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Strengthening of alloy AA6022-T4 by continuous bending under tension
Knezevic, Marko; Poulin, Camille M.; Zheng, Xiaodong; Zheng, Shijian; Beyerlein, Irene J.
2019-06-05
Source PublicationMATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
ISSN0921-5093
Volume758Pages:47-55
AbstractThis paper studies the evolution in strength of alloy AA6022-T4 sheets that have been pre-deformed by a continuous-bending-under-tension (CBT) process. Significant improvements in strength are observed only after a few CBT cycles. Less appreciable improvements in strength are observed with more CBT cycles and with every cycle the ductility reduces. These observations are rationalized by characterizing microstructural evolution using transmission electron microscopy and electron backscattered diffraction. It is found that evolution of texture and grain shape during CBT slightly differ from those in simple tension (ST). Also, the precipitates do not change their shape during CBT or ST. It is, therefore, concluded that these microstructural features have only a secondary effect on the strength behavior of the alloy. Consistent with earlier observations in the literature, we find that dislocation structures form within grains during monotonic ST and that they are disorganized and not as well defined. In contrast, cellular substructures are observed to form very early during CBT processing, even after the first cycle and to evolve from loose tangles of dislocations to well-defined walls during subsequent cycles. These dislocation patterns are found responsible for the observed behavior of the alloy. Therefore, the strength of the material is determined not only by the achieved effective strain level but also by achieved microstructure.
KeywordElongation-to-fracture Strength Dislocation structures Continuous-bending-under-tension AA6022-T4
Indexed BySCI
Language英语
WOS IDWOS:000471737800006
PublisherELSEVIER SCIENCE SA
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/81010
Collection中国科学院金属研究所
Recommended Citation
GB/T 7714
Knezevic, Marko,Poulin, Camille M.,Zheng, Xiaodong,et al. Strengthening of alloy AA6022-T4 by continuous bending under tension[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2019,758:47-55.
APA Knezevic, Marko,Poulin, Camille M.,Zheng, Xiaodong,Zheng, Shijian,&Beyerlein, Irene J..(2019).Strengthening of alloy AA6022-T4 by continuous bending under tension.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,758,47-55.
MLA Knezevic, Marko,et al."Strengthening of alloy AA6022-T4 by continuous bending under tension".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 758(2019):47-55.
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