Microstructural evolution and mechanical property of AA5050 alloy deformed by accumulative roll bonding

Authors

Kuiyu Cheng, University of WollongongFollow
Cheng Lu, University of WollongongFollow
A Kiet Tieu, University of WollongongFollow
Hongtao Zhu, University of WollongongFollow

RIS ID

89900

Publication Details

Cheng, K., Lu, C., Tieu, A. K. & Zhu, H. (2014). Microstructural evolution and mechanical property of AA5050 alloy deformed by accumulative roll bonding. Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science, 45B (2), 399-403.

Abstract

In this study, ultrafine-grained AA5050 sheets were fabricated by the accumulative roll bonding (ARB) process. Transmission electron microscope observations showed that at the early stage of ARB, the grain size was reduced in the normal direction and became elongated along the rolling direction. The elongated grains were cut out by dense dislocations, which then tangled and condensed, resulting in the formation of dislocation cells. As the deformation proceeded, the dislocation cells evolved to sub-grain boundaries and then grain boundaries. The ultrafinegrained microstructure was obtained via four ARB cycles. The tensile tests at 473 K and 523 K (200 degrees C and 250 degrees C) showed large elongations for strain rates of 1 × 103 s-1 and 1 × 104 s-1