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

IMR OpenIR

	Quantification of the microstructures of high purity nickel subjected to dynamic plastic deformation
	Z. P. Luo; H. W. Zhang; N. Hansen; K. Lu
	2012
发表期刊	Acta Materialia
ISSN	1359-6454
卷号	60 期号:3 页码:1322-1333
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.
部门归属	[luo, z. p.; zhang, h. w.; lu, k.] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. [hansen, n.] tech univ denmark, riso natl lab sustainable energy, mat res div, danish chinese ctr nanomet, dk-4000 roskilde, denmark.;zhang, hw (reprint author), chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china.;hwzhang@imr.ac.cn
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
URL	查看原文
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/60146
专题	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.