Ordered intermetallic alloys: an assessment

Liu, C.T.; Stringer, J.; Mundy, J. N.; Horton, L.L.; Angelini, P.

doi:10.1016/s0966-9795(97)00045-9

Cited by 212 publications

(85 citation statements)

References 62 publications

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“…18 Also, samples pre-oxidized in dry and wet air were fractured in-situ in high vacuum to expose the oxide-metal interface, where hydrogen was found by proton-induced gamma emission techniques. 19 It is also apparent from the literature that moist environments cause similar intriguing detrimental effects on the ductility of [20][21][22][23][24][25] Hydrogen embrittlement of single-crystal superalloys has also been identifi ed. 26,27 Classic hydrogen embrittlement exhibits many features in common with delayed scale spallation as listed in Table A: an interfacial aspect, an intermittent nature depending on hydrogen diffusion ahead of the crack tip, the necessity of a tensile stress state, a negative synergy with segregated sulfur, and a reduction in the theoretical bond strength.…”

Section: Additional Supporting Studiesmentioning

confidence: 99%

Moisture-induced delayed spallation and interfacial hydrogen embrittlement of alumina scales

Smialek

2006

JOM

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Section: Additional Supporting Studiesmentioning

confidence: 99%

Moisture-induced delayed spallation and interfacial hydrogen embrittlement of alumina scales

Smialek

2006

JOM

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“…[1][2][3][4][5][6][7] Extensive research works have focused on developing the advanced aerospace structure and propulsion systems. Those candidates are mostly the compounds with metallic bonding such as NiAl, [8][9][10] Ni 3 Al [11][12][13][14][15][16] and TiAl [17][18][19][20][21][22][23] due to the combination of high melting temperature, low density and excellent corrosion resistance.…”

Section: Introductionmentioning

confidence: 99%

Thermal Conductivity of Intermetallic Compounds with Metallic Bonding

et al. 2002

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Thermal conductivity is one of the key parameters required for high-temperature structural applications of metallic materials. In this overview, the thermal conductivity of intermetallic compounds are extensively described based mainly on our past works, since there had been less works in this research field. Emphasis is placed on the B2 and the L1 2 compounds with metallic bonding such as NiAl, Ni 3 Al, etc., which have been attracting attention for engineering applications at higher temperatures. The thermal conductivity data have been accumulated for the intermetallic compounds, and the phenomenological aspects are reviewed in detail as a function of alloy composition, constituent and temperature. The Wiedemann-Franz law is applicable to the intermetallic compounds, indicating that the carrier of thermal conduction is an electron rather than a phonon. The thermal conductivity of an intermetallic compound with the ordered crystal structure is characterized as an enhancement due to ordering with reference to the basic contribution of solid solution with the disordered crystal structure. It is demonstrated that the thermal conductivity of intermetallic compounds is reduced by the addition of a third element, and this subject is also covered.

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“…2b) demonstrates good mechanical properties and excellent oxidation behavior up to 1300 K. FeAl-FexAly powder. Due to the high Young s modulus, high elevated temperature strength retention, excellent corrosion resistance in oxidizing, sulfiding or carburizing environments up to 1000 , relatively low density as compared with stainless steels and nickel superalloys, and low price of raw materials 95) , FeAl intermetallic alloys based on the ordered B2 structure are very attractive materials for medium-temperature applications. However, poor room temperature ductility, low creep resistance and sensibility to environmental embrittlement restrict their industrial applications as structural parts.…”

Section: Refractor Y Compoundsmentioning

confidence: 99%

SHS Powders for Thermal Spray Coating

Talako

Ilyuschenko

Лецко

2009

KONA

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2009 Hosokawa Powder Technology Foundation IntroductionModern industrial technologies call for the development of novel materials with improved properties, lower costs and environmentally suitable processes. Surface engineering that attempts to create functional layers on the surface is obviously the most economical way to provide high per formance to machiner y and equipment. Among the wide range of available methods (including varieties of atomistic and par ticulate deposition, bulk coatings wetting processes and surface modification), thermal spray coatings offer the most versatile solutions. Thermal spray processes form a continuous coating by melting the consumable material (feedstock) to form droplets and impinging these droplets on the substrate. The mechanism of bonding to the substrate in thermal sprayings (TS) is the same as plating, both mechanical interlocking and atomic interaction, with the shear strength around 7 MPa 1). The thickness of the coatings can range from 10 µm to a few millimeters 2) . Other advantages of thermal spraying include a practically unlimited assortment of powders to be sprayed, high efficiency and relatively low substrate temperature (373-583 K), thus minimizing shape distortion, oxidation and phase transformations in the near-surface layer. Demanded characteristics for thermal spray feedstock powders can be very different, depending on the spraying process, the operating conditions, the desired properties of the final coating, etc. Besides the intrinsic material properties, the technical requirements for the TS feedstock powders include good flowability and sprayability. They are greatly affected by the particle size, shape and morphology as well as particle size distribution. That is why thermal spray feedstock powder production processes must be reliable and flexible, while remaining as inexpensive as possible.Self-propagating high-temperature synthesis (SHS) or combustion synthesis, discovered by A.G. Merzhanov and colleagues in 1967, is known as a ver y promising technique for processing materials (ceramics, intermetallics, cermets, etc.) with good physical and chemical properties at relatively low costs 3,4) . The main point of the process is that after localized initiation, the reaction propagates as a narrow zonecombustion wave -along a sample driven by the exothermic reaction between components of the charge mixture without the application of external heating (furnaces, etc.). Because of the extreme conditions in the SHS wave (high temperature of up to 3500 , fast heating of up to 10 6 K/s, steep temperature gradient of up to 10 5 K/cm, rapid cooling in the after-burn zone of up to 100 K/s, and fast accomplishment of reaction, 0.5 s to 1 min), chemical interaction mechanisms during the SHS are often non-equilibrium, resulting in the formation of materials with improved structure and properties, especially in multi-component composite systems [3][4][5][6] . Moreover, a product with increased purity can be obtained due to evaporation of volatile impurities at th...

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Ordered intermetallic alloys: an assessment

Cited by 212 publications

References 62 publications

Moisture-induced delayed spallation and interfacial hydrogen embrittlement of alumina scales

Moisture-induced delayed spallation and interfacial hydrogen embrittlement of alumina scales

Thermal Conductivity of Intermetallic Compounds with Metallic Bonding

SHS Powders for Thermal Spray Coating

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