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学者姓名:韩卫忠

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Helium bubbles enhance strength and ductility in small-volume Al-4Cu alloys SCIE
期刊论文 | 2019 , 165 , 112-116 | SCRIPTA MATERIALIA
WoS CC Cited Count: 1
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Abstract :

By adopting in situ nano-mechanical testing in transmission electron microscope, we reveal that nanoscale helium bubbles can simultaneously enhance strength and ductility in small-volume single-crystal Al-4Cu pillars, which breaks the paradox of trade-off between strength and ductility. Nanoscale helium bubbles serve as internal dislocation sources and shearable obstacles, which promote dislocation nucleation and storage, and give rise to higher flow stress, controllable plasticity and larger uniform deformation in Al-4Cu pillars. Nanoscale helium bubbles are rather stable under plastic straining. Bubble coarsening and coalescence are only observed at final localized deformation regime. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Keyword :

Helium bubbles Deformability In situ Al-4Cu Bubble coalescence

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GB/T 7714 Li, Shi-Hao , Zhang, Jian , Han, Wei-Zhong . Helium bubbles enhance strength and ductility in small-volume Al-4Cu alloys [J]. | SCRIPTA MATERIALIA , 2019 , 165 : 112-116 .
MLA Li, Shi-Hao 等. "Helium bubbles enhance strength and ductility in small-volume Al-4Cu alloys" . | SCRIPTA MATERIALIA 165 (2019) : 112-116 .
APA Li, Shi-Hao , Zhang, Jian , Han, Wei-Zhong . Helium bubbles enhance strength and ductility in small-volume Al-4Cu alloys . | SCRIPTA MATERIALIA , 2019 , 165 , 112-116 .
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Liquid-Like, Self-Healing Aluminum Oxide during Deformation at Room Temperature EI SCIE PubMed Scopus
期刊论文 | 2018 , 18 (4) , 2492-2497 | NANO LETTERS
WoS CC Cited Count: 13 SCOPUS Cited Count: 15
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Abstract :

Effective protection from environmental degradation relies on the integrity of oxide as diffusion barriers. Ideally, the passivation layer can repair its own breaches quickly under deformation. While studies suggest that the native aluminum oxide may manifest such properties, it has yet to be experimentally proven because direct observations of the air-environmental deformation of aluminum oxide and its initial formation at room temperature are challenging. Here, we report in situ experiments to stretch pure aluminum nanotips under O-2 gas environments in a transmission electron microscope (TEM). We discovered that aluminum oxide indeed deforms like liquid and can match the deformation of Al without any cracks/spallation at moderate strain rate. At higher strain rate, we exposed fresh metal surface, and visualized the self-healing process of aluminum oxide at atomic resolution. Unlike traditional thin-film growth or nanoglass consolidation processes, we observe seamless coalescence of new oxide islands without forming any glass-glass interface or surface grooves, indicating greatly accelerated glass kinetics at the surface compared to the bulk.

Keyword :

in situ TEM Superplasticity stress-corrosion cracking self-healing glass surface aluminum oxide

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GB/T 7714 Yang, Yang , Kushima, Akihiro , Han, Weizhong et al. Liquid-Like, Self-Healing Aluminum Oxide during Deformation at Room Temperature [J]. | NANO LETTERS , 2018 , 18 (4) : 2492-2497 .
MLA Yang, Yang et al. "Liquid-Like, Self-Healing Aluminum Oxide during Deformation at Room Temperature" . | NANO LETTERS 18 . 4 (2018) : 2492-2497 .
APA Yang, Yang , Kushima, Akihiro , Han, Weizhong , Xin, Huolin , Li, Ju . Liquid-Like, Self-Healing Aluminum Oxide during Deformation at Room Temperature . | NANO LETTERS , 2018 , 18 (4) , 2492-2497 .
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Cracking behavior of helium-irradiated small-volume copper EI SCIE Scopus
期刊论文 | 2018 , 147 , 1-5 | SCRIPTA MATERIALIA
WoS CC Cited Count: 5 SCOPUS Cited Count: 6
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Abstract :

