Abstract
The discovery of metallic glass ribbons with excellent Yield strength (σys) and Elastic Modulus (Es) has lead to several new technologies and products otherwise impractical or even impossible. However, the alloys are generally high density and brittle, limiting their use in low density, high toughness applications. To reduce density, cellular solids offer promise as a mechanism to employ high strength base materials. Recent research has led to the discovery of amorphous metal honeycombs. Using novel manufacturing approaches, even cell sizes as small as 1 mm have been achieved. Such honeycombs offer a mechanical performance exceeding other similar low density materials. However, to be practical as a future solution for applications ranging from spacecraft to construction, manufacture of the material must be scalable so that significant volumes are produced quickly and cost effectively. The inter-cellular bonding method is critical due to its influence on mechanical strength and weight of the honeycomb. The feasibility and effectiveness of an adhesive and the selected welding techniques for inter-cellular bonding in amorphous Fe45Ni45Mo7B3 honeycombs was investigated. Results from lap-joint tests using adhesive bonding show a wide range of performance. Diffraction results indicated crystallization-induced embrittlement in the ribbons from welding. The embrittled amorphous metal showed significantly inferior mechanical strength. Due to embrittlement of this alloy, adhesives provide the most effective path for production of viable high specific strength materials. However, the weight advantage of welding drives future work to overcome the challenge.
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Acknowledgements
Miyachi Unitek, CA and EWI, OH for laser welding and Resistance spot welding. Sudheer Bandla for XRD measurements. Partial funding also provided by ONR Grant No. N00173-071-G001.
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Jayakumar, B., Allahkarami, M., Hanan, J.C. (2013). Inter-cellular Joining for Amorphous Honeycombs. In: Patterson, E., Backman, D., Cloud, G. (eds) Composite Materials and Joining Technologies for Composites, Volume 7. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-4553-1_3
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DOI: https://doi.org/10.1007/978-1-4614-4553-1_3
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