Elsevier

Scripta Materialia

Volume 134, June 2017, Pages 91-94
Scripta Materialia

Regular Article
Reaction diffusion rate coefficient derivation by isothermal heat treatment in spark plasma sintering system

https://doi.org/10.1016/j.scriptamat.2017.03.005Get rights and content

Abstract

In spark plasma sintering (SPS) it is widely acknowledged that there are specific physicochemical mechanisms associated with atomic diffusion; however, a reaction diffusion rate coefficient K has yet to be determined. In this work, we derive the K of titanium-copper diffusion couples using isothermal heat treatment of pulsed electric current (PEC), generated in SPS system. Our results show that the derived K for CuTi and Cu4Ti is at least two times higher than the corresponding ones determined under conventional annealing. Accordingly, this work substantiates, for the first time, the argument that PEC accelerates atomic diffusion compared with conventional annealing.

Graphical abstract

The reaction diffusion rate coefficient K for the CuTi and Cu4Ti phases, derived using an approach involving isothermal heat treatment of pulsed electric current (PEC) generated in spark plasma sintering system, is at least two times higher than the corresponding ones determined under conventional annealing (CA) treatment.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Nos. 51574128 and 51627805), the Guangdong Natural Science Foundation for Research Team (No. 2015A030312003), the Guangdong Application-oriented Special Funds for Science and Technology R&D (No. 2016B090931002), the Guangdong Special Funds for Public Welfare Research and Capacity Building (No. 2014A010105020), and by the US Army Research Office (No. W911NF-16-1-0269).

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