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< Page ,Total 57 >
Twisting of a Pristine alpha-Fe Nanowire: From Wild Dislocation Avalanches to Mild Local Amorphization SCIE PubMed
期刊论文 | 2021 , 11 (6) | NANOMATERIALS
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Abstract :

The torsion of pristine alpha-Fe nanowires was studied by molecular dynamics simulations. Torsion-induced plastic deformation in pristine nanowires is divided into two regimes. Under weak torsion, plastic deformation leads to dislocation nucleation and propagation. Twisting-induced dislocations are mainly 12 screw dislocations in a -oriented nanowire. The nucleation and propagation of these dislocations were found to form avalanches which generate the emission of energy jerks. Their probability distribution function (PDF) showed power laws with mixing between different energy exponents. The mixing stemmed from simultaneous axial and radial dislocation movements. The power-law distribution indicated strongly correlated 'wild' dislocation dynamics. At the end of this regime, the dislocation pattern was frozen, and further twisting of the nanowire did not change the dislocation pattern. Instead, it induced local amorphization at the grip points at the ends of the sample. This "melting" generated highly dampened, mild avalanches. We compared the deformation mechanisms of twinned and pristine alpha-Fe nanowires under torsion.

Keyword :

alpha-Fe nanowire mild wild fluctuations local amorphization plasticity dynamics dislocation avalanche torsion

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GB/T 7714 Yang, Yang , Ding, Xiangdong , Sun, Jun et al. Twisting of a Pristine alpha-Fe Nanowire: From Wild Dislocation Avalanches to Mild Local Amorphization [J]. | NANOMATERIALS , 2021 , 11 (6) .
MLA Yang, Yang et al. "Twisting of a Pristine alpha-Fe Nanowire: From Wild Dislocation Avalanches to Mild Local Amorphization" . | NANOMATERIALS 11 . 6 (2021) .
APA Yang, Yang , Ding, Xiangdong , Sun, Jun , Salje, Ekhard K. H. . Twisting of a Pristine alpha-Fe Nanowire: From Wild Dislocation Avalanches to Mild Local Amorphization . | NANOMATERIALS , 2021 , 11 (6) .
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Hierarchical structure in Al-Cu alloys to promote strength/ductility synergy EI SCIE
期刊论文 | 2021 , 202 | SCRIPTA MATERIALIA
WoS CC Cited Count: 2
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Abstract :

Experimental evidence demonstrated that equal channel angular pressing (ECAP) at cryogenic temperature, in comparison with ECAP at room temperature, led to promoted strength-ductility synergy in an Al-2.5wt.%Cu alloy. The simultaneous improvement is related to microstructural hierarchy of multimodal grains, low angle grain boundaries, and inter/intragranular precipitates, which was tuned by aging treatment in match with the low-temperature ECAP. The artificial aging could maintain multimodal grain size distribution, introduce a large number of low angle grain boundaries and produce intragranular precipitates to improve strength/ductility. A minor 0.3wt.% Sc addition was effective in optimizing the precipitations and further boosting the strength/ductility combination. The underlying mechanisms for higher strength and greater ductility were rationalized in terms of the low-temperature ECAP.& nbsp; (c) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Keyword :

Al-Cu alloy Mechanical properties Microalloying effect Ultrafine-grained Hierarchical microstructure

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GB/T 7714 Wu, S. H. , Xue, H. , Yang, C. et al. Hierarchical structure in Al-Cu alloys to promote strength/ductility synergy [J]. | SCRIPTA MATERIALIA , 2021 , 202 .
MLA Wu, S. H. et al. "Hierarchical structure in Al-Cu alloys to promote strength/ductility synergy" . | SCRIPTA MATERIALIA 202 (2021) .
APA Wu, S. H. , Xue, H. , Yang, C. , Kuang, J. , Zhang, P. , Zhang, J. Y. et al. Hierarchical structure in Al-Cu alloys to promote strength/ductility synergy . | SCRIPTA MATERIALIA , 2021 , 202 .
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Solute cluster evolution during deformation and high strain hardening capability in naturally aged Al-Zn-Mg alloy EI SCIE
期刊论文 | 2021 , 207 | ACTA MATERIALIA
WoS CC Cited Count: 4
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Abstract :

