High-temperature oxidation behaviour of TiAl alloys with Co addition

Yu, Peng; Lu, Xin; Hui, Tailong; Liu, Chengcheng; Liu, Bowen; Xu, Wei; Zhang, Ce; Sun, Jianzhuo; Qu, Xuanhui; Zhang, Jiazhen

doi:10.1007/s10853-020-05269-z

Cited by 28 publications

(3 citation statements)

References 45 publications

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“…Since the free energy of Al 2 O 3 formation is lower than that of TiO 2 , the Al on the surface of the material first reacted with atmospheric O to form an Al 2 O 3 oxide film. 24 The Al 2 O 3 then blocked the diffusion of O elements into the material and improved the high-temperature oxidation resistance. The EDS analysis of the product showed a significant increase in Al content compared to the matrix.…”

Section: Resultsmentioning

confidence: 99%

Oxidation performance of particle-reinforced Ti750 matrix composites

Tabie

Osman

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part L:

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This study used SiCp, SiCw, B4C, and GPLs as reinforcements for Ti750 matrix alloy and composites synthesized by spark plasma sintering. The oxidation performances of the composites were then evaluated at 800 °C. 5 vol.% SiCp reinforced Ti750 composite recorded the least oxidation weight gain of 3.80 mg.cm−2, about 41.8% of the base alloy. The average oxidation rates K + of the five materials at 800 °C were less than 1 g.m−2.h−1, indicating all materials were within the anti-oxidation grade with excellent anti-oxidation performance. The oxidation products of the samples contained TiO2, Al2O3, and SiO2. 5 vol.% SiCp reinforced Ti750 composite had significantly flatter and denser oxide film, which was well bonded with the matrix thus having a better protective effect than the matrix material. With the addition of SiCp, the thickness of the oxide film decreased, and the resistance of the material significantly improved its high-temperature oxidation performance.

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Section: Resultsmentioning

confidence: 99%

Oxidation performance of particle-reinforced Ti750 matrix composites

Tabie

Osman

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part L:

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“…According to the mapping results, it can be seen that the position shown in the yellow dotted area is the Co-rich phase, and this enrichment phase was identified as CoAl 2 Ti (FCC structure) by electron diffraction (Figure 5d). Pan et al [21] found that liquid + α → CoAl 2 Ti + Ti (HT), where Ti (HT) is the high-temperature solid solution phase of Ti, readily occurs when Co is added. Xia et al [22] found that CoAl 2 Ti tends to distribute at the grain boundary of γ-TiAl to form a network structure, similar to that observed in Figure 4d1.…”

Section: Microstructural Characterizationmentioning

confidence: 99%

Microstructure and Properties of TiAl Composite Coatings Prepared by Laser Cladding under Multi-Phase β0/CoAl2Ti Phase Strengthening

Zhu

Song

et al. 2022

Coatings

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Ceramic-reinforced TiAl matrix composite coatings are fabricated by laser cladding on Ti-6Al-4V (TC4) surfaces. The present work focuses on matching of the ceramic phase with the TiAl matrix to achieve a strength–toughness matching through the multi-scale multi-phase structure. The results indicated that the structure of composites coatings, including γ, α2, β0, CoAl2Ti, and TiC phases, significantly improved the properties of the composite coatings. The TiAl composite coating reached a maximum hardness of 741.17 Hv0.2, and the 10 at% tungsten carbide (10 WC) coating has the lowest wear volume of 8.8 × 107 μm3, the friction performance was approximate five times that of TC4. Detailed explanation of the friction properties and friction mechanism of the composite coating based on crystallographic orientation relationships and nanoindentation results. The study found that strength–toughness matching is important for the improvement of friction performance. Based on the TiAl alloy generated in the non-equilibrium solidification state in this paper, the solidification process and microstructure evolution are analyzed in detail.

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“…But its oxidation resistance decreases rapidly above 900 °C, which will not meet the performance requirements of practical applications and seriously restricts its wide application [5]. The competitive oxidation of Ti and Al in the TiAl alloy makes it difficult to form protective Al 2 O 3 , so the alloy matrix will be oxidised [6,7]. At present, there are many researches about this alloy's oxidation performance and mechanism [3,8,9].…”

Section: Introductionmentioning

confidence: 99%

Oxidation properties of Ti-47.5Al-2.5V-1.0Cr-0.2Zr alloy at 950–1050 °C

Lin

Huang

Yuan

et al. 2023

Materials Science and Technology

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Oxidation experiments of a Ti-47.5Al-2.5V-1.0Cr-0.2Zr alloy were carried out at 950, 1000 and 1050 °C. The alloy's oxidation kinetics curve, oxidation products, oxide film structure and oxidation mechanism at different oxidation temperatures and times were studied systematically. The oxide film has an obvious multilayer structure. Oxygen diffuses into the matrix alloy, and two oxides (TiO2 and Al2O3) grow alternately in layers to produce multilayer structures. As the oxidation process continues, oxygen atoms continue to diffuse in the matrix, there are holes and cracks in the oxide film, and the oxidation resistance of the oxide film is weakened.

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High-temperature oxidation behaviour of TiAl alloys with Co addition

Cited by 28 publications

References 45 publications

Oxidation performance of particle-reinforced Ti750 matrix composites

Oxidation performance of particle-reinforced Ti750 matrix composites

Microstructure and Properties of TiAl Composite Coatings Prepared by Laser Cladding under Multi-Phase β0/CoAl2Ti Phase Strengthening

Oxidation properties of Ti-47.5Al-2.5V-1.0Cr-0.2Zr alloy at 950–1050 °C

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