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Self-diffusion in Zr55Al10Ni10Cu25 and Pd40Cu30Ni10P20 Bulk Metallic Glass

  • H. Nakajima (a1), T. Kojima (a1), K. Nonaka (a2), T. Zhang (a3), A. Inoue (a3) and N. Nishiyama (a4)...

Abstract

Self-diffusion coefficients of Ni in Zr55Al10Ni10Cu25and of Ni and Pd inPd40Cu30Ni10P20 bulk metallic glass below and above the glass transition temperature Tg have been measured with an ion-beam sputter-sectioning technique using the radioactive isotope 63Ni and 103Pd. The diffusion coefficients in the supercooled liquid region are much higher than those extrapolated from low temperature data in the amorphous region. The temperature dependence of the diffusion coefficients exhibits non-Arrhenius behaviour in the supercooled liquid phase. Such a deviation from the Arrhenius plots is interpreted by a cooperation of moving tracer atom with the surrounding atoms. The difference of the diffusion behaviour in between Zr-Al-Ni-Cu and Pd-Cu-Ni-P glasses is attributed to the different structural stability of both glasses.

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