The natural aging (NA) response of a commercial Al-Zn-Mg alloy has been tracked to investigate the effects of solute clusters on its mechanical properties. It has been observed that the increase of yield strength during NA is not accompanied by the degradation of uniform elongation due to the simultaneously enhanced strain hardening ability. As a consequence, the Al-Zn-Mg alloy with dense solute clusters shows a comparable yield strength, better strain hardening ability and uniform tensile strain relative to its artificially aged counterparts containing precipitates. This positive effect of solute clusters on strain hardening has been systematically studied by tracing the microstructure evolution during deformation through synchrotron X-ray diffraction and atom probe tomography. We found that the dislocation multiplication dominates over the entire deformation process until failure in NA alloys; however, no effect of solute clusters on the dislocation density evolution can be identified. On the other hand, solute clusters themselves dramatically evolve, showing a dissolution-to-coarsening transition during deformation, which can be understood on the basis of a kinetic model. The experimental evidence strongly suggest that the dislocation storage and strain-induced evolution of solute clusters are insufficient to account for the observed high strain hardening rate, and the contribution from other possible mechanisms are estimated in a semi-quantitative manner. (C) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Keyword :

Solute clustering Strain hardening 7XXX aluminum alloys Strengthening

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GB/T 7714 Zhang, Peng , Shi, Kunkun , Bian, Jianjun et al. Solute cluster evolution during deformation and high strain hardening capability in naturally aged Al-Zn-Mg alloy [J]. | ACTA MATERIALIA , 2021 , 207 .
MLA Zhang, Peng et al. "Solute cluster evolution during deformation and high strain hardening capability in naturally aged Al-Zn-Mg alloy" . | ACTA MATERIALIA 207 (2021) .
APA Zhang, Peng , Shi, Kunkun , Bian, Jianjun , Zhang, Jinyu , Peng, Yong , Liu, Gang et al. Solute cluster evolution during deformation and high strain hardening capability in naturally aged Al-Zn-Mg alloy . | ACTA MATERIALIA , 2021 , 207 .
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Effect of Si addition on the precipitation and mechanical/electrical properties of dilute Al-Zr-Sc alloys EI SCIE
期刊论文 | 2021 , 812 | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
WoS CC Cited Count: 1
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Abstract :

Microstructural evolution and mechanical/electrical properties of aged Al-0.2 wt%Zr-0.05 wt%Sc alloys with different Si additions (0, 0.05, 0.10 and 0.15 wt%) were comparatively studied by using transmission electron microscopy, electrical conductivity measurements, and microhardness measurements. A significant Si addition effect was demonstrated that the Si addition accelerated the precipitation kinetics and enhanced the heterogeneous precipitation of Al-3(Sc, Zr) nanoparticles. However, both the peak-aging temperature and peak microhardness during isochronal aging were insensitive to the Si addition. The underlying mechanism is related to a partitioning effect of Si among Sc, Zr and vacancy that produces a saturated concentration of Si-vacancy clusters to serve as heterogeneous nuclei. It was further manifested that dual-scale particles, i.e., Al3Zr dispersoids and Al-3(Sc1-xZrx) nanoprecipitates in different length scales, could be produced by deliberately designing the heat treatment protocol. A coupling effect of the dual-scale particles led to an enhanced threshold stress in high-temperature creep testing, indicative of an improved creep resistance promoted by the minor Si addition. Moreover, the recrystallization resistance was seldom affected by Si addition, while slightly improved by introducing dual-scale particles.

Keyword :

Creep resistance Al alloys Recrystallization resistance Dual-scale particles

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GB/T 7714 Wu, S. H. , Xue, H. , Yang, C. et al. Effect of Si addition on the precipitation and mechanical/electrical properties of dilute Al-Zr-Sc alloys [J]. | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING , 2021 , 812 .
MLA Wu, S. H. et al. "Effect of Si addition on the precipitation and mechanical/electrical properties of dilute Al-Zr-Sc alloys" . | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 812 (2021) .
APA Wu, S. H. , Xue, H. , Yang, C. , Cheng, P. M. , Zhang, P. , Kuang, J. et al. Effect of Si addition on the precipitation and mechanical/electrical properties of dilute Al-Zr-Sc alloys . | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING , 2021 , 812 .
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Mechanical properties and deformation mechanisms of a novel fine-grained Mg-Gd-Y-Ag-Zr-Ce alloy with high strength-ductility synergy EI SCIE CSCD
期刊论文 | 2021 , 66 , 64-73 | JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
WoS CC Cited Count: 3
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Abstract :

