Study of the Thermal Stability and Mechanical Characteristics of MAX Phases of Ti-Al-C(N) System and their Solid Solutions

Abstract:

The DTA and TG study in air of Ti₂Al (C_1-xN_x) and Ti₃AlC₂ synthesized under Ar 0.1 MPa pressure and densified in thermobaric conditions at 2 GPa, 1400 °C, for 1 h showed that the increase of the amount of TiC layers in Ti-Al-C MAX phases structures leads to the increase of their stability against oxidation: 321 MAX phase Ti₃AlC₂ are more stable than Ti₂AlC and Ti₂Al (C_1-xN_x) solid solutions both before and after thermobaric treatment. The oxide film formed on the surface 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) made the material highly resistant in air at high temperatures: after 1000 hours of exposition at 600 °C it demonstrated a higher resistance to oxidation than chromium ferrite steels (Crofer GPU and JDA types). Due to the surface oxidation self-healing of defects took place. Besides, the Ti₃AlC₂ material demonstrated resistance against high-temperature creep and after being kept in H₂ at 600 °C for 3h its bending strength reduced by 5 % only. At room temperature the Ti₃AlC₂ bulk exhibited microhardness Hμ = 4.6 GPa (at 5 N), hardness HV₅₀ = 630 (at 50 N ) and HRA = 70 (at 600 N), Young modulus was 140 ± 29 GPa, bending strength =500 MPa, compression strength 700 MPa, and fracture toughness K_1C=10.2 MPa·m^0.5.

• Periodical: Advances in Science and Technology (Volume 89)
• Pages: 123-128
• DOI: https://doi.org/10.4028/www.scientific.net/AST.89.123
• Online since: October 2014
• Authors: Tatiana Prikhna*, Thierry Cabioc’h, Wolfgang Gawalek, Orest Ostash, Doris Litzkendorf, Sergey Dub, Matvey Loshak, Vladimir Sverdun, Patrick Chartier, Tetyana Basyuk, Victor Moshchil, Artem Kozyrev, Myroslav Karpets, Valeriy Kovylaev, Alexandra Starostina, Dmitriy Turkrvich
• Keywords: High Pressure, High-Temperature Resistance in Air, High-Temperature Resistance in Hydrogen, Hot Pressure, MAX Phase, Mechanical Characteristics, Oxide Film, Solid Solution, Ti₂Al(C_1-x,N_x), Ti₃AlC₂

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