Liquidus projection for the Mo-rich portion of the Mo–Si–B ternary system

Nunes, Carlos Ângelo; Sakidja, Ridwan; Zhao, Dong; Perepezko, John H.

doi:10.1016/s0966-9795(99)00088-6

Cited by 112 publications

(84 citation statements)

References 6 publications

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“…5(b) and (c) indicate that the matrix is T 2 and the dispersions are Mo ss , which is in good agreement with the eutectic microstructures reported in the literature. 18,19) Therefore, the solidification steps of Alloy 1 were confirmed to be Mo ss (primary) ! Mo ss + T 2 eutectic !…”

Section: Resultsmentioning

confidence: 95%

“…The primary phase of Mo 2 B in Alloy 4 is also consistent with that in the liquidus projection. Phase Figure 7 shows the compositions of the two-phase eutectic and three phase areas for Alloys 1-4 determined by a quantitative EPMA analysis, and plotted against the overlapped liquidus projections reported by Yang and Chang 21) and Nunes et al 19) All four data points for the two-phase eutectic and the three-phase areas are plotted at the same point, irrespective of the primary phase. Note that the Mo ss -T 2 eutectic points are inside the Mo 2 B primary area in the liquidus projection by Yang and Chang.…”

Section: Resultsmentioning

confidence: 99%

“…17) Several efforts have been dedicated to understanding the phase formation, stability and solidification pathways of MoSi-B ternary alloys. 15,16,[18][19][20][21] Liquidus projection charts have played an important role in understanding the sequence of phase formation from liquidus phases to the final alloy product. A number of liquidus projections obtained experimentally and thermodynamically for the Mo-Si-B system have been reported.…”

Section: Introductionmentioning

confidence: 99%

“…A number of liquidus projections obtained experimentally and thermodynamically for the Mo-Si-B system have been reported. Nunes et al 18,19) were the first to show the solidification pathways for each primary phase region with their corresponding microstructures. Katrych et al also published the melting diagram of the Mo-Si-B system.…”

Section: Introductionmentioning

confidence: 99%

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Phase Formation and Solidification Routes Near Mo-Mo5SiB2 Eutectic Point in Mo-Si-B System

Yoshimi

Maruyama

et al. 2010

Mater. Trans.

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The phase formation behavior during solidification in the Mo-Si-B system was experimentally examined around the triple junction point (T) of the Mo solid solution (Mo ss ), Mo 5 SiB 2 (T 2 ) and Mo 2 B primary phases in the Mo-Si-B liquidus projection suggested by Yang and Chang through thermodynamic calculations, and the solidification routes of the Mo-Si-B alloys were reconsidered based on the obtained results. Alloys of four different compositions around the T point were produced by arc-melting. The primary phases observed in these alloys were in excellent agreement with the liquidus projection proposed by Yang and Chang. The solidification routes were basically Mo ss (primary) ! Mo ss + Mo 2 B ! Mo ss + T 2 eutectic ! Mo ss + T 2 + Mo 3 Si (A15), T 2 (primary) ! Mo ss + T 2 eutectic ! Mo ss + T 2 + A15, or Mo 2 B (primary) ! Mo ss + T 2 eutectic ! Mo ss + T 2 + A15, depending on the composition. However, a quantitative EPMA analysis indicated the compositions of the Mo ss -T 2 eutectic and Mo ss + T 2 + A15 phases differed from the reported liquidus projection. This is due to the difficulties interpreting the unusual solidification routes in the Mo-Si-B system and their as-cast microstructures.

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Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Phase Formation and Solidification Routes Near Mo-Mo5SiB2 Eutectic Point in Mo-Si-B System

Yoshimi

Maruyama

et al. 2010

Mater. Trans.

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“…Esta hipótese é pouco provável pois este mesmo tempo foi suficiente para promover a transição da fase Ta 3 Ge e também porque 500h é um tempo muito superior aos reportados de 2 minutos para síntese de germanetos (PARTHÉ; NORTON, 1958). (2) (NUNES et al, 2000;THOM;YOUNG;AKINC, 2000;NUNES et al, 2011). De acordo com a Tabela 12, as amostras confeccionadas apresentaram perdas de massa superiores às esperadas, mas este fato não invalida o estudo destas amostras visto que o objetivo desta etapa do trabalho é identificar a presença ou não da fase ternária φ no sistema Ta-Ge-B.…”

Section: Amostras Do Sistema Ta-geunclassified

Estudo experimental do sistema Ta-Ge e da região rica em Ta do ternário Ta-Ge-B

Silva¹

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Mo‐Si‐B Alloys for Ultrahigh‐Temperature Structural Applications

Lemberg¹,

Ritchie²

2012

Advanced Materials

245

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A continuing quest in science is the development of materials capable of operating structurally at ever-increasing temperatures. Indeed, the development of gas-turbine engines for aircraft/aerospace, which has had a seminal impact on our ability to travel, has been controlled by the availability of materials capable of withstanding the higher-temperature hostile environments encountered in these engines. Nickel-base superalloys, particularly as single crystals, represent a crowning achievement here as they can operate in the combustors at ~1100 °C, with hot spots of ~1200 °C. As this represents ~90% of their melting temperature, if higher-temperature engines are ever to be a reality, alternative materials must be utilized. One such class of materials is Mo-Si-B alloys; they have higher density but could operate several hundred degrees hotter. Here we describe the processing and structure versus mechanical properties of Mo-Si-B alloys and further document ways to optimize their nano/microstructures to achieve an appropriate balance of properties to realistically compete with Ni-alloys for elevated-temperature structural applications.

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Liquidus projection for the Mo-rich portion of the Mo–Si–B ternary system

Cited by 112 publications

References 6 publications

Phase Formation and Solidification Routes Near Mo-Mo<SUB>5</SUB>SiB<SUB>2</SUB> Eutectic Point in Mo-Si-B System

Phase Formation and Solidification Routes Near Mo-Mo<SUB>5</SUB>SiB<SUB>2</SUB> Eutectic Point in Mo-Si-B System

Estudo experimental do sistema Ta-Ge e da região rica em Ta do ternário Ta-Ge-B

Mo‐Si‐B Alloys for Ultrahigh‐Temperature Structural Applications

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