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Stable nanocrystalline NbMoTaW high entropy alloy thin films with excellent mechanical and electrical properties EI SCIE Scopus
期刊论文 | 2018 , 210 , 84-87 | MATERIALS LETTERS
WoS CC Cited Count: 7
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Abstract :

In this work, we systematically investigated the hardness, electrical resistance and thermal stability of nanocrystalline NbMoTaW high entropy alloy films with thickness varying from about 100 to 2000 nm. The nanocrystalline high entropy alloy film exhibited the peak hardness (similar to 16.0 GPa), strong size-independent electrical resistance (similar to 170 mu Omega.cm) as well as stabilized single phase body-centered cubic (BCC) structure even after exposed to vacuum annealing at 800 degrees C for 2 h. In the meantime, we provide reasonable insights into understanding behaviors above. With superior mechanical and electrical properties as well as good thermal stability, this kind of refractory nanocrystalline HEAFs will find extensive potential applications. (C) 2017 Elsevier B.V. All rights reserved.

Keyword :

Thermal stability High entropy alloys Nanocrystalline Thin films Electrical properties Hardness

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GB/T 7714 Feng, Xiaobin , Zhang, Jinyu , Xia, Ziren et al. Stable nanocrystalline NbMoTaW high entropy alloy thin films with excellent mechanical and electrical properties [J]. | MATERIALS LETTERS , 2018 , 210 : 84-87 .
MLA Feng, Xiaobin et al. "Stable nanocrystalline NbMoTaW high entropy alloy thin films with excellent mechanical and electrical properties" . | MATERIALS LETTERS 210 (2018) : 84-87 .
APA Feng, Xiaobin , Zhang, Jinyu , Xia, Ziren , Fu, Wei , Wu, Kai , Liu, Gang et al. Stable nanocrystalline NbMoTaW high entropy alloy thin films with excellent mechanical and electrical properties . | MATERIALS LETTERS , 2018 , 210 , 84-87 .
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Nanoindentation creep behavior of Cu-Zr metallic glass films SCIE Scopus
期刊论文 | 2018 , 6 (1) , 22-28 | MATERIALS RESEARCH LETTERS
WoS CC Cited Count: 2
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Abstract :

The size-dependent hardness, strain-rate sensitivity (SRS) and shear transformation zone (STZ) volume of co-sputtered Cu-Zr metallic glass films with film thickness h spanning from 1000 to 3000 nm were systematically investigated by nanoindentation creep tests at room temperature. Experimental results manifested an exceptional decrease in hardness and a monotonic increment in SRS (or a monotonic decline in STZ volume) with reducing h. The deformation mechanism could be rationalized in light of more free volume combined with smaller STZs in thinner films, which likely trigger the strain-softening behavior. Moreover, STZs and deformation-induced devitrification promote the homogeneous-like plastic flow. IMPACT STATEMENT Employing nanoindentation creep tests revealed size-dependent hardness and strain-rate sensitivity in metallic glass films, enabling comprehensive understanding of the deformation mechanism based on atomic-scale shear transformation zone theory.

Keyword :

strain-rate sensitivity nanoindentation hardness Metallic glass films

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GB/T 7714 Wang, Yaqiang , Zhang, Jinyu , Wu, Kai et al. Nanoindentation creep behavior of Cu-Zr metallic glass films [J]. | MATERIALS RESEARCH LETTERS , 2018 , 6 (1) : 22-28 .
MLA Wang, Yaqiang et al. "Nanoindentation creep behavior of Cu-Zr metallic glass films" . | MATERIALS RESEARCH LETTERS 6 . 1 (2018) : 22-28 .
APA Wang, Yaqiang , Zhang, Jinyu , Wu, Kai , Liu, Gang , Kiener, Daniel , Sun, Jun . Nanoindentation creep behavior of Cu-Zr metallic glass films . | MATERIALS RESEARCH LETTERS , 2018 , 6 (1) , 22-28 .
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The influence of Sc solute partitioning on ductile fracture of Sc-microalloyed Al-Cu alloys EI SCIE Scopus
期刊论文 | 2018 , 717 , 113-123 | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
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Abstract :

