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学者姓名:韩卫忠

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Oxygen-gradient titanium with high strength, strain hardening and toughness EI SCIE Scopus
期刊论文 | 2023 , 246 | ACTA MATERIALIA
SCOPUS Cited Count: 13
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Abstract :

Titanium (Ti) is sensitive to small amount of oxygen interstitials, which has a major impact on its mechanical properties. Noticeable strengthening together with rapid decline in ductility induced by oxygen solutes poses a serious limitation for processing and application of Ti alloys. Here, we alleviate this dilemma by designing a unique oxygen-gradient in pure Ti, achieving a nontrivial combination of ultra-hardenability, high strength, toughness, and enhanced strain hardening rate. Plausible mechanism for such an oxygen-regulated plasticity in hexagonal Ti is proposed, which depends on twinning coordinating plasticity after yielding and oxygen-solute mediated dislocation slip subsequently. The dislocations glide on the common prismatic plane at low oxygen concentration, then prevail on the unusual 1st order pyramidal plane and then transfer to the peculiar basal plane and the 2nd order pyramidal plane with increasing oxygen content. These findings provide an effective mean to optimize pure Ti with desirable mechanical performance.

Keyword :

Dislocation Hardening Oxygen solutes Slip system Titanium

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GB/T 7714 Wang, Xiu-Qun , Han, Wei-Zhong . Oxygen-gradient titanium with high strength, strain hardening and toughness [J]. | ACTA MATERIALIA , 2023 , 246 .
MLA Wang, Xiu-Qun 等. "Oxygen-gradient titanium with high strength, strain hardening and toughness" . | ACTA MATERIALIA 246 (2023) .
APA Wang, Xiu-Qun , Han, Wei-Zhong . Oxygen-gradient titanium with high strength, strain hardening and toughness . | ACTA MATERIALIA , 2023 , 246 .
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A unified model for ductile-to-brittle transition in body-centered cubic metals EI Scopus SCIE
期刊论文 | 2023 , 141 , 193-198 | Journal of Materials Science and Technology
SCOPUS Cited Count: 18
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Abstract :

Ductile-to-brittle transition (DBT) is a well-known phenomenon in body-centered-cubic (BCC) metals, intermetallics and semiconductor materials. A quantitative prediction of the DBT temperature, however, has so far remained intractable. Here, we propose a unified model based on the efficacy of dislocation multiplication as the controlling factor for DBT, with the dislocation source efficiency governed by the relative mobility of screw versus edge dislocations. The model successfully predicts the DBT temperature of iron, molybdenum and tungsten, and also covers the influence of grain size, initial dislocation density, and the multiplicity of dislocation sources. A comparison with experiments indicates that the model captures the key DBT features, providing new insight into the toughness of BCC metals. © 2022

Keyword :

Brittle; Dislocation; Ductile; Metals; Mobility

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GB/T 7714 Zhang, Y.-H. , Ma, E. , Sun, J. et al. A unified model for ductile-to-brittle transition in body-centered cubic metals [J]. | Journal of Materials Science and Technology , 2023 , 141 : 193-198 .
MLA Zhang, Y.-H. et al. "A unified model for ductile-to-brittle transition in body-centered cubic metals" . | Journal of Materials Science and Technology 141 (2023) : 193-198 .
APA Zhang, Y.-H. , Ma, E. , Sun, J. , Han, W.-Z. . A unified model for ductile-to-brittle transition in body-centered cubic metals . | Journal of Materials Science and Technology , 2023 , 141 , 193-198 .
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Helium irradiation-induced ultrahigh hardening in niobium EI SCIE Scopus
期刊论文 | 2022 , 226 | ACTA MATERIALIA
SCOPUS Cited Count: 27
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Abstract :

In this work, using in-situ uniaxial tensile and compressive testing, microscopy, and theoretical analysis, we study the mechanism underlying the ultrahigh irradiation hardening in niobium (Nb). We show that irradiated Nb pillar exhibits a more than two-fold increase in the yield stress. With in-situ mechanical testing, we observe that He bubbles in Nb promote dislocation nucleation and multiple slip systems. The Nb pillars with 1.2 nm He bubbles fail by bubble coalescence and form a faceted fracture surface. In contrast, the Nb pillars with 8 nm He bubbles fail by bubble elongation and fragmentation. A theoretical analysis of the hardening contribution based solely on the density and size of He bubbles finds that it is less than one third of the experimentally observed hardening. To explain the large gap between the model and the experiment, we propose that the ultrahigh irradiation hardening originates from a large quantity of atomic-size, undetectable He-vacancy (He-V) complexes. The implanted He ions only account for less than 50% percent in the visible He bubbles, while most of them bind to vacancies to form stable He-V complexes that are distributed throughout the lattice. The strong interaction between dislocations and high density of He-V complexes is the chief source for the remarkable irradiation hardening observed in Nb.(c) 2022 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Keyword :

