Microstructure evolution, enhanced aging kinetics, and mechanical properties of AA7075 alloy after friction extrusion

Kalsar, Rajib; Ma, Xiaolong; Darsell, Jens T.; Zhang, Dalong; Kappagantula, Keerti S.; Herling, Darrell R.; Joshi, Vineet V.

doi:10.1016/j.msea.2021.142575

Microstructure evolution, enhanced aging kinetics, and mechanical properties of AA7075 alloy after friction extrusion

Journal Article · Tue Dec 28 00:00:00 EST 2021 · Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing

DOI:https://doi.org/10.1016/j.msea.2021.142575· OSTI ID:1909824

Kalsar, Rajib ^[1]; ^[1]; ^[1]; Zhang, Dalong ^[1]; ^[1]; Herling, Darrell R. ^[1]; ^[1]

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

In the present study we utilized Friction Extrusion (FE) a solid phase processing technique to produce fully consolidated dense 5 mm rods of AA7075 alloy. The combination of large shear stresses and temperatures at the tool-billet interface during the FE process resulted in the formation of dynamically recrystallized ~2.0 μm equiaxed grains and fine uniformly distributed stable η (MgZn₂) precipitates ~25–100 nm in size. Formation of such a microstructure resulted in lower solutionizing temperature and times (flash annealing) as compared to the conventionally extruded counterparts. Here we demonstrate for the first time that the solutionizing times for the T6 heat treatment of AA7075 can be reduced by three times using this FE process. In addition to being an energy efficient process, FE also serves to improve the performance of AA7075 alloys by retaining their strength while enhancing the ductility of the material. The tensile data for samples that were flash annealed and artificially aged after FE processing showed exceptional increase in ultimate tensile strength by over 19% and yield strength by over 59%, compared with an as-FE-processed sample.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Vehicle Technologies Office

Grant/Contract Number:: AC05-76RL01830

OSTI ID:: 1909824

Report Number(s):: PNNL-SA-166338

Journal Information:: Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing, Journal Name: Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing Vol. 833; ISSN 0921-5093

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
AA7075
Friction Extrusion™
aging
flash annealing
microstructure
tensile properties

Microstructure evolution, enhanced aging kinetics, and mechanical properties of AA7075 alloy after friction extrusion

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