AA1050/AA6061/AA1050 layered sheet was fabricated by cold roll-bonding process and subsequently T4 and T6 aging-treated. Two commercial AA1050 sheets of 1 mm thickness and one AA6061 sheet of 2 mm thickness were stacked up so that an AA6061 sheet was located between two AA1050 sheets. After surface treatments such as degreasing and wire brushing, they were then roll-bonded to a thickness of 2 mm by cold rolling. The roll-bonded Al sheets were then processed by natural aging (T4) and artificial aging (T6) treatments. The as roll-bonded Al sheets showed a typical deformation structure, where the grains are elongated in the rolling direction. However, after the T4 and T6 aging treatments, the Al sheets had a recrystallized structure consisting of coarse grains in both the AA5052 and AA6061 regions with different grain sizes in each. In addition, the sheets showed an inhomogeneous hardness distribution in the thickness direction, with higher hardness in AA6061 than in AA1050 after the T4 and T6 age treatments. The tensile strength of the T6-treated specimen was higher than that of the T4-treated one. However, the strength-ductility balance was much better in the T4-treated specimen than the T6-treated one. The tensile properties of the Al sheets fabricated in the present study were compared with those in a previous study.

1. 서 론
2. 실험 방법
    2.1. 냉간접합압연(cold roll-bonding)
    2.2. 시효처리(age treatment)
    2.3. 특성 평가(characterization)
3. 결과 및 고찰
    3.1. 미세조직(microstructure)
    3.2. 기계적 성질(mechanical properties)
4. 결 론
Acknowledgement
References

• 조상현(국립목포대학교 첨단재료공학과) | Sang-Hyeon Jo (Department of Advanced Materials Science and Engineering, Mokpo National University, Muan 58554, Republic of Korea)
• 이성희(국립목포대학교 첨단재료공학과) | Seong-Hee Lee (Department of Advanced Materials Science and Engineering, Mokpo National University, Muan 58554, Republic of Korea) Corresponding author