| Size effects of nano-spaced basal stacking faults on the strength and deformation mechanisms of nanocrystalline pure hcp metals | |
Wang W(王雯) ; Jiang P(姜萍); Yuan FP(袁福平); Wu XL(武晓雷)
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| Source Publication | PHILOSOPHICAL MAGAZINE
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| 2018-01-31 | |
| Volume | 98Issue:13Pages:1186-1203 |
| ISSN | 1478-6435 |
| Abstract | 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. |
| Keyword | Mg alloys molecular dynamics nanocrystals deformation twinning strengthening mechanisms stacking faults |
| DOI | 10.1080/14786435.2018.1432908 |
| URL | 查看原文 |
| Indexed By | SCI ; EI |
| Language | 英语 |
| WOS ID | WOS:000428305900004 |
| WOS Keyword | MOLECULAR-DYNAMICS SIMULATION ; SEVERE PLASTIC-DEFORMATION ; TENSILE DUCTILITY ; ZN ALLOY ; COBALT ; MG ; SEGREGATION ; MAXIMUM ; COPPER ; TWINS |
| WOS Research Area | Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering ; Physics, Applied ; Physics, Condensed Matter |
| WOS Subject | Materials Science ; Metallurgy & Metallurgical Engineering ; Physics |
| Classification | 二类 |
| Ranking | 1 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/77957 |
| Collection | 非线性力学国家重点实验室 |
| Affiliation | 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 |
| Recommended Citation 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. |
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| IrJ2018346.pdf（7849KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | View Download | |
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