JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 24
·11013-11025
·
IF 4.682
Luo Guoqiang,Li Peibo,Hu Jianian,Guo Jingwei,Sun Yi,Shen Qiang
The purpose of this paper was to design an Al–Cu–Ag–C material system to address the deterioration of mechanical properties caused by intermetallic compounds generated during Al–Cu sintering. The in situ pyrolytic C layer was encapsulated on the surface of the raw material particles, which prevented Al–Cu diffusion and reduced the generation of intermetallic compounds. The microstructure of the Al–Cu–Ag–C composites illustrates that several alloy phases of Al 2 Cu, Al 4 Cu 9 , and Ag 2 Al are formed. The addition of Ag significantly improved the mechanical properties of the composite due to the formation of the Ag 2 Al phase and Cu–Ag solution. The tensile strength and compressive strength of Al–52Cu–3Ag–C are increased by 123.9% and 64.9% over Al–52Cu–C, and the strain is also considerably improved. The strength enhancement derived from the Orowan strengthening contributed by Ag 2 Al, and the solid solution strengthening contributed by Ag–Cu solid solution, respectively. The presence of Ag 2 Al also enhances the hardness of the composite.
研究领域:
材料科学
·
力学
✓ 已验证
DOI
高影响因子
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
·
2021
·
IF 5.234
Kun Xie,Guopeng Zhang,Hai Huang,Jianjian Zhang,Zhongxia Liu,Bin Cai
The effects of carbon nanotube aspect ratio ( R ) on mechanical properties of CNT/Al composites containing 0–2.0 wt% CNTs are studied. The optimum carbon nanotube (CNT) reinforced aluminum (Al) composites are fabricated at 580 °C for 1 h under 60 MPa, and subsequently hot extruded at 480 °C. CNT addition within 0.5 wt% can increase the strength significantly without plasticity loss, which overcomes the dilemma of strength and toughness. Strength and hardness increase significantly due to the uniformly distributed CNTs in Al matrix within a content of 1.0 wt%. Quantitatively fitting results also show that the main strengthening mechanism of CNT/Al composites should be dispersion strengthening rather than load transfer. The R , which is very crucial for load transfer theory, has only small effects on the mechanical properties of CNT/Al composites. The calculated CNTs diameters are close to the experimental used ones.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
·
2022
·
IF 6.044
Dezhi Wang,Dongyang He,Kai Li,Zhuangzhi Wu
The strength enhancement is critical for the application exploration of Mo-based materials. In this work, a secondary phase of WC is introduced into the Mo matrix, and the corresponding phase, microstructure and mechanical properties have been studied. It is found that the addition of WC particles can significantly improve the mechanical properties, leading to a high ultimate tensile strength (UTS) of 591.5 MPa and a hardness of 242.7 HV over the sintered Mo–12%WC composite, which are about 21.2% and 49.5% higher than those of pure Mo, respectively. During the sintering, the additive WC particles react with the Mo matrix to in-situ generate W and Mo 2 C, and the former is dissolved into the Mo matrix to exhibit solid solution strengthening. Besides, the latter hinders the migration of grain boundaries (GBs) to limit the grain growth of Mo, resulting in smaller grain size. More importantly, the Mo 2 C ( 1 ‾ 2 ‾ 1 ) can gain coherent interfaces with Mo ( 1 1 ‾ 0) to intensify the phase boundary. This work paves a way for the design of high-performance composites through the in-situ reinforcement of decomposable additives.
研究领域:
材料科学
·
力学
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
·
2022
·
IF 11.322
Kan Liu,Yishi Su,Xiaozhen Wang,Yunpeng Cai,He Cao,Qiubao Ouyang,Di Zhang
The incorporation of micro- and nano-sized SiC particles (micro- & nano-SiCps) into Al matrix constituted the micro- & nano-SiCp/Al composites through powder metallurgy . A unique ultrafine-grained (UFG) microstructure with micro-SiCps distributed among Al grains and most of nano-SiCps dispersed in grain interiors is characterized. Based on this, the synergetic constraint of dual-scale reinforcements on deformation of Al matrix is employed to enhance dislocation accumulation through increased SiCp/Al interface area and Orowan pinning effect, resulting in an improved strain hardening capacity. Compared with 10 vol% micro-SiCp/Al composites, the composites with 1 vol% nano-SiCps and 9 vol% micro-SiCps exhibit notable tensile properties of 285 MPa in yield strength , 374.7 MPa in ultimate strength and 11.3% in total elongation, increased by 32.6%, 28.7% and 37.8%, respectively, while remain a comparable Young's modulus of 94.6 GPa. Theoretical analysis proves that the dominant strengthening mechanism in micro- & nano-SiCp/Al composites is dislocation strengthening, different from the load transfer in individual micro-SiCp/Al composites. Our work provides inspirations for fabricating high-modulus Al matrix composites with simultaneously enhanced strength and ductility.
