Effect of Fe-C alloy additions on properties of Cu-Zr-Ti metallic glasses

摘要

The effect of Fe-C alloy additions on thermal, mechanical and corrosive properties of (Cu50Zr40Ti10)(1) (-x)(Fe-C)(x) (x = 0-2.20 at%) alloys were systematically investigated. The results show that the Fe and C additions can enhance glass transition temperature T-g and onset crystallization temperature T-x , but narrow supercooled liquid region Delta T-x . Work-hardening can be clearly observed for the Cu-based bulk metallic glasses (BMGs) containing Fe and C elements. The yield strength (sigma(y)), fracture strength (sigma(f)) and plastic strain (epsilon(p)) are drastically increased by Fe-C alloy additions. The corrosion potential E-c increases and the corrosion current density i(c) decreases with increasing Fe and C contents. The studied Cu-based BMGs exhibit unique and novel anodic polarization behavior characterized by current platforms plus current serrations. The current serrations are much larger for the Cu-based BMGs with 0 <= x <= 1.32 at% than for those with 1.76 <= x <= 2.20 at%. The corrosion surface images are changed from the pits to the passive films by Fe-C alloy additions. The corrosion behavior gradually transforms from the pitting corrosion to the self-passivization with increasing Fe and C contents. The corresponding mechanisms are also discussed. (C) 2019 Elsevier B.V. All rights reserved.