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Thickness-related synchronous increase in strength and ductility of ultrafine-grained pure aluminum sheets
Yan Ying1; Zhang Guoqiang1; Chen Lijia1; Li Xiaowu1
2019
Source PublicationINTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS
ISSN1674-4799
Volume26Issue:11Pages:1450-1456
AbstractTo 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.
KeywordSTACKING-FAULT ENERGIES CU-MN ALLOYS DEFORMATION-BEHAVIOR SPECIMEN DIMENSIONS TENSILE BEHAVIOR MICRO-EXTRUSION STRAIN-RATE SIZE OPTIMIZATION TEMPERATURE ultrafine-grained pure Al specimen size effect strength ductility
Indexed ByCSCD
Language英语
Funding Project[National Natural Science Foundation of China] ; [Open Foundation of Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, Northeastern University, China]
CSCD IDCSCD:6618970
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Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/149421
Collection中国科学院金属研究所
Affiliation1.中国科学院金属研究所
2.上海市地震局
Recommended Citation
GB/T 7714
Yan Ying,Zhang Guoqiang,Chen Lijia,et al. Thickness-related synchronous increase in strength and ductility of ultrafine-grained pure aluminum sheets[J]. INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS,2019,26(11):1450-1456.
APA Yan Ying,Zhang Guoqiang,Chen Lijia,&Li Xiaowu.(2019).Thickness-related synchronous increase in strength and ductility of ultrafine-grained pure aluminum sheets.INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS,26(11),1450-1456.
MLA Yan Ying,et al."Thickness-related synchronous increase in strength and ductility of ultrafine-grained pure aluminum sheets".INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS 26.11(2019):1450-1456.
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