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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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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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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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Unique mechanical properties of Cu/(NbMoTaW) nanolaminates EI SCIE Scopus
期刊论文 | 2018 , 154 , 154-158 | SCRIPTA MATERIALIA
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Abstract :

Nanostructured face-center-cubic/body-center-cubic Cu/(NbMoTaW) multilayers were prepared with equal layer thickness (h) spanning from 5 to 100 nm. The hardness was found to increase with reducing h to similar to 50 nm, following the Hall-Petch relation. Below this critical thickness, a hardness plateau emerged indicative of an interface barrier strengthening mechanism. The high density of misfit dislocations at interfaces facilitates the yielding of high entropy alloy NbMoTaW layers at stresses far less than the strength of Cu/(NbMoTaW) estimated by rule-of-mixture. Compared with reported multilayers, the present Cu/(NbMoTaW) samples show the size-independent hardness at a larger size-range h < 50 nm. (C) 2018 Acta Materialia Inc Published by Elsevier Ltd. All rights reserved.

Keyword :

Hall-Petch slope High entropy alloys Deformation mechanism Hardness Naonolaminates

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GB/T 7714 Zhao, Y. F. , Wang, Y. Q. , Wu, K. et al. Unique mechanical properties of Cu/(NbMoTaW) nanolaminates [J]. | SCRIPTA MATERIALIA , 2018 , 154 : 154-158 .
MLA Zhao, Y. F. et al. "Unique mechanical properties of Cu/(NbMoTaW) nanolaminates" . | SCRIPTA MATERIALIA 154 (2018) : 154-158 .
APA Zhao, Y. F. , Wang, Y. Q. , Wu, K. , Zhang, J. Y. , Liu, G. , Sun, J. . Unique mechanical properties of Cu/(NbMoTaW) nanolaminates . | SCRIPTA MATERIALIA , 2018 , 154 , 154-158 .
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Ultrastrong Al0.1CoCrFeNi high-entropy alloys at small scales: effects of stacking faults vs. nanotwins EI SCIE PubMed Scopus
期刊论文 | 2018 , 10 (28) , 13329-13334 | NANOSCALE
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Metastability engineering opens a new avenue to design high-entropy alloys (HEAs) originally proposed to benefit from phase stabilization. Meanwhile, boundary engineering via embedding planar defects such as stacking faults and nanotwins into the matrix of metals provides them with unique mechanical properties. In this work, for the first time, we combine the above two strategies to prepare Al0.1CoCrFeNi HEA pillars populated with a high density of stacking faults and nanotwins. It is uncovered that the stacking faulted (SF) Al0.1CoCrFeNi HEA pillars manifest ultrahigh strength exceeding 4.0 GPa and considerable compressive plasticity over 15%, much superior to their nanotwinned (NT) counterparts. Compared with the nanotwins undergoing detwinning during plastic deformation, the stacking faults in Al0.1CoCrFeNi high-entropy alloy thin films (HEAFs) are quite stable to hinder dislocation motion. Our findings not only endow the Al0.1CoCrFeNi HEAs with a predominant combination of strength and compression deformability, but also shed light on a new perspective for overcoming the strength and ductility trade-off in structural materials.

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GB/T 7714 Feng, Xiaobin , Zhang, Jinyu , Wu, Kai et al. Ultrastrong Al0.1CoCrFeNi high-entropy alloys at small scales: effects of stacking faults vs. nanotwins [J]. | NANOSCALE , 2018 , 10 (28) : 13329-13334 .
MLA Feng, Xiaobin et al. "Ultrastrong Al0.1CoCrFeNi high-entropy alloys at small scales: effects of stacking faults vs. nanotwins" . | NANOSCALE 10 . 28 (2018) : 13329-13334 .
APA Feng, Xiaobin , Zhang, Jinyu , Wu, Kai , Liang, Xiaoqing , Liu, Gang , Sun, Jun . Ultrastrong Al0.1CoCrFeNi high-entropy alloys at small scales: effects of stacking faults vs. nanotwins . | NANOSCALE , 2018 , 10 (28) , 13329-13334 .
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Effects of Zr addition on the multi-scale second-phase particles and fracture behavior for Mg-3Gd-1Zn alloy EI SCIE Scopus
期刊论文 | 2018 , 747 , 197-210 | JOURNAL OF ALLOYS AND COMPOUNDS
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Here we report the effects of Zr addition (0.1-0.3 at.%) on the multi-scale second-phase particles and fracture behavior for Mg-3Gd-1Zn (at.%) alloys. Microstructural features of the alloys in the as-cast, solutionized, and aged conditions have been investigated in detail. The results have revealed that the cast alloys are mainly composed of alpha-Mg matrix, eutectic phase (Mg, Zn)(3)Gd, 14H long period stacking ordered (LPSO) structure and cuboid shaped GdH2 phase. After solution heat treatment, the eutectic phase (Mg, Zn)(3)Gd has transformed to X phase with 14H-LPSO structure, which has different distributions and morphologies due to different Zr additions. When the Zr addition is 0.3 at.%, a large amount of microscale Mg(Gd, Zn, Zr) particles appear along the grain boundaries. After aging heat treatment, Mg-3Gd-1Zn alloy with basal precipitates gamma '' exhibits poor age-strengthening response. In contrast, Zr addition to the Mg-3Gd-1Zn alloy gave rise to a strong age-strengthening response. The strength improved significantly due to dense distribution of nanoscale prismatic plate beta' and beta(1) precipitates, which are not observed in the Zr-free alloys. One key finding of this study is that Zr contributes to formation of the prismatic precipitates, and their amount increase with increase of Zr addition. The mechanical damage for these alloys is a sequence of microscale GdH2 or Mg (Gd, Zn, Zr) particles cracking, followed by fracture of the surrounding particles, and finally the growth/coalescence of micronvoids in the alpha-Mg matrix. The fracture of microscale particles was quantitatively analyzed by a Weibull model. (C) 2018 Elsevier B.V. All rights reserved.

