Influence of Silicon on the Structure and Hardness of Biomedical Ti–18Nb–4Zr–xSi Alloys in the As-Cast State and After Quenching

We study the biomedical Ti–18Nb–4Zr– x Si cast alloys with a silicon content of 0.5–1.5 wt.%. Quenching in water was carried out within the temperature range 900–1200°С with durations of holding equal to 5 min and 1 h. It is discovered that the procedure of heating of these alloys to the temperature...

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Veröffentlicht in:Materials science (New York, N.Y.) N.Y.), 2022-09, Vol.58 (2), p.180-189
Hauptverfasser: Shevchenko, O. М., Kulak, L. D., Кuzmenко, М. М., Kotko, А. V., Firstov, S. О.
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container_title Materials science (New York, N.Y.)
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creator Shevchenko, O. М.
Kulak, L. D.
Кuzmenко, М. М.
Kotko, А. V.
Firstov, S. О.
description We study the biomedical Ti–18Nb–4Zr– x Si cast alloys with a silicon content of 0.5–1.5 wt.%. Quenching in water was carried out within the temperature range 900–1200°С with durations of holding equal to 5 min and 1 h. It is discovered that the procedure of heating of these alloys to the temperatures of quenching leads to the decay of nonequilibrium phases, and the silicon content is redistributed between the phases in a solid solution and silicides. Since almost all silicon is bound with zirconium and titanium and form silicides, the hardness of the Ti–18Nb–4Zr– x Si alloys mainly depends on the amount of silicides and constitutes 26–28 HRC. Moreover, its maximum values are reached for the alloys with eutectoid compositions containing 0.8–1.2 wt.% Si characterized by the most intense release of finely divided silicides. The increase in the silicon content of the hypereutectoid alloys leads to an increase in the sizes of silicides, as well as to the formation of larger amounts of the β-phase in the as-cast Ti–18Nb–4Zr– x Si alloys, and as a result, their hardness noticeably decreases. For low quenching temperatures (within the range 900–1000°C), the complete eutectoid destruction accompanied by the formation of relatively large stable (Ti, Zr) 3 Si silicides leads to a decrease in hardness < 25 HRC. In the course of quenching of the as-cast Ti–18Nb–4Zr– x Si alloys at temperatures ≥ 1100°C, we observe the formation of more finely divided silicides, which increases the level of hardness of the eutectoid alloys up to 38–39 HRC. The observed changes in the parameters of the α″-phase demonstrate that, as a result of partial dissolution of silicides in the course of quenching at 1200°C, silicon passes into a solid solution and the amount of large silicides on the grain boundaries increases. Therefore, the level of hardness of the analyzed quenched alloys decreases.
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Moreover, its maximum values are reached for the alloys with eutectoid compositions containing 0.8–1.2 wt.% Si characterized by the most intense release of finely divided silicides. The increase in the silicon content of the hypereutectoid alloys leads to an increase in the sizes of silicides, as well as to the formation of larger amounts of the β-phase in the as-cast Ti–18Nb–4Zr– x Si alloys, and as a result, their hardness noticeably decreases. For low quenching temperatures (within the range 900–1000°C), the complete eutectoid destruction accompanied by the formation of relatively large stable (Ti, Zr) 3 Si silicides leads to a decrease in hardness &lt; 25 HRC. In the course of quenching of the as-cast Ti–18Nb–4Zr– x Si alloys at temperatures ≥ 1100°C, we observe the formation of more finely divided silicides, which increases the level of hardness of the eutectoid alloys up to 38–39 HRC. The observed changes in the parameters of the α″-phase demonstrate that, as a result of partial dissolution of silicides in the course of quenching at 1200°C, silicon passes into a solid solution and the amount of large silicides on the grain boundaries increases. 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In the course of quenching of the as-cast Ti–18Nb–4Zr– x Si alloys at temperatures ≥ 1100°C, we observe the formation of more finely divided silicides, which increases the level of hardness of the eutectoid alloys up to 38–39 HRC. The observed changes in the parameters of the α″-phase demonstrate that, as a result of partial dissolution of silicides in the course of quenching at 1200°C, silicon passes into a solid solution and the amount of large silicides on the grain boundaries increases. 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О.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Influence of Silicon on the Structure and Hardness of Biomedical Ti–18Nb–4Zr–xSi Alloys in the As-Cast State and After Quenching</atitle><jtitle>Materials science (New York, N.Y.)</jtitle><stitle>Mater Sci</stitle><date>2022-09-01</date><risdate>2022</risdate><volume>58</volume><issue>2</issue><spage>180</spage><epage>189</epage><pages>180-189</pages><issn>1068-820X</issn><eissn>1573-885X</eissn><abstract>We study the biomedical Ti–18Nb–4Zr– x Si cast alloys with a silicon content of 0.5–1.5 wt.%. Quenching in water was carried out within the temperature range 900–1200°С with durations of holding equal to 5 min and 1 h. It is discovered that the procedure of heating of these alloys to the temperatures of quenching leads to the decay of nonequilibrium phases, and the silicon content is redistributed between the phases in a solid solution and silicides. Since almost all silicon is bound with zirconium and titanium and form silicides, the hardness of the Ti–18Nb–4Zr– x Si alloys mainly depends on the amount of silicides and constitutes 26–28 HRC. Moreover, its maximum values are reached for the alloys with eutectoid compositions containing 0.8–1.2 wt.% Si characterized by the most intense release of finely divided silicides. The increase in the silicon content of the hypereutectoid alloys leads to an increase in the sizes of silicides, as well as to the formation of larger amounts of the β-phase in the as-cast Ti–18Nb–4Zr– x Si alloys, and as a result, their hardness noticeably decreases. For low quenching temperatures (within the range 900–1000°C), the complete eutectoid destruction accompanied by the formation of relatively large stable (Ti, Zr) 3 Si silicides leads to a decrease in hardness &lt; 25 HRC. In the course of quenching of the as-cast Ti–18Nb–4Zr– x Si alloys at temperatures ≥ 1100°C, we observe the formation of more finely divided silicides, which increases the level of hardness of the eutectoid alloys up to 38–39 HRC. The observed changes in the parameters of the α″-phase demonstrate that, as a result of partial dissolution of silicides in the course of quenching at 1200°C, silicon passes into a solid solution and the amount of large silicides on the grain boundaries increases. Therefore, the level of hardness of the analyzed quenched alloys decreases.</abstract><cop>New York</cop><pub>Springer US</pub><doi>10.1007/s11003-022-00647-1</doi><tpages>10</tpages></addata></record>
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subjects Alloys
Analysis
Casting alloys
Characterization and Evaluation of Materials
Chemistry and Materials Science
Computer animation
Computer programs
Eutectoid alloys
Eutectoid composition
Eutectoid temperature
Grain boundaries
Hardness
Intermetallic compounds
Materials Science
Mechanical properties
Quenching
Silicides
Silicon
Solid Mechanics
Solid solutions
Specialty metals industry
Structural Materials
Titanium
Zirconium
Zirconium alloys
title Influence of Silicon on the Structure and Hardness of Biomedical Ti–18Nb–4Zr–xSi Alloys in the As-Cast State and After Quenching
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