ZrCuAlSi非晶合金的等温晶化动力学研究  

Isothermal crystallization kinetics of ZrCuAlSi bulk metallic glass

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作  者:张宝庆[1] 路新行 曹国华 刘坤 刘高鹏 屈盛官 ZHANG Baoqing1,LU Xinhang1,CAO Guohua2, LIU Kun2, LIU Gaopeng1,QU Shengguan1,3(1. School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454000 ,Henan , China ;2. School of Physics and Electronic In- formation Engineering ,Henan Polytechnic University, Jiaozuo 454000, Henan , China;3. School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, Guangdong , China)

机构地区:[1]河南理工大学材料科学与工程学院,河南焦作454000 [2]河南理工大学物理与电子信息学院,河南焦作454000 [3]华南理工大学机械与汽车工程学院,广东广州510640

出  处:《河南理工大学学报:自然科学版》2019年第1期142-146,共5页JOURNAL OF HENAN POLYTECHNIC UNIVERSITY

基  金:国家自然科学基金资助项目(51571085); 国家重点实验室开放课题项目(201207); 河南省科学技术研究重点项目(13B430019); 河南理工大学博士基金资助项目(B2012-007)

摘  要:采用示差扫描量热分析(DSC)研究了(Zr47Cu44Al9)(98.5)Si(1.5)非晶合金的等温晶化行为,利用Johnson-Mehl-Avrami(JMA)方程分析其等温晶化动力学。结果表明:随着等温温度升高,Avrami指数n逐渐增大,其数值由758 K时的1.05增大到773 K时的2.94,表明晶化过程主要受扩散控制的形核率随时间延续而减少的形核与长大支配。随着n变化,形核速率和长大方式发生改变。基于Arrhenius公式计算得到平均晶化激活能,为351 kJ/mol。晶化激活能与等温晶化体积分数密切相关。Isothermal crystallization behaviors of(Zr47Cu44Al9 )98.5Sil.5 BMG were studied by using differential scanning calorimeter (DSC). Meanwhile, isothermal crystallization kinetics was analyzed by Johnson-Mehl- Avrami(JMA) model. For(Zr47Cu44Al9 ) 98. 5Sil. 5 BMG, the Avrami exponent(n) ranged from 1.05 at 758 K to 2.94 at 773 K, indicating that crystallization mechanism in the alloy was governed by diffusion-controlled growth and the rate of nucleation decreases with time. With changes of n, the nucleation rate and growth pattern varied. On the basis of formula relation, the average value of activation energy was calculated to be 351 kJ/ mol. The apparent activation energy was strongly correlated with the fraction of isothermal crystallization.

关 键 词:ZrCu基非晶合金 热稳定性 等温晶化 JMA方程 激活能 

分 类 号:O756[理学—晶体学]

 

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