Near-Eutectic Ternary Mo-Si-B Alloys: Microstructures and Creep Properties

Hasemann, Georg; Kaplunenko, D; Bogomol, I.; Krüger, Manja

doi:10.1007/s11837-016-2073-0

Cited by 28 publications

(25 citation statements)

References 25 publications

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“…This further supports a possibly dominant contribution of Ti 5 Si 3 to the creep deformation in the eutectic alloy. Compared to that, Mo-Si-B alloys show stress exponents in the range of 3 to 7 [16,33,34,35,36] at 1200 °C.…”

Section: Creep Behaviormentioning

confidence: 85%

“…Another approach is to utilize a eutectic reaction or eutectoid decomposition to obtain fine, lamellar microstructures [14]. Like in the case of TiAlbased alloys [15], some investigations on ternary eutectic Mo-Si-B alloys yield both, improved creep resistance and better oxidation resistance [15,16]. However, the improvement of creep resistance may also be attributed to the relatively high amount of intermetallic phases present in these ternary alloys, which may likewise be beneficial for the oxidation resistance, too.…”

Section: Introductionmentioning

confidence: 99%

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Constitution, oxidation and creep of eutectic and eutectoid Mo-Si-Ti alloys

et al. 2019

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In the present contribution, we describe the successful development of two ternary Mo-Si-Ti alloys with two-phase eutectic and eutectoid microstructure, respectively. In the case of Mo-20.0Si-52.8Ti (at.%), a fully eutectic microstructure consisting of body-centered cubic (bcc) solid solution (Mo,Ti,Si) and hexagonal (Ti,Mo) 5 Si 3 can be obtained in very good agreement with thermodynamic calculations. A fully eutectoid decomposed microstructure is observed subsequent to heat-treatment at 1300 °C for 200 h in the case of Mo-21Si-34Ti (at.%). For this alloy, bcc (Mo,Ti,Si) and tetragonal (Mo,Ti) 5 Si 3 appears after decomposition from the A15-type (Mo,Ti) 3 Si. Besides that, a small amount of hexagonal (Ti,Mo) 5 Si 3 forms in the silicide lamellae, too, which is attributed to Ti segregations in the as-cast microstructure. In addition to the focus on microstructure, both oxidation and creep behavior were preliminarily investigated and compared to other state-of-the-art Mo-based alloys. In the case of the eutectic alloy, a promising and unexpected oxidation resistance at 800 °C is observed whereas the eutectoid alloy exhibits catastrophic oxidation; a behavior that is typically observed under these conditions in alloys containing Mo-rich solid solution. The eutectic alloy shows an approximately one order of magnitude higher creep rate within the investigated temperature and stress range as compared to the eutectoid decomposed counterpart. This is attributed to the rather low intrinsic creep resistance of the hexagonal (Ti,Mo) 5 Si 3 and generally lower melting point of the former alloy, whereas in the latter case, creep seems to be controlled by the deformation of the bcc solid solution (Mo,Ti,Si) and the tetragonal (Mo,Ti) 5 Si 3 .

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Section: Creep Behaviormentioning

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Constitution, oxidation and creep of eutectic and eutectoid Mo-Si-Ti alloys

et al. 2019

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“… 59 Mo-17.5Si-8B CC 1093–1400 3.4–4.4 391 2016 Hasemann et al . 60 Mo-17.5B-10B CC 1093–1400 3–4.5 318 1979 Maier et al . 32 Mo TD 1087–2500 - 460 …”

Section: Discussionmentioning

confidence: 99%

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

Kamata

Kanekon

et al. 2018

Sci Rep

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In this study, the ultrahigh-temperature tensile creep behaviour of a TiC-reinforced Mo-Si-B-based alloy was investigated in the temperature range of 1400–1600 °C at constant true stress. The tests were performed in a stress range of 100–300 MPa for 400 h under vacuum, and creep rupture data were rationalized with Larson-Miller and Monkman-Grant plots. Interestingly, the MoSiBTiC alloy displayed excellent creep strength with relatively reasonable creep parameters in the ultrahigh-temperature range: a rupture time of ~400 h at 1400 °C under 137 MPa with a stress exponent (n) of 3 and an apparent activation energy of creep (Qapp) of 550 kJ/mol. The increasing rupture strains with decreasing stresses (up to 70%) and moderate strain-rate oscillations in the creep curves suggest that two mechanisms contribute to the creep: phase boundary sliding between the hard T2 and (Ti,Mo)C phases and the Moss phase, and dynamic recovery and recrystallization in Moss, observed with orientation imaging scanning electron microscopy. The results presented here represent the first full analysis of creep for the MoSiBTiC alloy in an ultrahigh-temperature range. They indicate that the high-temperature mechanical properties of this material under vacuum are promising.

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“…Therefore, a lot of research is focused on the alloying of Mo-Si-B to find compositions that combine high oxidation resistance and favorable mechanical properties. [17][18][19][20] However, the desired material properties require different microstructures according to Figure 3.…”

Section: Mo Pestingmentioning

confidence: 99%

Oxidation‐Resistant Environmental Barrier Coatings for Mo‐Based Alloys: A Review

et al. 2020

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Molybdenum‐based materials offer high melting temperatures and promising mechanical properties; therefore, they are potential candidates for high‐temperature components, such as turbine blades. However, at temperatures above 700 °C, molybdenum suffers from severe pesting phenomenon, leading to decomposition of the component. Therefore, oxidation‐resistant environmental barrier coatings are crucial to prevent the material from degradation and to maintain its excellent mechanical properties at high temperatures. This review provides a detailed overview on the different coating concepts for Mo and Mo‐based alloys.

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Near-Eutectic Ternary Mo-Si-B Alloys: Microstructures and Creep Properties

Cited by 28 publications

References 25 publications

Constitution, oxidation and creep of eutectic and eutectoid Mo-Si-Ti alloys

Constitution, oxidation and creep of eutectic and eutectoid Mo-Si-Ti alloys

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

Oxidation‐Resistant Environmental Barrier Coatings for Mo‐Based Alloys: A Review

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