(西北工業(yè)大學(xué) 凝固國家重點實驗室，西安 710072)
摘 要: 利用差熱(DSC)分析等方法研究Ni59Zr16Ti13Si3Sn2Nb7非晶合金的非等溫晶化動力學(xué)。結(jié)果表明：Ni59Zr16- Ti13Si3Sn2Nb7非晶合金的結(jié)構(gòu)弛豫激活能(Eg)、晶化過程的形核激活能(Ex)和長大激活能(Ep)分別為568、616和640 kJ/mol；Avrami指數(shù)n值為3.51±0.03，n值不隨加熱溫度的變化而變化，說明該非晶合金的晶化方式是多晶型晶化。原子尺寸差異和正負(fù)混合焓共存是Ni基非晶合金具有較高的熱穩(wěn)定性的主要原因。
關(guān)鍵字: Ni59Zr16Ti13Si3Sn2Nb7；非晶合金；晶化動力學(xué)；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