Radiation-induced grain-boundary helium bubbles are the cause of the significant helium embrittlement However, the influence of grain-interior helium bubbles on the cracking behavior of metals has not been explored. Here, we investigate the cracking propensity of helium-irradiated small-volume Cu single-crystals, and compare with those of Cu single-crystals and Cu bicrystals. We found that the irradiation-induced helium bubbles only slightly increased the cracking propensity of the single-crystal Cu, while the cracking resistance of the helium-irradiated Cu single-crystals was superior to that of the Cu bicrystals, both with and without helium bubbles. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Keyword :

Cavity Helium bubble Nano-bridge Cracking Irradiation

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GB/T 7714 Han, Wei-Zhong , Ding, Ming-Shuai , Shan, Zhi-Wei . Cracking behavior of helium-irradiated small-volume copper [J]. | SCRIPTA MATERIALIA , 2018 , 147 : 1-5 .
MLA Han, Wei-Zhong et al. "Cracking behavior of helium-irradiated small-volume copper" . | SCRIPTA MATERIALIA 147 (2018) : 1-5 .
APA Han, Wei-Zhong , Ding, Ming-Shuai , Shan, Zhi-Wei . Cracking behavior of helium-irradiated small-volume copper . | SCRIPTA MATERIALIA , 2018 , 147 , 1-5 .
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Defect-interface interactions in irradiated Cu/Ag nanocomposites EI Scopus SCIE
期刊论文 | 2018 , 160 , 211-223 | Acta Materialia
WoS CC Cited Count: 4 SCOPUS Cited Count: 2
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Abstract :

In this work, we employ transmission electron microscopy and helium ion irradiation to study the response of biphase interfaces to radiation induced point defect fluxes from the two adjoining phases. Analysis of interface-affected defect accumulation was carried out over a wide range of radiation damage levels from near zero displacement per atom (dpa) to 16 dpa and helium concentrations of 0 at.% to 8 at.%. Results show a strong interface density dependence in which Cu/Ag interfaces in the nanolayered regions spaced <500 nm were remarkably microstructural stable over the entire range without accumulating micro-scale defects, while those spaced >1 μm apart were destroyed. We report the concomitant development of a bubble-free zone in Cu that was independent of defect levels and interface-contacting bubbles zone in Ag. This finding is explained by bias segregation to the interface of interstitials from Ag and vacancies to misfit dislocation nodes in the interface from Cu. The point defect transfer across the interface can be explained by the spatial variation in interface pressure within the interface and gradient in pressure across the interface, both originating from the lattice mismatch and surface energy difference between the two crystals. © 2018 Acta Materialia Inc.

Keyword :

Defect accumulation Helium bubbles Helium concentrations Interface interaction Interface pressure Radiation defects Spatial variations Surface energy differences

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GB/T 7714 Wang, Min , Beyerlein, Irene J. , Zhang, Jian et al. Defect-interface interactions in irradiated Cu/Ag nanocomposites [J]. | Acta Materialia , 2018 , 160 : 211-223 .
MLA Wang, Min et al. "Defect-interface interactions in irradiated Cu/Ag nanocomposites" . | Acta Materialia 160 (2018) : 211-223 .
APA Wang, Min , Beyerlein, Irene J. , Zhang, Jian , Han, Wei-Zhong . Defect-interface interactions in irradiated Cu/Ag nanocomposites . | Acta Materialia , 2018 , 160 , 211-223 .
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Helium Nanobubbles Enhance Superelasticity and Retard Shear Localization in Small-Volume Shape Memory Alloy EI SCIE PubMed Scopus
期刊论文 | 2017 , 17 (6) , 3725-3730 | NANO LETTERS | IF: 12.08
WoS CC Cited Count: 5 SCOPUS Cited Count: 5
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Abstract :

