Haofei Zhou

Beijing Chaoyang Emergency Medical Center

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Direct Observation of Disconnection-Mediated Grain Rotation

Yingbin Chen Hailin Deng Qi Zhu Haofei Zhou Jiangwei Wang

Grain rotation is a well-known phenomenon during plastic deformation and recrystallization of polycrystalline materials. Theoretical models suggest that atomic-scale processes of grain rotation commonly involve disconnection flow associated with grain boundary (GB) migration, but direct observations have been rare thus far. Here, we present direct evidences that grain rotation in polycrystals can proceed through the motion and annihilation of curved GB disconnections, using in situ nanomechanical testing and atomistic simulations. The dynamics of curved GB disconnections often accompanies an orientation change of grains in real polycrystals, by which the nanograin rotates gradually alongside GB migration and GB curving in three-dimensional (3D) space. This finding has implications for understanding GB-mediated processes in polycrystalline materials.

Disconnection

10.2139/ssrn.4823785

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Non-localized deformation in metallic alloys with amorphous structure

Acta Materialia (2014)

Haofei Zhou Cheng Zhong Qi Cao Shaoxing Qu X.D. Wang

Shearing (physics)

Shear band

Ribbon

10.1016/j.actamat.2014.01.003

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Citations (69)

Anterior cervical trapezoid corpectomy and fusion (ACTCF): a novel technique for cervical spondylotic myelopathy

Neurosurgical Review (2025)

Jixuan Huang Zhexuan Fan Weishi Liang Yong Hai Haofei Zhou

Corpectomy

Kyphosis

Discectomy

10.1007/s10143-025-03407-2

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Unravelling the Relation between Free Volume Gradient and Shear Band Deflection Induced Extra Plasticity in Metallic Glasses

Haiming Lu Yao Tang Haofei Zhou

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Shear band

10.2139/ssrn.4790947

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Twinning-assisted dynamic adjustment of grain boundary mobility

Nature Communications (2021)

Qishan Huang Qi Zhu Yingbin Chen Mingyu Gong Jixue Li

Grain boundary (GB) plasticity dominates the mechanical behaviours of nanocrystalline materials. Under mechanical loading, GB configuration and its local deformation geometry change dynamically with the deformation; the dynamic variation of GB deformability, however, remains largely elusive, especially regarding its relation with the frequently-observed GB-associated deformation twins in nanocrystalline materials. Attention here is focused on the GB dynamics in metallic nanocrystals, by means of well-designed in situ nanomechanical testing integrated with molecular dynamics simulations. GBs with low mobility are found to dynamically adjust their configurations and local deformation geometries via crystallographic twinning, which instantly changes the GB dynamics and enhances the GB mobility. This self-adjust twin-assisted GB dynamics is found common in a wide range of face-centred cubic nanocrystalline metals under different deformation conditions. These findings enrich our understanding of GB-mediated plasticity, especially the dynamic behaviour of GBs, and bear practical implication for developing high performance nanocrystalline materials through interface engineering.

Nanocrystalline material

Deformation mechanism

10.1038/s41467-021-27002-3

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A Plastic Deformation Mechanism by Necklace Dislocations Near Crack-like Defects in Nanotwinned Metals

Journal of Applied Mechanics (2015)

Haofei Zhou Huajian Gao

Nanotwinned metals are a class of hierarchically structured materials that appear to transcend the limits of conventional material systems by exhibiting an exceptional combination of superior strength, ductility and resistance to fracture, fatigue, and wear. Recently, we reported a type of necklace dislocations in nanotwinned metals which become operative when the twin boundary (TB) spacing falls below a few nanometers. Here, we show that the presence of a cracklike defect as the dominant dislocation source could allow the same mechanism to operate at much larger twin spacings. This finding calls for further theoretical and experimental investigations of a new type of TB related dislocation mechanism which may play particularly important roles in crack-tip deformation in nanotwinned metals.

Ductility (Earth science)

Deformation mechanism

Necklace

10.1115/1.4030417

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Citations (16)

Corrigendum to “Orientation effect on α/β phase interface mediated deformation mechanism in titanium alloy” [Comput. Mater. Sci. 231 (2024) 112616]

Computational Materials Science (2024)

Panpan Wan Qishan Huang Ming Li Ping Qü Peng Wang

Titanium alloy

10.1016/j.commatsci.2023.112647

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Grain boundary plasticity initiated by excess volume

Proceedings of the National Academy of Sciences (2024)

Qi Zhu Qingkun Zhao Qishan Huang Yingbin Chen Subra Suresh

Grain boundaries (GBs) serve not only as strong barriers to dislocation motion, but also as important carriers to accommodate plastic deformation in crystalline solids. During deformation, the inherent excess volume associated with loose atomic packing in GBs brings about a microscopic degree of freedom that can initiate GB plasticity, which is beyond the classic geometric description of GBs. However, identification of this atomistic process has long remained elusive due to its transient nature. Here, we use Au polycrystals to unveil a general and inherent route to initiating GB plasticity via a transient topological transition process triggered by the excess volume. This route underscores the general impact of a microscopic degree of freedom which is governed by a stress-triaxiality-based criterion. Our findings provide a missing perspective for developing a more comprehensive understanding of the role of GBs in plastic deformation.

Transient (computer programming)

10.1073/pnas.2400161121

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Citations (7)

Atomistic investigation of interface-dominated deformation mechanisms in nanolayered Cu–Ag eutectic alloy

Journal of Materials Science (2024)

Hongtao Xie Haofei Zhou Huck Beng Chew Ruizhi Li

Interface (matter)

10.1007/s10853-024-10109-5

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Citations (0)

Shear band initiation induced by slip-twin boundary interactions