Stoichiometry and Texture Evolution of Individual Layers during Accumulative Roll Bonding of Al-Mg Laminated Composites

• Published in: Journal of materials engineering and performance 2023-09, Vol.32 (18), p.8358-8366
• Main Authors: Sarvi, Zohreh, Sadeghi, Alireza, Mosavi Mashhadi, Mahmoud
• Format: Article
• Language: English
• Subjects: Characterization and Evaluation of Materials; Chemistry and Materials Science; Corrosion and Coatings; Engineering Design; Materials Science; Quality Control; Reliability; Safety and Risk; Technical Article; Tribology
• ISSN: 1059-9495; 1544-1024
• DOI: 10.1007/s11665-022-07704-5

Six cycles of ARB at three elevated temperatures (400, 450, and 500 °C) were applied on Al/Mg laminated metallic composites. Samples were studied by microscopy, spectroscopy, and x-ray diffraction to investigate the effect of temperature on microstructures, second phases, and preferred crystallographic orientations. Stoichiometry analysis indicated the formation of non-equilibrium intermetallic phases at the Al/Mg interface. The thickness of the intermetallic layer increased in consecutive passes and by increasing process temperature. Annealing moved the composition toward predicted thermodynamically stable phases by absorbing Al and rejecting excess Mg. EDS examination showed the formation of Al 2 Mg and Al 30 Mg 23 phases in addition to the previously reported Al 12 Mg 17 and Al 3 Mg 2 . XRD results indicated that the preferred crystallographic orientation of the Al layer deviates from the expected plain-strain rolling texture. At the same time, for the Mg layer, the hexagonal c-axis remained parallel to the applied rolling force direction. The most uniform crack-free structure has been formed at 450 °C.