Ultrahigh-temperature tensile creep of TiC-reinforced Mo-Si-B-based alloy

Kamata, Shiho Yamamoto; Kanekon, Daiki; Lu, Yonghao; Sekido, Nobuaki; Maruyama, Kouichi; Eggeler, Gunther; Yoshimi, Kyosuke

doi:10.1038/s41598-018-28379-w

Cited by 64 publications

(17 citation statements)

References 46 publications

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“…discovered the major advantage of adding TiC to Mo-Si-B alloys produced by casting 10,15 . The resultant alloys have densities reduced to less than 9 g/cm 3 , excellent high-temperature strength 16 , and good room-temperature toughness 17 . Their cast microstructures are basically composed of Mo solid solution (Mo ss ), D8 l -structured Mo 5 SiB 2 (T 2 ) and NaCl-type (Ti, Mo)C plus a small amount of MoC 0.5 -type orthorhombic (Mo, Ti) 2 C 18 depending on composition.…”

Section: Introductionmentioning

confidence: 99%

Study of solidification pathway of a MoSiBTiC alloy by optical thermal analysis and in-situ observation with electromagnetic levitation

Fukuyama

Sawada

Nakashima

et al. 2019

Sci Rep

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MoSiBTiC alloys are promising candidates for next-generation ultrahigh-temperature materials. However, the phase diagram of these alloys has been unknown. We have developed an ultrahigh-temperature thermal analyser based on blackbody radiation that can be used to analyse the melting and solidification of the alloy 67.5Mo–5Si–10B–8.75Ti–8.75 C (mol%). Furthermore, electromagnetic levitation (EML) was used for in-situ observation of solidification and microstructural study of the alloy. On the basis of the results, the following solidification pathway is proposed: Mo solid solution (Moss) begins to crystallize out as a primary phase at 1955 °C (2228 K) from a liquid state, which is followed by a (Moss+TiC) eutectic reaction starting at 1900 °C (2173 K). Molybdenum boride (Mo2B) phase precipitates from the liquid after the eutectic reaction; however, the Mo2B phase may react with the remaining liquid to form Moss and Mo5SiB2 (T2) as solidification proceeds. In addition, T2 also precipitates as a single phase from the liquid. The remaining liquid reaches the (Moss + T2 + TiC) ternary eutectic point at 1880 °C (2153 K), and the (Moss + T2 + Mo2C) eutectic reaction finally occurs at 1720 °C (1993 K). This completes the solidification of the MoSiBTiC alloy.

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Section: Introductionmentioning

confidence: 99%

Study of solidification pathway of a MoSiBTiC alloy by optical thermal analysis and in-situ observation with electromagnetic levitation

Fukuyama

Sawada

Nakashima

et al. 2019

Sci Rep

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“…To understand the features of the structure formation during crystallization, ternary system Mo-Si-B [52], in particular, in the region of the α-Mo-Mo 3 Si-Mo 5 SiB 2 [53] and Mo-Si-B-TiC quaternary diagram [54], was studied in detail. Because of the elevated melting temperature and the reactivity to ceramic materials when melting molybdenum alloys, the following technologies are used: vacuum electric arc melting with a non-consumable electrode on a copper tray cooled by water [55] and with inclined casting of workpieces [56], crystallization with directional solidification in an "optical floating zone" moving along the ingot height [57, industrial powder metallurgy technology and hot isostatic pressing [59], and also a new technology based on laser additive manufacturing [60]. Alloys of the following compositions are known in the literature: Mo-8.9Si-7.7B (at %) [59] and 65Mo-5Si-10B-10TiC (at %) [54][55][56].…”

Section: High-temperature Molybdenum-based Alloys Mo-si-bmentioning

confidence: 99%

Creation of High-Temperature Heat-Resistant Alloys Based on Refractory Matrices and Natural Composites

Bondarenko

Kolodyazhnyy

Surova

2021

Inorg. Mater. Appl. Res.

