Review: reaction synthesis processing of Ni–Al intermetallic materials

Morsi, K.

doi:10.1016/s0921-5093(00)01407-6

Cited by 383 publications

(134 citation statements)

References 75 publications

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“…This corresponds with the data quoted in literature [4,5] where in aluminum-based systems liquid Al without oxides on its surface usually initiates SHS synthesis. In the performed investigation, on the contrary to the literature data [6][7][8], no significant effect of the powder granularity on the microstructure or on the reaction course was observed. Distinct differences were observed in the reaction velocity, maximum temperature and the volume of residues of unprocessed Cr particles.…”

Section: Resultscontrasting

confidence: 92%

Manufacturing of Porous Al-Cr Preforms for Composite Reinforcing Using Microwave Activated Combustion Synthesis

Naplocha¹,

Granat²

2014

Archives of Metallurgy and Materials

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The combustion synthesis of porous skeletons (preforms) of intermetallic Al-Cr compounds intended for metal matrix composite MMC reinforcing was developed. Mixture of Al and Cr powders with granularity of −10, −44, −74µm were cold isostatic pressed and next ignited and synthetized in a microwave reactor under argon atmosphere (microwave-activated combustion synthesis MACS). In order to ignite the synthesis, microwave energy was focused by a tuner on the specimen. The analysis of reaction temperature diagrams revealed that the synthesis proceeded through the following peritectic transformations: L(liquidus)+Al7Cr→L+Al11Cr2→L+Al4Cr. Moreover, EDS and XRD examinations showed that the reaction proceeded between a solid Cr and a liquid Al to create a distinct envelope of Al 9 Cr 4 on Cr particle which next extended and spreaded over the entire structure. The produced preforms with uniform structure and interconnected porosity were infiltrated with liquid Cu and Al alloy. The obtained composite materials exhibited high hardness, wear and distinct temperature oxidation resistance.Keywords: SHS, microwave, Al-Cr, preform, compositeWytworzono poprzez syntezę spaleniową porowate preformy (szkielety) ze związków międzymetalicznych Al-Cr do umacniania materiałów kompozytowych o osnowie metalowej. Sprasowane na zimno, jednoosiowo (CIP) mieszaniny proszków Al i Cr o ziarnistości −10, −44, −74µm podgrzewano w reaktorze mikrofalowym w atmosferze argonu. W celu zainicjowania syntezy wykorzystano proces aktywacji mikrofalami MACS (microwave-activated combustion synthesis) skupiając promieniowanie na powierzchni próbki za pomocą stroika falowodowego. Na podstawie analizy krzywych temperatur ATD określono przebieg syntezy z następującymi przemianami perytektycznymi: L(liquidus)+Al7Cr→L+Al11Cr2→L+Al4Cr. Ponadto, analiza chemiczna EDS oraz fazowa XRD wykazały, że reakcja przebiega pomiędzy proszkiem Cr oraz ciekłym Al tworząc wyraźną otoczkę ze związku Al 9 Cr 4 na cząstkach Cr, które z postępem reakcji rozszerzają się i zanikają. Wytworzone preformy o jednorodnej strukturze z otwartymi porowatościami użyto do infiltracji ciekłym Al oraz Cu i wytworzenia kompozytów. Charakteryzowały się one dużą twardością, odpornością na ścieranie oraz odpornością na utlenianie w wysokiej temperaturze.

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Section: Resultscontrasting

confidence: 92%

Manufacturing of Porous Al-Cr Preforms for Composite Reinforcing Using Microwave Activated Combustion Synthesis

Naplocha¹,

Granat²

2014

Archives of Metallurgy and Materials

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“…According to the phase diagram [1], five kinds of structures of Al-Ni intermetallics are adopted. Further, the crystal structures of the Al-Ni intermetallics are optimized.…”

Section: Structuresmentioning

confidence: 99%

“…Aluminum-nickel (Al-Ni) alloy has high-strength, lower density and oxidation resistance and corrosion resistance in a variety of aluminum-based alloys [1]. However, it has ductility which limits its application [2].…”

Section: Introductionmentioning

confidence: 99%

First-principles Calculations of Structures and Micro-cracks of the Al-Ni Crystal Materials

Zhou¹,

Zhao²,

Wang³

et al. 2017

Proceedings of the 3rd Annual International Conference on Advanced Material Engineering (AME 2017)

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Abstract. The structures, elastic anisotropy, toughness, and Debye temperature of the Al-Ni crystal are analyzed by using the density functional theory: PW91. The results show that AlNi is the most anisotropic of all phase, and the Al3Ni2 is the most isotropic of all phase. In addition to Al3Ni and Al3Ni2 are brittle materials, other intermetallics are tougher materials. Among which, AlNi has the best toughness, and Al3Ni2 has the best brittleness. The study of Debye temperature suggests that Al3Ni has the highest Debye temperature, AlNi has the lowest Debye temperature.

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“…The reactant mixture is placed in a refractory container and ignited in air, vacuum or inert atmosphere at a pre-heating temperature rarely higher than 900 °C [15]. Combustion is initiated (sometimes with the aid of a spark) and the combustion zone propagates from one end of the compact to the other until all material has reacted [16,17]. The heat energy released heats up the remaining reagent mixture in front of the combustion zone thus the reaction is self-propagating and continues till the total consumption of the reactants.…”

Section: Combustion Synthesis (Cs)mentioning

confidence: 99%

Ni-Al and NiO-Al Composite Coatings by Combustion-Assisted Flame Spraying

et al. 2014

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Abstract:A new, cost-efficient and on-site-applicable thermal spraying process for depositing NiAl metallic overlay or bond-coat coatings for high temperature applications by synthesizing the desired intermetallic phases in-flight during oxy-acetylene flame spraying is presented. Base-metal powders were used for spraying and, by adjusting the spraying conditions, excellent NiAl-based coatings were achieved on various substrates, including mild steel, stainless steel and aluminium alloys. Expensive, pre-alloyed or agglomerated powders are avoided and the method is very promising for in-situ work and repairs. We call the new method "Combustion-Assisted Flame Spraying" (CAFSY) and its viability has been demonstrated at a pre-industrial level for coating metallic substrates. The NiAl-based coatings produced by CAFSY exhibit very high integrity with good adhesion, very low porosity, high surface hardness and high erosion resistance at a substantially lower cost than equivalent coatings using pre-prepared alloy powders.

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Review: reaction synthesis processing of Ni–Al intermetallic materials

Cited by 383 publications

References 75 publications

Manufacturing of Porous Al-Cr Preforms for Composite Reinforcing Using Microwave Activated Combustion Synthesis

Manufacturing of Porous Al-Cr Preforms for Composite Reinforcing Using Microwave Activated Combustion Synthesis

First-principles Calculations of Structures and Micro-cracks of the Al-Ni Crystal Materials

Ni-Al and NiO-Al Composite Coatings by Combustion-Assisted Flame Spraying

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