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Oxidation mechanism of refractory high entropy alloys Ta-Mo-Cr-Ti-Al with varying Ta content
Corrosion Science ( IF 7.4 ) Pub Date : 2021-09-20 , DOI: 10.1016/j.corsci.2021.109861
S. Schellert 1 , B. Gorr 2 , S. Laube 2 , A. Kauffmann 2 , M. Heilmaier 2 , H.J. Christ 1
Affiliation  

The effect of Ta on the oxidation resistance of the alloys Tax-(Mo-Cr-Ti-Al)1−x (x=0; 5; 10; 15; 20 at%) in air at 1200 °C was examined. The oxidation behavior improves continuously with the increasing Ta concentration. Alloys with Ta concentrations Ta≤10 at% exhibit poor oxidation. Severe evaporation of MoO3 occurred which was quantitatively estimated. The evaporation of MoO3 is drastically reduced in alloys with the higher Ta concentrations. At 15 and 20 at% Ta, protective CrTaO4 scales are found. The CrTaO4 scale formed on Ta20-(Mo-Cr-Ti-Al)80 grows according to the parabolic rate law as a result of oxygen inward diffusion.



中文翻译:

不同Ta含量的难熔高熵合金Ta-Mo-Cr-Ti-Al的氧化机理

检验了 Ta 对合金 Ta x -(Mo-Cr-Ti-Al) 1-x (x=0; 5; 10; 15; 20 at%) 在 1200 °C 空气中的抗氧化性的影响。随着Ta浓度的增加,氧化行为不断改善。Ta 浓度 Ta≤10 at% 的合金表现出较差的氧化性。发生了定量估计的 MoO 3 的严重蒸发。在具有较高 Ta 浓度的合金中,MoO 3的蒸发急剧减少。在 15 和 20 at% Ta 时,发现了保护性 CrTaO 4鳞片。由于氧向内扩散,在Ta 20 -(Mo-Cr-Ti-Al) 80上形成的CrTaO 4鳞片根据抛物线速率定律生长。

更新日期:2021-10-02
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