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Fabrication, formation mechanism and properties of three-dimensional nanoporous titanium dealloyed in metallic powders

Published online by Cambridge University Press:  02 February 2017

Faming Zhang*
Affiliation:
Jiangsu Key Lab for Advanced Metallic Materials, School of Materials Science and Engineering, Southeast University, 211189 Nanjing, China; and State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, China
Ping Li
Affiliation:
Jiangsu Key Lab for Advanced Metallic Materials, School of Materials Science and Engineering, Southeast University, Nanjing 211189, China
Jin Yu
Affiliation:
Jiangsu Key Lab for Advanced Metallic Materials, School of Materials Science and Engineering, Southeast University, Nanjing 211189, China
Lili Wang
Affiliation:
Jiangsu Key Lab for Advanced Metallic Materials, School of Materials Science and Engineering, Southeast University, Nanjing 211189, China
Farhad Saba
Affiliation:
Jiangsu Key Lab for Advanced Metallic Materials, School of Materials Science and Engineering, Southeast University, Nanjing 211189, China
Ge Dai
Affiliation:
Jiangsu Key Lab for Advanced Metallic Materials, School of Materials Science and Engineering, Southeast University, Nanjing 211189, China
Siyuan He
Affiliation:
School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, China
*
a) Address all correspondence to this author. e-mail: fmzhang@seu.edu.cn
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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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Articles
Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Jürgen Eckert

References

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