Abstract
A family of Fe70(ZrNbTi)10B20 bulk metallic glasses (BMGs) were developed through the stepwise substitution of Nb and Ti for non-major solvent element Zr. The glass-forming ability (GFA), magnetic and mechanical properties of Fe70Zr10B20, Fe70Zr6Nb4B20 and Fe70Zr4Nb4Ti2B20 metallic glasses were studied to explore the influence of minor similar solvent element substitution. With the substitution of 4 at.% Nb for Zr, the critical diameter of Fe70Zr6Nb4B20 BMG increases to 1 mm while the saturation magnetization (Ms) decreases slightly. After the further substitution of 2 at.% Ti, the resulting BMG exhibits higher GFA and lower Ms. The enhanced GFA and decreased Ms are attributed to the more solute-solute avoidance and smaller average magnetic moments of the resulting bulk metallic glass, respectively. In addition, the analysis of charge density distribution reveals the origin of high fracture strength and microhardness of Fe70Zr4Nb4Ti2B20 BMG.
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