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Revealing the deformation mechanisms of nanograins in gradient nanostructured Cu and CuAl alloys under tension
Wang, J. J.; Tao, N. R.; Lu, K.
2019-11-01
Source PublicationACTA MATERIALIA
ISSN1359-6454
Volume180Pages:231-242
AbstractA 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.
KeywordGradient nanostructure Tensile Grain coarsening Deformation twinning CuAl alloys
Indexed BySCI
Language英语
WOS IDWOS:000495519100023
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/80662
Collection中国科学院金属研究所
Recommended Citation
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.
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