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Deformation twinning in octahedron-based face-centered cubic metallic structures: Localized shear-force dipoles drive atomic displacements
Gu, Hengfei1,2; Liu, Chengze1,3; Yuan, Fusen1,3; Han, Fuzhou1,3; Zhang, Yingdong1,3; Ali, Muhammad1,3; Guo, Wenbin1,3; Ren, Jie1,3; Zhang, Lifeng4; Wu, Songquan5; Li, Geping1,3
Corresponding AuthorLi, Geping(gpli@imr.ac.cn)
2022-11-01
Source PublicationJOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
ISSN1005-0302
Volume126Pages:116-126
AbstractTwinning is found to impart favorable mechanical, physical and chemical properties to nanostructured materials. Deformation twinning prevails in face-centered cubic (FCC) nanocrystalline materials upon loading. In FCC structures, the <112>{111} deformation twinning is traditionally believed to nucleate and grow through layer by layer emission of 1/6<112> Shockley partial dislocations on consecutive {111} planes. We report that deformation twinning is able to occur in crystalline (Fe, Nb)(2)Zr-3(6) nanoparticles (NPs) that have a large Mn23Th6-type FCC structure with a Zr-octahedron as a motif. Based on direct atomic-scale observations, we discover a new zero-net-strain path for the <112>{111} deformation twinning in FCC structures. To form a [(1) over bar(1) over bar2]/(111) twin, for example, short ((1) over bar(1) over bar1) planes within two adjacent (111) plane layers in the repeated three-layer sequence of (111) planes are shear deformed continuously by a shear-force dipole along the [11 (2) over bar] direction like a domino effect, whereas the other (111) plane in the repeated sequence remains intact. In addition, a loading criterion for deformation twinning of a FCC NP under uniaxial compression is proposed based on our observations. Our work here not only extends the fundamental understanding on deformation twinning in FCC structures, but also opens up studies of deformation behaviors in a class of Mn23Th6-type FCC materials. (C) 2022 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
DOI10.1016/j.jmst.2022.02.043
Indexed BySCI
Language英语
WOS Research AreaMaterials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS IDWOS:000798064400003
PublisherJOURNAL MATER SCI TECHNOL
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/174228
Collection中国科学院金属研究所
Corresponding AuthorLi, Geping
Affiliation1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Univ Sci & Technol China, Hefei 230026, Peoples R China
4.Tianjin Univ, Inst Mol Plus, Tianjin 300072, Peoples R China
5.Univ Shanghai Sci & Technol, Sch Mat Sci & Engn, Shanghai 200093, Peoples R China
Recommended Citation
GB/T 7714
Gu, Hengfei,Liu, Chengze,Yuan, Fusen,et al. Deformation twinning in octahedron-based face-centered cubic metallic structures: Localized shear-force dipoles drive atomic displacements[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2022,126:116-126.
APA Gu, Hengfei.,Liu, Chengze.,Yuan, Fusen.,Han, Fuzhou.,Zhang, Yingdong.,...&Li, Geping.(2022).Deformation twinning in octahedron-based face-centered cubic metallic structures: Localized shear-force dipoles drive atomic displacements.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,126,116-126.
MLA Gu, Hengfei,et al."Deformation twinning in octahedron-based face-centered cubic metallic structures: Localized shear-force dipoles drive atomic displacements".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 126(2022):116-126.
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