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Thermal Stability and Mechanical Characteristics of Densified Ti3AlC2-Based Material

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Abstract:

The mechanical properties and temperature stability in air and hydrogen of the highly dense (ρ=4.27 g/cm3, porosity 1 %) material based on nanolaminated MAX phase Ti3AlC2 (89 % Ti3AlC2, 6 % TiC, 5 % Al2O3) manufactured by hot pressing (at 30 MPa) have been investigated. At room temperature the samples exhibited microhardness HV = 4.6 GPa (at 5 N), hardness HV50 = 630 MPa (at 50 N ) and HRA=70 (at 600 N), Young modulus was 140 ± 29 GPa, fracture toughness K1C=10.2 MPa·m0.5compression strength 700 MPa and bending strength 500 MPa. After 1000 hours of exposition at 600 °C the oxide film (containing mainly Al2O3 and TiO2) formed on the surface and material demonstrated a higher oxidation resistance than chromium ferrite steels. Due to the surface oxidation the defects self-healing took place and the bending strength of the porous Ti3AlC2 (22% porosity) after exposition for 3 h at 600 oC in air slightly (for 3%) increased as compared to that at 20 oC. Besides, the porous Ti3AlC2 material resisted to high-temperature creep and after being kept in H2 at 600 °C for 3h its bending strength reduced by 5 %.

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Periodical:

Solid State Phenomena (Volume 230)

Pages:

140-143

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.230.140

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Online since:

June 2015

Authors:

Tatiana Prikhna, Orest Ostash, Tetyana Basyuk, Andriy Ivasyshyn, Volodymyr Sverdun, Matvey Loshak, Sergey Dub, Viktoriya Podgurska, Viktor Moshchil, Thierry Cabioc’h, Patrick Chartier, Myroslav Karpets, Valeriy Kovylaev, Olexandra Starostina, Artem Kozyrev

Keywords:

High-Temperature Resistance in Air, Hot Pressure, Hydrogen, MAX Phase, Mechanical Characteristics, Oxide Film, Ti3AlC2, Vacuum Synthesis

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© 2015 Trans Tech Publications Ltd. All Rights Reserved

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References

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