MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
·
2022
·
IF 6.044
Peibo Li,Jianian Hu,Tao Fang,Youlin Zhu,Yi Sun,Xiao Wang,Xuebin Yang,Qiang Shen,Guoqiang Luo
The objective of this study is to modulate the size of intermetallic compounds to increase the strength of Al–Ag composites. In this study, we prepared Al–Ag composites using plasma-activated sintering (PAS). The effect of the applied current on the nucleation barrier of the Al/Ag alloy phase was investigated. The strengthening mechanism of Ag-reinforced Al matrix composites was explored. We found that two alloy phases, Ag 2 Al and Ag 3 Al, were generated in the Al–Ag composites. The alloy phases distributed at the grain boundaries strengthened the Al–Ag composites by enhancing the dislocation density in the matrix and by impeding dislocation motion . The ultimate tensile strength and yield strength of the Al–7Ag composite increased by 60.1% and 166%, respectively, compared with those of pure Al. Moreover, we calculated the contribution of each strengthening mechanism to the overall yield strength. The applied current lowered the nucleation barrier of the alloy phase and facilitated the nucleation process.
研究领域:
材料科学
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金属基复合材料
·
机械工程
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DOI
高影响因子
FULLERENES NANOTUBES AND CARBON NANOSTRUCTURES
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2018
·
IF 1.011
Dong Liu,Yanxiong Liu,Guannan Liu
The influences of carbon nanotubes (CNTs) additions on the flash ignition characteristics of Iron (Fe) and aluminum (Al) nanoparticles (NPs) were presented. CNTs can be used as the additive to these metal nanoparticles for improving the flash ignition and burning processes. Different mass fractions of CNTs additions were considered. The mixture of Al and CNTs could combust in air with obvious giant flame, whereas the mixture of Fe and CNTs combusted under a relative stable condition with slight red light. The temperature distributions were measured using non-contact optical method and showed that Al NPs mixed with CNTs were burning at a higher temperature level than Fe NPs. Although different mass fractions of CNTs cannot significantly change the overall flash ignition phenomenon, CNTs additions influenced the minimum ignition energy (MIE) of mixtures. The appropriate content of CNTs addition can decrease the Fe NPs MIE significantly. However, the Al NPs MIE decreased all along with the increase of CNTs content. The micro- and nano- structures of Fe and Al NPs with CNTs additions before and after ignitions were examined by scanning electron microscope and high-resolution transmission electron microscopy. It was found that the special thermal conductive characteristics of CNTs and the cross-connected features for metal particles with CNTs caused the enhancement of flash ignition.
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DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2024
·
IF 6.2
Peibo Li,Guoqiang Luo,Xiaoshan Zhang,Yi Sun,Qiang Shen
The microstructural design offers an effective strategy for overcoming the strength-ductility trade-off in Al-based composites. In this study, we demonstrate concurrent improvements in strength and ductility of Al-Cu composites by introducing heterogeneous structures, including low-angle grain boundaries (LAGBs), stacking faults (SFs), and nano-CuAl₂. A high density of LAGBs refines Al grains by absorbing dislocation into high-angle grain boundaries (HAGBs) during deformation, which helps to suppress crack propagation under plastic deformation. The absorption of dislocations by LAGBs prevents dislocation pile-up at grain boundaries, thereby reducing stress concentration. The stacking fault network formed at the heterogeneous interface between Al and CuAl₂ effectively reduces the mean free path of dislocation motion, overcoming the Hall-Petch limit in microcrystalline grains. Nano-particles further contribute to Orowan strengthening by hindering dislocation motion. The synergistic effect of these heterogeneous structures successfully evades the strength-ductility trade-off in Al-Cu composites, providing an efficient strategy by multiscale defects to facilitate maintaining plasticity in metal-matrix composites. Employing multiscale defects provides an efficient strategy to maintain plasticity in metal-matrix composites.
