Development of Co–Ni–Al–V–Ta–Cr-based superalloys with high-temperature strength and excellent oxidation resistance

作者：Cuiping Wang, Youheng Chen, Haojun Zhuo, Wensu Cai, Yuechao Chen, Xiang Yu, Shuiyuan Yang, Yingju Li, Yuansheng Yang, Xingjun Liu · 发表于：Journal of Materials Research and Technology · 年份：2023 · DOI：10.1016/j.jmrt.2023.11.217 · 被引用次数：15 · 研究领域：High Temperature Alloys and Creep、High-Temperature Coating Behaviors、Intermetallics and Advanced Alloy Properties

In this study, the effects of V on the microstructure, lattice misfit, solvus temperatures, and oxidation behaviors of the Co–Ni–Al–V–Ta-based superalloys are investigated. The results show that all these alloys exhibit the γ’/γ two-phase structures. More importantly, the γ’ solvus temperature increases, and the oxidation resistance is significantly improved with the reduction of V concentration. Subsequently, the Ti (2 at.%) was added into Co–40Ni–10Al–4Ta–1V–12Cr alloy to further raise the properties of the superalloy. It is found that the Co–40Ni–10Al–4Ta–1V–12Cr–2Ti alloy exhibits a higher solvus temperature reaching 1200 °C of the γ′ phase, a low density of 8.48 g/cm3, a low lattice misfit of only +0.37 %, as well as exceptional oxidation resistance and mechanical properties.