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< Page ,Total 11 >
Unique buckling and post-buckling behavior of Cu?Zr amorphous films on compliant substrates EI SCIE
期刊论文 | 2019 , 237 , 118-121 | Materials Letters
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Abstract :

The buckling and post-buckling behavior of the Cu–Zr amorphous films is highly dependent on film thickness (h) and applied strain (Ε). A buckling map has been developed with h and Ε as axes, where four buckling modes are detected, including uncracked triangular buckle, cracked rectangular buckle, cracked triangular buckle, and patches. Formation of the four buckling modes will be discussed in terms of the film thickness and size-dependent deformation. © 2018 Elsevier B.V.

Keyword :

Applied strain Buckling and post-buckling Buckling mode Compliant substrates Postbuckling Size dependent deformations Size effects

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GB/T 7714 Wu, K. , Wang, Y.Q. , Yuan, H.Z. et al. Unique buckling and post-buckling behavior of Cu?Zr amorphous films on compliant substrates [J]. | Materials Letters , 2019 , 237 : 118-121 .
MLA Wu, K. et al. "Unique buckling and post-buckling behavior of Cu?Zr amorphous films on compliant substrates" . | Materials Letters 237 (2019) : 118-121 .
APA Wu, K. , Wang, Y.Q. , Yuan, H.Z. , Zhang, J.Y. , Liu, G. , Sun, J. . Unique buckling and post-buckling behavior of Cu?Zr amorphous films on compliant substrates . | Materials Letters , 2019 , 237 , 118-121 .
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Interfacial stress transfer mechanism of Cu-Zr amorphous films on polyimide substrates: Effect of deformation-induced devitrification SCIE
期刊论文 | 2019 , 783 , 841-847 | JOURNAL OF ALLOYS AND COMPOUNDS
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The fragmentation and interfacial stress transfer of Cu75Zr25 amorphous films with varying film thickness (h) on polyimide substrates were systematically investigated by using uniaxial tensile testing, in combination with in situ optical microscope and atomic force microscope characterizations. It is revealed that the interfacial stress transfer length increases monotonically as h increases. The interfacial stress transfer mechanism changes from elastic-plastic to approximately linear elastic at a critical point of h = 250 nm. This is related to h-dependent deformation-induced devitrification (DID) near the interfaces that the thinner Cu-Zr amorphous films display more DID. This study elucidates for the first time the effect of DID on the interfacial stress transfer, which will be helpful to design the interface with desired property for nanotechnological applications. (C) 2019 Elsevier B.V. All rights reserved.

Keyword :

Polyimide substrates Cu-Zr amorphous films Interfacial stress transfer Deformation-induced devitrification Size effect

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GB/T 7714 Wu, K. , Wang, Y. Q. , Yuan, H. Z. et al. Interfacial stress transfer mechanism of Cu-Zr amorphous films on polyimide substrates: Effect of deformation-induced devitrification [J]. | JOURNAL OF ALLOYS AND COMPOUNDS , 2019 , 783 : 841-847 .
MLA Wu, K. et al. "Interfacial stress transfer mechanism of Cu-Zr amorphous films on polyimide substrates: Effect of deformation-induced devitrification" . | JOURNAL OF ALLOYS AND COMPOUNDS 783 (2019) : 841-847 .
APA Wu, K. , Wang, Y. Q. , Yuan, H. Z. , Zhang, J. Y. , Liu, G. , Sun, J. . Interfacial stress transfer mechanism of Cu-Zr amorphous films on polyimide substrates: Effect of deformation-induced devitrification . | JOURNAL OF ALLOYS AND COMPOUNDS , 2019 , 783 , 841-847 .
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Formation of wrinkled patterns in metal films deposited on elastic substrates: Tunability and wettability SCIE
期刊论文 | 2019 , 362 , 35-43 | SURFACE & COATINGS TECHNOLOGY
WoS CC Cited Count: 1
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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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Two-stage wrinkling of Al films deposited on polymer substrates EI SCIE
期刊论文 | 2019 , 162 , 456-459 | Scripta Materialia
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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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Cohesive and adhesive properties of nanocrystalline Ti thin films on polyimide substrates EI SCIE
期刊论文 | 2019 , 744 , 746-753 | Materials Science and Engineering A
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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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Stabilizing nanoprecipitates in Al-Cu alloys for creep resistance at 300 degrees C SCIE
期刊论文 | 2019 , 7 (1) , 18-25 | MATERIALS RESEARCH LETTERS
WoS CC Cited Count: 2
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Abstract :

