Mechanical properties and microstructural stability of CuTa/Cu composite coatings
Por:
Bahrami, Amin, Onofre Carrasco C.F., Cardona, Arturo Delgado, Huminiuc, Teodor, Polcar, Tomas, Rodil, Sandra E.
Publicada:
1 ene 2019
Resumen:
In this study, the structure and mechanical properties of as-deposited and 823.15 K annealed CuTa coatings were studied with the purpose to evaluate the microstructural and mechanical thermal stability as a function of the Ta content. CuTa coatings with a Ta content from 0 to 100% were prepared by magnetron co-sputtering. Their structure and mechanical properties were characterized by grazing angle X-ray diffraction (XRD), scanning and transmission electron microscopy (TEM), and nanoindentation. The XRD results show that a Ta-rich CuTa glass metal is formed in the coatings with 15–67 at.% Ta along with nanocrystalline Cu and such microstructure was retained after vacuum annealing at 823.15 K. TEM analyses of selected samples showed the formation of crystalline Cu islands in an amorphous CuTa matrix in both as-deposited and annealed coatings. The coatings presented a 3D distribution of Cu nanocrystals within an amorphous CuTa matrix which might reduce the brittleness of the glassy CuTa matrix. A significant increase in hardness values from 0.9 GPa for pure Cu to 11.9 GPa for the sample with 98 at.% Ta is observed. It has been shown that the composite coatings preserved the microstructure and were mechanically stable after vacuum annealing. © 2019 Elsevier B.V.
Filiaciones:
Bahrami, Amin:
Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Ciudad Universitaria04510, Mexico
Institute for Metallic Materials, Leibniz-Institute for Solid State and Materials Research Dresden, Helmholtz-Str. 20, Dresden, D-01069, Germany
Univ Nacl Autonoma Mexico, Inst Invest Mat, Ciudad Univ, Mexico City 04510, DF, Mexico
Leibniz Inst Solid State & Mat Res Dresden, Inst Met Mat, Helmholtz Str 20, D-01069 Dresden, Germany
Onofre Carrasco C.F.:
Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Ciudad Universitaria04510, Mexico
Cardona, Arturo Delgado:
Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Ciudad Universitaria04510, Mexico
Univ Nacl Autonoma Mexico, Inst Invest Mat, Ciudad Univ, Mexico City 04510, DF, Mexico
Huminiuc, Teodor:
nCATS, University of Southampton, Highfield, Southampton, SO17 1BJ, United Kingdom
Univ Southampton, nCATS, Southampton SO17 1BJ, Hants, England
Polcar, Tomas:
nCATS, University of Southampton, Highfield, Southampton, SO17 1BJ, United Kingdom
Univ Southampton, nCATS, Southampton SO17 1BJ, Hants, England
Rodil, Sandra E.:
Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Ciudad Universitaria04510, Mexico
Univ Nacl Autonoma Mexico, Inst Invest Mat, Ciudad Univ, Mexico City 04510, DF, Mexico
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