Dr. Ze Zhang

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Academic Career Length

21Years (2006-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

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17 July 2014 in Nature Communications

Journal Article

Grain rotation mediated by grain boundary dislocations in nanocrystalline platinum

Lihua Wang

Jiao Teng

Pan Liu

Akihiko Hirata

En Ma

Xiaodong Han

Grain rotation is a well-known phenomenon during high (homologous) temperature deformation and recrystallization of polycrystalline materials. In recent years, grain rotation has also been proposed as a plasticity mechanism at low temperatures (for example, room temperature for metals), especially for nanocrystalline grains with diameter d less than ~15 nm. Here, in tensile-loaded Pt thin films under a high-resolution transmission electron microscope, we show that the plasticity mechanism transitions from cross-grain dislocation glide in larger grains (d>6 nm) to a mode of coordinated rotation of multiple grains for grains with d<6 nm. The mechanism underlying the grain rotation is dislocation climb at the grain boundary, rather than grain boundary sliding or diffusional creep. Our atomic-scale images demonstrate directly that the evolution of the misorientation angle between neighbouring grains can be quantitatively accounted for by the change of the Frank–Bilby dislocation content in the grain boundary.

29 January 2021 in Science

Journal Article

In situ manipulation of the active Au-TiO ₂ interface with atomic precision during CO oxidation

Xiao-Yan Li

Rotation during reaction: Determining changes in heterogeneous catalysts under reaction conditions can provide insight into mechanisms. Under reaction conditions, not only can metal nanoparticles change shape but their interaction with the oxide support could also be affected. Yuan et al. used aberration-corrected environmental transmission electron microscopy to study gold nanoparticles on titanium surfaces at low electron beam doses. During carbon monoxide (CO) oxidation at total pressures of a few millibars and 500°C, they observed that gold nanoparticles rotated by about 10° but returned to their original position when CO was removed. Density function theory calculations indicated that rotation was induced by changes in the coverage of adsorbed molecular oxygen at the interface. Science , this issue p. 517

3 January 2024 in Nature

Journal Article

Negative mixing enthalpy solid solutions deliver high strength and ductility

Zibing An

Lingyu Zhu

+23

10 March 2017 in Advanced Materials

Journal Article

Atomic Defects in Two‐Dimensional Materials: From Single‐Atom Spectroscopy to Functionalities in Opto‐/Electronics, Nanomagnetism, and Catalysis

Jinhua Hong

Chuanhong Jin

Jun Yuan

Ze Zhang

24 January 2020 in Science

Journal Article

Visualizing H ₂ O molecules reacting at TiO ₂ active sites with transmission electron microscopy

Xiao-Yan Li

Imaging reactive surface water: Recent developments in transmission electron microscopy (TEM) have enabled imaging of single atoms, but adsorbed gas molecules have proven more challenging because of a lack of sufficient image contrast. Yuan et al. adsorbed water and carbon monoxide (CO) on a reconstructed nanocrystalline anatase titanium dioxide (TiO ₂ ) surface that has protruding TiO ₃ ridges every four unit cells, which provide regions of distinct contrast. Water adsorption on this surface during environmental TEM experiments led to the formation of twinned protrusions. These structures developed dynamic contrast as the water reacted with coexposed CO to form hydrogen and carbon dioxide. Science , this issue p. 428

18 March 2022 in Science

Journal Article

Tracking the sliding of grain boundaries at the atomic scale

+14

Grain boundaries (GBs) play an important role in the mechanical behavior of polycrystalline materials. Despite decades of investigation, the atomic-scale dynamic processes of GB deformation remain elusive, particularly for the GBs in polycrystals, which are commonly of the asymmetric and general type. We conducted an in situ atomic-resolution study to reveal how sliding-dominant deformation is accomplished at general tilt GBs in platinum bicrystals. We observed either direct atomic-scale sliding along the GB or sliding with atom transfer across the boundary plane. The latter sliding process was mediated by movements of disconnections that enabled the transport of GB atoms, leading to a previously unrecognized mode of coupled GB sliding and atomic plane transfer. These results enable an atomic-scale understanding of how general GBs slide in polycrystalline materials.

About Me

Prof. Ze Zhang is a professor and Ph.D. supervisor at Zhejiang University and an expert in materials science and crystal structure. In 1987, he received a doctor's degree from the Institute of Metals, Chinese Academy of Sciences. He also serves as the Chief Scientist of the National Major Basic Research Project (973), a member of the Fourth Expert Advisory Committee of the Mathematical and Physical Sciences Department of the National Natural Science Foundation of China, the Chairman of the China Association for Analysis and Testing, and the Chairman of the China Society for Electron Microscopy, and he holds other positions. He has won nine national and ministerial-level awards, including the "National Natural Science First Prize", the first "Wu Jianxiong Physics Award", the first "Youth Science and Technology Award", the first "China Youth Scientist Award", the "He Liang He Li Award", and the "Qiu Shi" Award. He has long been engaged in research on electron microstructures, such as quasicrystals and low-dimensional nanomaterials. He combines atomic-level microstructure analysis with important issues in materials science, systematically studying and solving important problems in international materials science, such as quasicrystals and low-dimensional nanomaterials, and he has achieved creative research results.

Dr. Ze Zhang

Dr. Ze Zhang

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