Transformation temperatures and electrochemical behavior of polycrystalline Fe-Doped Ni-Mn-Ga and Co-Ni-Ga Alloys

"The effect of Fe addition on martensitic transformation temperatures and electrochemical behavior was studied in polycrystalline Ni51.4Mn24.8-XGa23.8FeX alloys (1<x<2.2) and Co38.3Ni32.1Ga29.6 as alternative to Ni-Mn-Ga alloys which are used as ferromagnetic shape memory alloys. The anal...

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Detalhes bibliográficos
Autores: MARIO SANCHEZ CARRILLO, JUAN PABLO FLORES DE LOS RIOS, CLAUDIA GEORGINA NAVA DINO, Horacio Flores Zúñiga, Roberto Narro García, María Cristina Maldonado Orozco, FRANCISCO HUMBERTO ESTUPIÑAN LOPEZ, JOSE GUADALUPE CHACON NAVA
Formato: artículo
Estado:Versión publicada
Fecha de publicación:2018
País:México
Recursos:Instituto Potosino de Investigación Científica y Tecnológica
Repositorio:Repositorio Institucional del IPICYT
OAI Identifier:oai:ipicyt.repositorioinstitucional.mx:1010/1947
Acesso em linha:http://ipicyt.repositorioinstitucional.mx/jspui/handle/1010/1947
Access Level:acceso abierto
Palavra-chave:info:eu-repo/classification/Autor/Shape memory alloys
info:eu-repo/classification/Autor/Polarization curves
info:eu-repo/classification/Autor/Polycrystalline
info:eu-repo/classification/Autor/Corrosion
info:eu-repo/classification/Autor/Calorimetry
info:eu-repo/classification/Autor/Morphology
info:eu-repo/classification/cti/2
info:eu-repo/classification/cti/23
Descrição
Resumo:"The effect of Fe addition on martensitic transformation temperatures and electrochemical behavior was studied in polycrystalline Ni51.4Mn24.8-XGa23.8FeX alloys (1<x<2.2) and Co38.3Ni32.1Ga29.6 as alternative to Ni-Mn-Ga alloys which are used as ferromagnetic shape memory alloys. The analysis of corrosion rates was conducted by cyclic polarization curves with potentiostat-galvanostat equipment. The corrosion morphologies were also analyzed by scanning electron microscopy (SEM). The kinetics of corrosion was found to decrease with increasing Fe content in the alloy, while the martensitic transformation temperatures increased with increasing Fe content. The Co38.3Ni32.1Ga29.6 alloy shows i(corr) lower than the Ni-Mn-Ga alloy. From results, the studied alloys exhibited a general dissolution in the anodic branch where a spontaneous passive zone occurred at certain potential and some elements like Co, Mn and also Ni were present in a higher percentage in corrosion deposits."

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