Abstract
Fe-based metallic glass is prone to crystallization at high temperature due to its thermodynamic instability, resulting in the loss of many excellent properties. In this work, we developed a new Fe-based bulk metallic glass with high Cr and W refractory elements. The results show that the glass transition temperature Tg reaches 880 K. The very high thermal stability can result in the formation of Cr-Cr bonds, W-W bonds, and (Cr,W)-(C,B) bonds with stronger bond energy in Fe-based bulk metallic glass. Moreover, FeCrWCBY bulk metallic glass exhibits good corrosion resistance in 3.5 % NaCl and aqua regia solutions. The self-corrosion current density of FeCrWCBY bulk metallic glass in NaCl solution is only 8.4 × 10–7 A/cm2, much lower than the result of Fe48Cr15Mo14C15B6Y2, known as amorphous steel. The high thermal stability and excellent corrosion resistance are decoded in details from atomic bonding properties and passivation film characteristics.
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