Grain boundary precipitation and segregation play an important role in determining mechanical properties of Mg alloys. In the present work, we studied work focuses on the strengthening and deformation mechanism of coarse-grained (CG) and fine-grained (FG) Mg-Gd-Y-Ag-Zr-Ce alloy. The CG alloy is strengthened by means of age-strengthening with the formation of both basal plate gamma '' and prismatic plate beta' precipitates in the grain interior. While the strengthening of FC alloy is completed by intergranular alloying segregation and intragranular precipitates gamma '' and beta'. The segregation of alloying elements at the grain boundary and formation of sub-micron particles can stabilize the grain boundary and suppress the intergranular deformation. Consequently, dislocations could be trapped near gamma '' and beta' precipitates in the grain interior. Unlike CG alloys, the FG alloys exhibit a heterogeneous transition from elastic to plastic deformation via the Luders plateau. The rapid gliding dislocation multiplications and fine-grained size are necessary and sufficient conditions for the Luders strains. Our work provides the insights on the evolution of fine-grained microstructure and helps for the design of Mg alloys with good mechanical properties. (C) 2021 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.

Keyword :

Solute segregation Precipitates Magnesium alloys Luders-like deformation

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GB/T 7714 Cui, Xiaofei , Fu, Wei , Fang, Daqing et al. Mechanical properties and deformation mechanisms of a novel fine-grained Mg-Gd-Y-Ag-Zr-Ce alloy with high strength-ductility synergy [J]. | JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY , 2021 , 66 : 64-73 .
MLA Cui, Xiaofei et al. "Mechanical properties and deformation mechanisms of a novel fine-grained Mg-Gd-Y-Ag-Zr-Ce alloy with high strength-ductility synergy" . | JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 66 (2021) : 64-73 .
APA Cui, Xiaofei , Fu, Wei , Fang, Daqing , Bi, Guangli , Ren, Zijun , Guo, Shengwu et al. Mechanical properties and deformation mechanisms of a novel fine-grained Mg-Gd-Y-Ag-Zr-Ce alloy with high strength-ductility synergy . | JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY , 2021 , 66 , 64-73 .
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Research Status and Progress of Welding Technologies for Molybdenum and Molybdenum Alloys SCIE
期刊论文 | 2020 , 10 (2) | METALS
WoS CC Cited Count: 3
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Abstract :

Owing to its potential application prospect in novel accident tolerant fuel, molybdenum alloys and their welding technologies have gained great importance in recent years. The challenges of welding molybdenum alloys come from two aspects: one is related to its powder metallurgy manufacturing process, and the other is its inherent characteristics of refractory metal. The welding of powder metallurgy materials has been associated with issues such as porosity, contamination, and inclusions, at levels which tend to degrade the service performances of a welded joint. Refractory metals usually present poor weldability due to embrittlement of the fusion zone as a result of impurities segregation and the grain coarsening in the heat-affected zone. A critical review of the current state of the art of welding Mo alloys components is presented. The advantages and disadvantages of the various methods, i.e., electron-beam welding (EBW), tungsten-arc inert gas (TIG) welding, laser welding (LW), electric resistance welding (ERW), and brazing and friction welding (FW) in joining Mo and Mo alloys, are discussed with a view to imagine future directions. This review suggests that more attention should be paid to high energy density laser welding and the mechanism and technology of welding Mo alloys under hyperbaric environment.

