Isothermal oxidation resistance, oxide scale evolution and failure mechanism of Ce-doped Co–Al–W–Mo–Ta–B alloy (0.01 at%, 0.05 at%, 0.10 at% and 0.20 at% Ce) exposed at 800 °C were compared. The 0.01Ce and 0.05Ce alloys were consisted of γ/γ′ coherent microstructure, while the κ-Co 3 W compound precipitated at the grain boundary of the 0.10Ce and 0.20Ce alloys in addition to the γ/γ′ microstructure. The oxidation kinetics curves of the Ce-doped alloys exhibited a parabolic time dependence on the weight gain. With an increasing nominal Ce content, the weight gain of the Co–Al–W–Mo–Ta–B alloys monotonically decreased. An oxide scale composed of a dense and uniform outer Co 3 O 4 + CoO layer, a middle CoAl 2 O 4 and CoWO 4 compound layer and an inner Al 2 O 3 layer. The excellent oxidation resistance of 0.2Ce alloy was mainly attributed to a shorter incubation stage for the formation of the continuous and protective Al 2 O 3 layer and the thickest Al 2 O 3 layer during entire oxidation process.

中文翻译：

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通过掺杂 Ce 提高 γ' 强化 Co-Al-W-Mo-Ta-B 合金在 800 °C 下的等温抗氧化性

Ce掺杂的 Co-Al-W-Mo-Ta-B 合金（0.01 at%、0.05 at%、0.10 at% 和 0.20 at% Ce）在 800 °C 下的等温氧化性、氧化皮演变和失效机制是比较的。0.01Ce和0.05Ce合金由γ/γ'相干显微组织组成，而κ-Co 3 W化合物除了γ/γ'显微组织外，还在0.10Ce和0.20Ce合金的晶界处析出。Ce掺杂合金的氧化动力学曲线表现出对重量增加的抛物线时间依赖性。随着标称 Ce 含量的增加，Co-Al-W-Mo-Ta-B 合金的重量增加单调下降。由致密且均匀的外Co 3 O 4 + CoO 层、中间CoAl 2 O 4 和CoWO 4 复合层和内Al 2 O 3 层组成的氧化皮。优异的抗氧化性 0.