Al-XCu (X = 1.0, 1.5, and 2.5 wt%) alloys with and without 0.3 wt% Sc addition were prepared respectively. The effects of composition and heat treatment processes on the microstructural evolution were systematically investigated by using transmission electron microscope and atom probe tomography (APT). Both Al3Sc dispersoids and theta'-Al2Cu precipitates coexisted after artificial aging, and a strong Sc segregation at theta'-Al2Cu/matrix interfaces was detected and quantified through APT examinations. A Sc solute partitioning was demonstrated between in the Al3Sc dispersoids and at the theta'-Al2Cu/matrix interfaces, mediated by the Cu content. Increasing the Cu content, both the size and volume fraction of the Al3Sc decreased after solid solution treatment. As a result, the interfacial Sc segregation was accordingly intensified during subsequent aging treatment. A parameter of reduction in interfacial energy (Delta gamma), derived from APT analyses, was proposed to characterize the degree of interfacial Sc segregation. The coupling effect of Al3Sc dispersoids and theta'-Al2Cu precipitates on ductile fracture was discussed, where a micromechanical model was developed to describe a quantitative relationship between the fracture strain with Delta gamma as well as parameters of the Al3Sc dispersoids.

Keyword :

Aluminum alloys Microalloying effect Interfacial segregation Ductile fracture Solute partitioning

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GB/T 7714 Yang, C. , Shao, D. , Zhang, P. et al. The influence of Sc solute partitioning on ductile fracture of Sc-microalloyed Al-Cu alloys [J]. | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING , 2018 , 717 : 113-123 .
MLA Yang, C. et al. "The influence of Sc solute partitioning on ductile fracture of Sc-microalloyed Al-Cu alloys" . | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 717 (2018) : 113-123 .
APA Yang, C. , Shao, D. , Zhang, P. , Gao, Y. H. , Zhang, J. Y. , Kuang, J. et al. The influence of Sc solute partitioning on ductile fracture of Sc-microalloyed Al-Cu alloys . | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING , 2018 , 717 , 113-123 .
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Alloying effects on the microstructure and mechanical properties of nanocrystalline Cu-based alloyed thin films: Miscible Cu-Ti vs immiscible Cu-Mo EI SCIE Scopus
期刊论文 | 2018 , 143 , 55-66 | ACTA MATERIALIA
WoS CC Cited Count: 4
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Abstract :

Tuning the microstructure to optimize the mechanical performance of nanocrystalline Cu thin films via the alloying strategy is quite important for their application in microdevices. In this work, we prepared nanocrystalline miscible Cu-Ti and immiscible Cu-Mo alloyed thin films to investigate alloying effects on the microstructure and mechanical properties of Cu thin films in terms of mixing enthalpies. It is found that the dopants of both Ti and Mo can notably refine the grains, and in particular promote the formation of nanotwins below a critical content of solute, beyond which the formation of nanotwins is notably suppressed. The nonmonotonic solute concentration-dependent twinning behavior observed in Cu-Ti and Cu-Mo alloyed thin films is explained by the coupling effects between grain size and grain boundary segregated dopants that affects the stimulated slip process of partials. The increased hardness of both Cu-Ti and Cu-Mo systems with increasing the solute contents are quantitatively explained by combining several strengthening mechanisms, including solid solution strengthening, grain/twin boundary (GB/TB) strengthening, solute segregation-induced strengthening. It unexpectedly appears that with increasing the solute contents, the Cu-Ti system exhibits monotonically reduced positive strain rate sensitivity (SRS, m), whereas the Cu-Mo system manifests almost constant negative SRS. The fundamental difference in SRS m between Cu-Ti and Cu-Mo is rationalized in terms of the interactions between solute atomic clusters and dislocations based on the cross-core diffusion mechanism. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Keyword :

Alloying Mechanical properties Nanocrystalline Cu thin films Dislocations Grain boundary segregation

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GB/T 7714 Zhang, J. Y. , Zhao, J. T. , Li, X. G. et al. Alloying effects on the microstructure and mechanical properties of nanocrystalline Cu-based alloyed thin films: Miscible Cu-Ti vs immiscible Cu-Mo [J]. | ACTA MATERIALIA , 2018 , 143 : 55-66 .
MLA Zhang, J. Y. et al. "Alloying effects on the microstructure and mechanical properties of nanocrystalline Cu-based alloyed thin films: Miscible Cu-Ti vs immiscible Cu-Mo" . | ACTA MATERIALIA 143 (2018) : 55-66 .
APA Zhang, J. Y. , Zhao, J. T. , Li, X. G. , Wang, Y. Q. , Wu, K. , Liu, G. et al. Alloying effects on the microstructure and mechanical properties of nanocrystalline Cu-based alloyed thin films: Miscible Cu-Ti vs immiscible Cu-Mo . | ACTA MATERIALIA , 2018 , 143 , 55-66 .
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Size dependence of buckling strains of Cr films, Cu films and Cu/Cr multilayers on compliant substrates EI SCIE Scopus
期刊论文 | 2018 , 146 , 1-4 | SCRIPTA MATERIALIA
WoS CC Cited Count: 3
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Abstract :

