CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yue Shen,Zheng Li,Ying Liu,Jing Tao Wang
Polyvinylidene fluoride (PVDF) has attracted significant attention for its unique piezoelectric and ferroelectric properties. However, traditional processing primarily results in the non-polar α phase, limiting its applications. This study prepared PVDF films via solution casting followed by rolling at various temperatures to promote the transition to the β phase. High-temperature rolling significantly enhanced the β phase content, improved the microstructure and orientation of the films, and markedly enhanced the piezoelectric and ferroelectric properties. Particularly, the films rolled at 90 °C exhibited a higher relative content of the β phase, showing exceptional piezoelectric performance with a d 33 value of 26 pC/N and ferroelectric properties with a remanent polarization (P r ) of 13.69 μC/cm 2 . Additionally, hot rolling at higher temperatures notably improved the mechanical properties, enhancing both tensile strength and elongation at break. The optimized PVDF films present broad application prospects in areas such as sensors. This study provides a method and theoretical guidance for the preparation of high-performance PVDF-based functional materials.
研究领域:
材料科学
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传感器技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Chongyang Tao,Lanyun Li,Ni He,Guodong Sun,Chengze Liu,Junjie Xu,Mingyang Li,Longlong Dong,Yusheng Zhang,Lianwen Wang,Mingjia Li
In this study, low energy ball milling and spark plasma sintering techniques prepared the in-situ synthesized Ti 5 Si 3 reinforced Ti-6Al-4V (TC4) matrix composites and then rolled them at high temperatures. In the composites with high Si content, the Ti 5 Si 3 particles distributed at the interface of α-phase and β-phase agglomerated and then formed a quasi-continuous network structure, which will deteriorate the plasticity of the composites. After hot rolling, the grains of the composite were significantly refined, and more Ti 5 Si 3 particles were precipitated. With the increase in Si content, the tensile strength of sintered composites increased slightly, but the elongation decreased greatly. After hot rolling, the tensile strength of the composite increased significantly with an increment of 359.4 MPa, among which the composite with 0.6 wt% Si achieved a synchronous increase in strength and plasticity. The strengthening mechanism of sintered composites included dislocation strengthening, solution strengthening, and grain refinement, among which dislocation strengthening and grain refinement were the main strengthening mechanisms. The strengthening mechanism of rolled composites was mainly the dislocation strengthening caused by rolling, the grain refinement, and the mismatch of thermal expansion coefficient.
研究领域:
材料科学
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机械工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2021
·
IF 3.871
S. Miao,Y. Lin,Y.Q. Zhao,Z.M. Xie
This work described an experimental investigation on the recrystallization behaviors of the hot-rolled particle strengthened W (PSW) material. Upon annealing, the three processes, that is, recovery, recrystallization and grain growth, proceed in a discontinuous fashion for our PSW material, and two or more processes could simultaneously occur in local regions. At an annealing temperature spanning from 1300 °C to 1500 °C, recovery is in the dominant position which is verified by deformed grains over half of the whole, accompanying with a gentle decrease in hardness. Meanwhile, recrystallization nucleation, primary recrystallization and abnormal grain growth is identified at 1300 °C, 1400 °C and 1500 °C, respectively. Further increasing the annealing temperature to 1600 °C and 1700 °C, normal grain growth takes precedence over recovery, along with a marked reduction in hardness. TEM observations show that owing to microstructural heterogeneity induced by particle dispersion, local regions have an advantage in terms of strain energy storage over other regions during hot rolling, enabling a preferential recrystallization nucleation at 1300 °C; whereas nanosized TiC particles are capable of inhibiting grain growth at elevated temperature, and thus retard the recrystallization rate. In addition, our as-rolled PSW material exhibits a different texture, and the dominant α-fiber of {100}〈011〉 and {112}〈1−10〉 transforms into γ-fiber texture of {111}〈011〉 and {111}〈−1−12〉 during recrystallization.
研究领域:
材料科学
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金属学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
·
2018
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IF 3.414
Bowen Pu,Junwei Sha,Enzuo Liu,Chunnian He,Naiqin Zhao
Traditional laminated metal matrix composites are confined to two-component system of pure metal matrix and its reinforcement. To achieve further improvement of the applied mechanical properties , in this work, the soft phase of laminated composites was enhanced by alloying with Cu. The synergistic effect of Cu on phases of both soft and hard including in-situ catalyzing and precipitation hardening was firstly explored. The laminated graphene nanosheets (GNSs) /AlCu composites of 2 vol% GNSs, were fabricated by ball milling and hot-rolling processes with much higher mechanical properties. The multi-pass hot rolling provided the solution-precipitation process of Cu transforming into Al 2 Cu and significantly increased the dislocation density of the original soft Al matrix. In addition, the fracture mechanism and fracture model of the laminated GNSs/AlCu composites were also investigated.
