Effects of Zr on the amorphization of Cu-Ni-Zr alloys prepared by mechanical alloying

JOURNAL OF ALLOYS AND COMPOUNDS

卷:765

Article

Martinez, C.¹  Aguilar, C.²  Briones, E.³  Guzman, D.⁴  Zelaya, E.⁵  Troncoso, L.⁶  Roja, P. A.⁷ 

[1] Pontificia Univ Catolica Valparaiso, Inst Quim, Lab Corros, Av Univ 330, Valparaiso 3100000, Chile

[2] Univ Tecn Federico Santa Maria, Dept Ingn Met & Mat, Av Espana 1680, Valparaiso 2390123, Chile

[3] Pontificia Univ Catolica Valparaiso, Escuela Ingn Mecan, Carrera 01567, Quilpue 2430120, Chile

[4] Univ Atacama, Dept Met, Av Copayapu 485, Copiapo 1531772, Chile

[5] Ctr Atom Bariloche CNEA, Av E Bustillo 9500, RA-8400 San Carlos De Bariloche, Rio Negro, Argentina

[6] Univ Austral Chile, Inst Mat & Proc Termomecan, Gen Lagos 2086, Valdivia 5111187, Chile

[7] Univ Adolfo Ibanez, Escuela Diseno, Diagonal Torres 2640, Santiago 7941169, Chile

关键词: Copper based alloys;    Amorphous alloys;    Mechanical alloying;    X-ray diffraction;    Transmission electron microscopy;    Thermodynamic analysis;   

DOI  :  10.1016/j.jallcom.2018.04.259

来源: Elsevier

【 摘 要 】

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 (alpha-phase); in contrast, the Cu-33Ni-7Zr alloy showed an alpha-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. (C) 2018 Published by Elsevier B.V.

【 授权许可】

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