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Open AccessArticle

Amorphous Al-Ti Powders Prepared by Mechanical Alloying and Consolidated by Electrical Resistance Sintering

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Department of Materials and Transportation Engineering and Science, Escuela Politécnica Superior, Universidad de Sevilla, 41011 Sevilla, Spain
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Department of Materials and Transportation Engineering and Science, Escuela Técnica Superior de Ingeniería, Universidad de Sevilla, 41092 Sevilla, Spain
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School of Metallurgy and Materials, College of Engineering and Physical Sciences, University of Birmingham, Birmingham B15 2TT, UK
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Department of Chemical Engineering, Physical Chemistry and Materials Science, Escuela Técnica Superior de Ingeniería, Universidad de Huelva, 21071 Huelva, Spain
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Author to whom correspondence should be addressed.
Metals 2019, 9(11), 1140; https://doi.org/10.3390/met9111140
Received: 5 October 2019 / Revised: 21 October 2019 / Accepted: 22 October 2019 / Published: 24 October 2019
(This article belongs to the Special Issue Metals Powders: Synthesis and Processing)
A novel processing method for amorphous Al50Ti50 alloy, obtained by mechanical alloying and subsequently consolidated by electrical resistance sintering, has been investigated. The characterisation of the powders and the confirmation of the presence of amorphous phase have been carried out by laser diffraction, scanning electron microscopy, X-ray diffraction, differential scanning calorimetry and transmission electron microscopy. The amorphous Al50Ti50 powders, milled for 75 h, have a high hardness and small plastic deformation capacity, not being possible to achieve green compacts for conventional sintering. Moreover, conventional sintering takes a long time, being not possible to avoid crystallisation. Amorphous powders have been consolidated by electrical resistance sintering. Electrically sintered compacts with different current intensities (7–8 kA) and processing times (0.8–1.6 s) show a porosity between 16.5 and 20%. The highest Vickers hardness of 662 HV is reached in the centre of an electrically sintered compact with 8 kA and 1.2 s from amorphous Al50Ti50 powder. The hardness results are compared with the values found in the literature. View Full-Text
Keywords: electrical resistance sintering; amorphisation; crystallisation; mechanical alloying; Al-Ti powders; porosity; hardness electrical resistance sintering; amorphisation; crystallisation; mechanical alloying; Al-Ti powders; porosity; hardness
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MDPI and ACS Style

Urban, P.; Ternero, F.; Caballero, E.S.; Nandyala, S.; Montes, J.M.; Cuevas, F.G. Amorphous Al-Ti Powders Prepared by Mechanical Alloying and Consolidated by Electrical Resistance Sintering. Metals 2019, 9, 1140.

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