Investigation of the structure of Ti-40Nb powder alloy obtained by mechanical activation
- Authors: Kovalevskaya Z.G1,2, Sharkeev Y.P2,1, Korchagin M.A3,4, Khimich M.A4,2, Ibragimov E.A5, Saprykin A.A5, Bataev V.A6
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Affiliations:
- National Research Tomsk Polytechnic University
- Institute of Strength Physics and Materials Science Siberian Branch of Russian Academy of Sciences
- Institute of Solid State Chemistry and Mechanochemistry Siberian Branch of Russian Academy of Sciences
- National Research Tomsk State University
- Yurga Technical Institute of Tomsk Polytechnic University
- Novosibirsk State Technical University
- Issue: No 4 (2016)
- Pages: 34-42
- Section: MATERIAL SCIENCE
- URL: https://journal-vniispk.ru/1994-6309/article/view/302145
- DOI: https://doi.org/10.17212/1994-6309-2016-4-34-42
- ID: 302145
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Abstract
Powder alloys obtained by mechanical activation are widely used in different fields. One of these fields is additive technology. The resulting material for such purpose should have a size distribution of 10…50 µm, nearly spherical particles shape and phase composition close to the composition of the alloy obtained by melting. The powder Ti-Nb alloy is consisted of Ti and Nb powders mixture with weight ratio of 60:40 respectively, grinded in a planetary ball mill AGO-2C in argon atmosphere. The structure and phase composition of obtained powder alloy are defined by mechanical activation time and the presence of protective gas environment. The size of formed particles increases up to average value of 66 µm at activation time increasing from 3 to 20 minutes and it decreases twice at activation time of 25 minutes. The shape of particles changes from scaly to pellet. The quantity of total solid solution of Ti and Nb components increases in the alloy with increasing the activation time. The β-single phase alloy is identified by x-ray at activation time of 20 minutes. Plastic deformation is accompanied by relaxation processes of diffusion type and occurs during mechanical activation. The process of agglomeration begins to predominate over the process of destruction. As a result, the average size of resulting powder particles increases with increasing the treatment time and sticking of powder material to the vial walls is observed. The balancing of agglomeration and destruction process occurs at activation time of 25 minutes. This leads to the average size of obtained particles decreasing. Significant increment of accumulated strain energy creates conditions for abnormal mass transfer of components atoms into the crystal lattice of each other. Also it creates conditions for the formation of monophase alloy, which consists of a total solid solution of β-TiNb. This solid solution exists in a range of concentrations. It is necessary to investigate ratio of technological parameters of mechanical activation, granulometric and phase composition of resulting powder in case when investigated powder is used in the process of selective laser melting.
About the authors
Zh. G Kovalevskaya
National Research Tomsk Polytechnic University; Institute of Strength Physics and Materials Science Siberian Branch of Russian Academy of Sciences
Email: zhanna_kovalevskaya@mail.ru
30, Lenin Avenue, Tomsk, 634050, Russian Federation; 2/4, pr. Akademicheskii, Tomsk, 634055, Russian Federation
Yu. P Sharkeev
Institute of Strength Physics and Materials Science Siberian Branch of Russian Academy of Sciences; National Research Tomsk Polytechnic University
Email: sharkeev@ispms.tsc.ru
2/4, pr. Akademicheskii, Tomsk, 634055, Russian Federation; 30, Lenin Avenue, Tomsk, 634050, Russian Federation
M. A Korchagin
Institute of Solid State Chemistry and Mechanochemistry Siberian Branch of Russian Academy of Sciences; National Research Tomsk State University
Email: korchag@solid.nsc.ru
18, Kutateladze st., Novosibirsk, 630128, Russian Federation; 36, Lenin Avenue, Tomsk, 634050, Russian Federation
M. A Khimich
National Research Tomsk State University; Institute of Strength Physics and Materials Science Siberian Branch of Russian Academy of Sciences
Email: khimich@ispms.tsc.ru
36, Lenin Avenue, Tomsk, 634050, Russian Federation; 2/4, pr. Akademicheskii, Tomsk, 634055, Russian Federation
E. A Ibragimov
Yurga Technical Institute of Tomsk Polytechnic University
Email: egor83@list.ru
26, Leningradskaya st., Yurga, 652055, Russian Federation
A. A Saprykin
Yurga Technical Institute of Tomsk Polytechnic University
Email: sapraa@tpu.ru
26, Leningradskaya st., Yurga, 652055, Russian Federation
V. A Bataev
Novosibirsk State Technical University
Email: bataev@adm.nstu.ru
20, Prospekt K. Marksa, Novosibirsk, 630073, Russian Federation
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