## 4 Conclusions
\begin{table}
\begin{tabular}{c c c c c c} \hline \hline
**Response** & **DOE** & **RSM** & **GA** & **DOE-GA** \\ \hline \multirow{3}{*}{RD\%} & Value & 92.872 & 92.791 & 92.872 & 92.872 \\  & Cond. & P = 900 MPa, & P = 893.89 MPa, & P = 900 MPa, & P = 900 MPa, \\  & \(\mathrm{H/D}\) = 0.75, Al\({}_{2}\)O\({}_{3}\) = 0\% & H/D = 0.854, & H/D = 0.75, Al\({}_{2}\)O\({}_{3}\) = 0.031\% & H/D = 0.75, Al\({}_{2}\)O\({}_{3}\) = 0\% & H/D = 0.75, Al\({}_{2}\)O\({}_{3}\) = 0\% \\ \hline \multirow{3}{*}{H\({}_{\mathrm{v}}\)} & Value & 126.27 & 121.199 & 126.15 & 126.15 \\  & Cond. & P = 900 MPa, H/D= 0.75, & P = 875.087 MPa, & P = 900 MPa, & P = 900 MPa, \\  & \(\mathrm{Al_{2}O_{3}}\) = 10\% & H/D = 0.870, & H/D = 0.75, & H/D = 0.75, \\  & & Al\({}_{2}\)O\({}_{3}\) = 9.845\% & Al\({}_{2}\)O\({}_{3}\) = 10\% & Al\({}_{2}\)O\({}_{3}\) = 10\% & Al\({}_{2}\)O\({}_{3}\) = 10\% \\ \hline \multirow{3}{*}{\(\sigma_{\mathrm{y}}\) (MPa)} & Value & 312 & 341.372 & 350.399 & 350.398 \\  & Cond. & P = 700 MPa, & P = 884.243 MPa, & P = 900 MPa, & P = 900 MPa, \\  & \(\mathrm{H/D}\) = 1.25, & H/D = 0.762, & H/D = 0.75, & H/D = 0.75, \\  & \(\mathrm{Al_{2}O_{3}}\) = 10\% & Al\({}_{2}\)O\({}_{3}\) = 8.57\% & Al\({}_{2}\)O\({}_{3}\) = 10\% & Al\({}_{2}\)O\({}_{3}\) = 10\% \\ \hline \multirow{3}{*}{\(\sigma_{\mathrm{uc}}\) (MPa)} & Value & 384 & 410.93 & 421.906 & 421.906 \\  & Cond. & P = 700 MPa, & P = 506.142 MPa, & P = 500 MPa, & P = 500 MPa, \\  & Cond. & H/D = 1.25, & H/D = 0.873, & H/D = 0.75, & H/D = 0.75, \\  & \(\mathrm{Al_{2}O_{3}}\) = 10\% & Al\({}_{2}\)O\({}_{3}\) = 9.71\% & Al\({}_{2}\)O\({}_{3}\) = 10\% & Al\({}_{2}\)O\({}_{3}\) = 10\% \\ \hline \multirow{3}{*}{\(\varepsilon_{\mathrm{f}}\)} & Value & 13 & 13.54 & 13.0851 & 13.464 \\  & Cond. & P = 700 MPa, & P = 501.692 MPa, & P = 501.12 MPa, & P = 510 MPa, \\ \cline{1-1}  & \(\mathrm{H/D}\) = 1.25, Al\({}_{2}\)O\({}_{3}\) = 0\% & H/D = 0.757, & H/D = 0.758, & \\ \cline{1-1}  & & Al\({}_{2}\)O\({}_{3}\) = 0.017\% & Al\({}_{2}\)O\({}_{3}\) = 0\% & H/D = 0.75, Al\({}_{2}\)O\({}_{3}\) = 0\% \\ \hline \hline \end{tabular}
\end{table} 
Table 9: Summary results of RD, HV, and compressive properties of AL-4 Cu/xAl\({}_{2}\)O\({}_{3}\) composites. **Author Contributions:** Conceptualization, A.I.A. and W.H.E.-G.; methodology, H.K., S.E.-S. and S.E. ; software, H.K. and M.F.A. ; validation, H.K., S.E.-S. and M.K. ; formal analysis, S.E., H.K., S.E.-S. and M.K. ; investigation, M.O.A. and A.B. ; resources, S.E., A.N. and W.H.E.-G.; data curation, A.N. ; writing--original draft preparation, S.E., S.E.-S. and M.F.A. ; writing--review and editing, S.E., S.E.-S., M.K. and W.H.E.-G.; visualization, M.O.A. and A.B. ; supervision, A.I.A., A.N. and W.H.E.-G.; project administration, A.I.A., W.H.E.-G. and M.O.A. All authors have read and agreed to the published version of the manuscript. This research received no external funding. **Institutional Review Board Statement:** Not applicable. **Informed Consent Statement:** Not applicable. **Data Availability Statement:** All of the raw data supporting the conclusion of this paper were provided by the authors. **Acknowledgments:** The researchers would like to thank the Deanship of Scientific Research, Qassim University, for funding the publication of this project. **Conflicts of Interest:** The authors declare no conflict of interest. * [PERSON] (2005) [PERSON] Metal matrix composites--From science to technological significance. _Compos. Sci. Technol._**2005**, _65_, 2526-2540. [CrossRef]
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