Complex Hardening Helium Irradiation Niobium

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GB/T 7714 Li, Jing-Ting , Beyerlein, Irene J. , Han, Wei-Zhong . Helium irradiation-induced ultrahigh hardening in niobium [J]. | ACTA MATERIALIA , 2022 , 226 .
MLA Li, Jing-Ting et al. "Helium irradiation-induced ultrahigh hardening in niobium" . | ACTA MATERIALIA 226 (2022) .
APA Li, Jing-Ting , Beyerlein, Irene J. , Han, Wei-Zhong . Helium irradiation-induced ultrahigh hardening in niobium . | ACTA MATERIALIA , 2022 , 226 .
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Design of high strength and wear-resistance beta-Ti alloy via oxygen-charging EI SCIE Scopus
期刊论文 | 2022 , 227 | ACTA MATERIALIA
SCOPUS Cited Count: 31
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Abstract :

Titanium (Ti) is a promising biomedical material due to its superior corrosion resistance, low elastic modulus and favorable biocompatibility. Nevertheless, Ti faces a dilemma because of its inferior abrasion performance and strength-ductility trade-off, which poses a limitation in application as biomedical implants. Here, we developed an oxygen-charging method to fabricate a beta-Ti alloy with combination of ultrahigh surface hardness, strength, toughness and remarkable wear resistance. The superior mechanical performance of beta-Ti alloy originates from a 200 mu m-thick alpha+beta phase hard shell, a 600 mu m oxygen gradient region and an oxygen-free beta-Ti core. The gradient phase and composition structures display different deformation mechanisms, transforming from simple but unusual basal slip in a phase to multiple-slip activities in beta phase. The unique oxygen gradient distribution makes beta-Ti alloy much stronger and tougher that can resist surface crack propagation and sample catastrophic failure. Oxygen charging is a novel technique to design high-performance Ti implants for biomedical applications. (C) 2022 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Keyword :

beta-Ti Hardening Oxygen-charging Toughness Wear

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GB/T 7714 Wang, Xiu-Qun , Zhang, Yu-Sheng , Han, Wei-Zhong . Design of high strength and wear-resistance beta-Ti alloy via oxygen-charging [J]. | ACTA MATERIALIA , 2022 , 227 .
MLA Wang, Xiu-Qun et al. "Design of high strength and wear-resistance beta-Ti alloy via oxygen-charging" . | ACTA MATERIALIA 227 (2022) .
APA Wang, Xiu-Qun , Zhang, Yu-Sheng , Han, Wei-Zhong . Design of high strength and wear-resistance beta-Ti alloy via oxygen-charging . | ACTA MATERIALIA , 2022 , 227 .
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Gradient Microstructure Induced Synergetic Strengthening in Strain-Softening Zn Alloy SCIE Scopus
期刊论文 | 2021 , 53 (1) , 12-17 | METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
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Abstract :

Synergetic strengthening by designing of gradient nanostructures is a novel method to enhance strength in metals and alloys. Herein, we realize synergetic strengthening in strain-softening Zn alloy with gradient nanostructures. The results show that synergetic strengthening accounts for at least 25.5 pct of the yield strength of the strain-softening Zn alloy. The synergetic strengthening is induced by the microstructural gradient and the resultant strength gradient regardless of specific hardening or softening of the refined microstructures.

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GB/T 7714 Zhang, Wei , Du, Yan , Han, Wei-Zhong et al. Gradient Microstructure Induced Synergetic Strengthening in Strain-Softening Zn Alloy [J]. | METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE , 2021 , 53 (1) : 12-17 .
MLA Zhang, Wei et al. "Gradient Microstructure Induced Synergetic Strengthening in Strain-Softening Zn Alloy" . | METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE 53 . 1 (2021) : 12-17 .
APA Zhang, Wei , Du, Yan , Han, Wei-Zhong , Huo, Wang-Tu , Hu, Jiang-Jiang . Gradient Microstructure Induced Synergetic Strengthening in Strain-Softening Zn Alloy . | METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE , 2021 , 53 (1) , 12-17 .
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Relative mobility of screw versus edge dislocations controls the ductile-to-brittle transition in metals SCIE PubMed
期刊论文 | 2021 , 118 (37) | PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
WoS CC Cited Count: 1
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Abstract :

