Surface modification of Zr–Nb alloy by nanosecond pulse laser processing

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Аннотация

The effect of nanosecond pulse laser processing of the Zr–1% Nb alloy surface of specimens in the annealed state and after their two-stage deformation treatment by abc-pressing and rolling has been investigated. The morphology of the modified surface of specimens is described using optical and scanning microscopy. Furthermore, the microrelief formed as a result of vaporization and melting of a thin layer of material subjected to laser processing is evaluated quantitatively. Durometric measurements were conducted to ascertain the hardness of the near-surface layer and the impact of laser-induced shock waves on its hardness. The electron backscattering diffraction (EBSD) analysis data were employed to describe the structure of the specimens in the near-surface layer. The influence of the initial grain size on the quality of the modified surface, as well as on the depth and hardening of the near-surface layers has been established.

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Авторлар туралы

A. Petrova

Mikheev Institute of Metal Physics, Ural Branch of the Russian Academy of Sciences

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

I. Brodova

Mikheev Institute of Metal Physics, Ural Branch of the Russian Academy of Sciences

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

V. Astafiev

Mikheev Institute of Metal Physics, Ural Branch of the Russian Academy of Sciences

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

D. Rasposienko

Mikheev Institute of Metal Physics, Ural Branch of the Russian Academy of Sciences

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

A. Kuryshev

Mikheev Institute of Metal Physics, Ural Branch of the Russian Academy of Sciences

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

A. Balakhnin

Institute of Continuous Media Mechanics, Ural Branch of the Russian Academy of Sciences

Email: petrova@imp.uran.ru
Ресей, Perm, 614013

S. Uvarov

Institute of Continuous Media Mechanics, Ural Branch of the Russian Academy of Sciences

Email: petrova@imp.uran.ru
Ресей, Perm, 614013

O. Naimark

Institute of Continuous Media Mechanics, Ural Branch of the Russian Academy of Sciences

Email: petrova@imp.uran.ru
Ресей, Perm, 614013

Әдебиет тізімі

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2. Fig. 1. Schematic diagram of the experimental setup (a) and external view of the sample surface treatment (b): 1 – laser head with lens; 2 – laser beam; 3 – laser radiation measurement point on the sample surface; 4 – water, 2 mm layer; 5 – treated sample (front view).

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3. Fig. 2. Results of EBSD analysis of the fine-grain structure of the initial sample made of annealed alloy: a – orientation map; b – map of boundaries of structural elements; c – spectrum of boundaries of structural elements; d – distribution of grains with high-angle boundaries by size; d – distribution of grains and subgrains by size.

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4. Fig. 3. Microstructure of the original ultra-microcrystalline sample. TEM: a – bright field; b – dark field in the 112αZr reflection.

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5. Fig. 4. Tracks on the modified surface of the samples: a – MZ sample; b – UMK sample.

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6. Fig. 5. Crater structure at different magnifications: a, c – MZ sample; b – UMK sample.

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7. Fig. 6. Relief maps of modified surfaces: a – MZ sample; b – UMK sample. The values ​​of depth and height are indicated in µm.

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8. Fig. 7. Relief profiles of the modified surface along the line: a – MZ sample; b – UMK sample.

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9. Fig. 8. Knoop microhardness on the cross-section of samples after laser impact treatment.

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10. Fig. 9. Complete diffraction patterns (a) and a section of diffraction patterns (b) of the MZ and UMC samples, change in the average integral width of X-ray peaks (c) before and after treatment.

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11. Fig. 10. Results of EBSD analysis of the structure of the MG sample after laser processing: a – orientation map; b – map of boundaries of structural elements; c – distribution of grains and subgrains by size; d – spectrum of boundaries of structural elements.

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