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Data on the early oxidation of SiO₂-coated pure Ti and bulk Ti₅Si₃ at 800?°C.

ABSTRACT: Oxidation of pure Ti sputtered with a 250?nm layer of amorphous SiO₂ and bulk Ti₅Si₃ was conducted at 800?°C for 2 or 32?h in a 1 standard cubic centimeter per minute (SCCM) O₂/4 SCCM Ar environment (approximately pO₂ = 0.2?atm/20.3?kPa). Specimens were characterized using transmission electron microscopy, scanning transmission electron microscopy, and energy dispersive spectroscopy. The data in this article accompanies research article "Early oxidation behavior of Si-coated titanium" [1], which contains further discussion. The data for this article is hosted at the Materials Commons data repository and is available for download at https://materialscommons.org/mcapp/#/data/dataset/b8bc8038-a735-4cb9-9a9e-a0fb912b248c.

SUBMITTER: Chou K

PROVIDER: S-EPMC6143759 | biostudies-literature | 2018 Oct

REPOSITORIES: biostudies-literature

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Data on the early oxidation of SiO2-coated pure Ti and bulk Ti5Si3 at 800 °C.

Chou Kathleen K Chu Peng-Wei PW Marquis Emmanuelle A EA

Data in brief 20180901

Oxidation of pure Ti sputtered with a 250 nm layer of amorphous SiO2 and bulk Ti5Si3 was conducted at 800 °C for 2 or 32 h in a 1 standard cubic centimeter per minute (SCCM) O2/4 SCCM Ar environment (approximately pO2 = 0.2 atm/20.3 kPa). Specimens were characterized using transmission electron microscopy, scanning transmission electron microscopy, and energy dispersive spectroscopy. The data in this article accompanies research article "Ear ...[more]

PMID: 30238037

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Project description:Coating system(s) will be required for Nb-silicide based alloys. Alumina forming alloys that are chemically compatible with the Nb-silicide based alloy substrate could be components of such systems. The intermetallic alloys Nb1.45Si2.7Ti2.25Al3.25Hf0.35 (MG5) and Nb1.35Si2.3Ti2.3Al3.7Hf0.35 (MG6) were studied in the cast, heat treated and isothermally oxidised conditions at 800 and 1200 °C to find out if they are αAl₂O₃ scale formers. A (Al/Si)alloy versus Nb/(Ti + Hf)alloy map, which can be considered to be a map for Multi-Principle Element or Complex Concentrated Nb-Ti-Si-Al-Hf alloys, and a [Nb/(Ti + Hf)]Nb5Si3 versus [Nb/(Ti + Hf)]alloy map were constructed making use of the alloy design methodology NICE and data from a previously studied alloy, and were used to select the alloys MG5 and MG6 that were expected (i) not to pest, (ii) to form αAl₂O₃ scale at 1200 °C, (iii) to have no solid solution, (iv) to form only hexagonal Nb₅Si₃ and (v) to have microstructures consisting of hexagonal Nb₅Si₃, Ti₅Si₃, Ti₅Si₄, TiSi silicides, and tri-aluminides and Al rich TiAl. Both alloys met the requirements (i) to (v). The alumina scale was able to self-heal at 1200 °C. Liquation in the alloy MG6 at 1200 °C was linked with the formation of a eutectic like structure and the TiAl aluminide in the cast alloy. Key to the oxidation of the alloys was the formation (i) of "composite" silicide grains in which the Nb₅Si₃ core was surrounded by the Ti₅Si₄ and TiSi silicides, and (ii) of tri-aluminides with high Al/Si ratio, particularly at 1200 °C and very low Nb/Ti ratio forming in-between the "composite" silicide grains. Both alloys met the "standard definition" of high entropy alloys (HEAs). Compared with HEAs with bcc solid solution and intermetallics, the VEC values of both the alloys were outside the range of reported values. The parameters VEC,  and  of Nb-Ti-Si-Al-Hf coating alloys and non-pesting Nb-silicide based alloys were compared and trends were established. Selection of coating alloys with possible "layered" structures was discussed and alloy compositions were proposed.

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Data on the early oxidation of SiO₂-coated pure Ti and bulk Ti₅Si₃ at 800?°C.

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Data on the early oxidation of SiO<sub>2</sub>-coated pure Ti and bulk Ti<sub>5</sub>Si<sub>3</sub> at 800 °C.

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Data on the early oxidation of SiO2-coated pure Ti and bulk Ti5Si3 at 800?°C.

Publications

Data on the early oxidation of SiO<sub>2</sub>-coated pure Ti and bulk Ti<sub>5</sub>Si<sub>3</sub> at 800 °C.

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OmicsDI is part of the ELIXIR infrastructure

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Data on the early oxidation of SiO₂-coated pure Ti and bulk Ti₅Si₃ at 800?°C.

Data on the early oxidation of SiO<sub>2</sub>-coated pure Ti and bulk Ti<sub>5</sub>Si<sub>3</sub> at 800 °C.