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In this paper, we consider the scientific, technical, and technological aspects in the field of creating new high-temperature materials for the parts of the hot section of gas turbine engines (GTEs) with operating temperatures exceeding those existing in GTEs. More refractory metallic materials for the creation of new high-melting alloys used in the manufacture of operating and nozzle blades and other parts of promising gas turbine engines based on the Co-Cr, Pt-Al, Nb-Si, and Mo-Si-B systems were studied. In alloys of the Co-Cr system, the high-temperature strength is mainly provided owing to the hardening of the Co matrix, including dispersed precipitates of the carbide phase (TaC) and the boride phase Cr 2 B. In alloys of the Pt-Al system, it is due to alloying with Cr, Al, Ti, Re, etc., and precipitates of the coherently embedded Pt 3 Al phase. In eutectic alloys of the Nb-Si system, it is due to the complex hardening of the Nb solid solution and the Nb 5 Si 3 silicide, as well as the natural compositional structure. In Mo-Si-B alloys, high strength is achieved by alloying with α-Mo solid solution and the formation of intermetallic phases Mo 3 Si and Mo 5 SiB 2 and carbides Mo 2 C and TiC. We selected compositions; analyzed smelting methods, including directional crystallization that provides a natural compositional structure; evaluated mechanical properties at room and high temperatures and oxidation resistance; studied structural features; and provided information on technological equipment and the possibility of obtaining parts by various methods. It is shown that, depending on the composition of the selected matrix, the operating temperature of heat-resistant alloys can increase to 1300-1500°C, which is significantly higher than the existing operating temperatures for nickel heat-resistant alloys. We conclude that the studied materials are promising for use in aircraft engine manufacture and the aerospace industry.

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“…Metallic alloys with superior mechanical and functional properties at elevated temperatures are in high demand in the aerospace industry 1,2 . Much attention has been paid to refractory intermetallic compounds in academic and industrial fields 3 . Mo-Si-B-based alloys are considered attractive candidates for use as structural materials in ultra-high-temperature applications 4,5 , owing to their high melting points and superior high-temperature strength [4][5][6][7][8][9][10][11][12][13][14] .…”

Section: Introductionmentioning

confidence: 99%

A Novel Approach of Fabricating Monodispersed Spherical MoSiBTiC Particles for Additive Manufacturing

Zhou

Guo

Zhou

et al. 2021

Preprint

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It is very challenging to fabricate spherical refractory material powders for additive manufacturing (AM) because of their high melting points and complex compositions. In this study, a novel technique, freeze-dry pulsated orifice ejection method (FD-POEM), was developed to fabricate spherical MoSiBTiC particles without a melting process. Elemental nanopowders were dispersed in water to prepare a high-concentration slurry, which was subsequently extruded from an orifice by diaphragm vibration and frozen instantly in liquid nitrogen. After a freeze-drying process, spherical composite particles with arbitrary composition ratios were obtained. The FD-POEM particles had a narrow size range and uniform elemental distribution. Mesh structures were formed within the FD-POEM particles, which was attributed to the sublimation of ice crystals. Furthermore, owing to their spherical morphology, the FD-POEM particles had a low avalanche angle of 42.6°, exhibiting good flowability. Consequently, the combination of FD-POEM and additive manufacturing has great potential for developing complex refractory components used in industrial applications.

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Ultrahigh-temperature tensile creep of TiC-reinforced Mo-Si-B-based alloy

Cited by 64 publications

References 46 publications

Study of solidification pathway of a MoSiBTiC alloy by optical thermal analysis and in-situ observation with electromagnetic levitation

Study of solidification pathway of a MoSiBTiC alloy by optical thermal analysis and in-situ observation with electromagnetic levitation

Creation of High-Temperature Heat-Resistant Alloys Based on Refractory Matrices and Natural Composites

A Novel Approach of Fabricating Monodispersed Spherical MoSiBTiC Particles for Additive Manufacturing

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