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Thickness-related synchronous increase in strength and ductility of ultrafine-grained pure aluminum sheets

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文摘 To explore the specimen size effect of mechanical behavior of ultrafine-grained(UFG) materials with different structures, UFG Al sheets processed by equal channel angular pressing(ECAP) were selected as target materials and the dependency of tensile behavior on sheet thickness(t) was systematically investigated. The strength and ductility of ECAPed UFG Al sheets were improved synchronously as t increased from 0.2 to 0.7 mm, and then no apparent change occurred when t reached to 0.7 and 1.0 mm. The corresponding microstructure evolved from dislocation networks in equiaxed grains into the walls and subgrains and finally into the dominated cells in elongated grains or subgrains. Meanwhile, dense shear lines(SLs) and shear bands(SBs) were clearly observed and microvoids and cracks were initiated along SBs with the increase of t. These observations indicated that the plastic deformation of UFG Al sheets was jointly controlled by shear banding, dislocation sliding, and grain-boundary sliding. Furthermore, the propagation of SBs became difficult as t increased. Finally, the obtained results were discussed and compared with those of annealed UFG Al and UFG Cu.
来源 International Journal of Minerals , Metallurgy and Materials,2019,26(11):1450-1456 【核心库】
DOI 10.1007/s12613-019-1839-0
关键词 ultrafine-grained pure Al ; specimen size effect ; strength ; ductility
地址

1. Northeastern University,Department of Materials Physics and Chemistry,School of Materials Science and Engineering, Key Laboratory for Anisotropy and Texture of Materials,Ministry of Education, Shenyang, 110819  

2. School of Materials Science and Engineering,Shenyang University of Technology, Shenyang, 110870

语种 英文
文献类型 研究性论文
ISSN 1674-4799
学科 金属学与金属工艺
基金 国家自然科学基金 ;  the Open Foundation of Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, Northeastern University, China
文献收藏号 CSCD:6618970

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引证文献 2 篇

1 Zhang Zhi Toward the development of Mg alloys with simultaneously improved strength and ductility by refining grain size via the deformation process International Journal of Minerals, Metallurgy and Materials,2021,28(1):30-45
CSCD被引 43 次

2 Wang Panjun Influence of grain refinement on the corrosion behavior of metallic materials: A review International Journal of Minerals, Metallurgy and Materials,2021,28(7):1112-1126
CSCD被引 19 次

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