Influence of constituent materials on the impact toughness and fracture mechanisms of hot-roll-bonded aluminum multilayer laminates

© The Minerals, Metals & Materials Society and ASM International 2010. Financial support from CICYT (Project Nos. MAT2003-01172 and MAT2006-11202) is gratefully acknowledged. Two of the authors, PH and CMC, thank CSIC for an I3P fellowship and an I3P contract, respectively. We also thank A. García-Delgado for assistance with electron microscopy and C.C. Moreno-Hernández and J.A. Jiménez- Rodríguez for assistance with X-ray diffraction. Finally, the authors make a special mention in memory of P.J. González-Aparicio for his assistance with electron microscopy during all these years.
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.
CICYT
CSIC
Depto. de Física de Materiales
Fac. de Ciencias Físicas
TRUE
pub