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| Accommodation of large plastic strains and defect accumulation in nanocrystalline Ni grains | |
Wu XL(武晓雷) ; Ma E; Wu, XL (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100080, Peoples R China.
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| Source Publication | Journal of Materials Research
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| 2007 | |
| Volume | 22Issue:8Pages:2241-2253 |
| ISSN | 0884-2914 |
| Abstract | A transmission electron microscopy (TEM) study has been carried out to uncover how dislocations and twins accommodate large plastic strains and accumulate in very small nanocrystalline Ni grains during low-temperature deformation. We illustrate dislocation patterns that suggest preferential deformation and nonuniform defect storage inside the nanocrystalline grain. Dislocations are present in individual and dipole configurations. Most dislocations are of the 60 degrees type and pile up on (111) slip planes. Various deformation responses, in the forms of dislocations and twinning, may simultaneously occur inside a nanocrystalline grain. Evidence for twin boundary migration has been obtained. The rearrangement and organization of dislocations, sometimes interacting with the twins, lead to the formation of subgrain boundaries, subdividing the nanograin into mosaic domain structures. The observation of strain (deformation)-induced refinement contrasts with the recently reported stress-assisted grain growth in nanocrystalline metals and has implications for understanding the stability and deformation behavior of these highly nonequilibrium materials. |
| Keyword | Rate Sensitivity Ultrafine Grain Thin-films In-situ Deformation Mechanisms Ultrahigh-strength Room-temperature Twin Boundaries Yield-stress Metals |
| DOI | 10.1557/JMR.2007.0279 |
| Indexed By | SCI ; EI |
| Language | 英语 |
| WOS ID | WOS:000248521500028 |
| WOS Keyword | RATE SENSITIVITY ; ULTRAFINE GRAIN ; THIN-FILMS ; IN-SITU ; DEFORMATION MECHANISMS ; ULTRAHIGH-STRENGTH ; ROOM-TEMPERATURE ; TWIN BOUNDARIES ; YIELD-STRESS ; METALS |
| WOS Research Area | Materials Science |
| WOS Subject | Materials Science, Multidisciplinary |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/33915 |
| Collection | 力学所知识产出(1956-2008) |
| Corresponding Author | Wu, XL (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100080, Peoples R China. |
| Recommended Citation GB/T 7714 | Wu XL,Ma E,Wu, XL . Accommodation of large plastic strains and defect accumulation in nanocrystalline Ni grains[J]. Journal of Materials Research,2007,22,8,:2241-2253. |
| APA | 武晓雷,Ma E,&Wu, XL .(2007).Accommodation of large plastic strains and defect accumulation in nanocrystalline Ni grains.Journal of Materials Research,22(8),2241-2253. |
| MLA | 武晓雷,et al."Accommodation of large plastic strains and defect accumulation in nanocrystalline Ni grains".Journal of Materials Research 22.8(2007):2241-2253. |
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