Microstructure, Compressive Properties and Oxidation Behaviors of the Nb-Si-Ti-Cr-Al-Ta-Hf Alloy with Minor Holmium Addition

• Autorzy: Wang Qiaoli , Xiao Yinan , Wu Di , Yang Fang , Sheng L. Y.

Identyfikatory

DOI

10.24425/amm.2024.147807

• Języki publikacji: EN

Abstrakty

EN

In the present research, the Nb-Si-Ti-Cr-Al-Ta-Hf alloys with different Ho addition were prepared. Their microstructure, compressive properties and oxidation behaviors were investigated preliminarily. The results exhibit that the Nb-Si-Ti-Cr-Al-Ta-Hf alloy has coarse microstructure which is mainly composed of Nb solid solution, Nb₅Si₃ and Ti₅Si₃ phases. The minor Ho addition could refine the microstructure and suppress the precipitation of Ti₅Si₃ phase. Moreover, the Ho addition also leads to the formation of Ho₂Hf₂O₇, which prefers to precipitate along the Nbss/Nb₅Si₃ phase interface. Compared with the Nb-Si-Ti-Cr-Al-Ta-Hf alloy, the minor Ho addition improves the room-temperature and high-temperature compressive properties of the alloy. Its room-temperature compressive strength and ductility obtain the maximum value of 1825 MPa and 16.5% when the Ho content is 0.1 at.%. Moreover, its best compressive strength at 873 K, 1273 K and 1473 K is 1495 MPa, 765 MPa and 380 MPa, respectively, when the Ho addition is 0.1 at.%. The oxidation behavior of the Nb-Si-Ti-Cr-Al-Ta-Hf alloy is diversified with the Ho addition. The oxidation rate of the alloy with 0.1 at.% Ho addition is the lowest while the alloy with 0.2 at.% Ho addition is the highest. Therefore, the 0.1 at.% Ho would be the appropriate content for the Nb-Si-Ti-Cr-Al-Ta-Hf alloy.

Słowa kluczowe

EN

Nb alloy; Nb5Si3 phase; microstructure; mechanical properties; oxidation behavior

• Wydawca: Institute of Metallurgy and Materials Science of Polish Academy of Sciences ; Committee of Materials Engineering and Metallurgy of Polish Academy of Sciences
• Czasopismo: Archives of Metallurgy and Materials
• Rocznik: 2024
• Tom: Vol. 69, iss. 1
• Strony: 181--187
• Opis fizyczny: Bibliogr. 33 poz., fot., rys., tab.

Twórcy

autor

Wang Qiaoli

• Peking University, Shenzhen Institute, Shenzhen 518057, China
• PKU-HKUST Shenzhen-HongKong Institution, Shenzhen 518057, China

• https://orcid.org/0009-0001-5529-307X

autor

Xiao Yinan

• PKU-HKUST Shenzhen-HongKong Institution, Shenzhen 518057, China

• https://orcid.org/0000-0003-2454-5251

autor

Wu Di

• PKU-HKUST Shenzhen-HongKong Institution, Shenzhen 518057, China

• https://orcid.org/0009-0001-8605-1399

autor

Yang Fang

• Shenzhen Airlines, Shenzhen Bao’an International Airport, Shenzhen 518128, China

• https://orcid.org/0009-0008-5512-3776

autor

Sheng L. Y.

• Peking University, Shenzhen Institute, Shenzhen 518057, China
• PKU-HKUST Shenzhen-HongKong Institution, Shenzhen 518057, China

• https://orcid.org/0000-0001-7729-0315

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Uwagi

The authors gratefully acknowledge the support provided by the Guang-dong Basic and Applied Basic Research Foundation (2020A1515011301), Shenzhen Basic Research Project (JCYJ20210324120001003, JCYJ20200109144604020, and JCYJ20200109144608205) and the IER Foundation (IERF202102, IERF202201, and IERF202202).