The evaluation parameters for glass-forming ability in Ti–Cu system metallic glasses

• We found that the onset temperature of the second exothermic peak (Tx2) is an important temperature reflecting the stability of the supercooled liquid.
• Parameters for evaluating the glass-forming ability(GFA) in Ti–Cu system metallic glasses were investigated.
• Ti45Cu50Zr5showed two exothermic peaks on DSC curve, and maintained its halo peak when the sample was annealed at first exothermic peak.
• The GFA of Ti–Cu system metallic glasses are expressed well by parameters containing Tx2.

Parameters for evaluating the glass-forming ability (GFA) in Ti–Cu system metallic glasses were considered by investigating the effect of additional elements (Fe, Co, Ni, Si, Zr, Cr) on structural changes and onset temperatures associated with each exothermic peak on heating. The differential scanning calorimetry curves of Ti–Cu system metallic glasses (added Ni, Cr, Zr) exhibited two exothermic peaks. Moreover, the sample containing Zr maintained its halo peak when the sample was annealed at first exothermic peak. The results indicate that the onset temperature of the second exothermic peak (Tx2) is an important temperature reflecting the resistance of the supercooled liquid to crystallization. The GFA of Ti–Cu system metallic glasses are expressed well by parameters containing Tx2.