摘要
The intrinsic thermodynamical factors that dominate the stability of nanocrystallines are investigated through the microcosmic process of grain growth.The results suggest that nanocrystallines grows at a certain temperature and the critical temperature is determined by the vacancy formation energy and diffusion activation energy of the nanocrystallines.Based on the hypothesis,a simple model is proposed to predict the size-dependent critical temperature of grain growth.Within this model,we investigate the thermal stability of nanocrystallines V and Au,compared with the results available.It is shown that the critical temperature decreases with decreasing size,showing an evident size effect.The research reveals that the thermal stability is dependent on the energetic state of the nanocrystallines and the mobility of the inner atoms.
作者
LU Yun-Bin
LIAO Shu-Zhi
PENG Hao-Jun
ZHANG Chun
ZHOU Hui-Ying
XIE Hao-Wen
OUYANG Yi-Fang
ZHANG Bang-Wei
吕云宾;廖树帜;彭好军;张淳;周慧英;谢浩文;欧阳义芳;张邦维(Key Laboratory of Low Dimensional Quantum Structures and Quantum Control of Ministry of Education,Department of Physics,Hunan Normal University,Changsha 410081;College of Mathematics and Physics,University of South China,Hengyang 421001;College of Mathematics and Computer Science,Hunan Normal University,Changsha 410081;Computer and Information Engineering School,Central South University of Forestry and Technology,Changsha 410004;Department of Physics,Guangxi University,Nanning 530004;Department of Applied Physics,Hunan University,Changsha 410082;International Centre for Materials Physics,Chinese Academy of Sciences,Shenyang 110015)
基金
by the Scientific Research Fund of Hunan Provincial Science and Technology Department(2009FJ3153).
