Multimodal Analysis of Spatially Heterogeneous Microstructural Refinement and Softening Mechanisms in Three-Pass Friction Stir Processed Al4Si Alloy

Escobar Atehortua, Julian D.; Gwalani, Bharat; Olszta, Matthew J.; Silverstein, Joshua A.; Overman, Nicole R.; Bergmann, Luciano; Dos Santos, Jorge F.; Staron, Peter; Maawad, Emad; Klusemann, Benjamin; Mathaudhu, Suveen; Devaraj, Arun

doi:10.1016/j.jallcom.2021.161351

Multimodal Analysis of Spatially Heterogeneous Microstructural Refinement and Softening Mechanisms in Three-Pass Friction Stir Processed Al4Si Alloy

Journal Article · 20 December 2021 · Journal of Alloys and Compounds

DOI:https://doi.org/10.1016/j.jallcom.2021.161351· OSTI ID:1821456

Escobar Atehortua, Julian D. ^[1]; ^[1]; ^[1]; Silverstein, Joshua A. ^[1]; Overman, Nicole R. ^[1]; Bergmann, Luciano ^[2]; Dos Santos, Jorge F. ^[3]; Staron, Peter ^[2]; Maawad, Emad ^[2]; Klusemann, Benjamin ^[4]; Mathaudhu, Suveen ^[5]; ^[1]

BATTELLE (PACIFIC NW LAB)
Helmholtz-Zentrum Geesthacht
HELMHOLTZ-ZENTRUM GEESTHACHT
VISITORS
UNIVERSITY OF CALIFORNIA, RIVERSIDE

Multiple thermally and thermomechanically induced microstructural refinement mechanisms can be activated in metallic alloys when subjected to solid phase processing methods such as friction stir processing (FSP). In this work, we provide detailed descriptions of the relationship between region-specific microstructural refinement mechanisms and the variation in microhardness, through a systematic and multimodal microstructural characterization of an FSP-processed 75% cold-rolled Al-4 at.% Si model binary alloy. Spatially resolved high-energy synchrotron X-ray diffraction, electron backscattered diffraction, and scanning transmission electron microscopy were used to understand the spatially heterogeneous microstructural evolution due to FSP. Results provide insights into how mechanisms such as static recovery, static recrystallization, dynamic recovery and recrystallization, geometric and continuous dynamic recrystallization, and particle-stimulated static or dynamic grain nucleation may occur heterogeneously in the microstructure as a function of the distance from the stir zone in processed alloys, directly influencing the degree of softening. The systematic analysis of microstructures and hardness in the FSP-processed model binary alloy given in this work highlights the rich microstructural domains that can be uniquely harnessed through solid phase processing of metallic alloys.

Research Organization:: Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: AC05-76RL01830

OSTI ID:: 1821456

Report Number(s):: PNNL-SA-160439

Journal Information:: Journal of Alloys and Compounds, Vol. 887

Country of Publication:: United States

Language:: English

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