Self-diffusion coefficients of Ni in Zr 55 Al 10 Ni 10 Cu 25 and of Ni and Pd in Pd 40 Cu 30 Ni 10 P 20 bulk metallic glass below and above the glass transition temperature T g have been measured with an ion-beam sputter-sectioning technique using the radioactive isotope 63 Ni and 103 Pd. 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.
|Journal||Materials Research Society Symposium - Proceedings|
|Publication status||Published - 2001 Jan 1|
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering