**4. Conclusions**

The mechanical properties and microstructure evolution of an Al-Cu-Li alloy processed by CR and HR were investigated. The conclusions can be drawn as follows:


**Author Contributions:** Conceptualization, H.Y. and A.P.; methodology, L.W.; investigation, L.W., C.K., P.T., D.P.; resources, H.Y.; writing—original draft preparation, H.Y.; writing—review and editing, all authors; supervision, H.Y.; project administration, H.Y. and A.P.; funding acquisition, H.Y., and A.P. All authors have read and agreed to the published version of the manuscript.

**Funding:** This research was funded by the National Key Research and Development Program (Grant No.: 2019YFB2006500), National Natural Science Foundation of China (Grant number: 5167040503), Innovation Driven Program of Central South University (Grant No.: 2019CX006), the Science and Technology Innovation Program of Hunan Province (Grant No.: 2020RC2002), the Research Fund of the Key Laboratory of High Performance Complex Manufacturing at Central South University. A.P.

and D.P. appreciate the financial support of the research which was carried out within the framework of the implementation of the Resolution of the Government of the Russian Federation of April 9, 2010, No. 220 (Contract No. 075-15-2019-869 from May 12, 2019) and a gran<sup>t</sup> from the Russian Science Foundation (project No. 20-69-46042 of 20.05.2020).

**Institutional Review Board Statement:** Not applicable.

**Informed Consent Statement:** Not applicable.

**Data Availability Statement:** The data presented in this study are available on request from the corresponding author.

**Conflicts of Interest:** The authors declare no conflict of interest.
