Revealing the deformation mechanisms of nanograins in gradient nanostructured Cu and CuAl alloys under tension

doi:10.1016/j.actamat.2019.09.021

CORC > 金属研究所 > 中国科学院金属研究所

	Revealing the deformation mechanisms of nanograins in gradient nanostructured Cu and CuAl alloys under tension
	Wang, J. J.1,2; Tao, N. R.1; Lu, K.1
刊名	ACTA MATERIALIA
	2019-11-01
卷号	180 页码:231-242
关键词	Gradient nanostructure Tensile Grain coarsening Deformation twinning CuAl alloys
ISSN号	1359-6454
DOI	10.1016/j.actamat.2019.09.021
通讯作者	Tao, N. R.(nrtao@imr.ac.cn)
英文摘要	A gradient nanostructured (GNS) surface layer was induced on coarse-grained (CG) Cu and CuAl alloys by means of surface mechanical grinding treatment. The GNS/CG Cu-4.5Al sample subjected to tensile tests yields at a higher strength and fails at a higher uniform elongation (similar to 42%) in comparison with the GNS/CG Cu and Cu-2.2Al samples. The microstructures of the GNS/CG samples before and after tension at different strains were systematically investigated by transmission electron microscope. It is revealed that grain coarsening dominates the plastic deformation of nanograins in the GNS/CG Cu sample while the propensity of deformation twinning in nanograins increases in the GNS/CG CuAl samples. The experimental results suggested a transition of deformation mechanism of nanograins from grain coarsening to the partial dislocation associated deformation twinning in the GNS/CG Cu and CuAl alloys with increasing Al solute concentration. The obvious activation of deformation twinning accommodates the large tensile plasticity of the surface nanograins in the GNS/CG Cu-4.5Al sample. This work demonstrated that the partial dislocation associated deformation twinning is an effective deformation mechanism to retard the strain localization and to improve the tensile ductility of nanograins. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
资助项目	National Natural Science Foundation of China[51771196] ; National Key R&D Program of China[2017YFA0204401] ; National Key R&D Program of China[2017YFA0204402] ; Key Research Program of Frontier Science, Chinese Academy of Sciences
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000495519100023
资助机构	National Natural Science Foundation of China ; National Key R&D Program of China ; Key Research Program of Frontier Science, Chinese Academy of Sciences
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/136854]
专题	金属研究所_中国科学院金属研究所
通讯作者	Tao, N. R.
作者单位	1.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Liaoning, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Wang, J. J.,Tao, N. R.,Lu, K.. Revealing the deformation mechanisms of nanograins in gradient nanostructured Cu and CuAl alloys under tension[J]. ACTA MATERIALIA,2019,180:231-242.
APA	Wang, J. J.,Tao, N. R.,&Lu, K..(2019).Revealing the deformation mechanisms of nanograins in gradient nanostructured Cu and CuAl alloys under tension.ACTA MATERIALIA,180,231-242.
MLA	Wang, J. J.,et al."Revealing the deformation mechanisms of nanograins in gradient nanostructured Cu and CuAl alloys under tension".ACTA MATERIALIA 180(2019):231-242.