Temperature effect on elastic modulus of thin films and nanocrystals

CORC > 力学研究所 > 中国科学院力学研究所 > 非线性力学国家重点实验室

	Temperature effect on elastic modulus of thin films and nanocrystals
	Liang LH(梁立红); Li MZ(李美之); Qin FQ(秦福麒); Wei YG(魏悦广)
刊名	PHILOSOPHICAL MAGAZINE
	2013-02-01
通讯作者邮箱	lianglh@lnm.imech.ac.cn
卷号	93 期号:6 页码:574-583
关键词	cohesive energy nanocrystals thermal expansion size effect vibration entropy
ISSN号	1478-6435
通讯作者	Liang LH (reprint author), Chinese Acad Sci, Inst Mech, LNM, Beijing 100080, Peoples R China
产权排序	[Liang, Lihong;Li, Meizhi;Qin, Fuqi;Wei, Yueguang] Chinese Acad Sci, Inst Mech, LNM, Beijing 100190, Peoples R China
中文摘要	The stability of nanoscale devices is directly related to elasticity and the effect of temperature on the elasticity of thin films and nanocrystals. The elastic instability induced by rising temperature will cause the failure of integrated circuits and other microelectronic devices in service. The temperature effect on the elastic modulus of thin films and nanocrystals is unclear although the temperature dependence of the modulus of bulk materials has been studied for over half a century. In this paper, a theoretical model of the temperature-dependent elastic modulus of thin films and nanocrystals is developed based on the physical definition of the modulus by considering the size effect of the related cohesive energy and the thermal expansion coefficient. Moreover, the temperature effect on the modulus of Cu thin films is simulated by the molecular dynamics method. The results indicate that the elastic modulus decreases with increasing temperature and the rate of the modulus decrease increases with reducing thickness of thin films. The theoretical predictions based on the model are consistent with the results of computational simulations, semi-continuum calculations and the experimental measurements for Cu, Si thin films and Pd nanocrystals.
学科主题	固体力学
分类号	一类
收录类别	SCI ; EI
资助信息	National Basic Research Program of China [2012CB937500]; National Natural Science Foundation of China [10802088, 10832008, 11023001, 11021262, 10932011, 91116003]; the Opening Fund of LNM
原文出处	http://dx.doi.org/10.1080/14786435.2012.725950
语种	英语
WOS记录号	WOS:000322305500001
公开日期	2013-03-04
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/46938]
专题	力学研究所_非线性力学国家重点实验室
推荐引用方式 GB/T 7714	Liang LH,Li MZ,Qin FQ,et al. Temperature effect on elastic modulus of thin films and nanocrystals[J]. PHILOSOPHICAL MAGAZINE,2013,93(6):574-583.
APA	梁立红,李美之,秦福麒,&魏悦广.(2013).Temperature effect on elastic modulus of thin films and nanocrystals.PHILOSOPHICAL MAGAZINE,93(6),574-583.
MLA	梁立红,et al."Temperature effect on elastic modulus of thin films and nanocrystals".PHILOSOPHICAL MAGAZINE 93.6(2013):574-583.