Body-centered cubic metals including steels and refractory metals suffer from an abrupt ductile-to-brittle transition (DBT) at a critical temperature, hampering their performance and applications. Temperature-dependent dislocation mobility and dislocation nucleation have been proposed as the potential factors responsible for the DBT. However, the origin of this sudden switch from toughness to brittleness still remains a mystery. Here, we discover that the ratio of screw dislocation velocity to edge dislocation velocity is a controlling factor responsible for the DBT. A physical model was conceived to correlate the efficiency of Frank-Read dislocation source with the relative mobility of screw versus edge dislocations. A sufficiently high relative mobility is a prerequisite for the coordinated movement of screw and edge segments to sustain dislocation multiplication. Nanoindentation experiments found that DBT in chromium requires a critical mobility ratio of 0.7, above which the dislocation sources transition from disposable to regeneratable ones. The proposed model is also supported by the experimental results of iron, tungsten, and aluminum.

Keyword :

brittle dislocation ductile mobility

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GB/T 7714 Lu, Yan , Zhang, Yu-Heng , Ma, En et al. Relative mobility of screw versus edge dislocations controls the ductile-to-brittle transition in metals [J]. | PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA , 2021 , 118 (37) .
MLA Lu, Yan et al. "Relative mobility of screw versus edge dislocations controls the ductile-to-brittle transition in metals" . | PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 118 . 37 (2021) .
APA Lu, Yan , Zhang, Yu-Heng , Ma, En , Han, Wei-Zhong . Relative mobility of screw versus edge dislocations controls the ductile-to-brittle transition in metals . | PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA , 2021 , 118 (37) .
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Atomic-Scale Hidden Point-Defect Complexes Induce Ultrahigh-Irradiation Hardening in Tungsten EI SCIE PubMed
期刊论文 | 2021 , 21 (13) , 5798-5804 | NANO LETTERS
WoS CC Cited Count: 6
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Abstract :

Tungsten displays high strength in extreme temperature and radiation environments and is considered a promising plasma facing material for fusion nuclear reactors. Unlike other metals, it experiences substantial irradiation hardening, which limits service life and presents safety concerns. The origin of ultrahigh-irradiation hardening in tungsten cannot be well-explained by conventional strengthening theories. Here, we demonstrate that irradiation leads to near 3-fold increases in strength, while the usual defects that are generated only contribute less than one-third of the hardening. An analysis of the distribution of tagged atom-helium ions reveals that more than 87% of vacancies and helium atoms are unaccounted for. A large fraction of helium-vacancy complexes are frozen in the lattice due to high vacancy migration energies. Through a combination of in situ nanomechanical tests and atomistic calculations, we provide evidence that irradiation hardening mainly originates from high densities of atomic-scale hidden point-defect complexes.

Keyword :

Dislocation Hardening Helium Irradiation Tungsten

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GB/T 7714 Zheng, Ruo-Yao , Jian, Wu-Rong , Beyerlein, Irene J. et al. Atomic-Scale Hidden Point-Defect Complexes Induce Ultrahigh-Irradiation Hardening in Tungsten [J]. | NANO LETTERS , 2021 , 21 (13) : 5798-5804 .
MLA Zheng, Ruo-Yao et al. "Atomic-Scale Hidden Point-Defect Complexes Induce Ultrahigh-Irradiation Hardening in Tungsten" . | NANO LETTERS 21 . 13 (2021) : 5798-5804 .
APA Zheng, Ruo-Yao , Jian, Wu-Rong , Beyerlein, Irene J. , Han, Wei-Zhong . Atomic-Scale Hidden Point-Defect Complexes Induce Ultrahigh-Irradiation Hardening in Tungsten . | NANO LETTERS , 2021 , 21 (13) , 5798-5804 .
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Mechanism of brittle-to-ductile transition in tungsten under small-punch testing EI SCIE
期刊论文 | 2021 , 220 | ACTA MATERIALIA
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Abstract :

Exceptional high brittle-to-ductile transition temperature (BDTT) is a critical issue that limits the appli-cation of tungsten as structural materials. The controlling factors in BDT have been the focus of debate in past decades. In this work, small-punch testing were performed in a wide temperature range to ex-plore the mechanism of BDT in as-rolled tungsten. A transition in failure mode from cleavage cracking to delamination fracture with increasing temperature marks the BDT of the as-rolled tungsten. Numerous (001) planar triangle-shaped shear tongues are produced on fracture surface. The number density and distribution of shear tongues show a clear temperature and orientation dependence. Analysis of the slip line angle on the shear tongues reveals that profuse dislocation activities on the {110}, {112} and {123} planes at and above BDTT. Temperature and orientation dependent slip activities are decisive factors con-trolling the BDT. Below BDTT, fewer freely moved edge dislocations are insufficient to blunt the crack tip, thus as-rolled tungsten displays brittleness. Once above the BDTT, the mobility of screw dislocations is increased, and a large fraction of mixed dislocations glide could effectively suppress cracking and make as-rolled tungsten ductile. (c) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Keyword :

