MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
·
2020
·
IF 4.652
Dezhi Wang,Yao Lu,Xinli Liu,Bohua Duan,Zhuangzhi Wu
The secondary phase particles of La 2 O 3 play a crucial role in the determination of the yield strength over MoLa alloys, but few work focuses on their intrinsic modulation of shape and size. Herein, a nanostructuring strategy of the secondary phase particles is proposed to enhance the mechanical performances of MoLa alloys, in which the shape and size effects of secondary phase particles have been discussed. Moreover, the strengthening mechanism is also analyzed. It is found that the La 2 O 3 nanospheres with a small size of 84 nm exhibit the best strengthening ability, leading to a high yield strength of 765 MPa in the sintered state. Smaller particles are easily involved into the Mo matrix interior to be intragranular, which are beneficial for the further strengthening. The strengthening contributions are quantitatively calculated, providing a predicted yield strength value, which is in good agreement with the measured one.
研究领域:
材料科学
·
力学
✓ 已验证
DOI
高影响因子
POWDER METALLURGY AND METAL CERAMICS
·
2019
·Vol. 58
·期 5
·278-284
·
IF 0.381
Su Mingzhou,Wang Huimeng,Zhou Qiaoling,Chen Chang
The space holder technique was widely used in manufacturing high melting-point porous metals. Corn powders with a smaller size (11.4 μm on average) than that of iron powders (25.5 μm on average) were used as a space holder. Porous irons having microporosities between 37.9% and 48.9% were produced after sintering at 1100–1250°C for 2 h. The amount of increase in microporosity was much less than the corn volume fraction because some corn powders scattered in micropores already formed between the iron powders. The volumetric shrinkage increased with the corn addition and/or the sintering temperature. In addition, the compressive yield stress was 108 ± ± 8 MPa, 77 ± 26 MPa, and 61 ± 31 MPa for corn additions of 0, 20, and 40 vol.%, respectively. The high sintering temperature could reduce the negative effect of corn addition on the yield stress. Perfect contacts between iron powders were observed at 1250°C, indicating that a high temperature was necessary to obtain excellent mechanical properties for this kind of porous irons.
研究领域:
材料科学
·
机械工程
✓ 已验证
DOI
高影响因子
Advanced Science
·
2024
·Vol. 11
·期 44
·2407765
·
IF 14.3
Tianxiang Du,Ning Ma,Zenghui Zhao,Yitong Liu,Xufeng Dong,Hao Huang
The shear yield strength, sedimentation stability and zero-field viscosity of magnetorheological fluids (MRFs) are crucial for practical vibration damping applications, yet achieving a balanced combination of these performances remains challenging. Developing MRFs with excellent comprehensive performance is key to advancing smart vibration damping technologies further. Theoretically, incorporating a multiscale particle system and leveraging synergistic effects between their can somewhat enhance MRFs’ performance. However, this approach often faces issues such as insignificant increases in shear yield strength and excessive rise in zero-field viscosity. In response, this study employs a DC arc plasma method to synthesize a high magnetic permeability, low coercivity submicron FeNi particles, and further develops a novel CIPs-FeNi bidisperse MRFs. The introduction of submicron FeNi particles not only significantly enhances the shear2019 yield strength of MRFs under low magnetic fields but also promotes improvements in sedimentation stability and redispersibility without excessively increasing viscosity. Comprehensive performance analysis is conducted to explore the optimal content ratio, and detailed mechanisms for the enhancement of performance are elucidated through analysis of parameters such as chain-like structure, magnetic flux density and friction coefficient. Most importantly, the superior comprehensive performance combined with straightforward fabrication methods significantly enhances the engineering applicability of the CIPs-FeNi bidisperse MRFs.
