**5. Conclusions**

Laser peening without coating is a promising treatment for aluminum alloys. The outcomes of this work, focusing on LPwC applied at a notch, could be of interest for those applications in which the structural integrity is severely a ffected by the presence of holes and notches, such as aircraft components.

In summarizing, the following can be drawn from our observations:


What has been presented here suggests that laser peening without coating has the potential to improve the fatigue behavior of aluminium components, even when it is applied directly at a notch. In this regard, the LPwC technology could emerge as an alternative to conventional LSP.

**Author Contributions:** Conceptualization, E.T. and N.Z.; data curation, E.T. and N.Z.; formal analysis, E.T. and N.Z.; investigation, E.T. and N.Z.; methodology, E.T. and N.Z.; software, N.Z.; supervision, E.T.; validation, N.Z.; writing (original draft), E.T.; writing (review and editing), E.T. and N.Z.

**Funding:** This research received no external funding.

**Acknowledgments:** The authors are thankful to Paolo Proli for technical support, Goran Ivetic and Ivan Meneghin for the help in the tests.

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