Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
권호 표지
DOI QR코드

DOI QR Code

Microstructure and Mechanical Properties of Cold Roll-Bonded Layered AA6061/AA5052/AA6061/AA5052 Aluminum Alloy Sheet

냉간압연접합된 층상 AA6061/AA5052/AA6061/AA5052 알루미늄합금판재의 미세조직 및 기계적 성질

  • Jo, Sang-Hyeon (Department of Advanced Materials Science and Engineering, Mokpo National University) ;
  • Park, Bo-Bae (Research Center of Woo Young Marine Company) ;
  • Lee, Seong-Hee (Department of Advanced Materials Science and Engineering, Mokpo National University)
  • 조상현 (국립목포대학교 신소재공학과) ;
  • 박보배 (우영마린연구소) ;
  • 이성희 (국립목포대학교 신소재공학과)
  • Received : 2022.01.24
  • Accepted : 2022.03.14
  • Published : 2022.03.27
Download PDF
⟨ Previous Next ⟩

Abstract

A cold roll-bonding process is applied to fabricate an AA6061/AA5052/AA6061/AA5052 layered sheet. Two AA6061 and one AA5052 sheets of 2mm thickness, 40mm width and 300mm length are alternately stacked, then reduced to a thickness of 2.0 mm by multi-pass cold rolling after surface treatment such as degreasing and wire brushing. The rolling is performed at ambient temperature without lubricant using a 2-high mill with a roll diameter of 400 mm at a rolling speed of 6.0 m/sec. The roll-bonded AA6061/AA5052/AA6061/AA5052 layered sheet is then hardened by natural aging (T4) and artificial aging (T6) treatments. The microstructure of the as-roll bonded and the age-hardened Al sheets was revealed by SEM observation; the mechanical properties were investigated by tensile testing and hardness testing. After T4 and T6 aging treatment, the specimens had a recrystallization structure consisting of coarse equiaxed grains in both AA5052 and AA6061 regions. The as-roll-bonded specimen showed a clad structure in which the hardness of AA5052 regions was higher than that of AA6061 regions. However, after T4 and T6 aging treatment, specimens exhibited different structures, with hardness of AA6061 regions higher than that of AA5052 regions. Strengths of T6 and T4 age-treated specimens were found to increase by 1.55 and 1.36 times, respectively, compared to the value of the starting material.

Keywords

Acknowledgement

This paper has been written with the support of Jeollannam-do ('2020 R&D supporting program' operated by Jeonnam Technopark).

References

  1. S. J. Park, T. Li, C. H. Kim, J. P. Park and S. Y. Chang, Korean J. Mater. Res., 22, 97 (2012). https://doi.org/10.3740/MRSK.2012.22.2.97
  2. S. H. Lee and G. J. Lee, Korean J. Mater. Res., 21, 655 (2011). https://doi.org/10.3740/MRSK.2011.21.12.655
  3. X. Fan, Z. He, W. Zhou and S. Yuan, J. Mater. Process. Technol., 228, 179 (2016). https://doi.org/10.1016/j.jmatprotec.2015.10.016
  4. L. Ding, Y. Weng, S. Wu, R. E. Sansers, Z. Jia and Q. Liu, Mater. Sci. Eng., A, 651, 991 (2016). https://doi.org/10.1016/j.msea.2015.11.050
  5. J. H. Yang, and S. H. Lee, Korean J. Mater. Res., 26, 628 (2016). https://doi.org/10.3740/MRSK.2016.26.11.628
  6. H. S. Ko, S. B. Kang, H. W. Kim and S. H. Hong, Korean J. Met. Mater., 37, 650 (1999).
  7. H. S. Ko, S. B. Kang and H. W. Kim, Korean J. Met. Mater., 37, 891 (1999).
  8. K. D. Woo, H. S. Na, H. J. Mun and I. O. Hwang, Korean J. Met. Mater., 38, 766 (2000).
  9. K. D. Woo, I. O. Hwang and J. S. Lee, Korean J. Met. Mater., 37, 1468 (1999).
  10. C. W. Park and H. Y. Kim, Trans. Korean Soc. Mech. Eng. A, 36, 1675 (2012). https://doi.org/10.3795/KSME-A.2012.36.12.1675
  11. N. J. Park, J. H. Hwang and J. S. Roh, Korean J. Met. Mater., 47, 1 (2009)
  12. C. D. Yim, Y. M. Kim, S. H. Park and B. S. You, Korean J. Met. Mater., 50, 619 (2012). https://doi.org/10.3365/kjmm.2012.50.9.619
  13. D. H. Kim, J. M. Choi, D. H. Jo and I. M. Park, Korean J. Met. Mater., 52, 195 (2014). https://doi.org/10.3365/KJMM.2014.52.3.195
  14. Japan Inst. of Light Metals, Microstructure and Properties of Aluminum Alloys, p.260, Japan (1991).
  15. M. J. Ahn, H. S. You and S. H. Lee, Korean J. Mater. Res., 26, 388 (2016). https://doi.org/10.3740/MRSK.2016.26.7.388
  16. J. Y. Hwang and S. H. Lee, Korean J. Mater. Res., 29, 392 (2019). https://doi.org/10.3740/MRSK.2019.29.6.392