Accumulative roll bonding of aluminum alloys 2219/5086 laminates: Microstructural evolution and tensile properties |
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| Affiliation: | 1. Centre for Composite Materials and Structures, Harbin Institute of Technology, China;2. University of California, Irvine, USA;3. Dept. of Mechanical Engineering, Hong Kong Polytechnic University, Hung Hom, Hong Kong, China;1. Faculty of Mechanical & Energy Engineering, Shahid Beheshti University, A. C., Tehran, Iran;2. Department of Materials Science and Engineering, Sharif University of Technology, Tehran, Iran;1. Department of Materials Science and Engineering, Faculty of Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran;2. Department of Nano Technology, Nano Materials Group, Semnan University, Semnan, Iran;1. State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha 410083, China;2. School of Mechanical, Materials & Mechatronics Engineering, University of Wollongong, NSW 2500, Australia;3. Electron Microscope Unit, University of New South Wales, Sydney, NSW 2052, Australia;1. Key Laboratory of Metastable Materials Science and Technology, College of Materials Science and Engineering, Yanshan University, Qinhuangdao 066004, China;2. Northeast Light Alloy Co., Ltd., Harbin, Heilongjiang 150060, China |
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| Abstract: | The present study describes the course of microstructure evolution during accumulative roll bonding (ARB) of dissimilar aluminum alloys AA2219 and AA5086. The two alloys were sandwiched as alternate layers and rolled at 300 °C up to 8 passes with 50% height reduction per pass. A strong bonding between successive layers accompanied by substantial grain refinement (～200–300 nm) is achieved after 8 passes of ARB. The processing schedule has successfully maintained the iso-strain condition up to 6 cycles between the two alloys. Afterwards, the fracture and fragmentation of AA5086 layers dominate the microstructure evolution. Mechanical properties of the 8 pas ARB processed material were evaluated in comparison to the two starting alloy sheets via room temperature tensile tests along the rolling direction. The strength of the 8 pass ARB processed material lies between that of the two starting alloys while the ductility decreases after ARB than that of the two constituent starting alloys. These differences in mechanical behavior have been attributed to the microstructural aspects of the individual layer and the fragmentation process. |
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