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Study of the ductility enhancement of 5A90 Al-Mg-Li alloy sheets with stress relaxation
Xia, Liangliang1,2; Zhang, Shi-Hong1; Xu, Yong1; Chen, Shuaifeng1; Abd El-Aty, Ali3; Pokrovsky, Artur, I4; Bakinovskaya, Alina A.4
Corresponding AuthorXu, Yong(yxu@imr.ac.cn)
2021-09-09
Source PublicationPHILOSOPHICAL MAGAZINE
ISSN1478-6435
Pages24
AbstractStress relaxation tests were conducted on 5A90 (Al-Mg-Li) sheets using in-plane tension along various loading directions with different pre-strain levels to investigate the effects of stress relaxation on the mechanical properties. It is found that considerable ductility enhancement is achieved via the proposed stress relaxation approach. To investigate the mechanisms of ductility enhancement, in-situ X-ray diffractometer (XRD) and electron backscatter diffraction (EBSD) were conducted. The evolution of statistically stored dislocation (SSD) density and geometrically necessary dislocation (GND) density was investigated. A decrease in GND and SSD densities is observed, which is driven by internal stress homogenization and annihilation of dislocations after stress relaxation. Such decrease in dislocation density allows the rearrangement of GNDs and SSDs, and therefore improves the ductility with possible shifts of the strain localization during subsequent reloading. Meanwhile, the ductility enhancement is found to be strongly dependent on loading direction, which is related to the distinctive Schmid factor distribution. For instance, for loading direction with more 'soft grains' (i.e. crystal orientation with high Schmid factors), only a slight increase of ductility was observed owing to a lower possibility of shifting strain localization caused by much larger proportion of soft grain boundaries.
KeywordDislocations mechanical properties Al-Mg-Li alloy stress relaxation in-situ XRD EBSD
Funding OrganizationNational Natural Science Foundation of China ; Sichuan Science and Technology Program ; Sino-Belarus Inter-Governmental Science and Technology Cooperation project ; Youth Innovation Promotion Association CAS
DOI10.1080/14786435.2021.1971316
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[51875548] ; Sichuan Science and Technology Program[2019YFSY0050] ; Sino-Belarus Inter-Governmental Science and Technology Cooperation project[CB02-01] ; Youth Innovation Promotion Association CAS[2019195]
WOS Research AreaMaterials Science ; Metallurgy & Metallurgical Engineering ; Physics
WOS SubjectMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering ; Physics, Applied ; Physics, Condensed Matter
WOS IDWOS:000695992000001
PublisherTAYLOR & FRANCIS LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/166930
Collection中国科学院金属研究所
Corresponding AuthorXu, Yong
Affiliation1.Shi Changxu Innovat Ctr Adv Mat, Inst Met Res, Shenyang, Peoples R China
2.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei, Peoples R China
3.Nanjing Univ Aeronaut & Astronaut, Coll Mat Sci & Technol, Nanjing, Peoples R China
4.Phys Tech Inst, Natl Acad Sci Belarus, Minsk, BELARUS
Recommended Citation
GB/T 7714
Xia, Liangliang,Zhang, Shi-Hong,Xu, Yong,et al. Study of the ductility enhancement of 5A90 Al-Mg-Li alloy sheets with stress relaxation[J]. PHILOSOPHICAL MAGAZINE,2021:24.
APA Xia, Liangliang.,Zhang, Shi-Hong.,Xu, Yong.,Chen, Shuaifeng.,Abd El-Aty, Ali.,...&Bakinovskaya, Alina A..(2021).Study of the ductility enhancement of 5A90 Al-Mg-Li alloy sheets with stress relaxation.PHILOSOPHICAL MAGAZINE,24.
MLA Xia, Liangliang,et al."Study of the ductility enhancement of 5A90 Al-Mg-Li alloy sheets with stress relaxation".PHILOSOPHICAL MAGAZINE (2021):24.
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