Mechanochemical synthesis of Ni/HfC composite structures

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Abstract

The structural-phase evolution of the mechanochemical formation of Ni/HfC mechanocomposites containing 50 and 70 wt.% nickel was studied using X-ray diffraction analysis, scanning electron microscopy, and energy dispersive spectroscopy. It has been shown by X-ray diffraction analysis, that during mechanochemical synthesis in a ternary mixture of elemental powders Ni, Hf and C at a stoichiometric ratio of Hf and C, the formation of hafnium carbide occurred already after 40 s. For both compositions, the crystallite sizes of the nickel rapidly decrease upon mechanical activation for up to 4 min compared to the initial. Intensive formation of hafnium carbide is recorded during mechanical activation with duration of 4–8 minutes. With mechanical activation for 12 and 20 min, the processes of secondary structure formation lead to homogenization of the product and depletion of hafnium carbide in carbon to the composition HfС0.5.

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About the authors

T. F. Grigoreva

Institute of Solid State Chemistry and Mechanochemistry of the Siberian Branch of the Russian Academy of Sciences

Author for correspondence.
Email: grig@solid.nsc.ru
Russian Federation, Novosibirsk

D. V. Dudina

Institute of Solid State Chemistry and Mechanochemistry of the Siberian Branch of the Russian Academy of Sciences; Lavrentyev Institute of Hydrodynamics of the Siberian Branch of the Russian Academy of Sciences

Email: grig@solid.nsc.ru
Russian Federation, Novosibirsk; Novosibirsk

T. M. Vidyuk

Institute of Solid State Chemistry and Mechanochemistry of the Siberian Branch of the Russian Academy of Sciences; Khristianovich Institute of Theoretical and Applied Mechanics of the Siberian Branch of the Russian Academy of Sciences

Email: grig@solid.nsc.ru
Russian Federation, Novosibirsk; Novosibirsk

S. A. Kovaleva

Joint Institute of Mechanical Engineering of the National Academy of Sciences of Belarus

Email: grig@solid.nsc.ru
Belarus, Minsk

A. V. Ukhina

Institute of Solid State Chemistry and Mechanochemistry of the Siberian Branch of the Russian Academy of Sciences

Email: grig@solid.nsc.ru
Russian Federation, Novosibirsk

E. T. Devyatkina

Institute of Solid State Chemistry and Mechanochemistry of the Siberian Branch of the Russian Academy of Sciences

Email: grig@solid.nsc.ru
Russian Federation, Novosibirsk

S. V. Vosmerikov

Institute of Solid State Chemistry and Mechanochemistry of the Siberian Branch of the Russian Academy of Sciences

Email: grig@solid.nsc.ru
Russian Federation, Novosibirsk

N. Z. Lyakhov

Institute of Solid State Chemistry and Mechanochemistry of the Siberian Branch of the Russian Academy of Sciences

Email: grig@solid.nsc.ru
Russian Federation, Novosibirsk

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Supplementary files

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2. Fig. 1. XRD patterns of the products of mechanochemical synthesis in mixtures of nickel, hafnium, carbon powders containing 50 (a, c) and 70 wt.% Ni (b, d)

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3. Fig. 2. Change in the size L of crystallites (a) and the parameter a of the nickel crystal lattice (b) depending on the duration τМА of mechanical treatment of mixtures with different nickel content (formula for mixture [(100–x)(Hf+C)]+xNi)

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4. Fig. 3. SEM (BSE) micrographs of powder mixtures of two compositions after 40 s of MA: a, b – 50 and 70 wt.% Ni, respectively

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5. Fig. 4. SEM (BSE) micrographs of powder mixtures of two compositions after 4 min MA: a, b – 50 and 70 wt.% Ni, respectively

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6. Fig. 5. SEM (BSE) micrographs of powder mixtures of two compositions after 20 min MA: a, b – 50 and 70 wt.% Ni, respectively

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