Abstract
Tungsten is one of best candidates for plasma facing materials (PFMs) in fusion reactors. But its application in fusion areas is strongly restricted by the inherent brittleness and high ductile–brittle transition temperature. To improve the toughness of W-based materials, W/TiN/Ta-laminated composites were fabricated by spark plasma sintering. Three-point bending test was performed to investigate the bending mechanical properties. Multiple crack propagation is the main crack propagation mode in W/TiN/Ta composites. Energy dissipation by interfacial debonding and crack deflection at interfaces as well as crack bridging by Ta foils and plastic deformation of Ta can contribute to the toughening of W/TiN/Ta composites. The existence of interfacial TiN coatings can act as weak points and promote interfacial debonding. TiN coatings with (111) preferred orientation are found to be conducive to the strengthening of W/TiN/Ta composites.
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Acknowledgements
This work was financially supported by the National Magnetic Confinement Fusion Program (No. 2013GB110005) and the Natural Science Foundation of China Program (No. 51571095).
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Xu, GY., Zhou, T., Zhang, Y. et al. Bending mechanical properties of W/TiN/Ta composites with interfacial TiN coatings. Rare Met. 42, 1718–1723 (2023). https://doi.org/10.1007/s12598-018-1114-y
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DOI: https://doi.org/10.1007/s12598-018-1114-y