Effects of bond parameters on the widths of supercooled liquid regions of ferrous BMGs

Correlation is investigated between supercooled liquid regions (SLRs) Δ T x (= T x − T g, where T x is the onset crystallization temperature and T g the glass transition temperature) of ferrous bulk metallic glasses (BMGs) and three bond parameters, i.e. electronegativity, atomic size and valent electron. From the available experimental data in literatures, Δ T x has strong correlation with the bond parameters. A semi-empirical equation is established to elucidate the correlation between Δ T x and the three bond parameters. In detail, Δ T x increases obviously with the increase of the atomic size parameter ( δ), and electronegativity difference (Δ x) and the electron concentration. An ellipse arc with thickness derived from the equation is drawn to determine the range of BMG with large SLR.