研究领域:
材料科学
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金属基复合材料
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材料力学性能
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微观结构设计
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DOI
高影响因子
MOLECULES
·
2026
·Vol. 31
·期 5
·891
·
IF 5.1
He Wang,Zhiyan Zhang,Yingying Xu,Yang Lu,Ying Tian,Guangjie Zhang,Sifan Liu,Shuchen Liu
The separation of xenon (Xe) and krypton (Kr) is very important for industrial applications and environmental protection. However, the lack of permanent dipoles, low polarizabilities arising from their spherical nature, and similar kinetic diameters make their efficient separation by porous adsorbents exceptionally challenging. This study explored the effects of pore geometry and surface polarity of a series of aluminum-based metal–organic frameworks (CAU-10-H, MIL-160, KMF-1, CAU-23) on Xe/Kr separation performance using a heteroatom engineering strategy. These MOFs are composed of AlO 6 clusters and bent dicarboxylic acid linkers, enabling us to systematically investigate the effects of pore size and heteroatom types on Xe/Kr separation performance. Among them, MIL-160 has a polar linker based on furan, showing the best balance performance. At 298 K and 1.0 bar, the uptake of Xe is 4.12 mmol g −1 and the IAST selectivity is 7.63 for a Xe/Kr (20/80) mixture. The practical performance was verified by dynamic breakthrough experiments, which yielded a long Xe breakthrough time of 42.9 min g −1 . Grand Canonical Monte Carlo (GCMC) simulations and first-principles density functional theory (DFT) calculations revealed that the enhanced performance originates from cooperative confinement and polarization effects, with the furanyl oxygen atoms providing optimal Xe-binding sites. This work clarifies the structure–property relationships governing Xe/Kr separation in aluminum-based MOFs (Al-MOFs), highlighting the potential of heteroatom engineering for designing efficient noble gas adsorbents.
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF POWER SOURCES
·
2022
·
IF 9.794
Songmao Zhang,Yichun Wang,Yawen Li,Manhui Wei,Keliang Wang
Primary quasi-solid Al-air batteries with hydrogel have attracted increasing research attention owing to their high energy density , ionic conductivity , good handling and safety. However, a severe corrosion at open-circuit potential destroy the lifespan and performance of discharge. Suppressing the corrosion of Al anode at standby is of great importance. Here, we present a coating hydrophobic membrane on Al surface to restrain open-circuit corrosion, where the hydrophobic property of the protective membrane is analyzed by contact angle test , changing from 22.48 to 149.48°. The results of electrochemical polarization measurement demonstrate that the corrosion inhibition efficiency of the hydrophobic membrane are 81.6%. Also, the discharge performance of assemble quasi solid Al-air batteries are revealed, and compared with pure Al electrode, the lifetime and special capacity of coated Al electrode is enhanced, expressing special capacity of 1126 mA h g −1 at 10 mA cm −2 and a power density of 36.3 mW cm −2 . Meanwhile, the lifespan of coated Al electrode is approximately prolonged by 34% at interval discharge mode . This work demonstrates a hydrophobic membrane on Al-electrode opens up a prospect of a corrosion inhibition for Al-air batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Zhipeng Cheng,Xiaozhong Chu,Wei Zhao,Jingzhou Yin,Benlin Dai,Hui Zhong,Jiming Xu,Yu Jiang
Al powder faces high expectations for its use as fuel due to its high energy density. However, it is covered with a dense Al 2 O 3 layer, which has a high melting point. Thus, the powder has poor heat release and combustion performance. In this work, Cu/Al energetic nanocomposites are fabricated using a simple replacement reaction between Al and CuF 2 solution. CuF 2 ionizes F − to remove the Al 2 O 3 layer on the Al powder surface and ionizes Cu 2+ to provide a Cu source for deposition. The as-obtained Cu/Al nanocomposites have a typical strawberry-like core/shell structure. Cu/Al nanocomposites with different Cu contents can be obtained by simply adjusting the molar ratio of CuF 2 to Al. The design of these Cu/Al nanocomposites can improve the intensity, speed, and completion of the heat release of Al powder. The quantity of Cu strongly influences the heat release magnitude. The maximum heat release of the Cu/Al energetic nanocomposites with 5% Cu content reaches 24.7 kJ g −1 , which is approximately 1.8 times that of raw Al. The heat release mechanism of the proposed Cu/Al nanocomposite is based on the oxidation reaction phenomenon. The as-obtained Cu/Al nanocomposites are expected to have wide application prospects in solid energetic materials.
