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High-throughput screening of Ta1-xHfxCy ceramics for mechanical and oxidation performance optimization for ultra-high-temperature applications
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DOI：10.26599/JAC.2026.9221252.png)
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Abstract
En 中文
Ta1-xHfxCy ternary ceramics are highly valued in hypersonic vehicles, and a precise composition design is promising to simultaneously reduce their intrinsic brittleness and enhance their protective capability during oxidation. Herein, the composition-dependent mechanical properties and oxidation behaviors of Ta1-xHfxCy ternary ceramics over a broad composition range (x = 0.22 to 0.78, y = 0.66 to 1.00) are efficiently investigated through combinatorial and high-throughput (CHT) experimentation to pave the way for targeted development of novel carbide candidates. Evolution trends in hardness and modulus reveal that the composition range with x = 0.22 to 0.60 and y = 0.80 to 1.00 is promising to reach an optimal balance between hardness and toughness, which results from competing effects between solid solution strengthening and bonding characteristic transition. High-throughput oxidation elucidates the phase constitution and compactness of oxidation products with various Ta/Hf distributions and temperatures. The accurate compositional range for the formation of a single-phase dense Hf-Ta-O compound layer shifts to a Ta-rich region (x = 0.50 to 0.60) due to the preferential formation of Ta-doped HfO2 and the structural characteristics of Hf-Ta-O compounds that accommodate compositional deviations. Regarding the broad compositional space of Ta1-xHfxCy, the effects of composition on both mechanical properties and oxidation behavior are systematically investigated, providing fundamental design guidelines and an optimal composition range that holds significant promise for application in subsequent research.
Keywords:
Ta1-xHfxCy ternary ceramics
combinatorial material chips
high-throughput screening
mechanical properties
oxidation resistance
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