Study of the ductility enhancement of 5A90 Al-Mg-Li alloy sheets with stress relaxation

doi:10.1080/14786435.2021.1971316

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	Study of the ductility enhancement of 5A90 Al-Mg-Li alloy sheets with stress relaxation
	Xia, Liangliang 1,2; Zhang, Shi-Hong 1; Xu, Yong 1; Chen, Shuaifeng 1; Abd El-Aty, Ali 3; Pokrovsky, Artur, I 4; Bakinovskaya, Alina A.4
刊名	PHILOSOPHICAL MAGAZINE
	2021-09-09
页码	24
关键词	Dislocations mechanical properties Al-Mg-Li alloy stress relaxation in-situ XRD EBSD
ISSN号	1478-6435
DOI	10.1080/14786435.2021.1971316
通讯作者	Xu, Yong(yxu@imr.ac.cn)
英文摘要	Stress 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.
资助项目	National 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研究方向	Materials Science ; Metallurgy & Metallurgical Engineering ; Physics
语种	英语
出版者	TAYLOR & FRANCIS LTD
WOS记录号	WOS:000695992000001
资助机构	National Natural Science Foundation of China ; Sichuan Science and Technology Program ; Sino-Belarus Inter-Governmental Science and Technology Cooperation project ; Youth Innovation Promotion Association CAS
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/166929]
专题	金属研究所_中国科学院金属研究所
通讯作者	Xu, Yong
作者单位	1.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
推荐引用方式 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.