Keyword :

molybdenum alloy welding progress status

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GB/T 7714 Zhu, Qi , Xie, Miaoxia , Shang, Xiangtao et al. Research Status and Progress of Welding Technologies for Molybdenum and Molybdenum Alloys [J]. | METALS , 2020 , 10 (2) .
MLA Zhu, Qi et al. "Research Status and Progress of Welding Technologies for Molybdenum and Molybdenum Alloys" . | METALS 10 . 2 (2020) .
APA Zhu, Qi , Xie, Miaoxia , Shang, Xiangtao , An, Geng , Sun, Jun , Wang, Na et al. Research Status and Progress of Welding Technologies for Molybdenum and Molybdenum Alloys . | METALS , 2020 , 10 (2) .
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Deformation mechanisms, microstructural evolution and mechanical properties in small-scaled face-centered-cubic metallic thin films EI Scopus
期刊论文 | 2020 , 2 (1) , 58-65
SCOPUS Cited Count: 4
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Abstract :

Metallic thin films have attracted much attention owing to their unique mechanical properties, which are widely used in micro-/nano-devices. In this review, several key topics about the thin films in the micron to nano-scales are covered. First, the plastic deformation mechanisms in face-centered-cubic (FCC) metals, in particular the size-dependent deformation twinning at small scales, are discussed based on a deformation-mechanism map. Microstructural evolution is then briefly discussed from the perspective of the ratio of effective-to-internal stresses, while the stress-driven grain growth is discussed based on a twinning-mediated mechanism. The last section elucidates the size-dependent mechanical properties of metallic thin films, such as yield strength, ductility and mechanical fatigue behavior. © 2019 Chongqing University

Keyword :

Deformation mechanisms; Mechanical properties; Microstructural stability; Size effects; Thin films

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GB/T 7714 Zhang, J. , Liu, G. , Sun, J. . Deformation mechanisms, microstructural evolution and mechanical properties in small-scaled face-centered-cubic metallic thin films [J]. 2020 , 2 (1) : 58-65 .
MLA Zhang, J. et al. "Deformation mechanisms, microstructural evolution and mechanical properties in small-scaled face-centered-cubic metallic thin films" . 2 . 1 (2020) : 58-65 .
APA Zhang, J. , Liu, G. , Sun, J. . Deformation mechanisms, microstructural evolution and mechanical properties in small-scaled face-centered-cubic metallic thin films . 2020 , 2 (1) , 58-65 .
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Formation of wrinkled patterns in metal films deposited on elastic substrates: Tunability and wettability EI SCIE Scopus
期刊论文 | 2019 , 362 , 35-43 | SURFACE & COATINGS TECHNOLOGY
WoS CC Cited Count: 8 SCOPUS Cited Count: 8
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Abstract :

We report the formation of wrinkles with tunable wavelength in Ag films and Mo films deposited on polydimethylsiloxane (PDMS) and PDMS/Si substrates by magnetron sputtering at 50 degrees C. The PDMS-supported Ag films have the wrinkles with mu m-sized wavelength, while the sub-mu m-sized wrinkles are engendered in the Ag films on PDMS/Si substrates due to the constraint from the substrates. By contrary, Mo films with a similar thickness range exhibit wrinkles with mu m-sized wavelength on the PDMS/Si substrates, much larger than that of Ag films on the same substrates. This indicates that the wrinkle wavelength in metal films depends closely on the substrates and the characteristics of metal films. The possible reasons for the discrepancy in wavelength between experiments and theoretical predictions are discussed. The wettability of the wrinkled surfaces is predominantly controlled by the length scale of the wrinkles. In the Ag films with sub-mu m-sized wrinkles, droplet contact angle is highly sensitive to the surface roughness, ie., increasing quickly with the surface roughness. However, in the PDMS-supported Ag and PDMS/Si-supported Mo films both with mu m-sized wrinkles, the contact angle raises slowly with the surface roughness. It is thus evident that a wettability spectrum derived from the wrinkling pattern can be artificially developed by tuning the wavelength in different length scales through controlling of substrates, metal films, and film thicknesses.

