Achieving highly strengthened Al–Cu–Mg alloy by grain refinement and grain boundary segregation

An age-hardenable Al–Cu–Mg alloy (A2024) was processed by high-pressure torsion (HPT) for producing an ultrafine-grained structure. The alloy was further aged for extra strengthening. The tensile strength then reached a value as high as ~1 GPa. The microstructures were analyzed by transmission elect...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2020-08, Vol.793, p.139668, Article 139668
Main Authors: Masuda, Takahiro, Sauvage, Xavier, Hirosawa, Shoichi, Horita, Zenji
Format: Article
Language:English
Subjects:
Age hardening
Aluminum alloys
Aluminum base alloys
Condensed Matter
Copper
Dispersion hardening
Grain boundaries
Grain Boundary Segregation
Grain refinement
Grain sub boundaries
Hardenability
High strength
Materials Science
Physics
Severe plastic deformation
Solid solutions
Solution strengthening
Tensile strength
Ultrafines
Work hardening
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Summary:An age-hardenable Al–Cu–Mg alloy (A2024) was processed by high-pressure torsion (HPT) for producing an ultrafine-grained structure. The alloy was further aged for extra strengthening. The tensile strength then reached a value as high as ~1 GPa. The microstructures were analyzed by transmission electron microscopy and atom probe tomography. The mechanism for the high strength was clarified in terms of solid-solution hardening, cluster hardening, work hardening, dispersion hardening and grain boundary hardening. It is shown that the segregation of solute atoms at grain boundaries including subgrain boundaries plays a significant role for the enhancement of the tensile strength.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2020.139668