Effect of minor Sc modification on the high-temperature oxidation behavior of near-α Ti alloy

Zhong, Xiuyang; Deng, Tongsheng; Xiao, Wenlong; Zhong, Ming; Lai, Yunhao; Ojo, O.A.

doi:10.1016/j.corsci.2023.111122

Cited by 18 publications

(2 citation statements)

References 58 publications

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“…It refined the microstructure and oxide, promoted the formation of the outermost layer Al 2 O 3 , improved the density of the oxide film, inhibited the segregation of W element, and finally improved the high-temperature oxidation resistance of α titanium alloy [49].…”

Section: Scmentioning

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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Section: Scmentioning

confidence: 99%

Research Status of Aluminum Base Coating on Titanium Alloy

Zeng,

2023

Coatings

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“…Y mainly affects the microstructures of titanium alloys by forming the Y 2 O 3 phase, thereby improving their strength and toughness [ 14 , 15 , 16 ]. Previous studies have pointed out that the addition of rare earth elements to a Ti-Al-Sn-Zr-Mo-Si series titanium alloy could refine the oxide particles and improve the oxidation resistance of the alloy [ 17 ]. Therefore, the addition of the Y element to the high-temperature titanium alloys may be an effective method to improve the heat resistance.…”

Section: Introductionmentioning

confidence: 99%

Effect of Y Content on Precipitation Behavior, Oxidation and Mechanical Properties of As-Cast High-Temperature Titanium Alloys

Shen

Wang³

et al. 2023

Materials

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To improve the heat resistance of titanium alloys, the effects of Y content on the precipitation behavior, oxidation resistance and high-temperature mechanical properties of as-cast Ti-5Al-2.75Sn-3Zr-1.5Mo-0.45Si-1W-2Nb-xY (x = 0.1, 0.2, 0.4) alloys were systematically investigated. The microstructures, phase evolution and oxidation scales were characterized by XRD, Laser Raman, XPS, SEM and TEM. The properties were studied by cyclic oxidation as well as room- and high-temperature tensile testing. The results show that the microstructures of the alloys are of the widmanstätten structure with typical basket weave features, and the prior β grain size and α lamellar spacing are refined with the increase of Y content. The precipitates in the alloys mainly include Y2O3 and (TiZr)6Si3 silicide phases. The Y2O3 phase has specific orientation relationships with the α-Ti phase: (002)Y2O3 // (1¯1¯20)α-Ti, [110]Y2O3 // [4¯401]α-Ti. (TiZr)6Si3 has an orientation relationship with the β-Ti phase: (022¯1¯)(TiZr)6Si3 // (011)β-Ti, [1¯21¯6](TiZr)6Si3 // [044¯]β-Ti. The 0.1 wt.% Y composition alloy has the best high-temperature oxidation resistance at different temperatures. The oxidation behaviors of the alloys follow the linear-parabolic law, and the oxidation products of the alloys are composed of rutile-TiO2, anatase-TiO2, Y2O3 and Al2O3. The room-temperature and 700 °C UTS of the alloys decreases first and then increases with the increase of Y content; the 0.1 wt.% Y composition alloy has the best room-temperature mechanical properties with a UTS of 1012 MPa and elongation of 1.0%. The 700 °C UTS and elongation of the alloy with 0.1 wt.% Y is 694 MPa and 9.8%, showing an optimal comprehensive performance. The UTS and elongation of the alloys at 750 °C increase first and then decrease with the increase of Y content. The optimal UTS and elongation of the alloy is 556 MPa and 10.1% obtained in 0.2 wt.% Y composition alloy. The cleavage and dimples fractures are the primary fracture mode for the room- and high-temperature tensile fracture, respectively.

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