Effect of tension on corrosive and thermal properties of Cu60Zr30Ti10 metallic glass

Abstract

Cu60Zr30Ti10 (at.%) glassy ribbon was prepared by melt spinning. The effect of the tension on its thermal and corrosive properties was investigated by differential scanning calorimetry and electrochemical polarization experiments, respectively. The glass transition temperature Tg, onset crystallization temperature Tx, and crystallization peak temperature Tp increase with increasing heating rate, but the increasing rate of these temperatures is larger for low heating rate (5–20Kmin−1) than for rapid heating rate (20–80Kmin−1) for the as-cast and tensile ribbons. The Tg for the tensile ribbon is smaller than that for the as-cast one in studied heating rates. The Tx and the Tp for the tensile ribbon are smaller than those for the a-cast ribbon when the heating rate is less than 80Kmin−1, while inversely when the heating rate reaches up to 80Kmin−1. There is a critical heating rate for the characteristic temperatures of the tensile ribbon surpassing those of the as-cast one. The heating rates are estimated to be 114.7Kmin−1 for Tg, 65.3Kmin−1 for Tx, and 64.9Kmin−1 for Tp, respectively. In addition, the activation energies for the glass transition and the crystallization decrease. On the other hand, the corrosion potential is larger in 0.5MH2SO4 than in 1M chloride-ion-containing solutions for the as-cast and tensile specimens. However, the corrosion current density is smaller in the former than in the latter for the tensile and as-cast specimens. After the tension, the corrosion potential sharply increases in 0.5MH2SO4 and decreases in 1M chloride-ion-containing solutions. The passive potential decreases and the pitting corrosion can be observed in 0.5MH2SO4. The potential for the sharp decrease of the current density decreases in 1MHCl, and maintains almost the same in 1MNaCl. The corroded surface micrographs in all studied solutions are remarkably changed. In addition, the difference of corrosive behavior in 0.5MH2SO4, 1MHCl, and 1MNaCl is also discussed.