Jo Sang-Hyeon, Lee Seong-Hee
Department of Materials Science and Engineering, Mokpo National University, Muan 58554, Republic of Korea.
J Nanosci Nanotechnol. 2021 Sep 1;21(9):4773-4778. doi: 10.1166/jnn.2021.19267.
A cold roll-bonding process was applied to fabricate an AA1050/AA6061/AA5052/AA1050 four-layer clad sheet and subsequently annealed. Three types of aluminum alloy sheets such as AA1050, AA6061 and AA5052 with 2 mm thickness, 40 mm width and 300 mm length were stacked up each other after such surface treatment as degreasing and wire brushing, then reduced to a thickness of 2 mm by multi-pass cold rolling. The rolling was performed at ambient temperature without lubricant using a 2-high mill with a roll diameter of 400 mm at rolling speed of 6.0 m/sec. The roll bonded AA1050/AA6061/AA5052/AA1050 clad sheet was then annealed for 0.5 h at 200~400 °C. Microstructures of the as-roll bonded and subsequently annealed aluminum sheets are investigated by electron back scatter diffraction (EBSD) measurement. After rolling, the roll-bonded AA1050/AA5052/AA6061/AA1050 sheet showed a typical deformation structure that the grains are largely elongated to the rolling direction. However, after annealing, it exhibits a very heterogeneous structure consisting of both deformation structure and recrystallization structure containing nanometer order grains. The formation of this heterogeneous structure and texture with annealing is investigated in detail through EBSD analysis.
采用冷轧复合工艺制备了AA1050/AA6061/AA5052/AA1050四层复合板，并随后进行了退火处理。将三种厚度为2mm、宽度为40mm、长度为300mm的铝合金板材（AA1050、AA6061和AA5052）进行脱脂和钢丝刷等表面处理后相互堆叠，然后通过多道次冷轧减薄至2mm。轧制在室温下无润滑条件下进行，使用直径为400mm的二辊轧机，轧制速度为6.0m/sec。然后将轧制复合的AA1050/AA6061/AA5052/AA1050复合板在200~400°C下退火0.5h。通过电子背散射衍射（EBSD）测量研究了轧制态及随后退火态铝板的微观组织。轧制后，轧制复合的AA1050/AA5052/AA6061/AA1050板材呈现出典型的变形组织，晶粒在很大程度上沿轧制方向拉长。然而，退火后，它呈现出一种非常不均匀的组织，由变形组织和包含纳米级晶粒的再结晶组织组成。通过EBSD分析详细研究了这种不均匀组织和织构随退火的形成过程。
