Extrusion of Unhomogenized Castings of 7075 Aluminum via ShAPE

Wang, Tianhao; Escobar Atehortua, Julian D.; Song, Miao; Reza-E-Rabby, Md; Taysom, Brandon S.; Silverstein, Joshua A.; Roosendaal, Timothy J.; Herling, Darrell R.; Whalen, Scott A.

doi:10.1016/j.matdes.2021.110374

Title: Extrusion of Unhomogenized Castings of 7075 Aluminum via ShAPE

Journal Article · 29 December 2021 · Materials & Design

DOI: https://doi.org/10.1016/j.matdes.2021.110374 · OSTI ID:1841742

^[1]; Escobar Atehortua, Julian D. ^[1]; Song, Miao ^[1];

^[1];

^[1]; Roosendaal, Timothy J. ^[1]; Herling, Darrell R. ^[1]; Whalen, Scott A. ^[1]

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

Extrusion of unhomogenized castings of 7075 aluminum (Al) alloy has been accomplished using shear assisted processing and extrusion (ShAPE). The simultaneous plastic deformation and heat generation during ShAPE rapidly fracture and dissolve interdendritic and intragranular secondary phases of Al-Zn-Mg-Cu, accomplishing homogenization in seconds rather than many hours in a furnace prior to extrusion. ShAPE thereby eliminates the energy-intensive and time-consuming homogenization step required to prepare as-cast microstructures for conventional extrusion. Concurrently, extensive grain refinement occurs due to gradient activation of dynamic recrystallization during ShAPE, which facilitates a threefold increase in extrusion speed compared to the conventional extrusion method. Evident enhancement of the mechanical properties of ShAPE+T6 samples is achieved, compared to the ASTM standard values for conventional extrusion products. The microstructural evolution pathway, involving the processes of grain refinement and secondary particle dissolution, is explained using scanning and transmission electron microscopy.

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

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Advanced Manufacturing Office

Grant/Contract Number:: AC05-76RL01830

OSTI ID:: 1841742

Report Number(s):: PNNL-SA-167731

Journal Information:: Materials & Design, Journal Name: Materials & Design Vol. 213; ISSN 0264-1275

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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