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Effects of Applied Pressure on the Atomic Diffusion Coefficient During Spark Plasma Sintering of Crystalline Powders

  • Characterization of Advanced Sintering Materials
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Abstract

We report on the establishment of a framework to determine the value of the pressure-related atomic diffusion coefficient, D, and its use. Moreover, we clarify the underlying relationships between the as-determined D and the active densification mechanisms during crystalline powder sintering. During spark plasma sintering, the theoretical framework is validated by comparing the densification behaviors of Ti40.6Zr9.4Cu37.5Ni9.4Sn3.1 crystalline alloy powders with two types of particle sizes. Our results demonstrate quantitatively that the superimposition of an applied pressure enhances the atomic diffusion to promote densification during crystalline powder sintering.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (No. 51574128), 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 Fundamental Research Funds for the Central Universities (No. 2017PY014) and the National Natural Science Foundation of China (No. 51504072).

Conflict of interest

All authors declare that they have no conflict of interest.

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Authors and Affiliations

  1. National Engineering Research Center of Near-net-shape Forming for Metallic Materials, South China University of Technology, Guangzhou, 510640, China

    Xinxin Li, Chao Yang, Zhao Liu, Zhi Wang & Weiwen Zhang

  2. Guangdong Key Laboratory for Processing and Forming of Advanced Metallic Materials, South China University of Technology, Guangzhou, 510640, China

    Xinxin Li & Chao Yang

  3. Guangdong Institute of Materials and Processing, Guangdong Academy of Sciences, Guangzhou, 510650, China

    Liming Zou

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  1. Xinxin Li
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  2. Chao Yang
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  3. Zhao Liu
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  4. Liming Zou
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  5. Zhi Wang
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  6. Weiwen Zhang
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Correspondence to Chao Yang.

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Li, X., Yang, C., Liu, Z. et al. Effects of Applied Pressure on the Atomic Diffusion Coefficient During Spark Plasma Sintering of Crystalline Powders. JOM 71, 2475–2483 (2019). https://doi.org/10.1007/s11837-019-03393-z

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  • DOI: https://doi.org/10.1007/s11837-019-03393-z

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