Abstract
We present a novel route to fabricate 3D nanoporous α-Ti foams by dealloying of TiCu master alloy in solid state using Mg powders. Pure open-cell nanoporous α-Ti foams are fabricated with BET surface area of 34.4 ± 0.8 m2/g and pore size in the range of 2–50 nm. The dealloying using powders is a solid state chemical reaction process to form Cu2Mg phase and Ti/Mg nanocomposites. The constituent of Cu in the TiCu alloy was dissolved into Mg powders thanks to the kinetics of interface reaction and volume diffusion. The pore-forming mechanism is a solid-state interdiffusion process. The ligament coarsening is from 492 to 650 nm with increasing of the dealloying temperature. The hardness and elastic modulus in nanoporous α-Ti foam follow linear decay fit with ligament size increasing. Our results demonstrate a facile strategy for the fabrication of nanoporous Ti foams with novel nanostructures and tailored properties.
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ACKNOWLEDGMENTS
The authors gratefully acknowledge the financial supports from the State Key Laboratory for Powder Metallurgy at Central South University, Natural Science Foundation of Jiangsu Province (No. BK20161419), Scientific Research Foundation for the Returned Overseas Chinese Scholars at State Education Ministry (No. 2015-1098), National Natural Science Foundation of China (No. 11572087), Jiangsu Key Laboratory for Advanced Metallic Materials (No. BM2007204) at Southeast University, and the Fundamental Research Funds for the Central Universities (No. 2242016K40013).
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Zhang, F., Li, P., Yu, J. et al. Fabrication, formation mechanism and properties of three-dimensional nanoporous titanium dealloyed in metallic powders. Journal of Materials Research 32, 1528–1540 (2017). https://doi.org/10.1557/jmr.2017.19
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DOI: https://doi.org/10.1557/jmr.2017.19