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采用单辊急冷法制备了W_(17.9)Ni_(65.6)B_(13.5)V_3(at%)非晶薄带,并用X射线衍射(XRD)和示差扫描量热分析仪(DSC)研究了该非晶合金的变温晶化动力学。结果表明:玻璃转变温度Tg、晶化起始温度Tx和晶化峰值温度Tp均随着升温速率的增加而提高,具有明显的动力学效应;利用Kissinger方程和Ozawa方程求出的W_(17.9)Ni_(65.6)B_(13.5)V_3非晶合金的晶化激活能Ex分别达456.9和471.1 kJ/mol,表明非晶合金具有较强的热稳定性;该晶化激活能Ex均小于晶体长大激活能Ep,表明形核过程比晶粒长大过程更容易,该非晶合金在一定条件下退火容易获得超细晶粒组织。
The amorphous W_ (17.9) Ni_ (65.6) B_ (13.5) V_3 (at%) ribbons were prepared by single roll rapid cooling method. The amorphous films were characterized by X-ray diffraction and differential scanning calorimetry (DSC) Crystallization kinetics of crystalline alloys. The results show that the glass transition temperature Tg, the crystallization onset temperature Tx and the crystallization peak temperature Tp both increase with the increase of heating rate, and have obvious kinetic effect. The W_ (17.9), which is obtained by Kissinger equation and Ozawa equation, The crystallization activation energies of the Ni_ (65.6) B_ (13.5) V_3 amorphous alloys were 456.9 and 471.1 kJ / mol, respectively, indicating that the amorphous alloys have strong thermal stability. The crystallization activation energy, Ex, Activation energy Ep, indicating that the nucleation process than the grain growth process easier, the amorphous alloy annealed under certain conditions easy to obtain ultra-fine grain structure.