Keyword :

Magnesium alloys Precipitates Gd hydrogen particles Fracture mechanism Long-period stacking ordered structure

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GB/T 7714 Fu, W. , Wang, R. H. , Xue, H. et al. Effects of Zr addition on the multi-scale second-phase particles and fracture behavior for Mg-3Gd-1Zn alloy [J]. | JOURNAL OF ALLOYS AND COMPOUNDS , 2018 , 747 : 197-210 .
MLA Fu, W. et al. "Effects of Zr addition on the multi-scale second-phase particles and fracture behavior for Mg-3Gd-1Zn alloy" . | JOURNAL OF ALLOYS AND COMPOUNDS 747 (2018) : 197-210 .
APA Fu, W. , Wang, R. H. , Xue, H. , Kuang, J. , Zhang, J. Y. , Liu, G. et al. Effects of Zr addition on the multi-scale second-phase particles and fracture behavior for Mg-3Gd-1Zn alloy . | JOURNAL OF ALLOYS AND COMPOUNDS , 2018 , 747 , 197-210 .
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Tuning the microstructure and mechanical properties of magnetron sputtered Cu-Cr thin films: The optimal Cr addition EI SCIE Scopus
期刊论文 | 2018 , 151 , 87-99 | ACTA MATERIALIA
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Grain boundary (GB) engineering via alloying opens a pathway to design the interfaces in alloys for tuning their mechanical properties, thus it is quite critical to determine the optimum addition of alloying element. Here, we prepared immiscible Cu-Cr alloyed thin films by non-equilibrium magnetron sputtering deposition to study Cr alloying effects on the microstructure and mechanical properties of Cu thin films. It is found that Cr doping can notably refine the grains and promote the formation of fully nanotwinned columnar grains at low Cr volume concentrations (<=similar to 3.7 at.%) associated with the average GB Cr concentrations <=similar to 15 at.%, beyond which the formation of nanotwins is significantly suppressed. The role of Cr atoms/clusters played in the twinning process is rationalized in terms of dislocation rebound-promotion mechanism. Importantly, a maximum hardness is discovered at the optimum Cr addition of similar to 2.0 at.%. The Cr concentration-dependent hardness of Cu-Cr alloyed films was quantified by a combined strengthening model. The achievement of the maximum hardness was related to the greatest GB solute segregation-induced strength contribution. It is further uncovered that the Cu-Cr system exhibits strain rate sensitivity (SRS, m) monotonically reduced with increasing the Cr concentration, ranging from a positive m of 0.0314 (for pure Cu) to a negative m of -0.0245, which is attributed to a competition between the dislocation-boundary interactions (increasing m) and the dislocation-solute atoms interactions (decreasing m). These findings provide valuable insights into tuning the composition of alloyed thin films to achieve optimized mechanical performance. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Keyword :

Mechanical properties Nanostructured Cu-Cr films Alloying Nanotwins

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GB/T 7714 Li, X. G. , Cao, L. F. , Zhang, J. Y. et al. Tuning the microstructure and mechanical properties of magnetron sputtered Cu-Cr thin films: The optimal Cr addition [J]. | ACTA MATERIALIA , 2018 , 151 : 87-99 .
MLA Li, X. G. et al. "Tuning the microstructure and mechanical properties of magnetron sputtered Cu-Cr thin films: The optimal Cr addition" . | ACTA MATERIALIA 151 (2018) : 87-99 .
APA Li, X. G. , Cao, L. F. , Zhang, J. Y. , Li, J. , Zhao, J. T. , Feng, X. B. et al. Tuning the microstructure and mechanical properties of magnetron sputtered Cu-Cr thin films: The optimal Cr addition . | ACTA MATERIALIA , 2018 , 151 , 87-99 .
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Alloying effects on ductility of nanostructured Cu-X (X = Zr and W) thin films EI SCIE Scopus
期刊论文 | 2018 , 152 , 146-149 | SCRIPTA MATERIALIA
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Alloying effect on tensile ductility of nanostructured Cu-X (X = Zr and W) thin films was studied in comparison. Both Zr and W atoms segregated at grain boundaries (GBs) and increased the GB cohesion energy, leading to similar increase of ductility in as-deposited Cu-X films. After annealing treatment, however, changes in ductility showed different alloying effect: the Cu-Zr one increased while the Cu-W one decreased when compared with their as-deposited counterparts. This discrepancy was rationalized by different microstructural evolution that intergranular CuZr amorphous layer was produced in the Cu-Zr film while intergranular W grains were formed in the Cu-W one. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Keyword :

Nanocrystalline metal Ductility Grain boundary segregation Columnar grains Cu-Zr and Cu-W films

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GB/T 7714 Zhao, J. T. , Zhang, J. Y. , Yuan, H. Z. et al. Alloying effects on ductility of nanostructured Cu-X (X = Zr and W) thin films [J]. | SCRIPTA MATERIALIA , 2018 , 152 : 146-149 .
MLA Zhao, J. T. et al. "Alloying effects on ductility of nanostructured Cu-X (X = Zr and W) thin films" . | SCRIPTA MATERIALIA 152 (2018) : 146-149 .
APA Zhao, J. T. , Zhang, J. Y. , Yuan, H. Z. , Wu, K. , Liu, G. , Sun, J. . Alloying effects on ductility of nanostructured Cu-X (X = Zr and W) thin films . | SCRIPTA MATERIALIA , 2018 , 152 , 146-149 .
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