Microstructure evolution and sequence of phase transition reactions through the solidification of Mo-Si-B alloy; a phase-field study

Kazemi, Omid; Hasemann, Georg; Krüger, Manja; Halle, Thorsten

doi:10.1016/j.commatsci.2021.110422

Cited by 3 publications

(2 citation statements)

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“…The alloy was mainly composed of Mo ss -T2 binary eutectic and Mo ss -T2-Mo 3 Si ternary eutectic, whose solidification sequence can be expressed as Equation (14). Previously, to investigate the phase transition and solidification reactions of Mo-Si-B alloys, Kazemi utilized thermodynamic data from Factsage TM to conduct phase-field simulations with Micress TM, and confirmed the existence of binary and ternary eutectic reactions [7]. The alloy hardness increased with B content, reaching 1078.32 ± 59.9 HV at x = 15.…”

Section: Mo-12si-5b Mo-12si-85b Mo-12si-17bmentioning

confidence: 99%

“…If B is added to the alloy, the borosilicate glass scale will form in the initial oxidation stage, providing protection and effectively preventing oxidative degradation under medium temperature conditions [6]. According to a report by Shifler [7], the use of Mo-Si-B alloy in jet engines could lead to fuel savings ranging from 20% to 40%. Kauss performed stress-strain analyses on the turbine blades fabricated from Mo-17.5Si-8B and Mo-9Si-8B alloys, subjecting them to transient thermal-mechanical loads during startup and shutdown of the gas turbine via thermodynamic and structural-mechanical calculations [8].…”

Section: Introductionmentioning

confidence: 99%

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Review of Research Progress on Mo–Si–B Alloys

Yakang,

Wang,

Chen

et al. 2023

Materials

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Mo-Si-B alloys are a crucial focus for the development of the next generation of ultra-high-temperature structural materials. They have garnered significant attention over the past few decades due to their high melting point and superior strength and oxidation resistance compared to other refractory metal alloys. However, their low fracture toughness at room temperature and poor oxidation resistance at medium temperature are significant barriers limiting the processing and application of Mo-Si-B alloys. Therefore, this review was carried out to compare the effectiveness of doped metallic elements and second-phase particles in solving these problems in detail, in order to provide clear approaches to future research work on Mo-Si-B alloys. It was found that metal doping can enhance the properties of the alloys in several ways. However, their impact on oxidation resistance and fracture toughness at room temperature is limited. Apart from B-rich particles, which significantly improve the high-temperature oxidation resistance of the alloy, the doping of second-phase particles primarily enhances the mechanical properties of the alloys. Additionally, the application of additive manufacturing to Mo-Si-B alloys was discussed, with the observation of high crack density in the alloys prepared using this method. As a result, we suggest a future research direction and the preparation process of oscillatory sintering, which is expected to reduce the porosity of Mo-Si-B alloys, thereby addressing the noted issues.

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Section: Mo-12si-5b Mo-12si-85b Mo-12si-17bmentioning

confidence: 99%