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Chemical, microstructural and nanoindentation characterization in nanocrystalline Ni-Fe alloys: experimental and numerical methods.

Silvia Pomes

Chemical, microstructural and nanoindentation characterization in nanocrystalline Ni-Fe alloys: experimental and numerical methods.

Rel. Giovanni Maizza. Politecnico di Torino, Corso di laurea magistrale in Ingegneria Meccanica (Mechanical Engineering), 2019

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Abstract:

Research in nanocrystalline materials is growing due to their peculiar mechanical and functional properties. In this thesis, four samples of DC electrodeposited Ni-Fe alloys are considered, with different thickness and heat treatment history. A numerical simulation of nanoindentation test with Berkovich indenter has been implemented. Nanoindentation tests have been performed, both on top and cross section surfaces of the specimen, to investigate room temperature creep and understand the influence of sample thickness, peak load and hold time on such behaviour. Chemical and microstructural analysis, namely EDS, EBSD and EELS alongside SEM and TEM observation, have been carried out on as deposited and annealed samples, both with and without indentation mark, to gain knowledge on composition, orientation and possible deformation mechanisms in nanocrystalline Ni-Fe. Numerical simulation has been developed as a 3D model and specific geometries have been introduced in order to partialize the problem and save on computation cost.

Relators: Giovanni Maizza
Academic year: 2019/20
Publication type: Electronic
Number of Pages: 90
Subjects:
Corso di laurea: Corso di laurea magistrale in Ingegneria Meccanica (Mechanical Engineering)
Classe di laurea: New organization > Master science > LM-33 - MECHANICAL ENGINEERING
Ente in cotutela: NIMS National Institute for Materials Science (GIAPPONE)
Aziende collaboratrici: National Institute for Materials science
URI: http://webthesis.biblio.polito.it/id/eprint/12200
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