TY - JOUR T2 - Journal of Mining and Metallurgy, Section B: Metallurgy TI - Effect of Cold Rolling and Annealing Temperature to the Characteristics of α + β’ Phases in Cu-29.5Zn-2.5Al Alloy Produced by Gravity Casting VL - 56 IS - 1 SP - 89 EP - 97 PY - 2020 DO - 10.2298/JMMB180820037A AU - I. Angela AU - I. Basori AU - B.T. Sofyan AD - a Universitas Indonesia, Department of Metallurgy and Materials Engineering, Faculty of Engineering, Depok, Indonesia b Universitas Negeri Jakarta, Department of Mechanical Engineering, Faculty of Engineering, Jakarta, Indonesia AB - Al-brass alloys (Cu29.5Zn2.5Al wt. %) were produced by gravity casting and homogenized at 800 °C for 2 h, resulting in a binary phase morphology identified as cubic α and martensitic βʹ phases through X-ray diffraction (XRD). Samples were then subsequently cold rolled and annealed at 150, 300, 400, and 600 °C for 30 minutes. Visible traces of slip, intersecting slip bands, and shear bands were observed in microstructure images of the samples after each progressive deformation stage. Deformation-induced martensites were present after 20 % cold rolling. Higher thickness reduction resulted in simultaneous strain hardening of the phases. Low temperature annealing slightly increased microhardness, of both α and βʹ, due to the formation of precipitates. SEM-EDX analysis showed that no solute segregation was found in annealed samples. Annealing at higher temperature resulted in conventional softening. Recrystallized equiaxed βʹ phase grains were visible after annealing at 600 °C. KW - Aluminium KW - Brass KW - Homogenization KW - Martensitic KW - Cold rolling KW - Annealing N1 - Correspondence Address: B.T. Sofyan,a Universitas Indonesia, Department of Metallurgy and Materials Engineering, Faculty of Engineering, Depok, Indonesia email: bondan@eng.ui.ac.id N1 - J. Min. Metall. Sect. B-Metall. 56 (1) B (2020) 89-97. DOI:10.2298/JMMB180820037A PB - Technical Faculty in Bor SN - 14505339 (ISSN) LA - English J2 - J. Min. Metall. Sect. B Metall. M3 - Article ER