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Microstructure and hot corrosion resistance of Si-Al-Y coated TiAl alloy

TiAl 合金表面Si-Al-Y 渗层的组织及热腐蚀性能

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Abstract

In order to obtain a high-performance surface on TiAl alloy that can meet the requirements in hot corrosion environment, Si-Al-Y coatings were fabricated by pack cementation process at 1050 °C for 4 h. Corrosion behaviors of the TiAl alloy with and without Si-Al-Y coatings are compared to illustrate the factors and corresponding mechanism in molten salt environment of 25wt% K2SO4 and 75wt% Na2SO4 at 900 °C. The obtained Si-Al-Y coating was mainly composed of a TiSi2 outer layer, a (Ti, X)5Si4 and (Ti, X)5Si3 (X represents Nb or Cr element) middle layer, a TiAl2 inner layer and a Al-rich inter-diffusion zone. The inter-phase selective corrosion containing corrosion pits extending along α2 phase from lamellar interfaces in hot corrosion tested TiAl alloy was observed. However, by being coated with Si-Al-Y coating, the hot corrosion performance of TiAl alloy was improved remarkably.

摘要

为了提高TiAl 合金的抗热腐蚀性能, 采用1050 °C 下扩散共渗4 h 的方法在TiAl 合金表面制备 了Si-Al-Y 渗层。研究了TiAl 合金基体及渗层在900 °C 的25%K2SO4+75%Na2SO4 熔盐(质量分数)中 的热腐蚀行为, 探讨了其腐蚀速率和腐蚀机理。结果表明:Si-Al-Y 共渗层由外向内依次为 TiSi2 外层、 (Ti,X)5Si4 及(Ti,X)5Si3(X 表示Nb, Cr)中间层、TiAl2 和γ-TiAl 内层及富Al 的过渡层 。在K2SO4+Na2SO4 熔盐中, TiAl 合金沿着层片状的α2 相发生了选择性的腐蚀; 经过制备Si-Al-Y 渗层后, TiAl 合金的抗 热腐蚀性能得到了显著的提高。

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Authors and Affiliations

  1. School of Materials Science & Engineering, North Minzu University, Yinchuan, 750021, China

    Yong-quan Li  (李涌泉) & Shao-lin Yang  (杨少林)

  2. School of Aeronautics, Northwestern Polytechnical University, Xi’an, 710072, China

    Yong-quan Li  (李涌泉) & Fa-qin Xie  (谢发勤)

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  1. Yong-quan Li  (李涌泉)
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  2. Fa-qin Xie  (谢发勤)
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  3. Shao-lin Yang  (杨少林)
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Correspondence to Yong-quan Li  (李涌泉).

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Foundation item

Project(2020AAC02025) supported by the Natural Science Foundation of Ningxia Province, China; Project(51961003) supported by the National Natural Science Foundation of China; Project(TJGC2019040) supported by the Ningxia Youth Talents Supporting Program, China; Project(2020xyzc103) supported by the Foundation of North Minzu University, China

Contributors

The overarching research goals were developed by XIE Fa-qin and LI Yong-quan. The initial draft of the manuscript was written by LI Yong-quan. All authors replied to reviewers’ comments and revised the final version.

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LI Yong-quan, XIE Fa-qin and YANG Shao-lin declare that they have no conflict of interest.

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Li, Yq., Xie, Fq. & Yang, Sl. Microstructure and hot corrosion resistance of Si-Al-Y coated TiAl alloy. J. Cent. South Univ. 27, 2530–2537 (2020). https://doi.org/10.1007/s11771-020-4478-8

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