Strain-induced microstructure refinement in pure Al below 100 nm in size

doi:10.1016/j.actamat.2018.04.014

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	Strain-induced microstructure refinement in pure Al below 100 nm in size
	Xu, W ; Liu, XC ; Lu, K
刊名	ACTA MATERIALIA
	2018-06-15
卷号	152 页码:138-147
关键词	Nanolaminated structure Pure Al Low angle grain boundary Structural refinement Deformation parameters
ISSN号	1359-6454
DOI	10.1016/j.actamat.2018.04.014
英文摘要	The obtainable minimum structural size and microstructural characteristics of pure Al processed by three different deformation techniques, i.e., cold rolling (CR), dynamic plastic deformation (DPD) and surface mechanical grinding treatment (SMGT), have been investigated by means of transmission electron microscope and orientation mapping. A systematic evaluation of the effects of deformation parameters on structural refinement was performed, mainly focusing on the microstructures at high strains. In contrast to the submicro-scale laminated structures from CR at ambient temperature, which are mainly composed of high angle grain boundaries, deformation at low temperature and high strain rate facilitates formation of high density low angle grain boundaries (LAGBs) in DPD and SMGT samples. With a combination of low temperature, high strain rate and large strain gradient, nanolaminated (NL) structures with a size of only similar to 68 nm and a large fraction of LAGB5 (similar to 65%) was fabricated by means of SMGT. NL Al exhibits a record high Vickers hardness of 780 MPa, which has its origin in the capability of accommodating high density dislocations in the form of LAGB5. This study provides an alternative approach to design nano structures below the traditional refinement limit by generating more LAGBs. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
学科主题	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
语种	英语
WOS记录号	WOS:000436650600013
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/80151]
专题	金属研究所_中国科学院金属研究所
作者单位	1.[Xu, W. 2.Liu, X. C. 3.Lu, K.] Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Shenyang 110016, Peoples R China 4.[Xu, W.] Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Peoples R China
推荐引用方式 GB/T 7714	Xu, W,Liu, XC,Lu, K. Strain-induced microstructure refinement in pure Al below 100 nm in size[J]. ACTA MATERIALIA,2018,152:138-147.
APA	Xu, W,Liu, XC,&Lu, K.(2018).Strain-induced microstructure refinement in pure Al below 100 nm in size.ACTA MATERIALIA,152,138-147.
MLA	Xu, W,et al."Strain-induced microstructure refinement in pure Al below 100 nm in size".ACTA MATERIALIA 152(2018):138-147.