Erwin, E., Pratama, J., Sugiyanto, D., Chan, Y., Wiradinata, T. A., Febrian, M. A., & Ariz, D. A. (2026). Identifying the hardness level of recycled aluminum with the addition of cu powder through a melting mechanism below the melting point and precipitation reinforcement. Eastern-European Journal of Enterprise Technologies, 3(12 (141), 18–27. https://doi.org/10.15587/1729-4061.2026.359420