Microstructure and oxidation mechanism of multiphase Mo–Ti–Si–B alloys at 800 °C

Zhao, Mi; Xu, Boyang; Shao, Yuman; Zhu, Yansong; Wu, Jie; Wu, Shusen; Yan, Yunjun

doi:10.1016/j.corsci.2021.109518

Cited by 21 publications

(12 citation statements)

References 45 publications

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“…The situation slightly changed after high-temperature an ing (1600 °C for 24 h). Figure 8 [48] presents the microstructures of the annealed allo It should be noted that the T1 phase vanished in the Mo-20Ti-20Si-10B alloy apparent microstructure coarsening took place in the eutectic structure for all al Figure 8d, which summarizes the volume fractions of constituent phases in these al expresses an overall trend that the volume fractions of the BCC phase and D88 phas crease with increasing Ti concentration whereas that of the A15 phase has the opp tendency. This result brings us the good news that even for the complex quaternary tem, the phase constitution and volume fraction of each phase can be easily tailore It should be noted that the T 1 phase vanished in the Mo-20Ti-20Si-10B alloy and apparent microstructure coarsening took place in the eutectic structure for all alloys.…”

Section: Experimental Characterizationmentioning

confidence: 95%

“…Except for the formation of the T 2 phase, microstructure evolution in the Mo-Ti-Si-B quaternary alloys with increasing Ti content does not seem to make much difference compared with that of Mo-Ti-Si alloys. Zhao et al [48] designed and investigated three kinds of cast Mo-Ti-Si-B alloys, i.e., Mo-20Ti-20Si-10B, Mo-30Ti-20Si-10B and Mo-40Ti-20Si-10B (at.%). These alloys contained the same Si and the same B contents while having a trade-off between Mo and Ti.…”

Section: Experimental Characterizationmentioning

confidence: 99%

“…The situation slightly changed after high-temperature annealing (1600 • C for 24 h). Figure 8 [48] presents the microstructures of the annealed alloys.…”

Section: Experimental Characterizationmentioning

confidence: 99%

“…The cooling process leads to the ani shrinkage of this phase, and gives rise to microcracking perpendicular to its a-axi that the D88-Ti5Si3 compound in the Mo-Ti-Si-B system is always off-stoichiome a considerable amount of Mo dissolved. Upon annealing, Mo-rich BCC parti precipitate within the primary D88 grains by the diffusion of supersaturated M [35,48,52,53]. The BCC precipitates (see Figure 9 [53]) are promising for enhan toughness of the alloy by inhibiting the propagation of microcracks within the trix.…”

Section: Experimental Characterizationmentioning

confidence: 99%

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From Mo–Si–B to Mo–Ti–Si–B Alloys: A Short Review

Zhao

Zhu

et al. 2022

Materials

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Mo–Si–B alloys have attracted considerable research interest during the last several decades due to their high melting points, excellent high-temperature strength and relatively good oxidation resistance. However, insufficient room-temperature fracture toughness and high-temperature oxidation resistance restrain their further application. Generally, a sufficient volume fraction of BCC-Mo solid-solution phase, providing the ductility, and a high Si content, responsible for the formation of passive oxide scales, is difficult to achieve simultaneously in this ternary system. Recently, macroalloying of Ti has been proposed to establish a novel phase equilibrium with a combination of enough BCC phase and intermetallic compounds that contain a large amount of Si. In this article, the development history from the ternary Mo–Si–B to the quaternary Mo–Ti–Si–B system was reviewed. It was found that the constitution phases could be easily tailored by changing the Ti content. In this regard, better performance of mechanical properties and oxidation resistance can be obtained through proper alloy design. In-depth understanding of the advantages of the quaternary alloys over their ternary ancestors may contribute to bringing about a new concept in designing novel ultra-high-temperature structural materials.

