Obrabotka Metallov. 2016 no. 4(73)

ОБРАБОТКА МЕТАЛЛОВ № 4 (73) 2016 41 МАТЕРИАЛОВЕДЕНИЕ Saprykin A.A. 5 , Ph.D. (Engineering), Head of FM, e-mail: sapraa@tpu.ru Bataev V.A. 6 , D.Sc. (Engineering) Professor, e-mail: bataev@adm.nstu.ru 1 National Research Tomsk Polytechnic University, 30 Lenin Avenue, Tomsk, 634050, Russian Federation 2 Institute of Strength Physics and Materials Science Siberian Branch of Russian Academy of Sciences, 2/4 pr. Akademicheskii, Tomsk, 634055, Russian Federation 3 Institute of Solid State Chemistry and Mechanochemistry Siberian Branch of Russian Academy of Sciences, 18 Kutateladze st., Novosibirsk, 630128, Russian Federation 4 National Research Tomsk State University, 36 Lenin Avenue, Tomsk, 634050, Russian Federation 5 Yurga Technical Institute of Tomsk Polytechnic University, 26 Leningradskaya st., Yurga, 652055, Russian Federation 6 Novosibirsk State Technical University, 20 Prospekt K. Marksa, Novosibirsk, 630073, Russian Federation 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, grind- ed 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 treat- ment time and sticking of powder material to the vial walls is observed. The balancing of agglomeration and destruc- tion 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 re- sulting powder in case when investigated powder is used in the process of selective laser melting. Keywords titanium, niobium, powder mixture, mechanical activation, severe plastic deformation, agglomeration, phase composition, Ti-40Nb alloy DOI: 10.17212/1994-6309-2016-4-34-42 References 1.  Zlenko M.A., Popovich A.A., Mutylina I.N. Additivnye tekhnologii v mashinostroenii [Additive technologies in engineering]. St. Petersburg, St. Petersburg Polytechnic University Publ., 2013. 222 p. 2. Saprykin A.A., Ibragimov E.A., Yakovlev V.I. Influence of mechanical activation of powder on SLS process. Applied Mechanics and Materials, 2014, vol. 682, pp. 143–147. doi: 10.4028/www.scientific.net/AMM.682.143 3. Zhuravleva K., Scudino S., Khoshkhoo M.S., Gebert A., Calin M., Schultz L. Mechanical alloying of β-type Ti-Nb for biomedical applications. Advanced Engineering Materials , 2013, vol. 15, no. 4, pp. 262–268. doi: 10.1002/ adem.201200117 4. Suryanarayana C. Mechanical alloying and milling. Progress in materials science, 2001, vol. 46, iss. 1–2, pp. 1–184. doi: 10.1016/S0079-6425(99)00010-9 5. Kuz’mich Yu.V., Kolesnikova I.T., Serba V.I., Freidin B.M. Mekhanicheskoe legirovanie [Mechanical alloy- ing]. Moscow, Nauka Publ., 2005. 213 p. ISBN 5-02-033726-9 6. Maweja K., Phasha M., Berg N. van der. Microstructure and crystal structure of an equimolar Mg-Ti alloy processed by simoloyer high-energy ball mill. Powder technology , 2010, vol. 199, iss. 3, pp. 256–263. doi: 10.1016/j. powtec.2010.01.014