Quantification of the microstructures of high purity nickel subjected to dynamic plastic deformation

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	Quantification of the microstructures of high purity nickel subjected to dynamic plastic deformation
	Z. P. Luo ; H. W. Zhang ; N. Hansen ; K. Lu
刊名	Acta Materialia
	2012
卷号	60 期号:3 页码:1322-1333
关键词	Quantification Nickel Dynamic plastic deformation Strain rate Convergent beam electron diffraction mechanical-properties deformed metals large strains shear bands fcc metals evolution disorientations recrystallization parameters density
ISSN号	1359-6454
中文摘要	A quantitative microstructural analysis is presented for pure polycrystalline nickel processed by means of dynamic plastic deformation at high strain rates (10(2)-10(3) s(-1)) to strains from 0.3 to 2.9. This analysis covers a number of structural parameters, such as the spacing between and the misorientation angle across dislocation boundaries and high angle boundaries. These boundaries subdivide the structure on a finer and finer scale towards saturation at the highest strain. The structural evolution follows a hierarchical pattern from the formation of cells and cell blocks to a characteristic lamellar structure, which is similar to that observed in metals deformed at a low strain rate by conventional deformation processes. However, at a constant strain the increase in strain rate increases the dislocation density and reduces the distance between deformation-induced dislocation boundaries and high angle boundaries. Shear bands and twins have not been observed. In order to underpin the structural analysis, the mechanical properties as a function of strain have been determined by tensile and hardness tests. The flow stress is 850 MPa, showing that high strain rate deformation has potential as a method to produce strong nanostructured metals by imposing only a moderate strain. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
原文出处	://WOS:000301157900055
公开日期	2013-02-05
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/60146]
专题	金属研究所_中国科学院金属研究所
推荐引用方式 GB/T 7714	Z. P. Luo,H. W. Zhang,N. Hansen,et al. Quantification of the microstructures of high purity nickel subjected to dynamic plastic deformation[J]. Acta Materialia,2012,60(3):1322-1333.
APA	Z. P. Luo,H. W. Zhang,N. Hansen,&K. Lu.(2012).Quantification of the microstructures of high purity nickel subjected to dynamic plastic deformation.Acta Materialia,60(3),1322-1333.
MLA	Z. P. Luo,et al."Quantification of the microstructures of high purity nickel subjected to dynamic plastic deformation".Acta Materialia 60.3(2012):1322-1333.