A thermodynamic approach to assess glass-forming ability of bulk metallic glasses

作者：Ji Xiu lin^*; Pan Ye

来源：Transactions of Nonferrous Metals Society of China, 2009, 19(5): 1271-1279.

DOI：10.1016/S1003-6326(08)60438-0

• glass-forming ability
• bulk metallic glass
• Gibbs free energy

According to the Gibbs free energy difference between liquid and crystal, a thermodynamic glass-forming ability(GFA) parameter related to characteristic temperatures, onset crystallization temperature(T(x)) and liquidus temperature(T(1)), was proposed for evaluating the GFA of bulk metallic glasses(BMGs). The new parameter defined as omega-T(1)(T(1)+T(x))/(T(x)(T(1)-T(x))) has good correlation with the critical section thickness(Z(c)) of Ca-Mg-Cu BMGs. Being verified by the glasses data, including oxide glasses, which were used to validate the former GFA parameters, omega is one of the most reliable and applicable GFA parameters among T(rg) (=T(g)/T(1)), gamma(=T(x)(T(1)+T(g))), alpha (=T(x)/T(1)), delta (=T(x)/(T(1)-T(g))), and so on. Finally, predicting GFA of Cu-Ag-Zr-Ti and Cu-Zr-Ti-Al BMGs using omega was compared with the experimental results.

• 出版日期2009-10
• 单位河海大学; 东南大学