Molybdeno-Aluminizing of Powder Metallurgy and Wrought Ti and Ti-6Al-4Valloys by Pack Cementation process

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Show simple item record Tsipas, Sophia Alexandra Gordo Odériz, Elena 2016-06-29T10:44:35Z 2018-06-23T22:00:05Z 2016
dc.identifier.bibliographicCitation Materials Characterization [In press]
dc.identifier.issn 1044-5803
dc.description El artículo está disponible online en la web del editor (Elsevier) desde el 23 de junio de 2016.
dc.description.abstract Wear and high temperature oxidation resistance of some titanium-based alloys needs to be enhanced, and this can beeffectively accomplished by surface treatment. Molybdenizing is a surface treatment where molybdenum is introducedinto the surface of titanium alloys causing the formation of wear-resistant surface layers containing molybdenum, whilealuminizing of titanium-based alloys has been reported to improve their high temperature oxidation properties. Whereaspack cementation and other surface modification methods have been used for molybdenizing or aluminizing of wroughtand/or cast pure titanium and titanium alloys, such surface treatments have not been reported on titanium alloys producedby powder metallurgy (PM). Also a critical understanding of the process parameters for simultaneous one stepmolybdeno-aluminizing of titanium alloys by pack cementation and the predominant mechanism for this process havenot been reported. The current research work describes the surface modification of titanium and Ti-6Al-4V prepared byPM by molybdeno-aluminizing and analyzes thermodynamic aspects of the deposition process. Similar coatings are alsodeposited to wrought Ti-6Al-4V and compared. Characterization of the coatings was carried out using scanning electronmicroscopy and x-ray diffraction. For both titanium and Ti-6Al-4V, the use of a powder pack containing ammoniumchloride as activator leads to the deposition of molybdenum and aluminium into the surface but also introduces nitrogencausing the formation of a thin titanium nitride layer. In addition, various titanium aluminides and mixed titanium aluminiumnitrides are formed. The appropriate conditions for molybdeno-aluminizing as well as the phases expected to beformed were successfully determined by thermodynamic equilibrium calculations.
dc.description.sponsorship Regional Government of Madridthrough the project S2013/MIT-2862 (MULTIMAT-CHALLENGE-CM), and by the Ministry of Economy and Competitiveness of Spain through the project MAT2012/38650-C02-01
dc.format.extent 14
dc.format.mimetype application/pdf
dc.language.iso eng
dc.publisher Elsevier
dc.rights Elsevier
dc.rights Atribución-NoComercial-SinDerivadas 3.0 España
dc.subject.other Ti-6Al-4V
dc.subject.other Molybdenizing
dc.subject.other Powder metallurgy
dc.subject.other Thermodynamic calculations
dc.subject.other Pack cementation
dc.title Molybdeno-Aluminizing of Powder Metallurgy and Wrought Ti and Ti-6Al-4Valloys by Pack Cementation process
dc.type article
dc.subject.eciencia Materiales
dc.identifier.doi 10.1016/j.matchar.2016.06.028
dc.rights.accessRights openAccess
dc.relation.projectID Comunidad de Madrid. S2013/MIT-2862
dc.relation.projectID Gobierno de España. MAT2012-38650-C02-01
dc.type.version acceptedVersion
dc.identifier.publicationtitle Materials characterization
dc.identifier.uxxi AR/0000017999
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