Commercial precipitation-hardened Al-Cu alloys are normally used at temperatures below its ageing temperature of approximate to 225 degrees C, to avoid thermally induced precipitate coarsening and resultant softening. Making such popular Al alloys creep resistant at or above 300 degrees C is thus challenging. Here we present a modified precipitation protocol, exploiting Sc-microalloying and a carefully designed three-step heat treatment to enhance Sc segregation at the matrix/-Al2Cu precipitate interfaces. The stabilized nanoprecipitates enable an order-of-magnitude reduction in creep rate at 300 degrees C, demonstrating the room for microstructure improvement and the potential for property elevation in traditional engineering alloys through innovative processing coupled with synergetic alloying elements. [GRAPHICS] IMPACT STATEMENTA carefully designed precipitation protocol produces stable nanoprecipitates in Sc-microalloyed Al-Cu alloys, rendering an order-of-magnitude elevation of creep resistance at 300 degrees C.

Keyword :

Al alloys precipitates microalloying interfacial segregation creep resistance

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GB/T 7714 Gao, Y. H. , Yang, C. , Zhang, J. Y. et al. Stabilizing nanoprecipitates in Al-Cu alloys for creep resistance at 300 degrees C [J]. | MATERIALS RESEARCH LETTERS , 2019 , 7 (1) : 18-25 .
MLA Gao, Y. H. et al. "Stabilizing nanoprecipitates in Al-Cu alloys for creep resistance at 300 degrees C" . | MATERIALS RESEARCH LETTERS 7 . 1 (2019) : 18-25 .
APA Gao, Y. H. , Yang, C. , Zhang, J. Y. , Cao, L. F. , Liu, G. , Sun, J. et al. Stabilizing nanoprecipitates in Al-Cu alloys for creep resistance at 300 degrees C . | MATERIALS RESEARCH LETTERS , 2019 , 7 (1) , 18-25 .
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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 :

Crystalline/amorphous nanolaminates Deformation behavior Flow stress Micropillars Size effect

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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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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 :

Deformation mechanism Hall-Petch slope Hardness High entropy alloys 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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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 :

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

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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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Fragmentation and adhesion properties of Cu-Zr amorphous thin films on polyimide substrates SCIE
期刊论文 | 2018 , 98 (10) , 464-472 | PHILOSOPHICAL MAGAZINE LETTERS
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The fragmentation of Cu75Zr25 amorphous films with varying film thickness on polyimide substrates has been investigated by uniaxial tensile testing, in combination with in situ electrical resistivity measurements, optical microscopy and atomic force microscopy. It is revealed that the cracking strain monotonically increases as decreases, which can be attributed to the constraint effect of film thickness on shear band formation and the columnar structures in the thicker films. Similarly, the buckling strain also increases with decreasing , with the delamination of Cu75Zr25 amorphous films following the strain energy criterion. The adhesion energy between Cu75Zr25 film and polyimide is estimated to be of approximate to 6.5J m(-2) based on the buckle geometry.

Keyword :

film thickness effects Cu-Zr amorphous films fragmentation adhesion energy

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GB/T 7714 Wu, K. , Wang, Y. Q. , Yuan, H. Z. et al. Fragmentation and adhesion properties of Cu-Zr amorphous thin films on polyimide substrates [J]. | PHILOSOPHICAL MAGAZINE LETTERS , 2018 , 98 (10) : 464-472 .
MLA Wu, K. et al. "Fragmentation and adhesion properties of Cu-Zr amorphous thin films on polyimide substrates" . | PHILOSOPHICAL MAGAZINE LETTERS 98 . 10 (2018) : 464-472 .
APA Wu, K. , Wang, Y. Q. , Yuan, H. Z. , Zhang, J. Y. , Liu, G. , Sun, J. . Fragmentation and adhesion properties of Cu-Zr amorphous thin films on polyimide substrates . | PHILOSOPHICAL MAGAZINE LETTERS , 2018 , 98 (10) , 464-472 .
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