研究领域:
材料科学
·
智能材料
·
振动控制工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2024
·
IF 5.3
Yitong Liu,Tianxiang Du,Zexian Zhang,Ning Ma,Xufeng Dong
Magnetorheological (MR) fluids can rapidly shift between solid and liquid phases in response to changes in an applied magnetic field, which can be precisely controlled by the external environment. This capability underscores the significant potential of MR fluids in damper applications. However, the main challenge is the difficulty in simultaneously enhancing their key properties, which constrains their development potential. In this study, we propose using a novel phenylmethyl siloxane (PSO) with high steric hindrance as the carrier fluid to enhance the overall performance of MR fluids. Compared with conventional dimethyl siloxane (SO) carrier liquid, the PSO carrier fluid, despite its lower viscosity, demonstrated a 17 % enhancement in shear yield strength at the magnetic field of 280 kA/m and a 5 % improvement in sedimentation stability. The Molecular dynamics simulations further confirmed that the presence of benzene side groups, compared to methyl groups, confers superior resistance to deformation and steric hindrance. Consequently, this enhances the shear stress and sedimentation stability of MR fluids during shear deformation. By conducting the comprehensive analysis of experimental results and numerical simulations, this study has deepened our understanding of the intricate relationship between the characteristics of carrier liquid and MR fluids.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
RARE METALS
·
2024
·
IF 9.6
Zhang Xue-Hui,Yuan Hai-Xiang,Huang Fei,Wang Hang,Yang Bin,Zeng Long-Fei,Li Xin-Hao,Huang Ya-Jian,Ahmad Tahir
Designing heterogeneous grain structure (HGS) has been proven to be an effective strategy for overcoming the strength-plasticity dilemma in copper and copper alloys. However, the construction of HGS in dispersion-strengthened copper (DSC) for enhancing strength-plasticity synergy remains challenging. Here, we proposed a novel method, multistep ball milling and reduction process followed by spark plasma sintering, to prepare DSC with an HGS to ameliorate the strength-plasticity dilemma in DSC. Micron- and nano-CuO and nano-Y 2 O 3 powders were chosen as raw materials in this new method. The Cu-7 vol% Y 2 O 3 composite, exhibiting a compressive yield strength of 438 MPa and a failure strain of 46.3%, exhibits a superior strength-plasticity tradeoff in comparison with other DSC materials. Systematic experiments indicate that the back-stress at the heterointerfaces between coarse grains and fine grains maybe not only raise the yield strength of Cu-Y 2 O 3 composite, but also significantly enhance the strain hardening to increase the plasticity of the material. The new HGS designing route in this study offers a feasible pathway to develop DSC with a remarkable enhancement in strength and plasticity. Graphical abstract
研究领域:
材料科学
·
冶金学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2022
·
IF 8.025
Yajun Ren,Xiaohong Hu,Youhua Chen,Lei Liu,Rui Qu,Huidi Xu,Xiaofeng Song
Biodegradable shape-memory polymers (SMPs) which are functional materials with applicability for medicine devices are designed to acquire their therapeutically relevant shape and drug release after implantation. In the work, an amphiphilic polymer (PVAD) is synthesized by using polytetrahydrofuran (PTMG), vinyl acetate (VAc), acrylic acid (AA), tetramethyltetravinylcyclotetrasiloxane (D 4 vi ) as raw materials. PVAD encapsulating hydrophilic drug as switching phase and poly( l -lactide) (PLLA) as fixing matrix construct an SM system with the characteristic of “reservoir-matrix” drug release. The shape recovery ratio ( R r ) of medicated PVAD/PLLA reaches 99 % by heat-water stimulation. The effects of release temperature and SM on drug release are investigated. With the release temperature increasing, the medicated PVAD/PLLA accelerates drug release and shows burst release initially, while the drug release for the medicated PLLA changes slightly. The drug release rate goes up after 3 rounds of SM. The mechanism of SM system controlling drug release is put forward based on structural changes. The yield strength and elongation at break of medicated PVAD/PLLA are 29.8 MPa and 44.6 %, respectively. It opens up new perspectives for drug carrier matrices in Pharmaceutical Sciences.
