Synthesis and characterization of Ni-Mn-Ga alloys with addition of Cu
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Cita com:
hdl:2099.1/25165
Tutor / directorNaglič, Iztok
Realitzat a/ambUniverza v Ljubljani
Tipus de documentProjecte/Treball Final de Carrera
Data2013
Condicions d'accésAccés obert
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Reconeixement-NoComercial-SenseObraDerivada 3.0 Espanya
Abstract
Non-stoichiometric Heusler Ni-Mn-Ga based alloys with addition of up to 7,5 at.% of Cu were prepared. Homogenized alloys were characterized using polarized light microscopy, X-ray diffraction, differential scanning calorimetry and differential thermal analysis, vibrating sample magnetometer analysis and nanoindentation. Results of polarised light microscopy have revealed that all the alloys prepared, either in as-cast or homogenized state, have martensitic microstructure. X-ray diffraction has proved that tetragonal non-modulated martensite is present in all homogenised alloys. In a sample with the highest addition of copper MnO was also found. Thermal analysis revealed that the Curie temperatures decrease with e/a concentration and temperatures of martensitic transformation increases with e/a concentration. It was also found that saturation magnetization has decreased with increasing copper content for the samples with Curie temperature above room temperature (samples with copper concentration up to 2,77 at.%). Nanoindentation experiments suggest that hardness and elasticity modulus are increasing with increasing copper content.
ProvinençaAquest document conté originàriament altre material i/o programari no inclòs en aquest lloc web
TitulacióENGINYERIA DE MATERIALS (TITULACIÓ CONJUNTA AMB LA UB) (Pla 2003)
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