info:eu-repo/semantics/article
Effects of Zr on the amorphization of Cu-Ni-Zr alloys prepared by mechanical alloying
Fecha
2018-10-15Registro en:
Martínez, Carola; Aguilar, Claudio; Briones, Francisco; Guzmán, Danny; Zelaya, Maria Eugenia; et al.; Effects of Zr on the amorphization of Cu-Ni-Zr alloys prepared by mechanical alloying; Elsevier Science SA; Journal of Alloys and Compounds; 765; 15-10-2018; 771-781
0925-8388
CONICET Digital
CONICET
Autor
Martínez, Carola
Aguilar, Claudio
Briones, Francisco
Guzmán, Danny
Zelaya, Maria Eugenia
Troncoso, Loreto
Rojas, Paula
Resumen
This work presents the effects of high energy milling with different Ni and Zr ratios on the amorphization of ternary Cu-Ni-Zr alloys (initially, Cu-43Ni-7Zr, Cu-12Ni-31Zr, Cu-33Ni-7Zr, and Cu-12Ni-23Zr; and later, Cu-23Ni-15Zr and Cu-11Ni-7Zr). Microstructure was determined using X-Ray diffraction and electron microscopy. Results were compared to thermodynamic models. In the ternary alloys under study, the lattice parameter of the Cu-Ni solid solution was generally correlated to the amounts of nickel incorporated into the Cu lattice. However, longer milling times reduced that lattice parameter and facilitated Zr insertion into the solid solution. For example, after 5 h of milling time, microstructural analysis showed the formation of a solid solution with cubic structure in Cu-43Ni-7Zr. This pattern is consistent with the presence of a lattice parameter between that of Cu and Ni (α−phase); in contrast, the Cu-33Ni-7Zr alloy showed an α-phase and another similar to Zr. Results suggest that, as the amount of nickel increases, the ability to form an amorphous phase decreases. Additionally, experimental and thermodynamic data showed a solid-solution formation stage, followed by an amorphous phase formation stage that occurred as milling time and Zr content increased.
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