The buckling strain epsilon(B) of Cr films and Cu films exhibits opposite film thickness h dependence: the CB of Cr films decreases monotonically, while the epsilon(B) of Cu films increases monotonically with the increasing h. The delamination of Cr films follows the strain energy criterion while the Cu films are buckle-limited. The epsilon(B) of Cu/Cr nano structured metallic multilayers (NMMs), much higher than that of Cr films, increases as the modulation period lambda increases. A modified strain energy criterion involving interfacial adhesion and plastic deformation has been developed to describe the evolution of epsilon(B) of Cu/Cr NMMs with lambda. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Keyword :

Cu/Cr multilayers Cu films Size effect Cr films Buckling strain

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GB/T 7714 Wu, K. , Yuan, H. Z. , Liang, X. Q. et al. Size dependence of buckling strains of Cr films, Cu films and Cu/Cr multilayers on compliant substrates [J]. | SCRIPTA MATERIALIA , 2018 , 146 : 1-4 .
MLA Wu, K. et al. "Size dependence of buckling strains of Cr films, Cu films and Cu/Cr multilayers on compliant substrates" . | SCRIPTA MATERIALIA 146 (2018) : 1-4 .
APA Wu, K. , Yuan, H. Z. , Liang, X. Q. , Zhang, J. Y. , Liu, G. , Sun, J. . Size dependence of buckling strains of Cr films, Cu films and Cu/Cr multilayers on compliant substrates . | SCRIPTA MATERIALIA , 2018 , 146 , 1-4 .
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The effect of precipitates on voiding, twinning, and fracture behaviors in Mg alloys EI SCIE Scopus
期刊论文 | 2018 , 720 , 98-109 | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
WoS CC Cited Count: 1
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Abstract :

The effect of precipitates on fracture behaviors was comparatively investigated among three kinds of Mg alloys with different precipitates, i.e., Mg-Gd alloy with prismatic plate-shaped precipitates, Mg-Zn alloy with [0001](alpha) rod-shaped precipitates, and Mg-Gd-Zn-Zr alloy with basal plate-shaped precipitates. By comparing the fracture behaviors of the alloys before and after aging treatment, it was evident that the presence of precipitates greatly promoted the formation of microvoids that were initiated at primary intermetallic particles. Voiding was the most accelerated in the Mg-Gd alloy, where the precipitate-dislocation interactions are the strongest. While in the Mg-Gd-Zn-Zr alloy with the weakest precipitate hardening, the precipitate-facilitated voiding was the least significant. The precipitate-dependent voiding suppressed the twinning behaviors, causing the volume fraction of deformation twins decreased in turn from Mg-Gd-Zn-Zr to Mg-Zn, and finally to Mg-Gd alloys. The tensile ductility of present Mg alloys approximately scaled with the volume fraction of deformation twins, and was highly sensitive to the precipitates. The fracture scenario of present Mg alloys was proposed that the voiding suppressed twinning and the competition between voiding and twinning can be mediated by precipitates. In the Mg-Gd-Zn-Zr alloy with limited voiding, the twinning dominated the deformation process and concomitantly resulted in a great ductility. The formation of microvoids or the fracture of primary intermetallic particles was quantitatively analyzed by applying a Weibull model, where both the alloy strength and the volume fraction of primary intermetallic particles were considered to rationalize the remarkable difference in fracture behaviors among the present three Mg alloys. Furthermore, the coupling contribution of precipitates and twins to the work hardening was modelled in the aged Mg-Gd-Zn-Zr alloy that displayed a large room temperature tensile ductility of similar to 13.5%.

Keyword :

Magnesium alloys Precipitates Twin Fracture mechanism Ductility

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GB/T 7714 Fu, Wei , Wang, Ruihong , Zhang, Jinyu et al. The effect of precipitates on voiding, twinning, and fracture behaviors in Mg alloys [J]. | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING , 2018 , 720 : 98-109 .
MLA Fu, Wei et al. "The effect of precipitates on voiding, twinning, and fracture behaviors in Mg alloys" . | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 720 (2018) : 98-109 .
APA Fu, Wei , Wang, Ruihong , Zhang, Jinyu , Wu, Kai , Liu, Gang , Sun, Jun . The effect of precipitates on voiding, twinning, and fracture behaviors in Mg alloys . | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING , 2018 , 720 , 98-109 .
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The W alloying effect on thermal stability and hardening of nanostructured Cu-W alloyed thin films EI SCIE PubMed Scopus
期刊论文 | 2018 , 29 (19) | NANOTECHNOLOGY
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Abstract :