研究领域:
材料科学
·
能源工程
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DOI
高影响因子
Corrosion Communications
·
2024
·
IF 0
Zhiyuan Feng,Jiao Li,Keqi Huang,Guoqiang Liu,Huanhuan Bai,Xin Huang,Jun Qi,Zhengwei Tang,Penghai Xu,Xiaofei Yang,Zheng Qu,Guozhe Meng
Within the realm of corrosion protection methods for Al alloys, sol-gel technique has garnered increasing attention. However, conventional sol-gel methodologies cannot provide adequate long-lasting corrosion protection to Al alloys when exposed to chloride-rich solutions. This paper introduces an innovative approach to substantially augment the corrosion resistance of aluminum alloys through utilization of polydopamine (PDA)-modified sol-gel films. Effort was made to fabricate a PDA-modified sol-gel coating and a systematic investigation was conducted thereof. Long-term corrosion performance of this coating in 3.5 wt.% NaCl solution was evaluated through electrochemical impedance spectroscopy (EIS). Results show that the low-frequency impedance of the PDA-modified sol-gel coating remains significantly high at 7.9 × 10 5 Ω·cm 2 , even after 36 d of immersion in 3.5 wt.% NaCl medium, indicative of excellent protective properties. It notably surpasses low-frequency impedance of the unmodified coating, which registers at 2.5 × 10 4 Ω·cm 2 . The incorporation of PDA into the sol-gel coating, facilitated by adsorption and diffusion mechanisms, serves to fill micrometer- and nanometer-scale defects of the coating, thereby markedly enhancing their compactness. Furthermore, despite its modest thickness of 9 μm, the PDA-modified coating exhibits enduring corrosion protection capabilities.
研究领域:
材料科学
·
表面工程
·
腐蚀与防护
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纳米材料
·
电化学
✓ 已验证
DOI
Advanced Materials Interfaces
·
2023
·Vol. 10
·期 10
·2201315
·
IF 5.4
Qiangqiang Ma,Chenxu Zhang,Linlin Ren,Xiaoliang Zeng,Jian-Bin Xu,Rong Sun,Yimin Yao
Elastomeric composites are an important class of thermal interface materials as they are shape-adaptive, which can fit uneven interfaces and achieve ideal interfacial heat transfer in electronic cooling. There is often a trade-off between mechanical and thermal performances in highly filled composites. Here, the surface chemistry of Al powders via introducing dodecyltrimethoxysilane (DTS) upon different grafting densities is precisely controlled. The results show that the DTS grafting density of 0.24 molecule nm −2 endows the composites with optimized mechanical properties. The tensile stress, elongation at break, and Young's modulus are enhanced by 180%, 56%, and 94.4% after DTS grafting, respectively. Meanwhile, the composite possesses a high fracture energy of 356.2 J m −2 with an enhanced strain energy density of 37.6 kPa. The DTS grafting on Al also contributes to higher thermal conductivity (4.4 W mK −1 ) and lower contact thermal resistance (0.52 °C cm 2 W −1 ) of the composites and significantly improves the stability of the composites upon high-temperature storage. Guidance is provided here on methods and data references for optimizing the performance of elastomeric composites, which helps to expand their practical application in electronic cooling.
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产品关联
DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2023
·Vol. 106
·期 2
·616-625
·
IF 2.5
Wang Xuan,Qian Junjie,He Chao,Shui Anze,Du Bin
Al-doped-SiOC ceramics were fabricated via condensation polymerization and then pyrolysis of preceramic precursor in this study. The Al cation induced the formation of mullite, SiO 2 and graphitic carbon. Results showed that the incorporation of Al element enhanced the thermal stability of SiOC ceramics under Ar atmosphere via suppressing carbothermal reduction. This was consistent with the observation from Raman spectra by curve-fitting according to the D-to-G peak intensity ratio. In addition, the thermal stability of the SiAlOC ceramics under air atmosphere was also investigated. The formation of the mullite phase under the air atmosphere indicated that the SiAlOC ceramics possessed better oxidation resistance properties than the pure SiOC ceramics. This work provides a new guide to fabricating metal-modified SiOC ceramics with desired structures. Graphical Abstract
The introducing Al element greatly enhanced the thermal stability of SiOC ceramics via restraining in-situ formation of SiC. The structural evolutions of Al cation-modified-SiOC ceramics both in argon and air atmospheres were investigated systematically.
