Composition design and room temperature properties of Ni3Al-based superalloys

doi:10.13251/j.issn.0254-6051.2024.03.035

Abstract

Abstract: Chemical composition of Ni₃Al-based alloy was designed based on the “Cluster-plus-glue-atom model” to improve its room temperature properties, the microstructure, mechanical properties and corrosion resistance of the alloys were investigated. The results show that the alloys before and after annealing are composed of β phase, α phase and matrix phase γ'. After annealing at 1050 ℃ for 24 h, β phase and α phase are evenly distributed in the matrix of Ni₅Co₅Cr₂Al_2.5Ti_1.5 alloy, which improves not only the mechanical properties (maximum compression rate of 29.35%, yield strength of 1796 MPa, hardness of 546.35 HV), but also induces galvanic corrosion, enhances the passivation effect and improves the corrosion resistance (impedance of 7.74×10⁴ Ω, corrosion potential of -0.055 V(vs SCE), corrosion current density of 5.93×10^-7 A/cm²) of the alloys. The alloys designed in this paper show significant improvements in mechanical properties and corrosion resistance compared to Ni₃Al. This work provides a new avenue for research in the composition design of high-temperature alloys.

Key words: Ni₃Al-based alloy, cluster-plus-glue-atom model, annealing treatment, microstructure

CLC Number:

Teng Zongyan, Xu Yanan, Wang Yinong, Liu Lin, Xu Zhaohui. Composition design and room temperature properties of Ni₃Al-based superalloys[J]. Heat Treatment of Metals, 2024, 49(3): 209-214.

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Composition design and room temperature properties of Ni₃Al-based superalloys

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