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Solid-gas reactions driven by mechanical alloying of niobium and tantalum in nitrogen

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Abstract

Solid-gas reactions of niobium and tantalum with molecular nitrogen driven by mechanical alloying (MA) have been investigated by X-ray diffraction, transmission electron microscopy, and differential thermal analysis. It was found that the phase transition followed a sequence of Nb2N → Nb3N4 → NbN when Nb was milled with N2. However, Ta2N and an amorphous phase were formed when Ta was milled with N2. The chemosorption of nitrogen onto the clean metal surfaces created by ball milling is believed to be the fundamental process governing solid-gas reactions, and the defects generated during MA can promote the diffusion of adsorbed nitrogen, and consequently the formation of metal nitrides. The difference in phase transition between the two systems is discussed.

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Authors and Affiliations

  1. State Key Lab of Plastic Forming Stimulation and Die & Mould Technology, Department of Materials Science and Engineering, Huazhong University of Science and Technology, 430074, Wuhan, P.R. China

    L. Liu (Associate Professor)

  2. Department of Production and Engineering, The National University of Singapore, 119260, Singapore

    L. Lu (Senior Lecturer)

  3. Institute of Solid State Physics, Academia Sinica, 230031, Hefei, P.R. China

    L. Chen (Senior Engineer), Y. Qin (Senior Engineer) & L. D. Zhang (Professor)

Authors
  1. L. Liu
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  2. L. Lu
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  3. L. Chen
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  4. Y. Qin
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  5. L. D. Zhang
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Liu, L., Lu, L., Chen, L. et al. Solid-gas reactions driven by mechanical alloying of niobium and tantalum in nitrogen. Metall Mater Trans A 30, 1097–1100 (1999). https://doi.org/10.1007/s11661-999-0161-2

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  • DOI: https://doi.org/10.1007/s11661-999-0161-2

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