The intriguing phenomenon of metal superelasticity relies on stress-induced martensitic transformation (SIMT), which is well-known to be governed by developing cooperative strain accommodation at multiple length scales. It is therefore scientifically interesting to see what happens when this natural length scale hierarchy is disrupted. One method is producing pillars that confine the sample volume to micrometer length scale. Here we apply yet another intervention, helium nanobubbles injection, which produces porosity on the order of several nanometers. While the pillar confinement suppresses superelasticity, we found the dispersion of 5-10 nm helium nanobubbles do the opposite of promoting superelasticity in a Ni53.5Fe19.5Ga27 shape memory alloy. The role of helium nanobubbles in modulating the competition between ordinary dislocation slip plasticity and SIMT is discussed.

Keyword :

irradiation superelasticity phase transformation helium bubble Shape memory alloy

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GB/T 7714 Han, Wei-Zhong , Zhang, Jian , Ding, Ming-Shuai et al. Helium Nanobubbles Enhance Superelasticity and Retard Shear Localization in Small-Volume Shape Memory Alloy [J]. | NANO LETTERS , 2017 , 17 (6) : 3725-3730 .
MLA Han, Wei-Zhong et al. "Helium Nanobubbles Enhance Superelasticity and Retard Shear Localization in Small-Volume Shape Memory Alloy" . | NANO LETTERS 17 . 6 (2017) : 3725-3730 .
APA Han, Wei-Zhong , Zhang, Jian , Ding, Ming-Shuai , Lv, Lan , Wang, Wen-Hong , Wu, Guang-Heng et al. Helium Nanobubbles Enhance Superelasticity and Retard Shear Localization in Small-Volume Shape Memory Alloy . | NANO LETTERS , 2017 , 17 (6) , 3725-3730 .
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In Situ Study of Deformation Twinning and Detwinning in Helium Irradiated Small-Volume Copper EI SCIE Scopus
期刊论文 | 2017 , 19 (12) | ADVANCED ENGINEERING MATERIALS | IF: 2.576
WoS CC Cited Count: 5 SCOPUS Cited Count: 6
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Abstract :

The influence of nanoscale helium bubbles on the deformation twinning and detwinning behavior of submicron-sized Cu is investigated under tension, compression, and cyclic loading. In situ nanomechanical tests performed inside a transmission electron microscope reveal that twinning and detwinning occur readily in helium irradiated copper under both tension and compression. Continuous shearing of helium bubbles by Shockley partials leads to twin formation, whereas the residual back-stress accumulated from dislocation-bubble interactions assist in detwinning. These interactions also elevate the critical shear stress for partial dislocation slip in helium irradiated Cu compared to that in fully dense Cu. The growth twin boundaries can significantly enhance the twinning stress in helium irradiated Cu pillar, and deformation twin-growth twin boundary interaction promotes the formation of internal crack and thus accelerates failure. The effect of crystallographic orientation and sample size on the overall deformation characteristics of helium irradiated Cu is briefly discussed. The current studies show that deformation twinning and detwinning are also active deformation models in helium irradiated small-volume copper.

Keyword :

helium bubble in situ TEM detwinning twinning crack

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GB/T 7714 Han, Wei-Zhong , Ding, Ming-Shuai , Narayan, R. Lakshmi et al. In Situ Study of Deformation Twinning and Detwinning in Helium Irradiated Small-Volume Copper [J]. | ADVANCED ENGINEERING MATERIALS , 2017 , 19 (12) .
MLA Han, Wei-Zhong et al. "In Situ Study of Deformation Twinning and Detwinning in Helium Irradiated Small-Volume Copper" . | ADVANCED ENGINEERING MATERIALS 19 . 12 (2017) .
APA Han, Wei-Zhong , Ding, Ming-Shuai , Narayan, R. Lakshmi , Shan, Zhi-Wei . In Situ Study of Deformation Twinning and Detwinning in Helium Irradiated Small-Volume Copper . | ADVANCED ENGINEERING MATERIALS , 2017 , 19 (12) .
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Deformation of small-volume Al-4Cu alloy under electron beam irradiation EI SCIE Scopus
期刊论文 | 2017 , 141 , 183-192 | ACTA MATERIALIA | IF: 6.036
WoS CC Cited Count: 2 SCOPUS Cited Count: 3
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Abstract :

