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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)
2018-01-31
发表期刊PHILOSOPHICAL MAGAZINE
卷号98期号:13页码:1186-1203
ISSN1478-6435
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.
关键词Mg alloys molecular dynamics nanocrystals deformation twinning strengthening mechanisms stacking faults
DOI10.1080/14786435.2018.1432908
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收录类别SCI ; EI
语种英语
WOS记录号WOS:000428305900004
关键词[WOS]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
WOS类目Materials Science ; Metallurgy & Metallurgical Engineering ; Physics
论文分区二类
力学所作者排名1
引用统计
文献类型期刊论文
条目标识符http://dspace.imech.ac.cn/handle/311007/77957
专题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
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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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