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Section: Experimental Characterizationmentioning

confidence: 95%

Section: Experimental Characterizationmentioning

confidence: 99%

“…The situation slightly changed after high-temperature annealing (1600 • C for 24 h). Figure 8 [48] presents the microstructures of the annealed alloys.…”

Section: Experimental Characterizationmentioning

confidence: 99%

Section: Experimental Characterizationmentioning

confidence: 99%

See 2 more Smart Citations

From Mo–Si–B to Mo–Ti–Si–B Alloys: A Short Review

Zhao

Zhu

et al. 2022

Materials

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“…Mo-Ti-Si-B alloys are considered as a promising ultra-high temperature material. However, their oxidation resistance and mechanical properties need to be further studied [24]. In contrast, the surface-coating technology can improve the oxidation resistance of the alloy at high temperature with as little impact on the mechanical properties as possible.…”

Section: Introductionmentioning

confidence: 99%

Oxidation Protection of High-Temperature Coatings on the Surface of Mo-Based Alloys—A Review

Shen

Zhang

et al. 2022

Coatings

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Molybdenum and its alloys, with high melting points, excellent corrosion resistance and high temperature creep resistance, are a vital high-temperature structural material. However, the poor oxidation resistance at high temperatures is a major barrier to their application. This work provides a summary of surface modification techniques for Mo and its alloys under high-temperature aerobic conditions of nearly half a century, including slurry sintering technology, plasma spraying technology, chemical vapor deposition technology, and liquid phase deposition technology. The microstructure and oxidation behavior of various coatings were analyzed. The advantages and disadvantages of various processes were compared, and the key measures to improve oxidation resistance of coatings were also outlined. The future research direction in this field is set out.

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Effect of Microstructure on Oxidation and Micro-mechanical Behavior of Arc Consolidated Mo-Ti-Si-(B) Alloys

Paul,

Kumar,

Kishor

et al. 2024

J. of Materi Eng and Perform

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The present study deals with the development and characterization of Mo-35Ti-10Si and Mo-35Ti-10Si-2B (wt.%) alloy for ultra-high temperature applications beyond the temperature limit of existing super alloys. The microstructural characterization using scanning electron microscopy (SEM), energy dispersive spectrometry (EDS), electron back scattered diffraction (EBSD), x-ray diffraction (XRD) revealed that the Mo-35Ti-10Si-2B alloy was consisted of three phases, namely, (Mo, Ti)ss, (Mo, Ti)5SiB2 and (Ti, Mo)5Si3; whereas, Mo-35Ti-10Si alloy was found to be consisting of (Mo, Ti)ss, and (Mo,Ti)3Si phases. Since quantification of boron is difficult by EDS, Particle Induced Gamma-ray Emission (PIGE), a nuclear reaction analysis technique was used for chemical composition analysis of boron. The oxidation behavior of the Mo-35Ti-10Si-2B alloy in the temperature regime of 825-1250 °C was studied in detail and compared with boron-free Mo-35Ti-10Si alloy. Mo-35Ti-10Si-2B alloy exhibited superior oxidation behavior at intermediate temperatures of 825 °C, and excellent oxidation resistance at higher temperatures between 1000 and 1250 °C due to the formation of the protective borosilica and double oxide layers (TiO2 and duplex borosilica-TiO2), respectively. High-temperature oxidation mechanisms were discussed using detailed microstructural cross section analysis of the oxidized alloy samples. The micro-mechanical behavior of constitutive phases of the Mo-35Ti-10Si-2B alloy were studied by microhardness, nano-indentation and micropillar compression testing. The micropillar compression of (Mo, Ti)ss phase showed fairly ductile behavior with the evidence of activation of dislocation in the form of slip lines revealed through the post-deformation fractography. Deformation studies of (Mo, Ti)5SiB2 and (Ti, Mo)5Si3 phases were also carried out which showed large strain bursts indicating possibility of activation of dislocation activities even at room temperatures imparting low level of ductility.

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Microstructure and oxidation mechanism of multiphase Mo–Ti–Si–B alloys at 800 °C

Cited by 21 publications

References 45 publications

From Mo–Si–B to Mo–Ti–Si–B Alloys: A Short Review

From Mo–Si–B to Mo–Ti–Si–B Alloys: A Short Review

Oxidation Protection of High-Temperature Coatings on the Surface of Mo-Based Alloys—A Review

Effect of Microstructure on Oxidation and Micro-mechanical Behavior of Arc Consolidated Mo-Ti-Si-(B) Alloys

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