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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: 9 SCOPUS Cited Count: 10
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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 SCOPUS 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 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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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
SCOPUS Cited Count: 1
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Abstract :

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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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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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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Abstract :

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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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 SCOPUS Cited Count: 5
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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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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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Unraveling the discrepancies in size dependence of hardness and thermal stability in crystalline/amorphous nanostructured multilayers: Cu/Cu-Ti vs. Cu/HfO2 EI SCIE PubMed Scopus
期刊论文 | 2018 , 10 (29) , 14331-14341 | NANOSCALE
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Crystalline/amorphous interfaces (CAIs) confer outstanding mechanical properties on crystalline/amorphous nanostructured multilayers (C/ANMs), which are widely used in micro/nanodevices, because their unique interfacial structure possesses high strain compatibility. In this study, Cu/X (X = Cu-Ti, HfO2) C/ANMs with equal layer thicknesses (h) were comparatively investigated in terms of size-dependent hardness (H) and thermal stability to uncover the fundamental difference(s) between Cu/Cu-Ti and Cu/HfO2. It was found that both as-deposited Cu/Cu-Ti and Cu/HfO2 C/ANMs exhibited a maximum hardness at a critical thickness of h similar to 30 nm, which was caused by a transition from confined dislocation gliding to dislocation transmission across the interface. Specifically, the Cu/Cu-Ti C/ANMs exhibited annealing hardening, whereas the Cu/HfO2 C/ANMs exhibited annealing softening associated with a minimum softening at h similar to 30 nm, which was closely correlated with their thermal stability. In comparison with monolithic amorphous X thin films, the glassy X nanolayers in the present Cu/X C/ANMs exhibited reduced thermal stability and a trend that smaller sizes led to higher stability. The underlying mechanism of the size-dependent crystallization behavior of X nanolayers is discussed in terms of the constraining effects of the interface. These findings provide deep insights into the design of Cu/metallic-glass and Cu/ceramic-glass C/ANMs with optimal performance.

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GB/T 7714 Yue, T. , Wang, Y. Q. , Zhang, J. Y. et al. Unraveling the discrepancies in size dependence of hardness and thermal stability in crystalline/amorphous nanostructured multilayers: Cu/Cu-Ti vs. Cu/HfO2 [J]. | NANOSCALE , 2018 , 10 (29) : 14331-14341 .
MLA Yue, T. et al. "Unraveling the discrepancies in size dependence of hardness and thermal stability in crystalline/amorphous nanostructured multilayers: Cu/Cu-Ti vs. Cu/HfO2" . | NANOSCALE 10 . 29 (2018) : 14331-14341 .
APA Yue, T. , Wang, Y. Q. , Zhang, J. Y. , Wu, K. , Li, G. , Kuang, J. et al. Unraveling the discrepancies in size dependence of hardness and thermal stability in crystalline/amorphous nanostructured multilayers: Cu/Cu-Ti vs. Cu/HfO2 . | NANOSCALE , 2018 , 10 (29) , 14331-14341 .
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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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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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