High Temperature Corrosion of Intermetallic Alloys

Fergus, Jeffrey W.

doi:10.1016/b978-044452787-5.00078-0

Cited by 6 publications

(5 citation statements)

References 94 publications

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“…The identification of reaction layer phases was accomplished via EDS chemical analysis, complemented by SEM observations and information obtained from the Ti-Al-Cu [24], Ti-Ag-Cu [25], Ti-Al [26], and Ti-Cu [27] phase diagrams. Figure 6 displays SEM images of the interfaces with details of the designated regions.…”

Section: Microstructural Characterizationmentioning

confidence: 99%

“…Due to the EDS volume of interaction and the low thickness of some of the regions, the possible phases were identified from microstructural observation combined with phase diagram data and chemical composition. The identification of reaction layer phases was accomplished via EDS chemical analysis, complemented by SEM observations and information obtained from the Ti-Al-Cu [24], Ti-Ag-Cu [25], Ti-Al [26], and Ti-Cu [27] phase diagrams. Figure 6 displays SEM images of the interfaces with details of the designated regions.…”

Section: Microstructural Characterizationmentioning

confidence: 99%

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Microstructure and Mechanical Properties of Ti6Al4V to Al2O3 Brazed Joints Using Ti-Ag/Cu-Ti Thin Films

Monteiro,

Simões

2024

Metals

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The processing and characterizing of bonding Ti6Al4V to Al2O3 brazed joints using interlayer thin films was investigated. The brazing was conducted in a tubular furnace with an argon flux at 980 °C for 30 min. The brazing fillers consisted of different combinations of thin Ag/Cu and Ti films with variable thicknesses. The joint interface analysis involved using digital microscopy (DM) and optical microscopy (OM). Microstructural characterization and chemical composition were performed via scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS). Mechanical properties were assessed through microhardness and shear strength tests. Brazing successfully produced interfaces with a combination of titanium films and Ag/Cu as brazing filler. The results revealed that the interface mainly comprises Ti2Cu, TiCu2Al, α-Ti, and Ti2(Cu,Ag). Some segregation of (Ag) was observed at the interfaces, but a decrease in its amount was observed when compared to joints produced using Ag/Cu fillers. The thickness of the titanium film in the brazing filler strongly influenced the integrity of the joints. The amount of (Ag) at the interface diminished as the Ti film’s thickness decreased, leading to an improvement in the mechanical properties of the joints. Using a combination of Ag/Cu and Ti thin films revealed a potential approach to reduce the segregation of soft phases at interfaces, promoting a significant improvement in joining metal to ceramic materials.

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Section: Microstructural Characterizationmentioning

confidence: 99%

Section: Microstructural Characterizationmentioning

confidence: 99%

Microstructure and Mechanical Properties of Ti6Al4V to Al2O3 Brazed Joints Using Ti-Ag/Cu-Ti Thin Films

Monteiro,

Simões

2024

Metals

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“…The efficiency of the pro- posed STPV system, calculated from the absorptance curves of the fabricated samples, is comparable to the achieved efficiencies in contemporary STPV systems. [46][47][48][49][50][51][52][53] Moreover, chromium metal, though it has the lowest melting point amongst refractory metals, presents exemplary characteristics of corrosion and oxidation resistance, 58,59 which are crucial for STPV applications. These well-known properties of chromium result from the formation of a very thin coating of chromium dioxide (Cr 2 O 3 ) on the surface 60 when chromium is exposed to air (sometimes referred to as self-passivation of chromium), this mechanism prevents any further oxidation, making chromium highly oxidation-resistant.…”

Section: System Efficiencymentioning

confidence: 99%

Nanostructured chromium-based broadband absorbers and emitters to realize thermally stable solar thermophotovoltaic systems

et al. 2022

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“…Titanium aluminide (TiAl) based materials possess the least densities compared to other widely known aluminides and can replace heavier-based materials such as nickel-based alloys in hightemperature applications such as automobile, power generation, and aerospace components. TiAlbased materials have attracted much attention as a result of their exceptional properties such as good corrosion, oxidation resistance, creep, high stiffness, and a low specific weight (3.8 -4.1 g/cm 3 ) [1][2][3][4][5]. These exceptional properties depend on the microstructure and phase constituents of the developed TiAl-based materials and the production route adopted.…”

Section: Introductionmentioning

confidence: 99%

Spark Plasma Sintering of TaN/TiAl Composites: Microstructure and Microhardness Study

Mkhwanazi

Babalola

Ayodele

et al. 2022

JERA

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Titanium aluminide (TiAl)-based materials have attracted much attention in the aerospace and automobile industries due to their attractive properties. Studying the microhardness of these materials as it relates to the as-sintered and heat-treated state is of interest in this article. TiAl and TiAl-based composites with varying additions of Tantalum nitride (TaN) content (2, 4, 6, 8 wt.%) were prepared by spark plasma sintering technique. The samples were sintered at 1150 °C, 100 C/min, 50 MPa, a dwell time of 10 mins, and fully dense characteristics as their relative densities were above 98 %. The microstructure and microhardness of the sintered samples were examined. Also, the sintered samples' microhardness was evaluated after the heat treatment process at 750 °C. It was observed that the relative density of the composites dropped at 2 and 8 wt.% addition of TaN, while the addition of TaN significantly increased hardness value in the as-sintered and heat-treated condition, from 304 HV to a maximum of 499 HV in the as-sintered state. The microstructures revealed that the reinforcement was segregated to the gamma phase, interlocked by the lamellar colonies.

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High Temperature Corrosion of Intermetallic Alloys

Cited by 6 publications

References 94 publications

Microstructure and Mechanical Properties of Ti6Al4V to Al2O3 Brazed Joints Using Ti-Ag/Cu-Ti Thin Films

Microstructure and Mechanical Properties of Ti6Al4V to Al2O3 Brazed Joints Using Ti-Ag/Cu-Ti Thin Films

Nanostructured chromium-based broadband absorbers and emitters to realize thermally stable solar thermophotovoltaic systems

Spark Plasma Sintering of TaN/TiAl Composites: Microstructure and Microhardness Study

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