研究领域:
材料科学
·
力学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
·
2022
·
IF 6.162
Lu Han,Jing Wang,Yuanyuan Chen,Zhang Liu,Yuan Huang,Dongguang Liu,Laima Luo,Chenxi Liu,Yongchang Liu,Zumin Wang
Metallurgical bonding was achieved between carbide-dispersion-strengthened Cu (CDS-Cu) and oxide-dispersion-strengthened W (ODS-W) after diffusion bonding via an interface tailoring method of anodization and deoxidation of ODS-W combined with the introduction of Cu wetting layer. The shear strength of the CDS-Cu/ODS-W joints fabricated by the interface-tailoring bonding is 124 MPa, which is higher than that of 99 MPa of the joint prepared by direct bonding. The increase in strength is due to the achievement of the metallurgical bonding between CDS-Cu/ODS-W, the increase of the debonding energy and the increase of propagation distance of the cracks. After metallurgical bonding, the second phase particles of WC in CDS-Cu and Y 2 O 3 in ODS-W were dispersed at the phase boundary to reduce the lattice strain energy. This work paves the way for the preparation of advanced plasma-facing components comprised of high-performance CDS-Cu and ODS-W for China Fusion Engineering Test Reactor (CFETR).
研究领域:
材料科学
·
核能工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Peibo Li,Guoqiang Luo,Guinan Zhao,Huawu Liu,Yi Sun,Qiang Shen
Al powder is prone to oxidation, which can introduce impurities in powder metallurgy. In this study, Al 2 O 3 nanonetworks were obtained by destroying the oxide layer through Paulse Activated Sintering (PAS). The network and the nano-precipitation enhance the mechanical properties of Al-Cu-O composites. TEM analysis revealed the formation of CuAl 2 and an Al 2 O 3 network at the grain boundaries. The current facilitated the modulation of the intermetallic compound size and the fragmentation of the oxide layer. The current-induced discharge at the particle interfaces generated localized heating. Higher temperature effectively disrupts the oxide layer. The Al 2 O 3 network improved the fracture toughness of the Al-Cu-O composites by passivating crack propagation. Simultaneously, the current reduced the nucleation barrier for precipitation by promoting directional atomic migration. Uniformly dispersed nano-precipitates are conducive to the improvement of strength. This study provides new insights into oxidation-related challenges in Al powder.
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
·
2022
·
IF 6.044
Zeyun Cai,Tao Xiang,Weizong Bao,Jiayin Chen,Tian Gao,Guoqiang Xie
Pure titanium is an ideal material for tissue replacements and implant materials for its superior biocompatibility and corrosion resistance , but its limited strength remains a major obstacle to its wide applications. A promising strategy for enhancing the strength is to alloy the pure titanium with oxygen. Herein, we reported an oxygen solid solution strengthening for pure titanium by achieving a titanium-oxygen (Ti–O) alloy using ball milling (BM) and spark plasma sintering (SPS). The effect of oxygen contents, ranging from 0.33 to 2.08 wt%, on the mechanical properties of pure titanium was systematically investigated. Experimental results indicate that the Ti–O alloy with the oxygen content of 1.95 wt% reached an ultrahigh yield strength of 2026 MPa and showed a large ductility of 11.2% in compression. According to the quantified analysis of strengthening mechanisms, solid solute oxygen atoms are responsible for the balance of superior yield strength and ductility of the Ti–O alloys.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Kaili Gong,Lian Yin,Congling Shi,Xiaodong Qian,Keqing Zhou
It is challenging that the functionalized MXene-based nanofillers are designed to modify the inherent flammability and poor toughness of epoxy polymeric materials and further to facilitate the application of EP composites. Herein, silicon-reinforced Ti 3 C 2 T x MXene-based nanoarchitectures (MXene@SiO 2 ) are synthesized by simple self-growth method, and its enhancement effects on epoxy resin (EP) are investigated. The as-prepared nanoarchitectures realize homogeneous dispersion in EP matrix, indicating well performance-enhancing potential. The incorporation of MXene@SiO 2 achieves improved thermal stability for EP composites with higher T -5% and lower R max values. Moreover, EP/2 wt% MXene@SiO 2 composites obtain a 30.2% and 34.0% reduction in peak heat release rate (PHRR) and peak smoke production rate (PSPR) compared to those of pure EP, respectively, also achieving a 52.5% fall in smoke factor (SF) values and increased yield and stability of chars. The dual char-forming effects of MXene@SiO 2 nanoarchitectures, including the catalytic charring of MXene and the migration of SiO 2 to induce charring, are accounted for the results, as well as lamellar barrier effects. Additionally, EP/MXene@SiO 2 composites achieve an enhanced storage modulus of 51.5%, along with improved tensile strength and elongation at break, compared to those of pure EP.