研究领域:
药学
·
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CELLULOSE
·
2023
·
IF 5.7
Yang Junjie,Wang Siyong,Yao Jintong,Jiang Zhen,Fang Mingjian,Yu Tao,Wei Kang
This study focuses on investigating a novel category of paper actuators, aiming to attain a favorable equilibrium between substantial electrically actuated force and extended service lifetime ( T s ) for the soft electric-responsive artificial muscle. Consequently, the present research has developed an Electro-responsive Biomass Paper Actuator (ERBPA) utilizing calcium alginate hydrogel, employing absolute ethanol (CH 3 CH 2 OH) as the slow-release agent, through a straightforward and viable preparation procedure. Moreover, a comprehensive investigation was carried out on the electro-mechano-chemical behaviors and strengthening mechanism of the ERBPA with varying volume fractions of CH 3 CH 2 OH, under the electrical actuation of 4 V DC voltage. The experimental findings revealed a gradual decrease in the density of electrically actuated force, elastic modulus, and yield strength with the increasing volume fraction of CH 3 CH 2 OH. Specifically, at a volume fraction of 30%, these properties reached their respective minimum values of approximately 15.152 mN/g, 6.5 MPa, and 0.0999 MPa. In contrast to the internal resistance ( R g ) of the ERBPA, the specific capacitance ( C p ) and the T s exhibited an initial improvement followed by a reduction, while the rise time ( T r ) demonstrated a positive correlation with the volume fraction of CH 3 CH 2 OH but a negative correlation with the reaction velocity ( V f ). Specifically, at a volume fraction of 25%, C p , T s and T r reached their maximum values of 96.2 mF/g, 1287 s, and 170 s, respectively, whereas R g and V f attained their minimum values of 2.39 Ω and 0.044 mN/g·s, respectively. The slow-release effect of CH 3 CH 2 OH inherently contributed to the protection of certain free Ca 2+ ions, thereby causing a gradual and consistent coordination process with sodium alginate molecules. This, in turn, greatly enhanced the internal structure of ERBPA, resulting in exceptional T s stability and operational performance.
研究领域:
材料科学
·
电化学
·
机械工程
·
生物技术
✓ 已验证
产品关联
DOI
高影响因子
Advanced Healthcare Materials
·
2024
·
IF 10
Xian Tong,Yilong Dong,Runqi Zhou,Xinkun Shen,Yuncang Li,Yue Jiang,Huiyuan Wang,Jinguo Wang,Jixing Lin,Cuie Wen
Magnesium (Mg) alloys are widely used in bone fixation and bone repair as biodegradable bone-implant materials. However, their clinical application is limited due to their fast corrosion rate and poor mechanical stability. Here, the development of Mg–2Zn–0.5Ca–0.5Sr (MZCS) and Mg–2Zn–0.5Ca–0.5Zr (MZCZ) alloys with improved mechanical properties, corrosion resistance, cytocompatibility, osteogenesis performance, and antibacterial capability is reported. The hot-extruded (HE) MZCZ sample exhibits the highest ultimate tensile strength of 255.8 ± 2.4 MPa and the highest yield strength of 208.4 ± 2.8 MPa and an elongation of 15.7 ± 0.5%. The HE MZCS sample shows the highest corrosion resistance, with the lowest corrosion current density of 0.2 ± 0.1 µA cm −2 and the lowest corrosion rate of 4 ± 2 µm per year obtained from electrochemical testing, and a degradation rate of 368 µm per year and hydrogen evolution rate of 0.83 ± 0.03 mL cm −2 per day obtained from immersion testing. The MZCZ sample shows the highest cell viability in relation to MC3T3-E1 cells among all alloy extracts, indicating good cytocompatibility except at 25% concentration. Furthermore, the MZCZ alloy shows good antibacterial capability against Staphylococcus aureus .
研究领域:
材料科学
·
生物材料
·
生物医学工程
·
腐蚀科学
·
细胞生物学
·
微生物学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）