Energetic electron beams (e-beams) are used in the welding, 3D printing and imaging of various materials. It is commonly accepted that the e-beam irradiation inside transmission electron microscope has a negligible effect on the intrinsic mechanical properties of small-volume metallic materials during in situ investigation. However, as small-volume Al is usually covered by a thin layer of native oxide, we show here that high-energy (200 key) e-beam irradiation can dramatically alter the deformation behavior. E-beam irradiation can drastically rejuvenate the amorphous structure of the oxide layer, producing a defective interface/surface, and promoting the transition of the deformation mode from internal dislocation multiplication to interface-dominated dislocation nucleation mediated plasticity, as indicated by the enhanced strain rate sensitivity and reduced activation volume. Moreover, the amorphous oxide layer undergoes viscous flow under the e-beam irradiation, such that nanoscale single crystal Al confined by a 29% volume fraction of native oxide shell exhibits more than 60% uniform elongation. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Keyword :

Al oxide shell Strain rate sensitivity Ductility Electron beam irradiation Activation volume

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GB/T 7714 Li, Shi-Hao , Han, Wei-Zhong , Shan, Zhi-Wei . Deformation of small-volume Al-4Cu alloy under electron beam irradiation [J]. | ACTA MATERIALIA , 2017 , 141 : 183-192 .
MLA Li, Shi-Hao et al. "Deformation of small-volume Al-4Cu alloy under electron beam irradiation" . | ACTA MATERIALIA 141 (2017) : 183-192 .
APA Li, Shi-Hao , Han, Wei-Zhong , Shan, Zhi-Wei . Deformation of small-volume Al-4Cu alloy under electron beam irradiation . | ACTA MATERIALIA , 2017 , 141 , 183-192 .
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Atomistic modeling study of a strain-free stress driven grain boundary migration mechanism EI SCIE Scopus
期刊论文 | 2017 , 134 , 52-56 | SCRIPTA MATERIALIA | IF: 4.163
WoS CC Cited Count: 5 SCOPUS Cited Count: 5
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Abstract :

A recent experiment (Scripta Mater., 65:990, 2011) shows that the Sigma 7 {032]/{032} grain boundary in Al can migrate under external stress but produces no strain. Here, based on a bi-crystallographic analysis, an atomic shuffling path was identified as the feasible mechanism for this grain boundary migration. By a density functional theory calculation, it reveals that the enthalpy barrier of this atomic shuffling path increases by external shear stress applied with shear of the grain boundary along the tilt axis < 111 >, which is in good agreement with experimentally measured shear-direction-dependence of activation enthalpy for this grain boundary migration. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All tights reserved.

Keyword :

Coincidence lattice Grain boundary structure Atomic shuffling motion Grain boundary migration Density functional theory (DFT)

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GB/T 7714 Wan, Liang , Ishii, Akio , Du, Jun-Ping et al. Atomistic modeling study of a strain-free stress driven grain boundary migration mechanism [J]. | SCRIPTA MATERIALIA , 2017 , 134 : 52-56 .
MLA Wan, Liang et al. "Atomistic modeling study of a strain-free stress driven grain boundary migration mechanism" . | SCRIPTA MATERIALIA 134 (2017) : 52-56 .
APA Wan, Liang , Ishii, Akio , Du, Jun-Ping , Han, Wei-Zhong , Mei, Qingsong , Ogata, Shigenobu . Atomistic modeling study of a strain-free stress driven grain boundary migration mechanism . | SCRIPTA MATERIALIA , 2017 , 134 , 52-56 .
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Small-volume aluminum alloys with native oxide shell deliver unprecedented strength and toughness EI SCIE Scopus
期刊论文 | 2017 , 126 , 202-209 | ACTA MATERIALIA | IF: 6.036
WoS CC Cited Count: 9 SCOPUS Cited Count: 10
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Abstract :