Brittle Dislocation Ductile Small-punch testing Tungsten

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GB/T 7714 Zhang, Yu-Heng , Han, Wei-Zhong . Mechanism of brittle-to-ductile transition in tungsten under small-punch testing [J]. | ACTA MATERIALIA , 2021 , 220 .
MLA Zhang, Yu-Heng et al. "Mechanism of brittle-to-ductile transition in tungsten under small-punch testing" . | ACTA MATERIALIA 220 (2021) .
APA Zhang, Yu-Heng , Han, Wei-Zhong . Mechanism of brittle-to-ductile transition in tungsten under small-punch testing . | ACTA MATERIALIA , 2021 , 220 .
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Interfaces Reduce Dislocation Loop Formation in Irradiated Nanolayered Zr-2.5Nb EI SCIE
期刊论文 | 2021 , 200 | SCRIPTA MATERIALIA
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Abstract :

Interface engineering is a useful method to reduce the accumulation of irradiation defects in metals. Here, we study the effect of interface on the formation of dislocation loops in helium and krypton ions irradiated nanolayered Zr-2.5Nb. Nanolaminated alpha/beta-Zr duplex-phase structures remain stable after irradiation at 400 degrees C up to 20 dpa. Dislocation denuded zones with width of 30 to 40 nm are formed at interfaces. The number density and size of both a-loops and c-loops are smaller in nanolayered sample because of interface accelerating point defects recombination. These observations indicate that alpha/beta-Zr interfaces effectively reduce dislocation loops formation. (C) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Keyword :

Dislocation loop Interface Irradiation Zr-2.5Nb

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GB/T 7714 Zhang, Jie-Wen , Liu, Si-Mian , Han, Wei-Zhong . Interfaces Reduce Dislocation Loop Formation in Irradiated Nanolayered Zr-2.5Nb [J]. | SCRIPTA MATERIALIA , 2021 , 200 .
MLA Zhang, Jie-Wen et al. "Interfaces Reduce Dislocation Loop Formation in Irradiated Nanolayered Zr-2.5Nb" . | SCRIPTA MATERIALIA 200 (2021) .
APA Zhang, Jie-Wen , Liu, Si-Mian , Han, Wei-Zhong . Interfaces Reduce Dislocation Loop Formation in Irradiated Nanolayered Zr-2.5Nb . | SCRIPTA MATERIALIA , 2021 , 200 .
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Thermal stable hierarchical 3D nanolayered Zr-2.5Nb SCIE
期刊论文 | 2021 , 36 (13) , 2630-2638 | JOURNAL OF MATERIALS RESEARCH
WoS CC Cited Count: 4
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Abstract :

Hierarchical 3D nanolayered Zr-2.5Nb has high strength, strain hardening and ductility because of the 3D alpha/beta-Zr networks, which is a promising structural material for nuclear reactor. However, excellent thermal stability is of great importance for materials service in nuclear reactor. Here, we study thermal stability of the hierarchical 3D nanolayered Zr-2.5Nb. After 1 h annealing at various temperatures below 700 degrees C, alpha-Zr layer thickness only has a slightly increase. The hardness, yield strength and uniform elongation of the sample remain unchanged. Interface orientation relationship and layer morphology keep stable after annealing, indicating high thermal stability. The duplex phase structures coarsen quickly after annealing at 1000 degrees C. An obvious increase in hardness and yield strength was observed when sample annealed at 300 degrees C, which relates to the precipitation of omega(iso) phase in beta-Zr. Controlling the number of omega(iso) phase is likely a strategy to further enhance the strength and ductility of the alloy.

Keyword :

5Nb Annealing Microstructure Nanolayer Strength Zr-2

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GB/T 7714 Zou, Xiao-Wei , Zhang, Jie-Wen , Han, Wei-Zhong . Thermal stable hierarchical 3D nanolayered Zr-2.5Nb [J]. | JOURNAL OF MATERIALS RESEARCH , 2021 , 36 (13) : 2630-2638 .
MLA Zou, Xiao-Wei et al. "Thermal stable hierarchical 3D nanolayered Zr-2.5Nb" . | JOURNAL OF MATERIALS RESEARCH 36 . 13 (2021) : 2630-2638 .
APA Zou, Xiao-Wei , Zhang, Jie-Wen , Han, Wei-Zhong . Thermal stable hierarchical 3D nanolayered Zr-2.5Nb . | JOURNAL OF MATERIALS RESEARCH , 2021 , 36 (13) , 2630-2638 .
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