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MATERIAL SCIENCE
ArticleName Powder technology for manufacturing compact blanks of Ti – Nb – Ta, Ti – Nb – Zr alloys
DOI 10.17580/nfm.2018.02.06
ArticleAuthor Kasimtsev A. V., Yudin A. V., Volodko S. S., Alpatov A. V.
ArticleAuthorData

Metsintez LLC, Tula, Russia:

A. V. Kasimtsev, Director, e-mail: metsintez@yandex.ru
S. N. Yudin, Head of the Process Office, e-mail: Sergey-USN@mail.ru

 

Tula State University, Tula, Russia:
S. S. Volodko, Post-Graduate Student, Chair of Physics of Metals and Science of Materials, e-mail: volodko.sv@yandex.ru

 

A. A. Baikov Institute of Metallurgy and Material Science of the Russian Academy of Sciences, Moscow, Russia:
A. V. Alpatov, Senior Research Officer, Laboratory of Material Diagnostics (No. 17), e-mail: alpat72@mail.ru

Abstract

Presented in the paper are the results of investigating the consolidation process (compacting, sintering, hot isostatic pressing – HIP) of calcium hydride powder of low modulus Ti – Nb alloys doped by tantalum: Ti – 30.1 wt.% Nb – 17.4 wt.% Ta (Ti – 22 at.% Nb – 6 at.% Ta), zirconium: Ti – 33.2 wt.% Nb – 8.6 wt.% Zr (Ti – 22 at.% Nb – 6 at.% Zr) and estimating their mechanical properties. It is shown that metal powders are notable for good compactability on both single-action compacting and isostatic forming. Cold isostatic forming under pressure of 200 MPa permits to obtain briquettes with relative density of 65–68%. Sintering the briquettes at a temperature of 1873 K provides blank formation with porosity of 16 and 8% for Ti – 30.1Nb – 17.4Ta, Ti – 33.2Nb – 8.6Zr (wt.%) alloys, respectively. Sintering in vacuum of 1.33 Pa leads to formation of a gas-filled layer with heightened microhardness to a depth of 8 mm. Sintering in vacuum of 1.33·10–2 Pa allows to avoid this phenomenon. Hot isostatic pressing of the sintered blanks at a temperature of 1193 K and pressure of 150 MPa guarantees obtaining practically porousless material (1% of pores). It is determined that Ti – 30.1Nb – 17.4Ta, Ti – 33.2Nb – 8.6Zr (wt.%) are characterized after sintering by the following values of the yield stress and the Young’s modulus: σ0.2 = 444 ± 7 MPa, E = 57 ± 5 GPa and σ0.2 = 570 ± 29 MPa, E = 62 ± 5 GPa, respectively. After HIP: σ0.2 = 791 ± 16 MPa, E = 87 ± 4 GPa and σ0.2 = 750 ± 50 MPa, E = 81 ± 1 GPa, respectively.

The work was financially supported by the Russian Foundation for Basic Research (Project No. 16-43-710688 р_а). Determination of hydrogen content is performed within the framework of the State task No. 007-00129-18-00.

keywords Titanium alloys, low modulus alloys, compacting, sintering, hot isostatic pressing, porosity, yield stress, the Young’s modulus
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