(西北工业大学 凝固国家重点实验室，西安 710072)
摘 要: 利用差热(DSC)分析等方法研究Ni59Zr16Ti13Si3Sn2Nb7非晶合金的非等温晶化动力学。结果表明：Ni59Zr16- Ti13Si3Sn2Nb7非晶合金的结构弛豫激活能(Eg)、晶化过程的形核激活能(Ex)和长大激活能(Ep)分别为568、616和640 kJ/mol；Avrami指数n值为3.51±0.03，n值不随加热温度的变化而变化，说明该非晶合金的晶化方式是多晶型晶化。原子尺寸差异和正负混合焓共存是Ni基非晶合金具有较高的热稳定性的主要原因。
关键字: Ni59Zr16Ti13Si3Sn2Nb7；非晶合金；晶化动力学；激活能
（The State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China）
Abstract:The non-isothermal crystallization kinetics of Ni59Zr16Ti13Si3Sn2Nb7 amorphous ribbons was investigated by differential scanning calorimetry (DSC). The activation energies for the glass transition and crystallization at the onset, first peak crystallization temperatures are determined by means of Kissinger plots to be 568, 616 and 640 kJ/mol. The non-isothermal crystallization kinetics results show that the Avrami exponent n is 3.51±0.03, which do not vary with the heating temperature. This shows that the Ni59Zr16Ti13Si3Sn2Nb7 amorphous alloys crystallization process can be carried out by a bulk crystallization. Large atomic size difference and negative heats of mixing coexisting with positive heats of mixing increase the thermal stability of Ni-based amorphous alloys.
Key words: Ni59Zr16Ti13Si3Sn2Nb7; amorphous alloys; crystallization kinetics; activation energy
