Size effects of nano-spaced basal stacking faults on the strength and deformation mechanisms of nanocrystalline pure hcp metals
文献类型：期刊论文
| 作者 | Wang W(王雯) ; Jiang P(姜萍); Yuan FP(袁福平); Wu XL(武晓雷)
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| 刊名 | PHILOSOPHICAL MAGAZINE
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| 出版日期 | 2018-01-31 |
| 卷号 | 98期号:13页码:1186-1203 |
| ISSN号 | 1478-6435 |
| 关键词 | Mg alloys molecular dynamics nanocrystals deformation twinning strengthening mechanisms stacking faults |
| DOI | 10.1080/14786435.2018.1432908 |
| 英文摘要 | The size effects of nano-spaced basal stacking faults (SFs) on the tensile strength and deformation mechanisms of nanocrystalline pure cobalt and magnesium have been investigated by a series of large-scale 2D columnar and 3D molecular dynamics simulations. Unlike the strengthening effect of basal SFs on Mg alloys, the nano-spaced basal SFs are observed to have no strengthening effect on the nanocrystalline pure cobalt and magnesium from MD simulations. These observations could be attributed to the following two reasons: (i) Lots of new basal SFs are formed before (for cobalt) or simultaneously with (for magnesium) the other deformation mechanisms (i.e. the formation of twins and the < c+a > edge dislocations) during the tensile deformation; (ii) In hcp alloys, the segregation of alloy elements and impurities at typical interfaces, such as SFs, can stablilise them for enhancing the interactions with dislocation and thus elevating the strength. Without such segregation in pure hcp metals, the < c+a > edge dislocations can cut through the basal SFs although the interactions between the < c+a > dislocations and the pre-existing SFs/newly formed SFs are observed. The nano-spaced basal SFs are also found to have no restriction effect on the formation of deformation twins. |
| 分类号 | 二类 |
| URL标识 | 查看原文 |
| WOS关键词 | MOLECULAR-DYNAMICS SIMULATION ; SEVERE PLASTIC-DEFORMATION ; TENSILE DUCTILITY ; ZN ALLOY ; COBALT ; MG ; SEGREGATION ; MAXIMUM ; COPPER ; TWINS |
| WOS研究方向 | Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering ; Physics, Applied ; Physics, Condensed Matter |
| 语种 | 英语 |
| WOS记录号 | WOS:000428305900004 |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/77957]  |
| 专题 | 力学研究所_非线性力学国家重点实验室 |
| 作者单位 | 1.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing, Peoples R China 2.Univ Chinese Acad Sci, Sch Engn Sci, Beijing, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wang W,Jiang P,Yuan FP,et al. Size effects of nano-spaced basal stacking faults on the strength and deformation mechanisms of nanocrystalline pure hcp metals[J]. PHILOSOPHICAL MAGAZINE,2018,98(13):1186-1203. |
| APA | 王雯,姜萍,袁福平,&武晓雷.(2018).Size effects of nano-spaced basal stacking faults on the strength and deformation mechanisms of nanocrystalline pure hcp metals.PHILOSOPHICAL MAGAZINE,98(13),1186-1203. |
| MLA | 王雯,et al."Size effects of nano-spaced basal stacking faults on the strength and deformation mechanisms of nanocrystalline pure hcp metals".PHILOSOPHICAL MAGAZINE 98.13(2018):1186-1203. |
入库方式： OAI收割
来源：力学研究所
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