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产品关联
DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2023
·
IF 6.4
Yang Wang,Qiang Liu,Biao Zhang,Hongxu Wang,Paul J. Hazell,Zhuoqun Han,Jian Li,Bo Li,Ling Li,Futian Liu,Feng Ye
Functionally graded materials (FGMs) are promising protective structures for lightweight armor plates because of their features and designability. However, traditional discretely layered FGMs with macroscopic interfaces can generate unfavorable interlaminar stresses under ballistic attacks, eventually leading to delamination or interlayer tearing. Herein, we constructed new B 4 C/2024Al FGMs without sharp interfaces between layers. The FGM armor systems with varying through-the-thickness distributions were tested against 7.62 mm armor-piercing incendiary projectiles. The effects of compositional gradient exponent on the damage characteristics, stress distribution and energy evolution were numerically and experimentally investigated. The results indicated that the smooth transition within through-the-thickness microstructures effectively avoided the occurrence of interlayer delamination or tearing. The compositional gradient exponent played an essential role in the impact response of the FGM targets. The FGM having a linear composition gradient outperformed other nonlinear types with respect to energy absorption and ballistic properties due to the reduced tensile wave strength and prolonged projectile-target interaction time. Furthermore, the structural optimization problem with the objective of maximizing ballistic efficiency was solved using the conjugate gradient method, and the optimal design of the FGM targets was achieved. The current research provides a promising design guideline for developing and optimizing new advanced lightweight composite armor.
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DOI
高影响因子
Molecular Catalysis
·
2022
·
IF 5.089
Rongzhao Li,Chengtao Zhang,Shuo Li,Yupeng Du
Propane dehydrogenation is commonly operated at temperatures exceeding 600 °C due to thermodynamic requirements. However, high temperature accelerates the deactivation of catalysts because of the coke deposition. Therefore, it is quite necessary to develop catalysts with high catalytic activity and improved anti-coking ability. To this end, an Al-doped Cr 2 O 3 catalyst derived from MIL-101(Cr/Al) is prepared in this work. The preparation conditions, including the carbonization temperature of MIL-101 and the proportion of Cr/Al, are optimized via experimental studies. Meanwhile, the adsorption and dehydrogenation behaviors of propane on the catalyst are investigated using Density Functional Theory (DFT) methods. Findings indicate that the optimum carbonization temperature and Cr/Al proportion are 900 °C and 6:4, respectively. Under the reaction condition of P = 0.1 MPa, T = 580 °C and GHSV = 800 h −1 , the propane conversion and propylene selectivity on the Cr 6 /Al 4 catalyst are 19.5% and 92.0%, respectively. The activity stability of the Al-doped Cr 2 O 3 is elongated significantly due to the lower desorption energy of propene and higher energy barrier for the coke formation on the catalyst. In sum, the present work completed via experiments and DFT calculations will lead to a better understanding of the Al-doped Cr 2 O 3 catalyst and guide the rational design of anti-coking catalysts for propane dehydrogenation.
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Jiayi Wang,Chunhao Wan,Qi Tang,Jian Xu,Nianxi Xu,Shansheng Yu,Xiaoyi Wang,Hongwei Tian
Due to the harmful influence of electromagnetic waves, electromagnetic absorption materials are being actively pursued. Herein, a one-step hydrothermal method is used to synthesize rGO/Al/CoFe 2 O 4 composites with different amounts of CoFe 2 O 4 , and their electromagnetic properties and infrared emissivity are studied in detail. The results reveal that the rGO/Al/CoFe 2 O 4 composite with a CoFe 2 O 4 content of 0.06 g possesses a minimum reflection loss (RL min ) of −68.03 dB at 15.5 GHz at a thickness of 1.38 mm, while the effective absorption broadband (EAB) and infrared emissivity are found to be 3.3 GHz and 0.63, respectively. Hence, the as-designed rGO/Al/CoFe 2 O 4 composites can be used for both wave absorption and low-infrared emissivity fields, and the proposed strategy is an effective solution for designing bifunctional wave absorption materials.
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产品关联
DOI
高影响因子
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