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Exploring the deformation behavior of nanotwinned Al–Zr alloy via in situ compression

Journal Article · · Journal of Applied Physics
DOI:https://doi.org/10.1063/5.0098497· OSTI ID:1880403

Nanotwinned metals have demonstrated the capacity for concomitant high strength and ductility. However, metals with high stacking fault energies, such as aluminum (Al), have a low propensity for twin formation. Here, we show the fabrication of supersaturated solid-solution Al–Zr alloys with a high density of growth twins. Incoherent twin boundaries (ITBs) are strong barriers to dislocation motion, while mobile partial dislocations promote plasticity. These deformable nanotwinned Al–Zr alloys reach a flow stress of ∼1 GPa, as demonstrated using in situ micropillar compression tests. Density functional theory calculations uncover the role Zr solute plays in the formation and deformation of the nanotwinned microstructure. This study features a strategy for incorporating ITBs and 9R phase into Al alloys for simultaneous benefits to strength and deformability.

Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0016337
OSTI ID:
1880403
Journal Information:
Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 6 Vol. 132; ISSN 0021-8979
Publisher:
American Institute of PhysicsCopyright Statement
Country of Publication:
United States
Language:
English

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