Effect of electromagnetic and ultrasonic cast rolling on microstructure and properties of 1050 aluminum substrate for presensitized plate

SHI Chen(石琛)^{1, 2}, MAO Da-heng(毛大恒)², FU Zong-li(扶宗礼)²

(1. School of Materials Science and Engineering (Central South University), Changsha 410083, China;
2. State Key Laboratory of High Performance and Complex Manufacturing
(Central South University), Changsha 410083, China)

Abstract:The 1050 aluminum alloy strip was prepared by means of electromagnetic and ultrasonic cast rolling on the modified asymmetric twin roll caster, and then the aluminum substrate for presensitized plate was prepared through cold rolling and annealing. the effects of electromagnetic and ultrasonic cast rolling on microstructure, mechanical properties, surface roughness and electrolytic corrosion properties of 1050 aluminum substrate were studied. The results show that electromagnetic and ultrasonic cast rolling can decrease the average crystallite size of aluminum substrate by 5 μm, increase the crystal boundaries with uniform distribution, and make the second-phase particles with smaller size distributed dispersively in the substrate, meanwhile, it can increase the tensile strength, elongation and micro-hardness by 4.58%, 9.85% and HV 2, respectively, reduce the surface roughness, make the surface appearance more even, electrolytic corrosion polarization curve of aluminum substrate more smooth and the surface corrosion pits with regular shape more dispersive.

Key words:1050 aluminum alloy; electromagnetic and ultrasonic cast rolling; microstructure; mechanical properties; electrolytic corrosion property