Room temperature fracture toughness and high temperature strength of T2/Moss and (Mo,Nb)ss/T1/T2 eutectic alloys in the Mo–Si–B system

Ito, Kazuhiro; Kumagai, Michiaki; Hayashi, Teruaki; Yamaguchi, M.

doi:10.1016/s1359-6462(03)00289-6

Cited by 57 publications

(21 citation statements)

References 15 publications

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“…The oxidation behavior and the densitynormalized strength of these materials are compared in Figures 2 and 3. [24][25][26][27][28][29][30][31][32][33][34][35][36][37] The reader is cautioned that the data for the different materials were not necessarily obtained under comparable conditions and that all materials shown are under continuous development with progressively improving properties.…”

Section: -17mentioning

confidence: 99%

Ultrahigh-Temperature Materials for Jet Engines

Zhao¹,

Westbrook²

2003

MRS Bull.

263

102

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This introductory article provides the background for the September 2003 issue of MRS Bulletin on Ultrahigh-Temperature Materials for Jet Engines. It covers the need for these materials, the history of their development, and current challenges driving continued research and development. The individual articles that follow review achievements in four different material classes (three in situ composites-based on molybdenum silicide, niobium silicide, and silicon carbide, respectively-and high-melting-point platinum-group-metal alloys), as well as advances in coating systems developed both for oxidation protection and as thermal barriers. The articles serve as a benchmark to illustrate the progress made to date and the challenges ahead for ultrahigh-temperature jet-engine materials.

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Section: -17mentioning

confidence: 99%

Ultrahigh-Temperature Materials for Jet Engines

Zhao¹,

Westbrook²

2003

MRS Bull.

263

102

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“…Alloys of the Me-Si-B (MeZTi, Zr, V, Nb, Ta, Cr, Mo) systems have been recently investigated under several aspects motivated by characteristics, which make them promising materials for high-temperature structural applications [1][2][3][4][5][6][7][8]. The existence of phases (T 2 ; D8 8 ) containing significant Si and B amount, with high melting point [9][10][11] and good creep and oxidation resistance [12][13][14] has particularly inspired the studies in the Mo-Si-B and Nb-Si-B systems.…”

Section: Introductionmentioning

confidence: 99%

Thermal expansion of the Ti5Si3 and Ti6Si2B phases investigated by high-temperature X-ray diffraction

et al. 2006

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“…pct) alloy has a eutectic microstructure consisting of T 2 and 28 vol pct Mo solid solution (Mo ss ) phases, and shows an attractive combination of high strength at elevated temperatures and high fracture toughness at room temperature (RT). [9] Our choice of the Mo-9Si-18B alloy for study is not only due to its good balance of mechanical properties at elevated temperatures and RT, but also due to a simpler microstructure than the Mo-Si-B alloys, which others have studied.…”

Section: Introductionmentioning

confidence: 99%

Oxidation protective silicide coating on Mo-Si-B alloys

Ito

Numakura

Hayashi

et al. 2005

Metall Mater Trans A

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A MoSi 2 coating was successfully formed on a Mo-9Si-18B alloy, consisting of Mo 5 SiB 2 (T 2 ) and Mo solid solution (Mo ss ) phases, using pack cementation with Si. Isothermal and cyclic oxidation tests of pack-cemented Mo-9Si-18B alloys were performed at 1300 °C and 1500 °C. Steady-state oxidation rates at both temperatures are almost equal to those of pure MoSi 2 . The MoSi 2 layer is completely transformed into Mo 5 Si 3 (T 1 ) containing B after oxidation at 1500 °C for 24 hours. Thermal expansion of the T 1 phase is anisotropic, but a [001] texture in the growth direction for the columnar grains in the T 1 layer reduces thermal stresses generated around the phases. Evolution of T 1 layers during oxidation between 1300 °C and 1500 °C was investigated; their growth rate constants and the interdiffusion coefficient of Mo and Si in the Mo-Si-B system have been evaluated and compared with those in the binary Mo-Si system. Furthermore, we have studied phase transformations in a simpler system MoSi 2 vs T 2 using MoSi 2 /T 2 diffusion couples. Layers of T 1 and MoB ϩ T 1 were formed in the diffusion zone during oxidation at temperatures between 1400 °C and 1600 °C. This behavior is different from that of the pack-cemented Mo-9Si-18B alloy. Pack-cemented T 2 single crystals show a diffusion structure similar to that of MoSi 2 /T 2 diffusion couples, but the ratio of layer thickness is different. Based on these diffusion results, a method for extending the lifetime of the MoSi 2 layer is proposed.

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Room temperature fracture toughness and high temperature strength of T2/Moss and (Mo,Nb)ss/T1/T2 eutectic alloys in the Mo–Si–B system

Cited by 57 publications

References 15 publications

Ultrahigh-Temperature Materials for Jet Engines

Ultrahigh-Temperature Materials for Jet Engines

Thermal expansion of the Ti5Si3 and Ti6Si2B phases investigated by high-temperature X-ray diffraction

Oxidation protective silicide coating on Mo-Si-B alloys

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