研究领域:
材料科学
·
复合材料工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Minerals
·
2019
·Vol. 9
·期 8
·463
·
IF 2.25
Yuqing Huang,Wanzhong Yin,Rongdong Deng,Dingquan Xing,Feng Rao
The conventional sulfidation-xanthate flotation process that consists of sulfidization with sodium sulfide, activation by heavy-metal ions, and collection with xanthate is not sufficiently efficient for treating hemimorphite, and the dosages of the sulfurizing reagent and metal ions are large. In this study, the sulfidation flotation (Pb2++ Na2S + Pb2++ xanthate) of hemimorphite was strengthened by pretreating with Pb2+before sulfidation. Microflotation test results indicated that the recovery of hemimorphite increased by 5–10% after pretreatment with Pb2+. The comprehensive results of adsorption experiments, scanning electron microscopy–energy-dispersive X-ray spectroscopy, atomic force microscopy, and X-ray photoelectron spectroscopy indicated that a large amount of Pb2+was adsorbed on the hemimorphite surface and entered the lattice, forming Zn(4−x)PbxSi2O7(OH)2·H2O. The newly formed component had an increased amount of surface sulfidation active sites and had the effect of induced crystallization, making the surface more effective for sulfidation. After the Pb2+was added to the pulp, a large number of uniform and dense PbS species were formed on the hemimorphite surface, increasing the number of adsorption sites for xanthate and reducing the competitive adsorption of residual S2−on the xanthate.Keywords:hemimorphite;flotation;strengthening sulfidation;pretreatment;lead ion
研究领域:
矿物加工工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Micromachines
·
2021
·Vol. 12
·期 10
·1222
·
IF 2.891
Yin Tang,Yongjie Zheng,Jingzhi Tian,Jing Sun
A micro-channel distillation device was used for the process intensification method to separate boron isotopes,10B and11B. Three-dimensional (3D) printing technology was introduced to manufacture the micro-channel device, which used the chemical exchange method with anisole as the donor to separate the boron isotopes. This device was tested in total reflux mode, and the height of an equivalent theoretical plate of the micro-channel distillation equipment was reduced to 1.56 cm. The accurate control of pressure and temperature, as well as the flow rate of the complex, were factors that affected separation ability. Thus, for process intensification, this micro-channel distillation device can be operated horizontally and connected in series into similar modules to effectively improve separation efficiency and reduce the size of the equipment.Keywords:process intensification;boron isotope;micro-channel;distillation;3D printing
研究领域:
化学工程
·
材料科学
·
分离技术
✓ 已验证
DOI
PubMed
高影响因子
BIORESOURCE TECHNOLOGY
·
2023
·
IF 11.4
Jiaxin Wang,Chiqian Zhang,Ping Li,Hui Xu,Weiwu Wang,Weizhao Yin,Jinhua Wu,Zhiqiang Hu
Tetrasphaera -enhanced biological phosphorus removal ( T -EBPR) was developed by augmenting conventional EBPR (C-EBPR) with Tetrasphaera to improve phosphorus removal from anaerobic digestate of swine wastewater. At influent total phosphorus (TP) concentrations of 45–55 mg/L, T -EBPR achieved effluent TP concentration of 4.17 ± 1.02 mg/L, 54 % lower than that in C-EBPR (8.98 ± 0.76 mg/L). The enhanced phosphorous removal was presumably due to the synergistic effect of Candidatus Accumulibacter and Tetrasphaera occupying different ecological niches. Bioaugmentation with Tetrasphaera promoted the polyphosphate accumulation metabolism depending more on the glycolysis pathway, as evidenced by an increase in intracellular storage compounds of glycogen and polyhydroxyalkanoates by 0.87 and 0.34 mmol C/L, respectively. The enhanced intracellular storage capacity was coincidentally linked to the increase in phosphorus release and uptake rates by 1.23 and 1.01 times, respectively. These results suggest bioaugmentation with Tetrasphaera could be an efficient way for improved phosphorus removal from high-strength wastewater.
研究领域:
环境工程
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 22
·9382-9393
·
IF 4.5
Wang Bingying,Zhang Keke,Gao Yijie,Liu Peng,Liu Bo,Zhang Zhansheng
The trend toward miniaturized and highly integrated chip packaging has created a pressing need for lead-free solders with high strength, toughness, and conductivity. In this paper, we designed a scheme of Al 2 O 3 -modified nanomaterial-reinforced low silver Sn1.0Ag0.5Cu (SAC105) solder matrix. To begin with, a novel amorphous carbon and nickel core–shell structure plating modified on Al 2 O 3 (C/Ni/Al 2 O 3 ) were prepared by the electroless plating method. Then, the nano-C/Ni/Al 2 O 3 particle as reinforcement phase was mixed into the matrix solder alloy by ultrasonic vibration stirring. Finally, the morphology and relationship between coated carbon, deposited nickel and original solder interface were analyzed. The microstructure and main properties of the modified solders were also investigated. The experimental results suggested that amorphous carbon and nickel film were prepared on the surface of Al 2 O 3 by electroless plating method. The outer layer of nano-Al 2 O 3 was coated with non-uniform thickness of nickel and carbon coatings. The mass percentage of amorphous carbon was about 3.50%. Adding C/Ni/Al 2 O 3 (0–0.5%) into the SAC105 solder matrix resulted in a gradual increase in conductivity and wettability. The strength and toughness of the modified solder alloy improved as well with the adjunction of reinforced phase. The tensile fracture surface exhibited from a mixture of ductile and brittle, characterized by dimples and cleavage surface, to a purely ductile mode consisting mainly of dimples.
研究领域:
材料科学
·
电子工程
✓ 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）