Work

Synergistic effects of Al and Mo on coarsening kinetics of Ni-based superalloys at 1200°C

Year: 2024

Type: article

Abstract: The interaction effects of γ-strengthening and γ'-former elements have long troubled the alloying design of superalloys, especially improving γ'-thermostability by Al addition against higher temperatures. Here we establish a thermodynamics-based phase-field model to reveal the γ'-coarsening kinetics at 1200°C for well-designed ternary Ni-based superalloys containing γ'-former element Al and γ-strengthening element Mo. The inhibition effect of Al on coarsening is interestingly enhanced by Mo addition to signify their synergistic effects. The contributions of lattice misfit, diffusion coefficients and elemental partitioning are analysed by decoupling coarsening theories. And an estimation method of the coarsening rate controlled by slow-diffusing element is also established.

Source: Materials Research Letters

DOI: 10.1080/21663831.2024.2425772

Authors: Mingzhe Li, Wenyue Zhao, Yi Ru, Yanling Pei, Shusuo Li, Shengkai Gong

Institutions: Beihang University, Tianmushan Laboratory, Aero Engine Corporation of China (China)

Language: English

Topic: High Temperature Alloys and Creep

Subfield: Mechanical Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $1,459

Funders: Beijing Nova Program, Key Research and Development Program of Zhejiang Province