Erwin, Erwin, Juan Pratama, Didik Sugiyanto, Yefri Chan, Trisna Ardi Wiradinata, M. Arik Febrian, and Dien Alma Ariz. 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.