Abstract
Aluminum foam sandwiches (AFS) with AlSi10 foam cores and AISI 316L steel skins are manufactured by an in-situ bonding process. The precursor of the core foam was made with the powder compacted method. The precursor and skins, coupled together, were then heated up to the melting point of the Al alloy. The gas released by the blowing agent formed hydrogen bubbles in the melt. producing the foam. Such a porous structure was kept frozen at room temperature via cooling in cold water. To optimize the process conditions, some foaming experiments have been conducted with different holding times and temperatures. Such manufactured AFS were cut, chemically etched and studied with an optical microscope associated with image analysis software to get information about pores morphology in terms of circularity and equivalent diameter. The interface AlSi10-AISI316L has been characterized by SEM and EDX to investigate the bonding conditions between cores and skins. Finally, the AFS have been polished and etched to analyze the microstructure. Quasi-static compressive tests have been performed on the AFS. Obtained results showed that the interface formed during the foaming can be characterized by the inter-diffusion of alloying elements, as confirmed by the good quality of metallurgical joints.
Highlights
Academic Editors: Emanoil Linul, Nima Movahedi, Jeff Th
AlSi10 foams and AISI 316L steel 2sheets hav ployed for the manufacturing of Al-alloy aluminum foam sandwiches (AFS) p foaming, the interface Al foam-steel has been characterized by means of SEM ob sheets kept at a constant distance corresponding to the final one
The steel-precursor joints of the composite and those of steel-foam sandwich were the foaming process in the oven, the external foam walls formed a metallurgic previously investigated via SEM imaging and EDS microanalysis
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Sandwich structures manufacturing is usually obtained by ex-situ bonding [13] In this process, adhesives are employed in order to join together the external skins and the foam in an extremely easy way. The experiments were carried out to manufacture samples The steel-precursor joints of the composite and those of steel-foam sandwich were the foaming process in the oven, the external foam walls formed a metallurgic previously investigated via SEM imaging and EDS microanalysis. EDS analyse carried out on the cross-sections realized by cutting the panels with a diamon cularity and equivalent diameter of the pores, as shown, as a function of the process parameters (time, foaming temperature) with the following relationship: Metals 2021, 11, 1374 where P is. The energy absorbed by the AFS during deformation was calculated by numerical integration of the deformation curve up to 50% strain
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