Journal
MATERIALS
Volume 14, Issue 13, Pages -Publisher
MDPI
DOI: 10.3390/ma14133473
Keywords
hybride foam; open-cell foam; interfacial fracture toughness; micromechanics; synchrotron diffraction; hybride foam interface
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Funding
- Helmholtz-Zentrum Berlin (HZB)
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation)
- Saarland University
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The study focuses on the interface adhesion between the coating and base foam of nickel/aluminium hybrid foams, using analysis of interface morphology and in situ mechanical testing to develop a reliable research strategy for further improvement of the interface morphology.
Nickel(Ni)/aluminium(Al) hybrid foams are Al base foams coated with Ni by electrodeposition. Hybrid foams offer an enhanced energy absorption capacity. To ensure a good adhering Ni coating, necessary for a shear resistant interface, the influence of a chemical pre-treatment of the base foam was investigated by a combination of an interface morphology analysis by focused ion beam (FIB) tomography and in situ mechanical testing. The critical energy for interfacial decohesion from these microbending fracture tests in the scanning electron microscope (SEM) were contrasted to and the results validated by depth-resolved measurements of the evolving stresses in the Ni coating during three-point bending tests at the energy-dispersive diffraction (EDDI) beamline at the synchrotron BESSY II. Such a multi-method assessment of the interface decohesion resistance with respect to the interface morphology provides a reliable investigation strategy for further improvement of the interface morphology.
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