Mg-Zn-Ca-Ti非晶合金的非等温晶化动力学  

Non-isothermal Crystallization Kinetics of Mg-Zn-Ca-Ti Amorphous Alloy

作　　者：王伟[1] 陈可[1] 袁晓 余传贵 马广旭 WANG Wei CHEN Ke YUAN Xiao YU Chuangui MA Guangxu(College of Engineering, Nanjing Agricultural University, Nanjing 210031, China)

机构地区：[1]南京农业大学工学院,江苏南京210031

出　　处：《材料科学与工程学报》2017年第5期810-814,共5页Journal of Materials Science and Engineering

基　　金：2016中央高校基本科研业务费资助项目(69F/0601);南京农业大学科研启动基金资助项目(6Nu/rcqd10-03)

摘　　要：采用机械合金化的方法制备Mg_(48)Zn_(40)Ca_5Ti_7和Mg_(58)Zn_(30)Ca_5Ti_7非晶合金。利用X射线衍射仪(XRD)对其物相进行检测;结合差示扫描量热分析方法(DSC),对试样在不同升温速率下的非等温晶化进行研究。结果表明:Mg_(48)Zn_(40)Ca_5Ti_7和Mg_(58)Zn_(30)Ca_5Ti_7基本形成非晶;随着加热速率的增加,合金结晶峰均向更高温度的方向移动;用Kissinger、Ozawa和Augis-Bennett方法分别计算出Mg_(48)Zn_(40)Ca_5Ti_7和Mg_(58)Zn_(30)Ca_5Ti_7非晶合金的表观激活能Eα,发现Mg_(48)Zn_(40)Ca_5Ti_7非晶合金的Eα在250kJ·mol^(-1)~270kJ·mol^(-1)范围内,Mg_(58)Zn_(30)Ca_5Ti_7非晶合金的Eα在180kJ·mol^(-1)~200kJ·mol^(-1)范围内;Mg_(48)Zn_(40)Ca_5Ti_7非晶合金的Avrami指数n在不同升温速率下均在1左右;Mg_(58)Zn_(30)Ca_5Ti_7非晶合金的Avrami指数n随着升温速率的增加,由2.7减小到1.9。Mg48Zn40 Ca5 TiT and Mg58 Zn30 Ca5 Ti2 amorphous alloys were prepared by mechanical alloying （MA）. The non-isothermal crystallization of the amorphous alloys at different heating rates was studied by X- ray diffraction and differential scanning calorimeter. Results indicate that with the increase of heating rate, the crystallization peak of the alloy moves towards high temperature. The apparent activation energy （Eo） of Mg48 Zn40 Ca5 Ti7 and Mgs8 Zn30 Ca5 Ti7 amorphous alloys were respectively calculated using the methods of Kissinger, Ozawa and Augis-Bennett. It was then found that the apparent activation energy （Eo） of Mg48 Zn40 CasTb amorphous alloy is in the range of 250kJ·mol^-1 -270kJ·mol^-1 and the apparent activation energy（Eo） of Mg58 Zn30CasTi7 amorphous alloy is in the range of 180kJ·mol^-1 -200kJ·mol^-1. The Avrami exponent（n） Of Mg48 Zn40CasTi7 amorphous alloy is always around 1 at different heating rates, and the Avrami exponent（n） of Mgs8 Zn30CasTi7 amorphous alloy changes from 2.7 to 1.9 with increasing heating rate.

关 键 词：非晶合金 非等温 晶化激活能 Avrami指数n 

分 类 号：TG139.8[一般工业技术—材料科学与工程]