Material flow behavior and microstructural refinement of AA6061 alloy during friction extrusion

Kalsar, Rajib; Overman, Nicole; Darsell, Jens; Escobar, Julian; Li, Lei; Wang, Tianhao; Ma, Xiaolong; Soulami, Ayoub; Herling, Darrell; Joshi, Vineet V.

doi:10.1016/j.matchar.2024.113636

Material flow behavior and microstructural refinement of AA6061 alloy during friction extrusion

Journal Article · Mon Aug 21 04:00:00 EDT 2023 · Materials Characterization

DOI:https://doi.org/10.1016/j.matchar.2024.113636· OSTI ID:2377266

Kalsar, Rajib ^[1]; Overman, Nicole ^[1]; Darsell, Jens ^[1]; Escobar, Julian ^[1]; ^[1]; Wang, Tianhao ^[1]; Ma, Xiaolong ^[1]; ^[1]; Herling, Darrell ^[1]; ^[1]

Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

In this work we used friction extrusion (FE), a solid phase processing technique, to produce dense, fully consolidated 5?mm rods of aluminum alloy 6061 (AA6061). The combination of large shear stresses and high temperatures at the tool-billet interface during extrusion produced equiaxed, dynamically recrystallized grains and finely distributed precipitates. Texture and microstructure evolution during extrusion was investigated in detail using scanning electron microscopy, electron backscatter diffraction, and transmission electron microscopy. Smoothed particle hydrodynamics simulation was performed to study complex material flow during extrusion. Simulation results suggest spiral material flow during extrusion which corroborated experimental results. Advantages of friction extruded microstructure over conventionally extruded counterparts are also explored using flash annealing for solution treatment followed by artificial aging. Mechanical properties of the as-friction extruded, and the artificially aged specimens were evaluated using tensile testing and compared with conventional extruded material properties.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-76RL01830

OSTI ID:: 2377266

Alternate ID(s):: OSTI ID: 2369863

Report Number(s):: PNNL-SA-189195

Journal Information:: Materials Characterization, Journal Name: Materials Characterization Vol. 208; ISSN 1044-5803

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Material flow behavior and microstructural refinement of AA6061 alloy during friction extrusion

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