Structural relaxation and crystallisation of bulk metallic glasses Zr_(41)Ti_(14)Cu_(12.5)Ni_(10-x)Be_(22.5)Fe_x (x = 0 or 2) studied by mechanical spectroscopy

摘要

The measurements of the internal friction and dynamic shear modulus as well as differential scanning calorimetry have been performed in order to investigate the structural relaxation and crystallization of Zr_(41)Ti_(41)Cu_(12.5)Ni_(10-x)Be_(22.5)Fe_x (x = 0 or 2) bulk metallic glasses. It is found that the glass transition is retarded and the thermal stability of supercooled liquid is increased by the Fe addition. The experimental results are well analyzed using a physical model, which can characterize atomic mobility and mechanical response of disordered condensed materials.