Cyclic deformation behavior of non-isoaxial copper tricrystals and bicrystals
Jia, WP; Li, SX; Wang, ZG; Li, XW; Li, GY
Corresponding AuthorJia, WP()
Source PublicationACTA MATERIALIA
AbstractThe cyclic hardening and saturation behaviors of copper tricrystals and bicrystals were investigated in strain-controlled multiple step tests. The results show that, for the inclined grain boundary (GB) bicrystal with single slip components, the cyclic stress strain (CSS) curve exhibits a plateau or quasi-plateau region, while the CSS curve of tricrystals shows no plateau. Observations of surface morphologies indicated that owing to the strain incompatibility of three grains, at lower strain amplitude the triple junction (TJ) retards obviously the primary slip in grains and makes deformation near it smaller than that near the bicrystal GB, while at higher strain amplitude slip can be distributed near the TJ homogeneously. The probability of crack initiation at the same TJ is closely related to the loading direction. The saturation dislocation structures of tricrystal specimens under the strain amplitude of the last step were explored by the electron channeling contrast technique in SEM (ECC-SEM). Loop patches with persistent slip band (PSB) ladders embedded were found even in the TJ vicinity for all grains. Dislocation-free zones (DFZ) occurred in the vicinity of TJ and GB, and the difference in shapes between them is due to the difference in internal stress field. Misoriented cell structure and dislocation wall structure were found near the crack tip, and the formation of them is associated with the cooperative action of crack tip, GB, grain orientation and the applied strain amplitude. (C) 1999 Acta Metallurgica Inc. Published by Elsevier, Science Ltd. All rights reserved.
Indexed BySCI
WOS Research AreaMaterials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS IDWOS:000080811600015
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Cited Times:16[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorJia, WP
AffiliationChinese Acad Sci, Met Res Inst, State Key Lab Fatigue & Fracture Mat, Shenyang 110015, Peoples R China
Recommended Citation
GB/T 7714
Jia, WP,Li, SX,Wang, ZG,et al. Cyclic deformation behavior of non-isoaxial copper tricrystals and bicrystals[J]. ACTA MATERIALIA,1999,47(7):2165-2176.
APA Jia, WP,Li, SX,Wang, ZG,Li, XW,&Li, GY.(1999).Cyclic deformation behavior of non-isoaxial copper tricrystals and bicrystals.ACTA MATERIALIA,47(7),2165-2176.
MLA Jia, WP,et al."Cyclic deformation behavior of non-isoaxial copper tricrystals and bicrystals".ACTA MATERIALIA 47.7(1999):2165-2176.
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