W_(17.9)Ni_(65.6)B_(13.5)V_3非晶合金的非等温晶化动力学  

Non-isothermal Crystallization Kinetics of W_(17.9)Ni_(65.6)B_(13.5)V_3 Amorphous Alloy

作　　者：刘文胜[1] 吴亚瑜[1] 马运柱[1] 张佳佳[1] 叶晓珊[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,湖南长沙410083

出　　处：《稀有金属材料与工程》2017年第10期3048-3052,共5页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(50774098)

摘　　要：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。W_（17.9）Ni_（65.6）B_（13.5）V_3（at%） amorphous alloy was prepared by a melt spinning method. X-ray diffraction and differential scanning calorimeter were applied to investigate non-isothermal crystallization kinetics of the amorphous alloy. Results show that as the heating rate increases, the glass transition temperature, the initial crystallization temperature and the peak temperature grow up, suggesting that the amorphous alloy has obvious crystallization kinetics. The crystallization activation energy of W_（17.9）Ni_（65.6）B_（13.5）V_3 amorphous alloy calculated by Kissinger equations and Ozawa equation is 456.9 and 471.1 kJ/mol, respectively, indicating that the amorphous alloy possesses high thermal stability. The values of crystallization activation energy Ex is smaller than grain growth activation energy Ep calculated by Kissinger equation and Ozawa equation, which shows that nucleation process is easier than the grain growth process, indicating that ultrafine grains structure could be easily obtained under certain conditions.

关 键 词：W-Ni基非晶 非晶薄带 晶化动力学 激活能 

分 类 号：TG139.8[一般工业技术—材料科学与工程] TG146.411[金属学及工艺—合金]