The Linear Thermal Expansion of Bulk Nanocrystalline Ingot Iron from Liquid Nitrogen to 300 K

doi:10.1007/s11671-009-9441-4

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	The Linear Thermal Expansion of Bulk Nanocrystalline Ingot Iron from Liquid Nitrogen to 300 K
	Wang,SG 1; Mei,Y 2; Long,K 1; Zhang,ZD 1
通讯作者	Wang,SG(sgwang@imr.ac.cn)
	2009-09-17
发表期刊	Nanoscale Research Letters
ISSN	1556-276X
卷号	5 期号:1
摘要	AbstractThe linear thermal expansions (LTE) of bulk nanocrystalline ingot iron (BNII) at six directions on rolling plane and conventional polycrystalline ingot iron (CPII) at one direction were measured from liquid nitrogen temperature to 300 K. Although the volume fraction of grain boundary and residual strain of BNII are larger than those of CPII, LTE of BNII at the six measurement directions were less than those of CPII. This phenomenon could be explained with Morse potential function and the crystalline structure of metals. Our LTE results ruled out that the grain boundary and residual strain of BNII did much contribution to its thermal expansion. The higher interaction potential energy of atoms, the less partial derivative of interaction potential energy with respect to temperature T and the porosity free at the grain boundary of BNII resulted in less LTE in comparison with CPII from liquid nitrogen temperature to 300 K. The higher LTE of many bulk nanocrystalline materials resulted from the porosity at their grain boundaries. However, many authors attributed the higher LTE of many nanocrystalline metal materials to their higher volume fraction of grain boundaries.
关键词	Linear thermal expansion Bulk nanocrystallined materials Severe rolling technique
DOI	10.1007/s11671-009-9441-4
语种	英语
WOS记录号	BMC:10.1007/s11671-009-9441-4
出版者	Springer New York
引用统计
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/80426
通讯作者	Wang,SG
作者单位	1.Chinese Academy of Sciences; Shenyang National Laboratory for Materials Science, Institute of Metal Research, and International Centre for Materials Physics 2.Dalian Fisheries University; Institute of Sciences
推荐引用方式 GB/T 7714	Wang,SG,Mei,Y,Long,K,et al. The Linear Thermal Expansion of Bulk Nanocrystalline Ingot Iron from Liquid Nitrogen to 300 K[J]. Nanoscale Research Letters,2009,5(1).
APA	Wang,SG,Mei,Y,Long,K,&Zhang,ZD.(2009).The Linear Thermal Expansion of Bulk Nanocrystalline Ingot Iron from Liquid Nitrogen to 300 K.Nanoscale Research Letters,5(1).
MLA	Wang,SG,et al."The Linear Thermal Expansion of Bulk Nanocrystalline Ingot Iron from Liquid Nitrogen to 300 K".Nanoscale Research Letters 5.1(2009).