Lee Seong-Hee, Kim Jung-Han, Yoo Hyo-Sang, Son Hyeon-Taek
Department of Advanced Materials Science and Engineering, Mokpo National University, Muan-gun 534-729, Jeonnam, Republic of Korea.
Automotive Component and Materials Group, Korea Institute of Industrial Technology, 61012, Korea.
J Nanosci Nanotechnol. 2018 Mar 1;18(3):1948-1952. doi: 10.1166/jnn.2018.15002.
Accumulative roll-bonding (ARB) is the most appropriate process for sheet-shaped materials because it can be carried out readily by utilizing the conventional rolling apparatus. In this study, a nanostructured AA1050/AA5052 Al alloy sheet was successfully fabricated by four-layer stack ARB process. The ARB of AA1050 and AA5052 alloy sheets was performed up to 6 cycles without a lubricant at ambient temperature. The sample fabricated by the ARB was a multi-layer aluminum alloy sheet in which AA1050 and AA5052 layers are alternately stacked. The layer thickness of the each alloy became thinner and elongated to the rolling direction with the number of ARB cycles. The grain size decreased with increasing of the number of ARB cycles, after 6 cycles it became about 180 nm in thickness. The fraction of high angle grain boundaries increased with the number of ARB cycles. The tensile strength also increased with the ARB, it reached 305 MPa which is about 2.1 times that of the as-received AA1050. The mechanical properties of a multi-layer AA1050/AA5052 alloy fabricated by the ARB were compared to those of the other materials.
累积轧制复合（ARB）是适用于片状材料的最合适工艺，因为利用传统的轧制设备即可轻松进行。在本研究中，通过四层堆叠ARB工艺成功制备了一种纳米结构的AA1050/AA5052铝合金板材。在室温下，AA1050和AA5052合金板材的ARB在无润滑剂的情况下进行了6个循环。通过ARB制备的样品是一种多层铝合金板材，其中AA1050和AA5052层交替堆叠。随着ARB循环次数的增加，每种合金的层厚度变薄并沿轧制方向拉长。随着ARB循环次数的增加，晶粒尺寸减小，6个循环后其厚度约为180nm。高角度晶界的比例随着ARB循环次数的增加而增加。抗拉强度也随着ARB而增加，达到305MPa，约为原始AA1050的2.1倍。将通过ARB制备的多层AA1050/AA5052合金的力学性能与其他材料的力学性能进行了比较。
