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Microstructure and Mechanical Properties of Copper, Nickel and Ternary Alloys Cu-Ni-Zr Obtained by Mechanical Alloying and Hot Pressing

Published online by Cambridge University Press:  05 September 2017

C. Martínez ,
F. Briones ,
P. Rojas ,
S. Ordoñez ,
C. Aguilar  and
D. Guzmán
C. Martínez*
Affiliation:
Escuela de Diseño, Universidad Adolfo Ibáñez, Diagonal Las Torres2640, Santiago, Chile
F. Briones
Affiliation:
Departamento de Metalurgia, Universidad Técnica Federico Santa María, Av. España1680, Valparaíso, Chile
P. Rojas
Affiliation:
Escuela de Diseño, Universidad Adolfo Ibáñez, Diagonal Las Torres2640, Santiago, Chile
S. Ordoñez
Affiliation:
Departamento de Metalurgia, Universidad de Santiago de Chile, Av. Libertador Bernardo O`Higgins3363, Santiago de Chile.
C. Aguilar
Affiliation:
Departamento de Metalurgia, Universidad Técnica Federico Santa María, Av. España1680, Valparaíso, Chile
D. Guzmán
Affiliation:
Departamento de Metalurgia, Universidad de Atacama, Av. Copayapu 485, Copiapó, Chile
*
*Email: carola.martinezu@usach.cl
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Abstract

Elemental powders of Cu and Ni, binary alloys (Cu-Ni and Cu-Zr) and ternary alloy (Cu-Ni-Zr) obtained by mechanical alloying and uniaxial compaction hot microstructure and mechanical properties were investigated. The alloys studied were: pure Cu, pure Ni, binary alloys (Cu-Ni; Cu-Zr) and ternary alloys (Cu-Ni-Zr) under the same mechanical milling and hot pressing conditions. The samples were analyzed by X-ray diffraction (XRD), scanning electron microscope (SEM); the mechanical properties were studied by compression tests and hardness in Vickers scale (HV0.5) on polished surfaces at room temperature. According to XRD results, hot pressing process crystallite size increase and microstrain decreases in the compact samples due to the release of crystalline defects. The compacted samples have porosity of approximately 20%. The milling powder samples have a higher hardness than the unmilled samples, this because during milling crystal defects are incorporated together with the microstructural refinement. Ternary alloy is the one with the highest hardness of all systems studied, reaching 689 HV0.5. In compression tests determined a strain 5 %, Zr-containing samples become more fragile presenting the lowest values of compressive strength. In contrast, samples of Ni and Cu-Ni binary alloy are more resistant to compression.

Keywords

AlloyMechanical alloyingMicrostructure
Type
Articles
Information
MRS Advances , Volume 2 , Issue 50: International Materials Research Congress XXV , 2017 , pp. 2831 - 2836
Copyright
Copyright © Materials Research Society 2017 

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