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学者姓名:韩卫忠

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Interface-facilitated stable plasticity in ultra-fine layered FeAl/FeAl2 micro-pillar at high temperature EI SCIE
期刊论文 | 2021 , 73 , 61-65 | Journal of Materials Science and Technology
WoS CC Cited Count: 2
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Abstract :

Fe-Al compounds possess a combination of high strength and corrosion resistance at high temperatures. However, increasing Al content to make them lighter results in embrittlement. Here, we investigate the high-temperature behavior of a novel, lightweight, ultra-fine-layered FeAl/FeAl2 material. We report a transition from unstable to stable plasticity at 450 °C. Below 450 °C, deformation is dominated by localized shear deformation within the soft FeAl layers, while above 450 °C, it proceeds by co-deformation between FeAl and the brittle FeAl2 layers. We show that co-deformation is associated with the temperature at which the interface converts from sliding to sourcing dislocations for FeAl2. © 2020

Keyword :

Aluminum alloys Iron compounds Aluminum compounds Aluminum corrosion Corrosion resistance Plasticity Iron alloys Binary alloys

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GB/T 7714 Li, Lulu , Beyerlein, Irene J , Han, Weizhong . Interface-facilitated stable plasticity in ultra-fine layered FeAl/FeAl2 micro-pillar at high temperature [J]. | Journal of Materials Science and Technology , 2021 , 73 : 61-65 .
MLA Li, Lulu 等. "Interface-facilitated stable plasticity in ultra-fine layered FeAl/FeAl2 micro-pillar at high temperature" . | Journal of Materials Science and Technology 73 (2021) : 61-65 .
APA Li, Lulu , Beyerlein, Irene J , Han, Weizhong . Interface-facilitated stable plasticity in ultra-fine layered FeAl/FeAl2 micro-pillar at high temperature . | Journal of Materials Science and Technology , 2021 , 73 , 61-65 .
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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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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 Zr-2.5Nb Interface Irradiation

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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 等. "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: 1
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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 Strength Nanolayer Zr-2 Microstructure

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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 等. "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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Gradient Microstructure Induced Synergetic Strengthening in Strain-Softening Zn Alloy SCIE
期刊论文 | 2021 | METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
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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 .
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 (2021) .
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 .
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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
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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 Irradiation Helium Hardening 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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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
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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 :

dislocation brittle mobility ductile

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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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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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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 :

Dislocation Small-punch testing Ductile Tungsten Brittle

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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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A Comparative Study of Microstructures and Mechanical Behavior of Laser Metal Deposited and Electron Beam Melted Ti-6Al-4V SCIE
期刊论文 | 2021 | JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
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The microstructures and mechanical properties of Ti-6Al-4V fabricated using laser metal deposition (LMD) and electron beam melting (EBM) were investigated and compared. The hardness, strength and work hardening exponent (n) of the LMD samples are superior to that of EBM samples. The EBM samples are more ductile, exhibit resistance to rapid plastic strain localization and have uniform hardness throughout the build. A detailed microstructural characterization was conducted for both alloys before and after the tensile tests. The differences in mechanical behavior of the two samples originate from their distinct dislocation densities within alpha and the relative proportions of Widmanstatten and colony type arrangements of the alpha+beta laths, which in turn are an outcome of the distinct cooling profiles in the two additive manufacturing methods. On the basis of these results, strategies to improve the mechanical properties of both alloys are discussed.

Keyword :

Ti-6Al-4V microstructures additive manufacturing electron beam melting laser metal deposition

