Mechanical properties and interfacial characteristics of 6061 Al alloy plates fabricated by hot-roll bonding

• Published in: International journal of minerals, metallurgy and materials Vol. 31; no. 8; pp. 1890 - 1899
• Main Authors: Luo, Zongan, Zhang, Xin, Liu, Zhaosong, Zhou, Hongyu, Wang, Mingkun, Xie, Guangming
• Format: Journal Article
• Language: English
• Published: Beijing University of Science and Technology Beijing 01.08.2024; Springer Nature B.V
• Subjects: Aging; Alloys; Aluminum; Aluminum base alloys; Aluminum oxide; Bonded joints; Bonding strength; Boundaries; Ceramics; Characterization and Evaluation of Materials; Chemistry and Materials Science; Composites; Continuous casting; Corrosion and Coatings; Energy consumption; Friction stir welding; Glass; Grain boundaries; Heat treatment; Hot pressing; Hot rolling; Intermetallic compounds; Magnesium compounds; Materials Science; Mechanical properties; Metal plates; Metal silicides; Metallic Materials; Natural Materials; Precipitation heat treatment; R&D; Research & development; Research Article; Roll bonding; Surfaces and Interfaces; Thin Films; Topography; Tribology; Ultimate tensile strength; vacuum; interfacial grain boundaries; mechanical properties; hot-roll bonding; 6061 Al alloy
• ISSN: 1674-4799; 1869-103X
• DOI: 10.1007/s12613-023-2801-8

This work aims to investigate the mechanical properties and interfacial characteristics of 6061 Al alloy plates fabricated by hot-roll bonding (HRB) based on friction stir welding. The results showed that ultimate tensile strength and total elongation of the hot-rolled and aged joints increased with the packaging vacuum, and the tensile specimens fractured at the matrix after exceeding 1 Pa. Non-equilibrium grain boundaries were formed at the hot-rolled interface, and a large amount of Mg 2 Si particles were linearly precipitated along the interfacial grain boundaries (IGBs). During subsequent heat treatment, Mg 2 Si particles dissolved back into the matrix, and Al 2 O 3 film remaining at the interface eventually evolved into MgO. In addition, the local IGBs underwent staged elimination during HRB, which facilitated the interface healing due to the fusion of grains at the interface. This process was achieved by the dissociation, emission, and annihilation of dislocations on the IGBs.