Annealing Behavior of Accumulative Roll Bonding Processed Aluminum Composites. Issue 12 (19th June 2013)

• Record Type: Journal Article
• Authors: Su, Lihong; Lu, Cheng; Tieu, Kiet; Deng, Guanyu
• Other Names: Tieu A. Kiet sponsoringEditor.; Zhu Hongtao sponsoringEditor.; Zhu Qiang sponsoringEditor.
• Is Part Of: Steel research international. Volume 84:Issue 12(2013:Dec.)
• Page Start: 1241
• Page End: 1245
• Publication Date: 2013-06-19
• Subjects: accumulative roll bonding -- annealing -- laminated composites; Steel -- Periodicals; Steel -- Metallurgy -- Periodicals; 669.142
• DOI: 10.1002/srin.201300032
• Languages: English
• ISSNs: 1611-3683

Abstract

Abstract : Accumulative roll bonding (ARB) is an effective method to produce ultrafine‐grained (UFG) sheet materials with high strength. In this work, the ARB process up to five cycles was performed to the starting materials AA1050 and AA6061 and produced three different laminates: AA1050/AA1050, AA6061/AA6061, and AA1050/AA6061. The grain size of AA1050 and AA6061, in all laminates, was reduced significantly after ARB deformation. Meanwhile, a remarkable enhancement in the hardness was achieved. The materials were annealed at different conditions and the microstructures and mechanical properties of the materials were investigated. Static annealing was carried out at temperatures of 100–400°C for 30 min in order to examine the thermal stability of the aluminum alloy. The grain size and hardness evolution of both the AA1050 and AA6061 alloys, in all the three laminates, showed a similar change with the annealing temperature. Annealing induced hardening was observed at 100°C for all the materials examined, and the microstructure of the alloys stayed almost the same as the as‐deformed alloys. The materials softening started after annealing at 150°C, and the hardness decreased rapidly between 150 and 300°C and then stayed stable. The change of the hardness values with the annealing time at low temperature was nearly negligible. The hardness and grain size values of the AA1050 and AA6061 in both the monotonic laminates and composite are similar. Abstract : Upon annealing at 100°C for 30 min, hardening by annealing occurrs for all the ARB deformed materials, although the increment for AA6061 is larger [curve (a) and (b)] than AA1050 [curve (c) and (d)]. Slight softening is observed after annealing at 150°C. However, the decrement in hardness is not obvious until annealing at 200°C and above.