Cu matrix. However, the microstructural changes induced by the co-deformation of Nb during FSP are still not well understood. Therefore, this study uses a combination of multimodal microstructural characterization, solution thermodynamics-based predictions, and computational crystal plasticity simulation to reveal the various microstructural evolution mechanisms that can occur during FSP of a Cu-4at.%Nb binary model alloy. The formation of softer DRX zones, and harder shear localization regions are revealed using electron backscatter diffraction, transmission electron microscopy, atom probe tomography, and crystal plasticity modeling.

KW - Engineering

KW - dynamic recrystallization

KW - twinning

KW - friction stir processing

KW - copper-niobium

KW - Copper-niobium

KW - Twinning

KW - Dynamic recrystallization

KW - Friction stir processing

KW - Copper-niobium

KW - Dynamic recrystallization

KW - Friction stir processing

KW - Twinning

UR - http://www.scopus.com/inward/record.url?scp=85138115772&partnerID=8YFLogxK

UR - https://www.mendeley.com/catalogue/93a799d6-ab5b-3603-8992-ed1fecc773b9/

U2 - 10.1016/j.jallcom.2022.167007

DO - 10.1016/j.jallcom.2022.167007

M3 - Journal articles

VL - 928

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

SN - 0925-8388

M1 - 167007

ER -