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Materials 2018, 11(5), 823; https://doi.org/10.3390/ma11050823

In Situ Synthesis of Al-Based MMCs Reinforced with AlN by Mechanical Alloying under NH3 Gas

1
Escuela Técnica Superior de Ingeniería, Universidad de Sevilla, Camino de los Descubrimientos, s/n. 41092 Sevilla, Spain
2
Escuela Técnica Superior de Ingeniería, Universidad de Huelva, Campus El Carmen, Avda. 3 de marzo, s/n. 21071 Huelva, Spain
*
Author to whom correspondence should be addressed.
Received: 23 April 2018 / Revised: 12 May 2018 / Accepted: 15 May 2018 / Published: 17 May 2018
(This article belongs to the Section Advanced Composites)
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Abstract

Aluminum matrix composites (AMCs) reinforced by aluminum nitride were prepared by mechanical alloying followed by a simple press and sintering method. Milling began under vacuum and after a period of between 1 and 4 h, NH3 gas flow (1 cm3/s) was incorporated until the total milling time of 5 h was reached. Results show that in addition to the strain hardening taking place during mechanical alloying, NH3 plays an additional role in powder hardening. Thereby, the properties of the sintered compacts are strongly influenced by the amount of N incorporated into the powders during milling and the subsequent formation of AlN during the consolidation process. The obtained AMC reaches tensile strengths as high as 459 MPa and hardness much higher than that of the as-received aluminum compact. View Full-Text
Keywords: aluminum; AMCs; powder metallurgy; mechanochemical processing; mechanical properties aluminum; AMCs; powder metallurgy; mechanochemical processing; mechanical properties
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Caballero, E.S.; Cuevas, F.G.; Ternero, F.; Astacio, R.; Montes, J.M.; Cintas, J. In Situ Synthesis of Al-Based MMCs Reinforced with AlN by Mechanical Alloying under NH3 Gas. Materials 2018, 11, 823.

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