Keyword :

Wettability Wrinkles Constraint effect Length scale-dependence Metal films

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GB/T 7714 Li, S. J. , Wu, K. , Yuan, H. Z. et al. Formation of wrinkled patterns in metal films deposited on elastic substrates: Tunability and wettability [J]. | SURFACE & COATINGS TECHNOLOGY , 2019 , 362 : 35-43 .
MLA Li, S. J. et al. "Formation of wrinkled patterns in metal films deposited on elastic substrates: Tunability and wettability" . | SURFACE & COATINGS TECHNOLOGY 362 (2019) : 35-43 .
APA Li, S. J. , Wu, K. , Yuan, H. Z. , Zhang, J. Y. , Liu, G. , Sun, J. . Formation of wrinkled patterns in metal films deposited on elastic substrates: Tunability and wettability . | SURFACE & COATINGS TECHNOLOGY , 2019 , 362 , 35-43 .
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Cohesive and adhesive properties of nanocrystalline Ti thin films on polyimide substrates EI SCIE Scopus
期刊论文 | 2019 , 744 , 746-753 | Materials Science and Engineering A
WoS CC Cited Count: 6 SCOPUS Cited Count: 7
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Abstract :

In this work, cohesive and adhesive properties of Ti thin films on polyimide substrates were studied systematically as a function of grain size by in situ optical microscopy, resistance measurements and synchrotron X-ray diffraction under uniaxial tensile testing. The characteristic of cohesive and adhesive behavior can be well reflected in the stress-strain curves determined by synchrotron X-ray diffraction. Generally, the yield strength decreases while the cracking strain increases with increasing grain size, due to the constraint effect of grain size on dislocation activity. Different from the yield strength, the fracture strength is almost unchanged with grain size. The fracture toughness is found to increase as the grain size increases, which is attributed to the enhanced plasticity during fracture process. Additionally, the interfacial adhesion energy is determined to be 3.8 J m−2. The buckling strain increases with increasing grain size as a result of enhanced plastic dissipation. The formation of patches, instead of buckles, in Ti film with smaller grain size is ascribed to the low deformation capability of the film. © 2018 Elsevier B.V.

Keyword :

Adhesive properties Cohesive property Grain size Synchrotron diffraction Ti thin films

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GB/T 7714 Wu, K. , Xia, Y. , Yuan, H.Z. et al. Cohesive and adhesive properties of nanocrystalline Ti thin films on polyimide substrates [J]. | Materials Science and Engineering A , 2019 , 744 : 746-753 .
MLA Wu, K. et al. "Cohesive and adhesive properties of nanocrystalline Ti thin films on polyimide substrates" . | Materials Science and Engineering A 744 (2019) : 746-753 .
APA Wu, K. , Xia, Y. , Yuan, H.Z. , Zhang, J.Y. , Liu, G. , Sun, J. . Cohesive and adhesive properties of nanocrystalline Ti thin films on polyimide substrates . | Materials Science and Engineering A , 2019 , 744 , 746-753 .
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Two-stage wrinkling of Al films deposited on polymer substrates EI SCIE Scopus
期刊论文 | 2019 , 162 , 456-459 | Scripta Materialia
WoS CC Cited Count: 10 SCOPUS Cited Count: 12
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Abstract :

This study reveals two-stage wrinkling behavior of Al films deposited on polydimethylsiloxane (PDMS) substrates by magnetron sputtering at a high temperature. The hierarchical structures with nano-micro dual scale wrinkles were created in Al films. The micro-scale wrinkles originated from thermal contraction, with the wavelength increasing with increasing film thickness, while nano-scale wrinkles, with an almost unchanged wavelength, are induced by the expansion of the mixed layer on the PDMS surface. The results provide a facile method to produce the hierarchical wrinkled surfaces for functionality. © 2018 Elsevier Ltd

Keyword :

Facile method Hierarchical structures High temperature PDMS surfaces Polydimethylsiloxane (PDMS) substrates Polymer substrate Thermal contraction Wrinkling

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GB/T 7714 Wu, K. , Yuan, H.Z. , Li, S.J. et al. Two-stage wrinkling of Al films deposited on polymer substrates [J]. | Scripta Materialia , 2019 , 162 : 456-459 .
MLA Wu, K. et al. "Two-stage wrinkling of Al films deposited on polymer substrates" . | Scripta Materialia 162 (2019) : 456-459 .
APA Wu, K. , Yuan, H.Z. , Li, S.J. , Zhang, J.Y. , Liu, G. , Sun, J. . Two-stage wrinkling of Al films deposited on polymer substrates . | Scripta Materialia , 2019 , 162 , 456-459 .
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