Annealing Behavior of Accumulative Roll Bonding Processed Aluminum Composites

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.

A micro deep drawing of ARB processed aluminium foil AA1235

“…This is the reason why the cup can be drawn deeper without any tear or wrinkles. This result is similar to the findings in Su et al (2013) who annealed at 200°C AA1050 and AA6061 to improve ductility.…”

Preparation and Mechanical Behavior of Ultra-High Strength Low-Carbon Steel

“…The methods of severe plastic deformation (SPD) are an effective means of grain refinement [1][2][3][4], which have been widely used in the preparation of ultra-high strength materials. The SPD methods mainly include cold rolling [5,6], equal channel angular pressing (ECAP) [7][8][9], high-pressure torsion (HPT) straining [10,11], accumulative roll-bonding (ARB) [12][13][14], multidirectional forging (MDF) [15][16][17], etc. Valiev et al [18,19] reported the preparation and application of bulk nanostructured materials from SDP.…”

Thermal stability of Al—0,05 vo1.% Al2O3 nanocomposite fabricated by accumulative roll bonding

“…Дополнительным возможным фактором большего увеличения микротвердости в алюминии без наночастиц по сравнению с нанокомпозитом является перераспределение дислокаций, плотность которых, как было показано в работе [21], в первом случае выше. Для алюминия, полученного многократной прокаткой с сопряжением слоев, рост микротвердости при низкотемпературном отжиге ранее был обнаружен авторами [22].…”