Mechanically robust nanoscale metallic materials are highly desirable in many miniaturized devices. However, the lack of strain hardening and controllable plasticity plagues such small-volume metals. Using Al-4Cu alloy as an example, here we show that a submicron-sized metallic material with ultrathin native oxide shell exhibits a high degree of deformation controllability, unprecedented strain hardening, size strengthening and toughness, in uniaxial tensile deformation. The metal native oxide "composite" is easy to make, and the emergent properties extend well beyond the benchmark range known for metals in a normalized (i.e., dimensionless) strength-toughness plot. The origin of the combination of strengthening and plastic stability is that an intact ultrathin native oxide shell exerts a strong confinement on dislocation movement and annihilation, thereby breaking the envelope on dislocation storage and strain hardening achievable in small-volume metals. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Keyword :

Strength Native oxide shell Small-volume metals Toughness Aluminum

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GB/T 7714 Li, Shi-Hao , Han, Wei-Zhong , Li, Ju et al. Small-volume aluminum alloys with native oxide shell deliver unprecedented strength and toughness [J]. | ACTA MATERIALIA , 2017 , 126 : 202-209 .
MLA Li, Shi-Hao et al. "Small-volume aluminum alloys with native oxide shell deliver unprecedented strength and toughness" . | ACTA MATERIALIA 126 (2017) : 202-209 .
APA Li, Shi-Hao , Han, Wei-Zhong , Li, Ju , Ma, Evan , Shan, Zhi-Wei . Small-volume aluminum alloys with native oxide shell deliver unprecedented strength and toughness . | ACTA MATERIALIA , 2017 , 126 , 202-209 .
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Microstructural characterization and properties of Ti-28Ta at.% powders produced by plasma rotating electrode process EI SCIE Scopus
期刊论文 | 2017 , 713 , 222-228 | JOURNAL OF ALLOYS AND COMPOUNDS | IF: 3.779
WoS CC Cited Count: 8 SCOPUS Cited Count: 9
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Abstract :

Ti-28 at.% Ta powders were produced by rapid solidification via plasma rotating electrode process (PREP). It is found that microstructure, morphology and phase constituents of Ti-28Ta powders are particle size dependent. Small powder particle exhibit the formation of predominant martensitic alpha '' and minor metastable beta, whilst large particles consist of primary metastable beta with minor martensitic alpha '' phase. The amount of martensitic alpha '' increases while the amount of metastable beta phase decreases with decreasing the particle size. The martensitic alpha '' lath with the size of about 50 nm wide and 1 mu m long are formed preferentially at the beta grain boundaries. The martensitic transformation start temperature (M-s) and peak temperature (M-p) are similar to 390 degrees C and similar to 340 degrees C respectively for the Ti-28Ta powders with the particle size between 40 and 65 mu m. An increased Vickers micro-hardness is obtained and is associated with decreasing particle size. (C) 2017 Elsevier B.V. All rights reserved.

Keyword :

Martensitic transformation Rapid solidification Ti-Ta alloy Plasma rotating electrode process (PREP)

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GB/T 7714 Yin, J. O. , Chen, G. , Zhao, S. Y. et al. Microstructural characterization and properties of Ti-28Ta at.% powders produced by plasma rotating electrode process [J]. | JOURNAL OF ALLOYS AND COMPOUNDS , 2017 , 713 : 222-228 .
MLA Yin, J. O. et al. "Microstructural characterization and properties of Ti-28Ta at.% powders produced by plasma rotating electrode process" . | JOURNAL OF ALLOYS AND COMPOUNDS 713 (2017) : 222-228 .
APA Yin, J. O. , Chen, G. , Zhao, S. Y. , Ge, Y. , Li, Z. F. , Yang, P. J. et al. Microstructural characterization and properties of Ti-28Ta at.% powders produced by plasma rotating electrode process . | JOURNAL OF ALLOYS AND COMPOUNDS , 2017 , 713 , 222-228 .
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