Strengthening mechanism in Al–Cu–Li alloy processed by friction consolidation followed by high-pressure torsion

The primary objective of this study is to explore the precipitation behavior of Al–Cu–Li alloy powder
processed through a two-step approach: friction consolidation (FC) followed by high-pressure torsion (HPT).
Microstructure analysis by scanning electron microscope shows a refined microstructure after FC, with a
further reduction in grain size following HPT. X-ray diffraction analysis confirmed the formation of T1, T2,
and 𝛿 precipitates after FC, which persisted even after HPT. Small-angle X-ray scattering shows a reduction
in the volume fraction of larger precipitate particles after HPT, while the smaller grain volume fraction
increased. Additionally, the volume fraction of precipitates decreased as a function of strain. To understand
the contributions of various mechanisms to an enhanced hardness observed after HPT, a physical model
was employed. This study explores how HPT influences dislocation behavior, precipitation, and grain size,
highlighting its role in tailoring the microstructure and properties of the friction consolidated Al–Cu–Li alloy.

Subjects

Al–Cu–Li alloy

FC

HPT

Precipitation

SAXS

DDC Class

620.11: Engineering Materials

Lizenz

https://creativecommons.org/licenses/by/4.0/

Publication version

publishedVersion

Name

1-s2.0-S0925838825069385-main.pdf

Size

3.54 MB

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Adobe PDF

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Strengthening mechanism in Al–Cu–Li alloy processed by friction consolidation followed by high-pressure torsion