Influence of Constituent Materials on the Impact Toughness and Fracture Mechanisms of Hot-Roll-Bonded Aluminum Multilayer Laminates
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Two aluminum multilayer laminates have been processed by hot roll bonding following similar processing paths. The first one is constituted by alternated Al 2024 and Al 1050 layers (ALH19) and the second one by alternated Al 7075 and Al 1050 layers (ADH19). The influence of the constituent materials in the multilayer laminates both during the processing at high temperature and during the subsequent mechanical characterization has been analyzed. The mechanical behavior of the as-received materials at the processing conditions has been characterized by hot torsion. Multilayer laminates have been tested at room temperature under impact Charpy tests, three-point bend tests, and shear tests on the interfaces. The relative toughness increase compared to the constituent materials was much higher for the ADH19 laminate based on the high-strength Al 7075 alloy than for the ALH19 laminate. This is attributed to the different fracture mechanism.
KeywordsImpact Toughness Constituent Material Torsion Test Laminate Material Charpy Test
Financial support from CICYT (Project Nos. MAT2003-01172 and MAT2006-11202) is gratefully acknowledged. One of the authors (CMC-J) thanks the Spanish National Research Council (CSIC) (Madrid, Spain) for a I3P contract. The authors also thank L. del Real-Alarcón for the welding work, F.F. González-Rodríguez for assistance during hot rolling, and J. Chao-Hermida for assistance with the Charpy impact test. Finally, a special mention is made in memory of P.J. González-Aparicio, for his help and assistance with electron microscopy over many years.
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