Molybdenum silicide-based composites

Mitra, Rahul

doi:10.1016/b978-0-85709-346-2.00005-4

Cited by 3 publications

(6 citation statements)

References 175 publications

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“…For the investigation of the creep properties of Mo 3 Si, compression creep tests at 1093 • C and 1300 • C at varying stresses as well as at 300 MPa in the temperature range between 1050 and 1350 • C were performed. The results confirm the concept of the properties of the phases in Mo-Si-B alloys as described in the introduction and in [1][2][3]. It is found that Mo 3 Si possesses a higher creep response than Mo ss and Mo-Si-B alloys, but a lower creep response than single-phase Mo 5 SiB 2 .…”

Section: Discussionsupporting

confidence: 87%

“…The high solidus temperature of Mo-Si-B alloys makes them one of the most promising material classes for this approach. Detailed reviews on the properties of Mo-Si-B alloys and their phases are given in [1][2][3]. The best combination of properties was found in three-phase alloys consisting of Mo ss , Mo 3 Si, and Mo 5 SiB 2 .…”

Section: Introductionmentioning

confidence: 99%

“…The best combination of properties was found in three-phase alloys consisting of Mo ss , Mo 3 Si, and Mo 5 SiB 2 . Mo ss provides the ductility and both intermetallic phases are responsible for adequate creep and oxidation resistance under certain circumstances [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

“…The fracture toughness of polycrystalline Mo 3 Si and Mo 5 SiB 2 at room temperature is~3 MPa•m 1/2 [4,5]. The low plasticity of these phases is caused by low symmetry of the crystal structures of these phases, which inhibits plastic deformation through dislocation formation and motion [3]. Another reason for low fracture toughness of Mo 5 SiB 2 is anisotropy of the coefficient of thermal expansion along c-and a-axes, which encourages the development of internal residual stresses [3].…”

Section: Introductionmentioning

confidence: 99%

“…The low plasticity of these phases is caused by low symmetry of the crystal structures of these phases, which inhibits plastic deformation through dislocation formation and motion [3]. Another reason for low fracture toughness of Mo 5 SiB 2 is anisotropy of the coefficient of thermal expansion along c-and a-axes, which encourages the development of internal residual stresses [3]. However, the multi-phase Mo-Si-B alloys with volume fractions of ductile Mo ss ≥ 30% provide improved fracture toughness, because the plastic deformation of the ductile phase consumes significantly more energy, which leads to toughening by crack arrest and bridging.…”

Section: Introductionmentioning

confidence: 99%

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Temperature Resistance of Mo3Si: Phase Stability, Microhardness, and Creep Properties

Kauss

Obert

Bogomol

et al. 2021

Metals

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Mo-Si-B alloys are one of the most promising candidates to substitute Ni based superalloys in gas turbines. The optimization of their composition can be achieved more effectively using multi-scale modeling of materials behavior and structural analysis of components for understanding, predicting, and screening properties of new alloys. Nevertheless, this approach is dependent on data on the properties of the single phases in these alloys. The focus of this investigation is Mo3Si, one of the phases in typical Mo-Si-B alloys. The effect of 100 h annealing at 1600 °C on phase stability and microhardness of its three near-stoichiometric compositions—Mo-23Si, Mo-24Si and Mo-25Si (at %)—is reported. While Mo-23Si specimen consist only of Mo3Si before and after annealing, Mo-24Si and Mo-25Si comprise Mo5Si3 and Mo3Si before annealing. The latter is then increased by the annealing. No significant difference in microhardness was detected between the different compositions as well as after annealing. The creep properties of Mo3Si are described at 1093 °C and 1300 °C at varying stress levels as well as at 300 MPa and temperatures between 1050 °C and 1350 °C. Three constitutive models were used for regression of experimental results—(i) power law with a constant creep exponent, (ii) stress range dependent law, and (iii) power law with a temperature-dependent creep exponent. It is confirmed that Mo3Si has a higher creep resistance than Moss and multi-phase Mo-Si-B alloys, but a lower creep strength as compared to Mo5SiB2.

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Section: Discussionsupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%