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Microstructure and mechanical properties of NiCoCrAlYTa alloy processed by press and sintering route

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Microstructure and mechanical properties of NiCoCrAlYTa alloy processed by press and sintering route

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dc.contributor.author Pereira Falcón, Juan Carlos es_ES
dc.contributor.author ZAMBRANO CARRULLO, JENNY CECILIA es_ES
dc.contributor.author Afonso, Conrado Ramos Moreira es_ES
dc.contributor.author Amigó Borrás, Vicente es_ES
dc.date.accessioned 2015-07-06T09:46:28Z
dc.date.available 2015-07-06T09:46:28Z
dc.date.issued 2015-03
dc.identifier.issn 1044-5803
dc.identifier.uri http://hdl.handle.net/10251/52710
dc.description.abstract Nickel-based superalloys such as NiCoCrAlY are widely used in high-temperature applications, such as gas turbine components in the energy and aerospace industries, due to their strength, high elastic modulus, and high-temperature oxidation resistance. However, the processing of these alloys is complex and costly, and the alloys are currently used as a bond coat in thermal barrier coatings. In this work, the effect of cold press and sintering processing parameters on the microstructure and mechanical properties of NiCoCrAlY alloy were studied using the powder metallurgy route as a new way to obtain NiCoCrAlYTa samples from a gas atomized prealloyed powder feedstock. High mechanical strength and adequate densification up to 98% was achieved. The most suitable compaction pressure and sintering temperature were determined for NiCoCrAlYTa alloy through microstructure characterization. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and energy dispersive spectroscopy microanalysis (EDS) were performed to confirm the expected γ-Ni matrix and β-NiAl phase distribution. Additionally, the results demonstrated the unexpected presence of carbides and Ni-Y-rich zones in the microstructure due to the powder metallurgy processing parameters used. Thus, microhardness, nanoindentation and uniaxial compression tests were conducted to correlate the microstructure of the alloy samples with their mechanical properties under the different studied conditions. The results show that the compaction pressure did not significantly affect the mechanical properties of the alloy samples. In this work, the compaction pressures of 400, 700 and 1000 MPa were used. The sintering temperature of 1200 °C for NiCoCrAlYTa alloy was preferred; above this temperature, the improvement in mechanical properties is not significant due to grain coarsening, whereas a lower temperature produces a decrease in mechanical properties due to high porosity and poor solid-state diffusion. es_ES
dc.description.sponsorship The authors would like to acknowledge the economic support of the Spanish Ministry of Science and Innovation of the Government of Spain through research project MAT2011-28492-C03 and the Generalitat Valenciana (ACOMP/2013/114). Furthermore, the authors thank Dr. Jose Luis Jorda for the XRD analysis. en_EN
dc.language Inglés es_ES
dc.publisher Elsevier es_ES
dc.relation Government of Spain through research project MAT2011-28492-C03 es_ES
dc.relation Generalitat Valenciana (ACOMP/2013/114) es_ES
dc.relation.ispartof Materials Characterization es_ES
dc.rights Reserva de todos los derechos es_ES
dc.subject NiCoCrAlYTa es_ES
dc.subject Powder metallurgy es_ES
dc.subject Cold press es_ES
dc.subject Sintering es_ES
dc.subject.classification CIENCIA DE LOS MATERIALES E INGENIERIA METALURGICA es_ES
dc.title Microstructure and mechanical properties of NiCoCrAlYTa alloy processed by press and sintering route es_ES
dc.type Artículo es_ES
dc.identifier.doi 10.1016/j.matchar.2015.02.001
dc.rights.accessRights Cerrado es_ES
dc.contributor.affiliation Universitat Politècnica de València. Instituto de Tecnología de Materiales - Institut de Tecnologia de Materials es_ES
dc.contributor.affiliation Universitat Politècnica de València. Departamento de Ingeniería Mecánica y de Materiales - Departament d'Enginyeria Mecànica i de Materials es_ES
dc.description.bibliographicCitation Pereira Falcon, JC.; Zambrano Carrullo, JC.; Afonso, CRM.; Amigó Borrás, V. (2015). Microstructure and mechanical properties of NiCoCrAlYTa alloy processed by press and sintering route. Materials Characterization. 101:159-165. doi:10.1016/j.matchar.2015.02.001 es_ES
dc.description.accrualMethod S es_ES
dc.relation.publisherversion http://dx.doi.org/10.1016/j.matchar.2015.02.001 es_ES
dc.description.upvformatpinicio 159 es_ES
dc.description.upvformatpfin 165 es_ES
dc.type.version info:eu-repo/semantics/publishedVersion es_ES
dc.description.volume 101 es_ES
dc.relation.senia 281063


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