In order to achieve desired mechanical properties of alloys by manipulating grain boundaries (GBs) via solute decoration, it is of great significance to understand the underlying mechanisms of microstructural evolution and plastic deformation. In this work, nanocrystalline (NC) Cu-W alloyed films with W concentrations spanning from 0 to 40 at% were prepared by using magnetron sputtering. Thermal stability (within the temperature range of 200 degrees C-600 degrees C) and hardness of the films were investigated by using the x-ray diffraction, transmission electron microscope (TEM) and nanoindentation, respectively. The NC pure Cu film exhibited substantial grain growth upon all annealing temperatures. The Cu-W alloyed films, however, displayed distinct microstructural evolution that depended not only on the W concentration but also on the annealing temperature. At a low temperature of 200 degrees C, all the Cu-W alloyed films were highly stable, with unconspicuous change in grain sizes. At high temperatures of 400 degrees C and 600 degrees C, the microstructural evolution was greatly controlled by the W concentrations. The Cu-W films with low W concentration manifested abnormal grain growth (AGG), while the ones with high W concentrations showed phase separation. TEM observations unveiled that the AGG in the Cu-W alloyed thin films was rationalized by GB migration. Nanoindentation results showed that, although the hardness of both the as-deposited and annealed Cu-W alloyed thin films monotonically increased with W concentrations, a transition from annealing hardening to annealing softening was interestingly observed at the critical W addition of similar to 25 at%. It was further revealed that an enhanced GB segregation associated with detwinning was responsible for the annealing hardening, while a reduced solid solution hardening for the annealing softening.

Keyword :

thermal stability hardening W alloying effect nanostructured Cu-W films grain boundary segregation

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GB/T 7714 Zhao, J. T. , Zhang, J. Y. , Hou, Z. Q. et al. The W alloying effect on thermal stability and hardening of nanostructured Cu-W alloyed thin films [J]. | NANOTECHNOLOGY , 2018 , 29 (19) .
MLA Zhao, J. T. et al. "The W alloying effect on thermal stability and hardening of nanostructured Cu-W alloyed thin films" . | NANOTECHNOLOGY 29 . 19 (2018) .
APA Zhao, J. T. , Zhang, J. Y. , Hou, Z. Q. , Wu, K. , Feng, X. B. , Liu, G. et al. The W alloying effect on thermal stability and hardening of nanostructured Cu-W alloyed thin films . | NANOTECHNOLOGY , 2018 , 29 (19) .
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Grain size-dependent Sc microalloying effect on the yield strength-pitting corrosion correlation in Al-Cu alloys EI SCIE Scopus
期刊论文 | 2018 , 721 , 200-214 | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
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Coarse-grained (CG), fine-grained (FG), and ultrafine-grained (UFG) Al-2.5 wt% Cu (Al-Cu) alloys were respectively prepared, with and without 0.3 wt% Sc addition, for comparison. The influences of minor Sc addition on the microstructural evolution, tensile mechanical properties and pitting corrosion resistance were system. atically studied at different grain scales. A significant Sc microalloying effect on the precipitation was observed that the minor Sc addition promoted the dispersion of finer theta'-Al2Cu precipitates in the CG alloy and favored the intragranular theta'-Al2Cu precipitation in the FG and UFG alloys, with the smaller grain size leading to a stronger Sc microalloying effect. The Sc addition induced convincing increases in the yield strength at all the three grain scales, and improved (in the CG and UFG Al-Cu alloys) or retained (in the FG Al-Cu alloy) the pitting corrosion resistance at the same time. This indicates that the inverse strength-pitting corrosion correlation as usually observed can be broken by minor Sc addition. The strengthening mechanisms were discussed and the grain size dependent pitting corrosion resistance mediated by the Sc addition was rationalized in terms of a competition between the positive influence derived from the interfacial Sc segregation and the negative influence come from the deformation-induced dislocations. The present findings provide a possible approach to break the inverse strength-pitting resistance correlation in heat-treatable Al alloys by modifying the precipitate/matrix interfaces through the suitable microalloying atom segregation.

