Industrially fabricated in-situ Al-AlN metal matrix composites (part A): Processing, thermal stability, and microstructure

Balog, Martin; Krížik, Peter; Švec, P.; Orovčík, Ľubomír

doi:10.1016/j.jallcom.2021.160858

Cited by 26 publications

(17 citation statements)

References 42 publications

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“…Oxygen traps-also known as getter agents-can also be added as sacrifice material to oxidize preferentially and reduce the amount of available oxygen in the atmosphere [88]. Those oxygen traps can be made of metals presenting higher affinity to oxygen [89], such as using magnesium as a getter agent for aluminum. A getter material can be any metal that displays lower free energy of oxidation at the given temperature, as can be easily visualized in Ellingham diagrams [89,90].…”

Section: Atmospherementioning

confidence: 99%

“…Those oxygen traps can be made of metals presenting higher affinity to oxygen [89], such as using magnesium as a getter agent for aluminum. A getter material can be any metal that displays lower free energy of oxidation at the given temperature, as can be easily visualized in Ellingham diagrams [89,90]. Oxygen traps can be also made of the same metal one intends to protect, using a sacrifice sample placed at a slightly cooler region of the furnace, where the driving force for oxide formation is higher.…”

Section: Atmospherementioning

confidence: 99%

See 1 more Smart Citation

Design of In Situ Metal Matrix Composites Produced by Powder Metallurgy—A Critical Review

Deschamps

Avila

Piazera

et al. 2022

Metals

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In situ composite manufacture is an approach to improve interfacial adhesion between matrix and reinforcements, in which reinforcements are synthesized along composite processing itself. In situ powder metallurgy route, in particular, offers alternatives to some shortcomings found in other techniques. This work aims not only to review the state of the art on metal matrix composites (MMCs)—including cermets—obtained in situ by powder metallurgy, but also to dissect key aspects related to the development of such materials in order to establish theoretical criteria for decision making before and along experiments. Aspects regarding the design, raw material selection, and processing of such composites were observed and divided between concept, intrinsic, and extrinsic parameters. That way, by means of material databases and computational thermodynamics applied to examples of the reviewed literature, we aim at providing tools in both conducting leaner experiments and richer discussion in this field.

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Section: Atmospherementioning

confidence: 99%

Section: Atmospherementioning

confidence: 99%

Design of In Situ Metal Matrix Composites Produced by Powder Metallurgy—A Critical Review

Deschamps

Avila

Piazera

et al. 2022

Metals

View full text Add to dashboard Cite

show abstract

“…These include high corrosion resistance, high hardness, an excellent strength-to-weight ratio, good bio-compatibility, a low thermal expansion coefficient and high thermal conductivity [ 1 , 2 , 3 , 4 , 5 ]. This combination of properties makes AlN a desirable choice for applications such as heat sinks [ 6 , 7 ], semiconductors [ 8 ], coatings for optical devices [ 9 ], surface hardening, wear coatings and as a reinforcement for metal-based composites [ 10 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

“…Various processes have been developed that utilise the low-temperature direct nitridation of Al powder, incorporating small amounts of Mg for the preparation of in situ reinforced Al/AlN metal matrix composites (MMCs) [ 11 , 28 ]. The AlN forms as layers on Al surfaces exposed to the nitrogen atmosphere.…”

Section: Introductionmentioning

confidence: 99%

“…The in situ formed AlN possesses greater thermodynamic stability, fewer microstructure defects and enhanced interfacial bonding with the matrix [ 11 , 20 ]. Powder metallurgy-based methods for consolidation of ex situ reinforced Al/AlN MMCs using conventional commercial AlN powders are compromised by the inert nature of the reinforcement at the low temperatures required for sintering Al.…”

Section: Introductionmentioning

confidence: 99%

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Impacts of Temperature and Time on Direct Nitridation of Aluminium Powders for Preparation of AlN Reinforcement

2023

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Aluminium nitride (AlN) is an important technical ceramic with outstanding strength and thermal conductivity that has important applications for advanced heat sink materials and as a reinforcement for metal-based composites. In this study, we report a novel, straightforward and low-cost method to prepare AlN powder using a vacuum tube furnace for the direct nitridation of loose aluminium powder at low temperatures (down to 500 ∘C) under flowing high-purity nitrogen. Small amounts of magnesium powder (1 wt.%), combined with aluminium, promote nitridation. Here, we characterise the effects of time (up to 12 h) and temperature (490 to 560 ∘C) on nitridation with the aim to establish an effective regimen for the controlled synthesis of an aluminium nitride reinforcement powder for the production of metal matrix composites. The extent of nitridation and the morphology of the reaction products were assessed using scanning electron microscopy and X-ray diffraction analyses. AlN was detected for all nitriding temperatures ≥ 500 ∘C, with the highest yields of 80% to 85% obtained at 530 ∘C for times ≥ 1 h. At this temperature, nitridation proceeded rapidly, and there was extensive agglomeration of the reaction products making it difficult to reprocess into powder. At lower temperatures around 510 ∘C, a relatively high proportion of AlN was attained (>73% after 6 h) while retaining excellent friability so that it could be manually reprocessed to powder. The synthesised reinforcement consisted of micro- or nano-crystalline AlN comingled with metallic aluminium. The ratio of AlN and metallic aluminium can be readily controlled by varying the nitriding temperature. This provides a flexible and accessible method for the production of AlN-reinforcement powders suited to the production of metal matrix composites.

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Revealing the Relationship Between AlN Architectures and the Strengthening Mechanism of the AlN/Al Composites at 350 °C

Zhao

Xie

et al. 2022

J. of Materi Eng and Perform

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Industrially fabricated in-situ Al-AlN metal matrix composites (part A): Processing, thermal stability, and microstructure

Cited by 26 publications

References 42 publications

Design of In Situ Metal Matrix Composites Produced by Powder Metallurgy—A Critical Review

Design of In Situ Metal Matrix Composites Produced by Powder Metallurgy—A Critical Review

Impacts of Temperature and Time on Direct Nitridation of Aluminium Powders for Preparation of AlN Reinforcement

Revealing the Relationship Between AlN Architectures and the Strengthening Mechanism of the AlN/Al Composites at 350 °C

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