Microalloying effects of Ho on microstructure evolution and high temperature properties of Ti46Al4Nb1Mo alloy

Tan, Yingmei; Fang, Hongyuan; Chen, Ruirun; Liu, Yangli; Su, Yanqing; Guo, Jingjie; Cui, Hongzhi; Zhang, Shuyan; Fu, Hengzhi

doi:10.1016/j.intermet.2020.106883

Cited by 14 publications

(5 citation statements)

References 33 publications

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“…Though the Cr and al addition could help to form the oxidation resistance surface layer, however, the rapid inner oxidation could destroy the protective layer. actually, the active Re could induce the formation of specific oxide and help the oxidation resistance [27]. To study the effect of ho addition on the oxidation behavior of the nb-Si-Ti-Cr-al-Ta-hf alloy, the oxidation at 1373 K has been performed and mass variation of alloys is present in Fig.…”

Section: Oxidation Behaviormentioning

confidence: 99%

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

Wang,

Xiao,

et al. 2024

Archives of Metallurgy and Materials

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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.

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Section: Oxidation Behaviormentioning

confidence: 99%

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

Wang,

Xiao,

et al. 2024

Archives of Metallurgy and Materials

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“…The formed holmium oxide promoted the θ-Al 2 O 3 to α-Al 2 O 3 phase transition and inhibited the inward diffusion of oxygen, thus improving the oxidation resistance of Ti46Al4Nb1Mo alloy [48].…”

Section: Homentioning

confidence: 99%

Research Status of Aluminum Base Coating on Titanium Alloy

Zeng,

2023

Coatings

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At present, in the aviation industry, titanium alloy is mainly used to manufacture parts such as compressor discs, blades, and the casings of aircraft engines. When titanium alloys are in service, high temperature is generated due to high-speed running friction, which requires them to have high-temperature oxidation resistance and friction resistance. If they are used in an environment with salt corrosion, titanium alloys will face thermal corrosion, which limits their wider practical applications. At present, there are many methods to protect titanium alloys. This paper mainly includes alumina-based coatings and some preparation methods. The characteristics and functional mechanisms of three functional coatings for the service environment, namely highly temperature-resistant alumina-based coating, thermal corrosion-resistant alumina-based coating, and wear-resistant alumina-based coating, are summarized. Finally, the development direction of composite coatings of titanium and titanium alloys for a complex service environment is suggested.

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“…Rare-earth metals, such as Y, Sc, La, Ce, Nd, Gd, Ho, and Er, have seen some usage in γ-TiAl based alloys to improve the mechanical properties, the processability and the oxidation resistance. [288][289][290][291][292][293][294][295][296][297] Generally, these elements possess a limited solubility in the Ti-Al-related phases and, thus, often cause the precipitation of additional phases, predominantly aluminides [290][291][292] and oxides. [291][292][293][294][295][296] In particular, such precipitates have been found to refine the size of microstructural features.…”

Section: Rare-earth Metalsmentioning

confidence: 99%

“…[288][289][290][291][292][293][294][295][296][297] Generally, these elements possess a limited solubility in the Ti-Al-related phases and, thus, often cause the precipitation of additional phases, predominantly aluminides [290][291][292] and oxides. [291][292][293][294][295][296] In particular, such precipitates have been found to refine the size of microstructural features. However, compared to the alloying elements discussed previously, only a few studies are currently available in the literature regarding the influence of rare-earth metals on the phase transformations in γ-TiAl based alloys.…”

Section: Rare-earth Metalsmentioning

confidence: 99%

Alloying Elements in Intermetallic γ‐TiAl Based Alloys – A Review on Their Influence on Phase Equilibria and Phase Transformations

et al. 2023

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Intermetallic γ–TiAl based alloys are innovative structural materials dedicated to applications in the automotive and aeronautic industry. Especially their low density, high specific yield strength and excellent resistance against creep and oxidation make them a suitable choice for structural high‐temperature components in combustion engines. However, further improvement of their properties and processability is required to conquer new application areas and facilitate cost‐effective production. While the incorporation of additional alloying elements is a promising possibility, their effects on the phase transformations and phase equilibria need to be considered rigorously. In this context, this review provides a detailed survey of the research work on the influence of technically important alloying elements on the Ti–Al phase diagram. First, an introduction to the fundamentals of the phase transformations in γ‐TiAl based alloys and the consequences of changed cooling conditions, relevant for example to the latest developments within the field of processing, is given. Afterwards, the alloying elements, categorized with respect to their stabilization effect, are discussed and their particularities highlighted. Topics covered include established ternary phase diagrams and isoplethal sections, the stabilization of additional phases as well as the influence of alloying elements on the microstructure of modern engineering intermetallic γ‐TiAl based alloys.This article is protected by copyright. All rights reserved.

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Microalloying effects of Ho on microstructure evolution and high temperature properties of Ti46Al4Nb1Mo alloy

Cited by 14 publications

References 33 publications

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

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

Research Status of Aluminum Base Coating on Titanium Alloy

Alloying Elements in Intermetallic γ‐TiAl Based Alloys – A Review on Their Influence on Phase Equilibria and Phase Transformations

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