Recent advances in silicon containing high temperature titanium alloys

Zhao, Ertuan; Sun, Shichen; Zhang, Yu

doi:10.1016/j.jmrt.2021.08.117

Cited by 84 publications

(13 citation statements)

References 37 publications

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“…2 has a β transformed structure, and the phase boundaries are obviously increased, which can well inhibit the movement of the dislocations. At the same time, Si is mainly found in the β phase in a solid solution state, which strengthens the β phase [16,17]. Therefore, No.…”

Section: Creep Mechanismmentioning

confidence: 95%

Compressive creep behavior of Ti-6Al-4V-xSi-ySc alloys under high-pressure at room temperature

Deng

Cao²,

Yang³

et al. 2022

Mater. Res. Express

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One of the characteristics of Titanium alloys is that they are prone to creep due to the service conditions under high-pressure, such as deep-sea equipment. The compressive properties and deformation mechanism of Ti-6Al-4V-xSi-ySc alloys at room temperature are investigated in this study. The alloy samples are subjected to uniaxial compressive and creep tests. The obtained compression creep properties at room temperature follow the power-law function, and creep is mainly found in the first and second stage. Si and Sc are observed to improve the creep properties where the latter shows significant effect. This can be attributed to the strengthening of the solid solution of Si and Sc. Sc and Si strengthen the α and β phases respectively. The stability of these phases contributes to increasing the creep resistance of Titanium alloys. The creep resistance mechanisms of the alloys involve dislocation movement and twins.

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Section: Creep Mechanismmentioning

confidence: 95%

Compressive creep behavior of Ti-6Al-4V-xSi-ySc alloys under high-pressure at room temperature

Deng

Cao²,

Yang³

et al. 2022

Mater. Res. Express

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show abstract

“…It was not until the 1970s, when Seagle R, et al [110] first found that the addition of Si had a unique effect on the high-temperature creep resistance of Ti-6242 (Ti-6Al-2Sn-4Zr-2Mo) alloy, that the importance of Si received widespread attention. In a study of Ti-Si binary alloy, or multicomponent titanium alloy [127], the researchers found that the creep deformation and steady-state creep rate of alloy containing Si are always much lower than that of alloy without Si. At present, almost all high-temperature titanium alloys used in environments above 500 • C are combined with 0.1-0.5 wt.% Si, such as Ti-6242S (Ti-6Al-2Sn-4Zr-2Mo-0.1Si), IMI834, Ti1100, and Ti60.…”

Section: Eutectoid β Stable Elementmentioning

confidence: 99%

Research Progress on the Creep Resistance of High-Temperature Titanium Alloys: A Review

Liu,

Xin,

Zhao

2023

Metals

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High-temperature titanium alloys are one of the most important research directions in the field of high-temperature aerospace alloys. They are mainly used in high-temperature-resistant components, such as blade disks, blades, and casings of aero-engines, and are key materials in a new generation of high thrust-to-weight ratio aero-engines. In the service environment of engineering applications, the creep resistance of high-temperature titanium alloys is one of the most important characteristic indicators. This paper reviews and analyzes the research status and progress on the creep properties of typical high-temperature titanium alloys in service in recent years. The effects of the creep parameters, alloy composition, and microstructure on the creep behavior of high-temperature titanium alloys are discussed, and various possible mechanisms for increasing the creep resistance of high-temperature titanium alloys are summarized.

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“…Titanium alloys are extensively utilized in fields such as aero-engines and shipbuilding due to their high specific strength, high specific stiffness, and excellent corrosion resistance [4]. However, titanium alloys still face significant challenges at higher temperatures [5]. To address this issue, researchers have employed various surface modification techniques such as thermal spraying [6], laser cladding [7], and pack cementation [8] to create coatings on titanium alloy surfaces, achieving significant advancements.…”

Section: Introductionmentioning

confidence: 99%

Formation Mechanism of Ti–Si Multi-Layer Coatings on the Surface of Ti–6Al–4V Alloy

Zhao,

Liang,

Zhang

et al. 2024

Coatings

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Titanium alloys are widely used in aerospace applications due to their high specific strength and exceptional corrosion resistance. In this study, a silicide coating with a multi-layer structure was designed and prepared via a pack cementation process to improve the high-temperature oxidation resistance of titanium alloy. A new theory based on the Le Chatelier’s principle is proposed to explain the generation mechanism of active Si atoms. Taking the chemical potential as a bridge, a functional model of the relationship between the diffusion driving force and the change in the Gibbs free energy of reaction diffusion is established. Experimental results indicate that the depth of the silicide coating increases with the siliconization temperature (1000–1100 °C) and time (0–5 h). The multi-layer coating prepared at 1075 °C for 3 h exhibits a thick and dense structure with a thickness of 23.52 μm. This coating consists of an outer layer of TiSi2 (9.40 μm), a middle layer of TiSi (3.36 μm), and an inner layer of Ti5Si3 (10.76 μm). Under this preparation parameter, increasing the temperature or prolonging the holding time will cause the outward diffusion flux of atoms in the substrate to be much larger than the diffusion flux of silicon atoms to the substrate, thus forming pores in the coating. The calculated value of the diffusion driving force FTiSi = 2.012S is significantly smaller than that of FTiSi2 = 13.120S and FTi5Si3 = 14.552S, which perfectly reveals the relationship between the thickness of each layer in the Ti–Si multi-layer coating.

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Recent advances in silicon containing high temperature titanium alloys

Cited by 84 publications

References 37 publications

Compressive creep behavior of Ti-6Al-4V-xSi-ySc alloys under high-pressure at room temperature

Compressive creep behavior of Ti-6Al-4V-xSi-ySc alloys under high-pressure at room temperature

Research Progress on the Creep Resistance of High-Temperature Titanium Alloys: A Review

Formation Mechanism of Ti–Si Multi-Layer Coatings on the Surface of Ti–6Al–4V Alloy

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