【摘要】 利用铜模吸铸法制备Zr46.3Cu43.3Al8.9Si1.5(at%)大块非晶合金,利用示差扫描量热(DSC)仪研究合金连续升温过程中的晶化行为,利用Kissinger方法计算其特征温度表观激活能,利用Doyle方法计算其局域激活能。结果表明,Zr46.3Cu43.3Al8.9Si1.5大块非晶合金具有良好的热稳定性。利用Kissinger方法计算得到其玻璃转变激活能Eg为395.4kJ/mol、晶化起始激活能Ex为343.2kJ/mol、晶化峰的激活能Ep为343.0kJ/mol。Doyle方法计算其局域激活能表明,其晶化过程中,激活能明显越过一能量势垒后,再呈现逐渐减小的趋势。更多还原

【Abstract】 Zr46.3Cu43.3Al8.9Si1.5(at%) bulk metallic glass was prepared by copper mould casting.The crystallization behavior of the alloy in continuous heating was investigated by differential canning calorimeter(DSC).The characteristic temperature apparent activation energy and the local activation energy were calculated by the Kissinger and Doyle equations,respectively.The results show that the activation energies of glass transition(Eg),crystallization(Ex) and peak crystallization(Ep) are 395.4 kJ/mol,343.2 kJ/mol and 343.0 kJ/mol,respectively.With the increase of the crystallized volume fraction,the crystallization activation energy increases to the largest energy barrier,and then decreases.Zr46.3Cu43.3Al8.9Si1.5 bulk metallic glass has desirable thermal stability.更多还原