研究领域:
材料科学
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力学
✓ 已验证
产品关联
DOI
高影响因子
Frontiers of Materials Science
·
2015
·Vol. 10
·期 1
·73-79
·
IF 1
Gao Rui,Ge Wen-jun,Miao Shu,Zhang Tao,Wang Xian-ping,Fang Qian-feng
The grain morphology, nano-oxide particles and mechanical properties of oxide dispersion strengthened (ODS)-316L austenitic steel synthesized by electron beam selective melting (EBSM) technique with different post-working processes, were explored in this study. The ODS-316L austenitic steel with superfine nano-sized oxide particles of 30–40 nm exhibits good tensile strength (412 MPa) and large total elongation (about 51%) due to the pinning effect of uniform distributed oxide particles on dislocations. After hot rolling, the specimen exhibits a higher tensile strength of 482 MPa, but the elongation decreases to 31.8% owing to the introduction of high-density dislocations. The subsequent heat treatment eliminates the grain defects induced by hot rolling and increases the randomly orientated grains, which further improves the strength and ductility of EBSM ODS-316L steel.
研究领域:
材料科学
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冶金工程
✓ 已验证
DOI
高影响因子
Nano Materials Science
·
2024
·
IF 12.6
Sang Xiong,Chenyi Yan,Yue Qi
A solvothermal approach was used to generate N-doped graphene oxide quantum dots (NGOQDs) using MoS 2 and Al 2 O 3 nanocomposites. Through the use of TEM, XRD, Raman, ATR-FTIR, and XPS, the produced composites' shape, composition, and structure were described. Tribological behavior and lubrication properties of NGOQDs-MoS 2 and NGOQDs-Al 2 O 3 nanocomposites as additive in nanofluids during hot roll cladding of copper and steel were studied and rolling lubrication mechanism was disclosed. The outcome demonstrates that tribological performance may be greatly enhanced by combining NGOQDs, and surface quality of the rolled copper and steel, and the addition of NGOQDs-MoS 2 and NGOQDs-Al 2 O 3 nanoparticles can further improve the hot-rolling lubrication properties. The tribofilm, formed through the tribochemically induced lubrication process, significantly enhances the wear and corrosion resistance of rolled copper and steel surfaces.
研究领域:
材料科学
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机械工程
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表面工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Manufacturing Processes
·
2020
·
IF 4.086
Jiaqi He,Jianlin Sun,Yanan Meng,Yu Pei
The novel composite material MoS 2 -Al 2 O 3 nanoparticles were synthesized via mussel-inspired chemistry of dopamine. Hot rolling lubrication performance of MoS 2 -Al 2 O 3 in water-based fluid was evaluated using a two-high rolling mill. Results showed that the synthesized MoS 2 -Al 2 O 3 nanofluid exhibited optimum hot rolling lubrication performance. The finish rolling thickness and rolled surface roughness reached lowest. Meanwhile the rolling force and oxide scale thickness of strips were respectively reduced by 26.9 % and 54.2 % compared with base-fluid lubricating condition. The ratio of Fe 2 O 3 in oxide scale has lowered when rolled with nanofluids, owing to the antioxidation effect of nanoparticles during lubrication. MoS 2 has partially oxidized to MoO 3 and the excellent lubrication performance of MoS 2 -Al 2 O 3 nanofluid resulted from the lubricating film formed by these three nanoparticles.
研究领域:
材料科学
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机械工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
POLYMER ENGINEERING AND SCIENCE
·
2023
·Vol. 63
·期 8
·2409-2420
·
IF 3.2
Jia Li,Lang Zhou,Shuang Liu
A novel smart material is developed, which is synthesized by succinic anhydride, epoxy resin, and zinc acetylacetone hydrate. The smart material has excellent properties of self-healing, shape memory, and degradation. The experimental results of performance characterization show that the material has good thermal stability. The glass transition temperature is adjustable between 100 and 120°C, and the storage modulus can reach 20 GPa. The maximum thermal expansion at 50°C is less than 15%, the thermal expansion equilibrium time at 120°C is less than 5 min, and the maximum thermal expansion is 131%. The stress relaxation time at 120°C is more than 2 h, which can slowly self-heal on the basis of maintaining the mechanical strength. When the NaOH content is 1.5%, the degradation equilibrium can be reached in about 3 h, and the maximum degradation rate is 86%. The comprehensive performance evaluation shows that after hot rolling at 120°C/16 h, the material has no effect on the rheology and filtration properties. When plugging the fracture width of 5 × 4 mm, the pressure bearing capacity reaches 10 MPa. Its main mechanism is temperature-sensitive expansion, and the stress relaxation effect heals and blocks the micro pore throat.
研究领域:
材料科学
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化学工程
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石油工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）