Mechanical Properties of an Amorphous or Partially Crystallized Zirconium Based Metallic Glass
The effect of partial crystallization on the mechanical properties of a Zr based bulk metallic glass (Vitreloy 1) is investigated. Viscoelastic properties are studied by mechanical spectroscopy in large frequency and temperature ranges, both below or above the glass transition temperature (Tg), whereas viscoplastic properties are investigated by compression tests . To study the interaction between crystallization and mechanical properties at high temperature, nanocomposites are produced thanks to appropriate heat treatments. Formation of nanocrystalline particles induces an increase of the storage elastic modulus, especially in the glass transition range, where this modulus is very low in the amorphous material. It also results in a decrease of the loss elastic modulus, corresponding to a decrease of the atomic mobility. Finally, partial crystallization induces very large hardening revealed by the compression tests but the hardening extent depends strongly on the applied strain rate.
T. Chandra, K. Tsuzaki, M. Militzer , C. Ravindran
J. M. Pelletier et al., "Mechanical Properties of an Amorphous or Partially Crystallized Zirconium Based Metallic Glass", Materials Science Forum, Vols. 539-543, pp. 2036-2042, 2007