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Cyclic deformation behavior and dislocation structures of [001] copper single crystals .1. Cyclic stress-strain response and surface feature
Gong, B; Wang, ZR; Wang, ZG
1997-04-01
Source PublicationACTA MATERIALIA
ISSN1359-6454
Volume45Issue:4Pages:1365-1377
AbstractCyclic deformation behavior of [001] copper single crystals was investigated in symmetrical pull-push Fatigue tests at the ambient temperature and with constant plastic shear strain amplitudes (gamma(pl)) in the range of 1.0 x 10(-4) to 3.0 x 10(-3). The formation and development of surface slip bands (SBs) were examined in situ by a light microscope. A rapid initial hardening stage followed by a pronounced overshooting or significant softening was found with the crystals tested at gamma(pl) greater than or equal to 4.8 x 10(-4). The cyclic stress-strain curve of [001] crystals does not show any plateau behavior. instead it follows, if corrected with the Taylor factor, the power law function for copper polycrystals. The fatigue limit, defined as the critical strain amplitude below which SBs do not form, was found to be approximately 1.7 x 10(-4), a value much higher than that for single slip oriented crystals, but very close to that for polycrystals modified by the Taylor factor. In situ observation revealed that the primary SBs appeared at the very beginning of cyclic deformation and frequently they were not persistent. The secondary (critical) SBs usually formed at the overshooting stage after rapid hardening. Deformation bands with the characteristics of kink bands were detected in the final stage of the cyclic deformation. Analysis indicated that the rapid initial cyclic hardening is caused by the formation of Lomer-Cottrell locks, while the overshooting/softening behavior is related to the operation of secondary slip or the formation of dislocation labyrinth structure. The preferred combination of primary and critical slip during cyclic deformation is also discussed in terms of dislocation reactions. (C) 1997 Acta Metallurgica Inc.
Indexed BySCI
Language英语
WOS Research AreaMaterials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS IDWOS:A1997WR62600005
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Cited Times:65[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/126875
Collection中国科学院金属研究所
Affiliation1.UNIV TORONTO,DEPT MAT SCI & MET,TORONTO,ON,CANADA
2.CHINESE ACAD SCI,MED RES INST,STATE KEY LAB FATIGUE & FRACTURE MAT,SHENYANG,PEOPLES R CHINA
Recommended Citation
GB/T 7714
Gong, B,Wang, ZR,Wang, ZG. Cyclic deformation behavior and dislocation structures of [001] copper single crystals .1. Cyclic stress-strain response and surface feature[J]. ACTA MATERIALIA,1997,45(4):1365-1377.
APA Gong, B,Wang, ZR,&Wang, ZG.(1997).Cyclic deformation behavior and dislocation structures of [001] copper single crystals .1. Cyclic stress-strain response and surface feature.ACTA MATERIALIA,45(4),1365-1377.
MLA Gong, B,et al."Cyclic deformation behavior and dislocation structures of [001] copper single crystals .1. Cyclic stress-strain response and surface feature".ACTA MATERIALIA 45.4(1997):1365-1377.
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