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arXiv · 2007.08175

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

Takahiro Masuda·Xavier Sauvage·Shoichi Hirosawa·Zenji Horita
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Abstract

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.

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Takahiro Masuda, Xavier Sauvage, Shoichi Hirosawa, Zenji Horita. 2020-07-16. Achieving highly strengthened Al-Cu-Mg alloy by grain refinement and grain boundary segregation. https://doi.org/10.1016/j.msea.2020.139668

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