The thermal behavior of atoms in ultrafine-grained Ni processed by severe plastic deformation

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	The thermal behavior of atoms in ultrafine-grained Ni processed by severe plastic deformation
	K. Zhang; I. V. Alexandrov; R. Z. Valiev; K. Lu
	1998
发表期刊	Journal of Applied Physics
ISSN	0021-8979
卷号	84 期号:4 页码:1924-1927
摘要	X-ray diffraction investigations in a temperature range from 85 to 295 K were performed on an ultrafine-grained (UFG) Ni sample processed by severe plastic deformation. A significantly enhanced thermal expansion coefficient of 3.75x10(-5) K-1 was observed in the UFG Ni sample, which is three times higher than in the conventional coarse-grained Ni polycrystal. The Debye-Waller parameter and its temperature-dependent and temperature-independent components are revealed to be larger in the UFG Ni sample. The obtained Debye temperature in the UFG Ni sample is decreased by 22%. The altered thermal properties in the UFG Ni sample are attributed to the nonequilibrium dislocations that disturb grain boundaries leading to large atomic displacements near interfaces. (C) 1998 American Institute of Physics. [S0021-8979(98)08416-3]
部门归属	acad sinica, inst met res, state key lab rsa, shenyang 110015, peoples r china. ufa state aviat tech univ, inst phys & adv mat, ufa 450000, russia.;zhang, k (reprint author), univ hamburg, inst appl phys, jungiusstr 11, d-20355 hamburg, germany
关键词	X-ray-diffraction Submicrocrystalline Structure Copper
URL	查看原文
WOS记录号	WOS:000075257700024
引用统计	被引频次：30[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/37869
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	K. Zhang,I. V. Alexandrov,R. Z. Valiev,et al. The thermal behavior of atoms in ultrafine-grained Ni processed by severe plastic deformation[J]. Journal of Applied Physics,1998,84(4):1924-1927.
APA	K. Zhang,I. V. Alexandrov,R. Z. Valiev,&K. Lu.(1998).The thermal behavior of atoms in ultrafine-grained Ni processed by severe plastic deformation.Journal of Applied Physics,84(4),1924-1927.
MLA	K. Zhang,et al."The thermal behavior of atoms in ultrafine-grained Ni processed by severe plastic deformation".Journal of Applied Physics 84.4(1998):1924-1927.