Effect of chromium content on the thermal stability of single-phase submicrocrystalline Ni–Cr alloys

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Аннотация

The thermal stability of single-phase Ni–Cr alloys (with 2, 5, and 12.5 at % Cr), in which the submicrocrystalline (SMC) structure is formed by high-pressure torsion, is studied. Annealing-induced variations of the hardness and grain size, and changing the uniformity of recrystallized structure are analyzed. The alloying of nickel with chromium increases the temperature of the onset of recrystallization of deformed alloy by 150–250°С and temperature of the onset of active grain growth by 200–400°С in accordance with the increase in the chromium content. The recrystallization of the studied SMC alloys develops via the priority growth of individual nuclei. The increase in the chromium content in the alloys from 2 to 12.5% favors the decrease in the grain size and increase in the size uniformity of the recrystallized structure.

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Авторлар туралы

K. Karamyshev

M.N. Miheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences

Хат алмасуға жауапты Автор.
Email: highpress@imp.uran.ru
Ресей, Ekaterinburg, 620108

L. Voronova

M.N. Miheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences

Email: highpress@imp.uran.ru
Ресей, Ekaterinburg, 620108

T. Chashchukhina

M.N. Miheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences

Email: highpress@imp.uran.ru
Ресей, Ekaterinburg, 620108

M. Degtyarev

M.N. Miheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences

Email: highpress@imp.uran.ru
Ресей, Ekaterinburg, 620108

Әдебиет тізімі

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2. Fig. 1. Microstructure of Ni–12.5Cr (a) and Ni–2Cr (b) alloys after SPD deformation and the dependence of the average size of microcrystallites on the chromium content (c); a, b – dark-field images in the (111)γ reflection, TEM.

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3. Fig. 2. The effect of chromium alloying on the hardness of nickel during SPD deformation and subsequent annealing.

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4. Fig. 3. Microstructure of nickel (a) and Ni–2Cr alloy (b) after SPD deformation and annealing at 200°C for 1 h; a – EBSD map of grains in random colors, SEM; b – dark-field image in the (111)γ reflection, TEM.

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5. Fig. 4. Microstructure (a, c) and histogram of grain distribution by misorientation angles (b) of the Ni–2Cr alloy and microstructure of Ni–5Cr (d) and Ni–12.5Cr (d) alloys after SPD deformation and annealing at 300°C for 1 h; a – EBSD map of grains in random colors, SEM; c, d – bright-field images, TEM.

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6. Fig. 5. Microstructure of Ni–2Cr (a, b), Ni–5Cr (c, d) and Ni–12.5Cr (d) alloys after SPD deformation and annealing at 400°C for 1 h; a, c – EBSD maps of grains in random colors, SEM; b, d, d – bright-field images, TEM.

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7. Fig. 6. Microstructure of Ni–5Cr (a–g) and Ni–12.5Cr (d, e) alloy after SPD deformation and annealing at 500°C (a, b) and 600°C (c–f), 1 h; a, c, d – EBSD maps of grains in arbitrary colors, SEM, b, d, e – bright-field images, TEM.

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8. Fig. 7. Effect of chromium alloying on the average grain size of nickel after SPD deformation and annealing.

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9. Fig. 8. Histograms of grain size distribution in Ni (a) and Ni–2Cr alloy (b–d) after SPD deformation and annealing at 200°C (a, b); 300°C (c); 400°C (d).

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10. Fig. 9. Histograms of grain size distribution in Ni–5Cr and Ni–12.5Cr alloys after SPD deformation and annealing at 300–600°C.

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