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Metals 2016, 6(9), 208;

Study of the Isothermal Oxidation Process and Phase Transformations in B2-(Ni,Pt)Al/RENE-N5 System

Centro de Investigación y de Estudios Avanzados del IPN, Unidad Querétaro, Libramiento Norponiente 2000, Real de Juriquilla, 76230 Querétaro, Mexico
Centro de Ingeniería Avanzada y Desarrollo Industrial, CIDESI-Querétaro, Av. Pie de la Cuesta No. 702, 76125 Santiago de Querétaro, Mexico
CONACYT-Universidad Autónoma de Zacatecas, Av. Ramón López Velarde 801, 98000, Centro Zacatecas, Zacatecas Mexico
Centro de Tecnología Avanzada, CIATEQ A.C.-San Agustín del Retablo 150, Constituyentes Fovissste, 76150 Querétaro, Mexico
Materials Science and Engineering Department, Texas A & M University, College Station, TX 77843, USA
German Aerospace Center (DLR), Institute of Materials Research, D-51170 Cologne, Germany
Author to whom correspondence should be addressed.
Academic Editor: Hugo Lopez
Received: 8 June 2016 / Revised: 26 July 2016 / Accepted: 20 August 2016 / Published: 1 September 2016
(This article belongs to the Special Issue Intermetallics 2016)
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Changes in composition, crystal structure and phase transformations of B2-(Ni,Pt)Al coatings upon isothermal oxidation experiments (natural and scale free oxidation) at 1100 °C, as a function of time beyond their martensitic transformation, are reported. Specifically, the analysis of lattice parameter and composition are performed to identify changes in the B2-(Ni,Pt)Al phase upon the chemically-driven L10-(Ni,Pt)Al and L12-(Ni,Pt)3Al transformations. The B2-(Ni,Pt)Al phase was found to disorder and transform the martensite during the heat treatments for both oxidation experiments at approximately 36.3 and 40.9 at. % of Al, 47.7 and 42.9 at. % of Ni, 6.2 and 8.5 at. % of Pt, 4.2 and 2.9 at. % of Cr and 4.4 and 3.8 at. % of Co. The lattice constant and the long-range order parameter of the B2-(Ni,Pt)Al phase decreased linearly as a function of the elemental content irrespective of the nature of the oxidation experiments. View Full-Text
Keywords: B2-(Ni,Pt)Al bond coatings; oxidation; martensitic transformation; crystal structure B2-(Ni,Pt)Al bond coatings; oxidation; martensitic transformation; crystal structure

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Cáceres-Díaz, L.A.; Alvarado-Orozco, J.M.; Ruiz-Luna, H.; García-Herrera, J.E.; Mora-García, A.G.; Trápaga-Martínez, G.; Arroyave, R.; Muñoz-Saldaña, J. Study of the Isothermal Oxidation Process and Phase Transformations in B2-(Ni,Pt)Al/RENE-N5 System. Metals 2016, 6, 208.

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