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2025 Vol.35, Issue 12 Preview Page

Research Paper

Microstructure and Mechanical Properties of AA1050/AA6061 Layered Sheets Processed by Cold Roll-Bonding and Subsequently Annealed

냉간압연접합 후 어닐링된 AA1050/AA6061 층상판재의 미세조직 및 기계적 특성

Hyeon-Jun Heo1
,
Hyo-Sang Yoo2
,
Hyunkyoo Cho3
,
Seong-Hee Lee13†
허 현준1
,
유 효상2
,
조 현규3
,
이 성희13†
1Department of Advanced Materials Science and Engineering, Mokpo National University, Muan 58554, Republic of Korea
2Purpose Built Mobility Group, Korea Institute of Industrial Technology, Suncheon 58022, Republic of Korea
3School of Mechanical and Ocean Engineering, Mokpo National University, Muan 58554, Republic of Korea
1국립목포대학교 첨단재료공학과
2한국생산기술연구원 목적기반모빌리티그룹
3국립목포대학교 기계조선해양공학부
†Corresponding author E-Mail : shlee@mnu.ac.kr (S.-H. Lee, Mokpo Nat’l Univ.)
27 December 2025. pp. 589-596
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Abstract

A cold roll-bonding process using AA1050 and AA6061 sheets, in which the initial strain of AA1050 is higher than that of AA6061, was employed to fabricate an AA1050/AA6061 layered sheet. The sheet was then annealed at various temperatures ranging from 200 to 400 °C. The as-roll-bonded sheet exhibited a typical deformation structure in which the grains were elongated along the rolling direction. The evolution of the microstructure in the layered sheets varied significantly depending on the location, resulting in an inhomogeneous distribution of hardness along the thickness direction. After annealing up to 300 °C, both the AA1050 and AA6061 regions still mainly exhibited a deformed structure. Complete recrystallization occurred in the specimens annealed at temperatures above 350 °C. The hardness decreased with increasing annealing temperature in both AA1050 and AA6061, but the decrease was greater in the AA6061 region than in the AA1050 region. Resultantly, at 350 °C or higher, hardness was almost the same in all regions. The specimen annealed at 350 °C exhibited the best mechanical properties in terms of the balance between tensile strength and elongation. It is concluded that AA1050/AA6061 layered Al sheets with excellent mechanical properties can also be fabricated by CRB when AA1050 has a higher initial strain than AA6061, and subsequent annealing.

Keywords
cold roll-bonding
heterogeneous microstructure
aluminum alloys
mechanical properties
annealing
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Information
  • Publisher :Materials Research Society of Korea
  • Publisher(Ko) :한국재료학회
  • Journal Title :Korean Journal of Materials Research
  • Journal Title(Ko) :한국재료학회지
  • Volume : 35
  • No :12
  • Pages :589-596
  • Received Date : 2025-10-14
  • Revised Date : 2025-10-29
  • Accepted Date : 2025-11-04
  • DOI :https://doi.org/10.3740/MRSK.2025.35.12.589
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