Synergetic Enhancement of Strength and Ductility for Titanium-based Composites Reinforced with Nickel Metallized Multi-walled Carbon Nanotubes

Dong, L.L., Zhang, W., Fu, Yong Qing, Lu, J.W., Liu, Y. and Zhang, Y.S. (2021) Synergetic Enhancement of Strength and Ductility for Titanium-based Composites Reinforced with Nickel Metallized Multi-walled Carbon Nanotubes. Carbon, 184. pp. 583-595. ISSN 0008-6223

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Poor ductility of titanium matrix composites with medium/high-strength reinforced with carbonaceous nanomaterials (eg., graphene, carbon nanotubes etc.), has seriously restricted their wide-range engineering and practical industry utility. Herein, we propose a new methodology to significantly and simultaneously enhance both ductility and tensile strength of the titanium matrix composites. We ball milled Ti-6Al-4V (TC4) powders with in-situ chemically synthetized Ni decorated multi-walled carbon nanotubes (i.e MWCNTs@Ni), and then sintered the composites powders using spark plasma sintering (SPS). We achieved both a significant balanced between superior strength and increased ductility of the composite using the MWCNTs@Ni nanopowders. The enhanced strength in composites is mainly attributed to the interfacial structures for effectively enhanced load transfer capability between MWCNTs@Ni and Ti matrix, e.g., the formation of coherent/semi-coherent interfaces among interfacial phases Ti2Ni, TiC and Ti matrix. Furthermore, we applied the dislocation theory to reveal the toughening mechanisms of MWCNTs@Ni in the MWCNTs@Ni/TC4 composites. This study provides a new methodology of fabricating metal matrix composites (reinforced with carbon based nanomaterial) with both high strength and good ductility.

Item Type: Article
Additional Information: Funding information: This work was supported by the National Natural Science Foundation of China (No. 51901192), Shaanxi Science Foundation For Distinguished Young Scholars (2020JC-50), Key Research and Development Projects of Shaanxi Province (No. 2019GY-164, 2021GY-214, 2021SF-196), Science and Technology Project of Weiyang District of Xi'an City (No. 201857, No. 202008), Shaanxi Youth Star Program of Science and Technology (No. 2020KJXX-061), and UK Newton Mobility Grant (No. IE161019) through Royal Society and the National Natural Science Foundation of China, as well as Royal academy of Engineering UK-Research Exchange with China and India.
Uncontrolled Keywords: Ti composites, Ni metallized carbon nanotubes, Spark plasma sintering, Strength, Ductility
Subjects: F200 Materials Science
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: John Coen
Date Deposited: 23 Aug 2021 12:29
Last Modified: 20 Aug 2022 03:31

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