Nickel aluminides

Talaş, Şükrü

doi:10.1016/b978-0-85709-346-2.00003-0

Cited by 7 publications

(9 citation statements)

References 162 publications

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“…An increase in stability determines the durability and reliability of the work of products made of heat-resistant alloys. The experimentally obtained results on the electrical resistivity of NiAl at room temperature (ρ NiAl = 16 μΩ cm) are consistent with the results of studies [23,24] (ρ NiAl = 8-16 μΩ cm) in the measured temperature range.…”

Section: Resultssupporting

confidence: 89%

Effect of Carbon on the Electrical Resistivity of Ni–Al Intermetallic Alloy Synthesized by an Electrothermal Explosion under Pressure

Sytschev

Karpov

Щербаков

2021

Inorg. Mater. Appl. Res.

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The effect of carbon (3 wt %) on the electrical resistivity of alloys based on aluminum nickelides Ni-Al and Ni-Al-C synthesized by electrothermal explosion in the temperature range of 300-1300 K in a vacuum of 2 × 10 -3 Pa has been studied. At an electrothermal explosion in a powder reaction medium, a Ni-Al-based melt is formed in which carbon dissolves. It is shown that, during the crystallization of the final product, due to its low solubility in Ni-Al, carbon is located at the boundaries of intermetallic grains of Ni-Al in the form of multilayer graphite nanofilms 50-80 nm thick, filling the intergranular space. It is shown that the synthesized alloys have a metallic character of conductivity, and the electrical resistivity in the measured temperature range of 300-1300 K increases monotonically for Ni-Al from 16 to 40 μΩ cm and for the carbon-bearing alloy Ni-Al-C from 22 to 60 μΩ cm. In this case, an increase in the temperature coefficient of resistance (TCR) is also observed from 1.45 × 10 -3 K -1 for Ni-Al to 1.77 × 10 -3 K -1 for Ni-Al-C. The slope of the curves of the dependence of electrical resistance on temperature in the studied temperature range of 300-1300 K remains constant and is well described by a linear function.

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Section: Resultssupporting

confidence: 89%

Effect of Carbon on the Electrical Resistivity of Ni–Al Intermetallic Alloy Synthesized by an Electrothermal Explosion under Pressure

Sytschev

Karpov

Щербаков

2021

Inorg. Mater. Appl. Res.

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“…Sticking of droples due to spattering was eliminated almost 100% because of a thermal barrier effect and also possibly due to oxidation of coating. Intermetallic based NiAl coating by ESD also limits the formation of surface alloying in case of spatter (in the form of molten droplets from the arc plasma) strike the surface of contact tip as the compound Al 2 O 3 on NiAl coating surface [13] has a high melting point and chemically inert as a substrate [27]. NiAl coatings perform better than uncoated surfaces due possibly to their best resistance against corrosion at high temperatures by which weld tips become softer and more prone to wear.…”

Section: 3the Testing Of Weld Tipsmentioning

confidence: 99%

“…NiAl dry sliding wear test also showed that, with increasing Al, the wear rate decreases [28] and in general wear rate of NiAl intermetallics are 3 times better than that of Cu in pure form [29]. The arc temperature may reach above 10,000K [1] but nozzle temperature may only reach around 500C [2], which is still lower than transformation point of NiAl [13] and may not be enough to make some intermetallics ductile but with toughness unlike of Cu. At this temperature, sliding wire may grind away Cu more than intermetallic phase coating but a harder coating will also prevent the Cu from being ground away and improve the service performance with a possible constriction.…”

Section: The Abrasion Tests Of Nial and Nial 3 Intermetallicsmentioning

confidence: 99%

“…An intermetallic is a type of metallic alloy that forms an ordered solid-state compound between two or more metallic elements. Intermetallics are generally hard and brittle, with good high-temperature mechanical properties and Nickel aluminides are one of the most feasible type of intermetallics in use [13]. NiAl and Ni 3 Al intermetallics, types of nickel based intermetallics, have low density and excellent high temperature resistance against oxidation wear behaviour.…”

Section: Introductionmentioning

confidence: 99%

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The use of NiAl Coating Deposited by ESD Against the Wear of Sliding Wire in GMAW Contact Tips

YAZAR¹,

Kul²,

Kemal³

et al. 2022

Politeknik Dergisi

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❖ NiAl coating has improved the service life of GMAW weld contact tips by 50% compared to uncoated tips. ❖ ESD coating of contact tips with NiAl generated phases that are different to NiAl electrode material. ❖ An industrially viable coating parameter for contact tips were sucessfully tested. ❖ NiAl coating generated surface hardness higher than that of Copper substrate by alloying. ❖ Spatter on the surface of contact tips were reduced dramatically, providing a better working conditions.

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“…Single-phase B2 structure is perfectly suitable for high-temperature structural applications due to the enhancement of NiAl properties at the required temperature. Unfortunately, NiAl intermetallic has poor ductility and low fracture toughness at room temperature [5].…”

Section: Introductionmentioning

confidence: 99%

Nickel Aluminide intermetallic composites fabricated by various processing routes – a review

Azhagarsamy

Sekar

Murali

2022

Materials Science and Technology

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Nickel Aluminide intermetallic is a distinctive material for high-temperature applications with remarkable properties. This review article discusses the Nickel Aluminide intermetallic fabricated by various processing techniques like hot pressing, self-propagating high-temperature synthesis, spark plasma sintering, and additive manufacturing. Generally, Nickel Aluminide is blended mostly with chromium, molybdenum, and hafnium reinforcements. These elements increase the tensile property of the base alloy. Mechanical alloying produces nanoparticles with homogeneous distribution for attaining composites with better properties. Nickel Aluminide intermetallic has low ductility and fracture toughness. However, hot pressing improves the ductility and fracture toughness as sintering promotes strengthening mechanisms. In recent years, additive manufacturing has been preferred to build different intermetallic materials.

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Nickel aluminides

Cited by 7 publications

References 162 publications

Effect of Carbon on the Electrical Resistivity of Ni–Al Intermetallic Alloy Synthesized by an Electrothermal Explosion under Pressure

Effect of Carbon on the Electrical Resistivity of Ni–Al Intermetallic Alloy Synthesized by an Electrothermal Explosion under Pressure

The use of NiAl Coating Deposited by ESD Against the Wear of Sliding Wire in GMAW Contact Tips

Nickel Aluminide intermetallic composites fabricated by various processing routes – a review

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