Ni3Al基高温合金的成分设计及室温性能

doi:10.13251/j.issn.0254-6051.2024.03.035

金属热处理 ›› 2024, Vol. 49 ›› Issue (3): 209-214.DOI: 10.13251/j.issn.0254-6051.2024.03.035

Ni₃Al基高温合金的成分设计及室温性能

滕宗延, 许雅南, 王轶农, 刘林, 徐朝晖

大连理工大学材料科学与工程学院, 辽宁大连 116024

收稿日期:2023-09-19 修回日期:2024-01-21 出版日期:2024-03-25 发布日期:2024-04-24
通讯作者: 王轶农,博士,教授,E-mail:wynmm@dlut.edu.cn
作者简介:滕宗延(1997—),男,硕士,主要研究方向为高温合金,E-mail:tengzongyan_i@163.com。
基金资助:
国家重点研发计划(2019YFA0705300)

Composition design and room temperature properties of Ni₃Al-based superalloys

Teng Zongyan, Xu Yanan, Wang Yinong, Liu Lin, Xu Zhaohui

School of Materials Science and Engineering, Dalian University of Technology, Dalian Liaoning 116024, China

Received:2023-09-19 Revised:2024-01-21 Online:2024-03-25 Published:2024-04-24

摘要/Abstract

摘要： 为改善Ni₃Al基高温合金的室温性能,基于“团簇加连接原子模型”对Ni₃Al基合金进行了成分设计,考察了合金的显微组织、力学性能和耐蚀性。结果表明,退火前后合金均由β相、α相和基体γ'相组成。1050 ℃×24 h退火后Ni₅Co₅Cr₂Al_2.5Ti_1.5合金中β相和α相在基体中分布均匀,不仅使其呈现出更优的力学性能(最大压缩率为29.35%,屈服强度为1796 MPa,硬度为546.35 HV),还诱导合金发生电偶腐蚀,增强了合金的钝化效果,使合金呈现出更好的耐蚀性(阻抗为7.74×10⁴ Ω,自腐蚀电位为-0.055 V(vs SCE),自腐蚀电流密度为5.93×10^-7 A/cm²)。本文所设计合金的室温力学性能和耐蚀性与Ni₃Al相比均有显著改善,为高温合金的成分设计提供了新的研究思路。

关键词: Ni₃Al基合金, 团簇加连接原子模型, 退火处理, 显微组织

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

中图分类号:

滕宗延, 许雅南, 王轶农, 刘林, 徐朝晖. Ni₃Al基高温合金的成分设计及室温性能[J]. 金属热处理, 2024, 49(3): 209-214.

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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Ni₃Al基高温合金的成分设计及室温性能

Composition design and room temperature properties of Ni₃Al-based superalloys

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