Deformation twinning in octahedron-based face-centered cubic metallic structures: Localized shear-force dipoles drive atomic displacements

doi:10.1016/j.jmst.2022.02.043

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	Deformation twinning in octahedron-based face-centered cubic metallic structures: Localized shear-force dipoles drive atomic displacements
	Gu, Hengfei 3,5; Liu, Chengze 2,5; Yuan, Fusen 2,5; Han, Fuzhou 2,5; Zhang, Yingdong 2,5; Ali, Muhammad 2,5; Guo, Wenbin 2,5; Ren, Jie 2,5; Zhang, Lifeng 1; Wu, Songquan 4
刊名	JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
	2022-11-01
卷号	126 页码:116-126
ISSN号	1005-0302
DOI	10.1016/j.jmst.2022.02.043
通讯作者	Li, Geping(gpli@imr.ac.cn)
英文摘要	Twinning 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.
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	JOURNAL MATER SCI TECHNOL
WOS记录号	WOS:000798064400003
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/174227]
专题	金属研究所_中国科学院金属研究所
通讯作者	Li, Geping
作者单位	1.Tianjin Univ, Inst Mol Plus, Tianjin 300072, Peoples R China 2.Univ Sci & Technol China, Hefei 230026, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 4.Univ Shanghai Sci & Technol, Sch Mat Sci & Engn, Shanghai 200093, Peoples R China 5.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
推荐引用方式 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.