Accumulative roll bonding of aluminum alloys 2219/5086 laminates: Microstructural evolution and tensile properties

作者：Roy Shibayan; Nataraj B R; Suwas Satyam^*; Kumar S; Chattopadhyay K

来源：MATERIALS %26 DESIGN, 2012, 36: 529-539.

DOI：10.1016/j.matdes.2011.11.015

• Non-ferrous metals and alloys
• Mechanical properties
• Scanning electron microscopy

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 degrees C up to 8 passes with 50% height reduction per pass. A strong bonding between successive layers accompanied by substantial grain refinement (similar to 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 pass 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.

• 出版日期2012-4