2026-02-09 中国科学院（CAS）
＜関連情報＞
- https://english.cas.cn/newsroom/research_news/tech/202602/t20260210_1150278.shtml
- https://advanced.onlinelibrary.wiley.com/doi/10.1002/advs.202522526
格子歪み誘起拡散抑制による新規多主元素合金の1200℃における優れた耐酸化性 Outstanding 1200 °C Oxidation Resistance in a Novel Multi-Principal Element Alloy via Lattice Distortion-Induced Diffusion Suppression
Xinyu Zhang, Weiyan Lv, Xinguang Wang, Chuanmin Jia, Yizhou Zhou, Keqiang Qiu, Jianqiang Wang
Advanced Science Published: 06 February 2026
DOI:https://doi.org/10.1002/advs.202522526
ABSTRACT
The ongoing demand for high-thrust turbine engines necessitates the advance of next-generation structural materials capable of withstanding higher temperatures. Commercial MCrAlY alloy, used as bond coats crucial for thermal barrier coating (TBC) systems, face a fundamental temperature ceiling of ∼1100 °C due to accelerated oxidation and spallation. Here, we design a novel Y and Hf co-doped NiCoCrAl-type multi-principal element alloy (MPEA) that achieves exceptional 1200 °C oxidation resistance primarily through lattice distortion-induced diffusion suppression. Compared with typical NiCoCrAlY alloy, the MPEA exhibits 59% lower in thermally grown oxide (TGO) growth rate, as well as negligible TGO spallation after 500 h at 1200°C. This performance stems from a significantly refined eutectic structure enabling rapid formation of a protective Al2O3 scale during initial oxidation, coupled with lattice distortion that elevates vacancy formation energy and Al migration barriers within the Al-depletion zone (ADZ), drastically reducing sustained diffusion rates. This co-design strategy, integrating tailored microstructure and lattice distortion, establishes a new paradigm for ultra-stable performance in extreme environments.