Keyword :

Al alloys Strength and corrosion Grain size effect Interfacial segregation Microalloying

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GB/T 7714 Wu, S. H. , Zhang, P. , Shao, D. et al. Grain size-dependent Sc microalloying effect on the yield strength-pitting corrosion correlation in Al-Cu alloys [J]. | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING , 2018 , 721 : 200-214 .
MLA Wu, S. H. et al. "Grain size-dependent Sc microalloying effect on the yield strength-pitting corrosion correlation in Al-Cu alloys" . | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 721 (2018) : 200-214 .
APA Wu, S. H. , Zhang, P. , Shao, D. , Cheng, P. M. , Kuang, J. , Wu, K. et al. Grain size-dependent Sc microalloying effect on the yield strength-pitting corrosion correlation in Al-Cu alloys . | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING , 2018 , 721 , 200-214 .
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Fiber Laser Welding of Fuel Cladding and End Plug Made of La2O3 Dispersion-Strengthened Molybdenum Alloy EI SCIE PubMed Scopus
期刊论文 | 2018 , 11 (7) | MATERIALS
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The study investigated the laser lap welding of fuel cladding and end plug made of molybdenum (Mo) alloy. The research results showed that the tensile strength of the welded joint when a weld was located at the Mo tube was significantly larger than that at the fit-up gap between the fuel cladding and end plug. Moreover, preheating can also greatly increase the tensile strength of the lap joint. The weld zone was filled with bulky coarse columnar crystal structures while there were numerous coarse recrystallized structures in the heat affected zone (HAZ). The weld zone and HAZ were both subjected to a significant softening. The tensile strength and elongation rate of fuel cladding made of Mo alloy were about 750 MPa and 36.7%, respectively. The welded joint did not undergo any plastic deformation during the tensile process and presented a brittle fracture. Under the optimum processing conditions, the tensile strength of the welded joint reached 617 MPa, taking up 82.3% that of the base metal. The results of composition analysis indicated that there was only Mo inside the columnar crystals in weld zone while significant oxygen segregation was observed at the grain boundary. This was the main reason causing that the strength of welded joint was lower than that of the base metal. Additionally, under the optimum processing conditions, there were numerous slender columnar crystals on the cross section of the joint entering the weld zone in fuel cladding side from that in end plug side where the crystals were nucleated and grew upwards. The analysis results suggested that the presence of these slender columnar crystals crossing the interface between fuel cladding and end plug was favorable for improving the capacity of the joint for bearing the shear loads.

Keyword :

molybdenum alloy lap joint fuel cladding laser welding end plug

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GB/T 7714 An, Geng , Sun, Jun , Sun, Yuanjun et al. Fiber Laser Welding of Fuel Cladding and End Plug Made of La2O3 Dispersion-Strengthened Molybdenum Alloy [J]. | MATERIALS , 2018 , 11 (7) .
MLA An, Geng et al. "Fiber Laser Welding of Fuel Cladding and End Plug Made of La2O3 Dispersion-Strengthened Molybdenum Alloy" . | MATERIALS 11 . 7 (2018) .
APA An, Geng , Sun, Jun , Sun, Yuanjun , Cao, Weicheng , Zhu, Qi , Bai, Qinglin et al. Fiber Laser Welding of Fuel Cladding and End Plug Made of La2O3 Dispersion-Strengthened Molybdenum Alloy . | MATERIALS , 2018 , 11 (7) .
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From size-dependent strengthening to softening in nanolaminated Cu/Cu-Zr crystalline/amorphous micropillars EI SCIE Scopus
期刊论文 | 2018 , 732 , 29-34 | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
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Microcompressive tests were performed to investigate the intrinsic modulation effect and extrinsic diameter effect on strength and deformation behaviors of nanolaminated Cu/Cu-Zr crystalline/amorphous micropillars within a diameter D range from 300 to 1500 nm as well as a modulation ratio eta range from 0.1 to 3.0. Experimental results revealed a transition of D-dependent deformation mode from homogeneous-like to shear localization at large eta, while D-independent homogeneous extrusion of Cu at small eta. Furthermore, the flow strength increased with raising D at small eta, but decreased at large eta, exhibiting a D-insensitive strength at a critical eta* similar to 0.5. These unusual results were rationalized in terms of a coupling effect of dislocation actions and shear transformation zone mediated operations.

Keyword :

Size effect Flow stress Crystalline/amorphous nanolaminates Deformation behavior Micropillars

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GB/T 7714 Wang, Y. Q. , Liang, X. Q. , Wu, K. et al. From size-dependent strengthening to softening in nanolaminated Cu/Cu-Zr crystalline/amorphous micropillars [J]. | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING , 2018 , 732 : 29-34 .
MLA Wang, Y. Q. et al. "From size-dependent strengthening to softening in nanolaminated Cu/Cu-Zr crystalline/amorphous micropillars" . | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 732 (2018) : 29-34 .
APA Wang, Y. Q. , Liang, X. Q. , Wu, K. , Zhang, J. Y. , Liu, G. , Sun, J. . From size-dependent strengthening to softening in nanolaminated Cu/Cu-Zr crystalline/amorphous micropillars . | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING , 2018 , 732 , 29-34 .
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