Tailoring Nano-crystallization in Zr50Ti4Y1Al10Cu25Ni7Co2Fe1 complex multicomponent bulk metallic glass by O doping

Abstract In this paper, O was added in Zr50Ti4Y1Al10Cu25Ni7Co2Fe1 complex multicomponent bulk metallic glass (CMBMG) with concentrations of 0.12 at.% and 0.45 at.%, and the microstructure, thermal stability and mechanical properties of these O-containing alloys were investigated in detail. It is found that, O element promotes the formation and growth of nanocrystals in the glassy matrix, and the structure of nanocrystalline phase changes from BCC to FCC with the increase in O content. Moreover, even at high Oxygen concentration, the alloy still shows excellent resistance to O-induced brittleness. This work is beneficial for better understanding the correlation between O and nanocrystal formation in CMBMGs, which provides a novel insight for further development of this series of alloys.