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GB/T 7714 Rashid, Mehmood , Narayan, R. Lakshmi , Zhang, Dan-Li et al. A Comparative Study of Microstructures and Mechanical Behavior of Laser Metal Deposited and Electron Beam Melted Ti-6Al-4V [J]. | JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE , 2021 .
MLA Rashid, Mehmood et al. "A Comparative Study of Microstructures and Mechanical Behavior of Laser Metal Deposited and Electron Beam Melted Ti-6Al-4V" . | JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE (2021) .
APA Rashid, Mehmood , Narayan, R. Lakshmi , Zhang, Dan-Li , Han, Wei-Zhong . A Comparative Study of Microstructures and Mechanical Behavior of Laser Metal Deposited and Electron Beam Melted Ti-6Al-4V . | JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE , 2021 .
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Precipitation characteristics and distributions of subsurface hydrides in zirconium EI SCIE
期刊论文 | 2021 , 216 | ACTA MATERIALIA
WoS CC Cited Count: 1
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Hydride precipitates that develop in Zr after absorbing hydrogen can impart significant material hardening and embrittlement. Here, we use electrolytic hydrogen charging to synthesize Zr samples with different subsurface hydride aging times and transmission electron microscopy to understand the mechanisms underlying hydride precipitation and their distributions across the microstructure of pure Zr. Subsurface hydride formation involves volumetric swelling, causing the sample surface to produce bumps. Analysis of the morphologies and spatial distributions of these bumps can reveal several important characteristics of hydrides below. The analysis indicates that subsurface hydrides first form by isolated nucleation followed by coalescence. The shape of the hydride bump is found to be determined by the angle between the basal plane of the subsurface hydride and the sample surface. We reveal that, at room temperature, the hydride phase transition sequence follows gamma-ZrH delta-ZrH1.66 -> epsilon-ZrH2. The two main alpha-Zr/hydride orientation relationships are 1) (0001)(alpha)parallel to(11 (1) over bar)(delta) with [2 (11) over bar0](alpha)parallel to[011](delta) or 2) (0001)(alpha)parallel to(001)(gamma/delta) with [1 (2) over bar 10](alpha)parallel to[110](gamma/delta). Last, we show that the orientation of the basal plane plays a decisive role in the formation of both intragranular and intergranular subsurface hydrides. Statistical analysis of several hundred grain boundaries reveals that grain boundaries with c-axis misorientation of <15 degrees, =55 degrees-60 degrees and >85 degrees are preferential sites for subsurface hydride formation, while those with c-axis misorientations higher than 15 degrees and one grain's basal plane nearly perpendicular to the grain boundary plane resist hydride precipitation. These findings can guide grain boundary engineering efforts for controlling hydrogen damage in Zr. (C) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Keyword :

Precipitation Grain boundary Basal plane Hydride Zirconium

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GB/T 7714 Jia, Yu-Jie , Beyerlein, Irene J. , Han, Wei-Zhong . Precipitation characteristics and distributions of subsurface hydrides in zirconium [J]. | ACTA MATERIALIA , 2021 , 216 .
MLA Jia, Yu-Jie et al. "Precipitation characteristics and distributions of subsurface hydrides in zirconium" . | ACTA MATERIALIA 216 (2021) .
APA Jia, Yu-Jie , Beyerlein, Irene J. , Han, Wei-Zhong . Precipitation characteristics and distributions of subsurface hydrides in zirconium . | ACTA MATERIALIA , 2021 , 216 .
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Revealing the Dynamics of Helium Bubbles Using In Situ Techniques EI SCIE
期刊论文 | 2020 , 72 (6) , 2352-2362 | JOM
WoS CC Cited Count: 1
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As one of the major irradiation defects, helium bubbles have a marked influence on the microstructures and mechanical properties of metals. In recent decades, many experiments and simulations have focused on helium bubbles to reveal their nucleation and growth mechanisms, dynamic evolution under stimulations, and their effects on mechanical properties. With the quick development of various in situ techniques, the abundant dynamic features of helium bubbles have been revealed. In this review, we briefly explore the related researches on the dynamic evolution of helium bubbles under simulated service conditions, such as at high temperatures, under irradiation, and upon mechanical loading. We also discuss the challenges and opportunities in revealing the dynamics of helium bubbles using in situ technologies. This short review intends to advance our understanding of the failure mechanisms of helium-irradiated metals and the basic properties of irradiation-induced helium bubbles.

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GB/T 7714 Liu, Si-Mian , Li, Shi-Hao , Han, Wei-Zhong . Revealing the Dynamics of Helium Bubbles Using In Situ Techniques [J]. | JOM , 2020 , 72 (6) : 2352-2362 .
MLA Liu, Si-Mian et al. "Revealing the Dynamics of Helium Bubbles Using In Situ Techniques" . | JOM 72 . 6 (2020) : 2352-2362 .
APA Liu, Si-Mian , Li, Shi-Hao , Han, Wei-Zhong . Revealing the Dynamics of Helium Bubbles Using In Situ Techniques . | JOM , 2020 , 72 (6) , 2352-2362 .
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