Pd_(82)Si_(18)非晶合金等温晶化动力学研究  

Research on Isothermal Crystallization Kinetics of Pd_(82)Si_(18) Amorphous Alloy

作　　者：张萌娟 唐成颖[1] 曾沫 

机构地区：[1]桂林电子科技大学材料科学与工程学院,广西桂林541004

出　　处：《热加工工艺》2016年第20期89-92,96,共5页Hot Working Technology

基　　金：国家自然科学基金资助项目(51261005);中德联合研究项目项目(GZ1002)

摘　　要：采用高速单辊旋淬法制备了Pd_(82)Si_(18)非晶薄带,通过X射线衍射仪、透射电镜表征了非晶合金的物相结构,利用差示扫描量热仪(DSC)结合Johnson-Mehl-Avrami(JMA)模型对非晶合金的等温晶化动力学进行研究,使用Arrhenius公式计算了描述晶化过程不同阶段的局域激活能。结果表明:晶化过程的Avrami指数n值为2.5,表明该等温晶化过程主要依靠一维界面长大;晶化激活能随着晶化分数的变化而变化,晶化激活能E_c(α)范围为333.8 kJ/mol<E_c(α)<343.8 kJ/mol,较大的晶化激活能表明Pd_(82)Si_(18)非晶合金具有良好的热稳定性。Pd82Si18 amorphous ribbon was prepared by high speed single roller spinning quenching method. X-ray diffractiotl （XRD） and transmission electronic microscopy （TEM） were applied to characterize the phase structure. The isothermal crystallization kinetics of Pd82Si18 amorphous alloy was investigated by differential scanning calorimeter （DSC） coupled with Johnson-Mehl-Avrami （JMA） model. The local activation energy of the crystallization in different stages was calculated by Arrhenins function. The results show that the Avrami exponent is 2.5 in crystallization process, which indicates that the crystallization process is governed by one-dimensional interface growth. The activation energy of crystallization changes with crystallization fraction. The activation energy of crystallization is in the range from 333.8 to 343.8 kJ/mol. Larger crystallization activation energy shows that Pd82Si18 amorphous alloy has good thermal stability.

关 键 词：PD 基非晶合金 等温晶化 晶化动力学 晶化激活能 

分 类 号：TG139.8[一般工业技术—材料科学与工程]