Journal of Magnesium and Alloys
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2021
·
IF 10.088
Baojing Feng,Guonan Liu,Peixu Yang,Sensen Huang,Dongqing Qi,Peng Chen,Chengduo Wang,Jiang Du,Shaojun Zhang,Jinhui Liu
Effect of the second phase in the micro-galvanic corrosion of a commercial Mg alloy containing rare earth elements, cast WE43 alloy, was investigated in 0.6 M NaCl solution and 0.6 M Na 2 SO 4 solution by scanning electron microscopy (SEM) observations, scanning Kelvin probe force microscopy (SKPFM) analysis, hydrogen evolution, weight loss measurement, and electrochemical techniques. It is confirmed that the second phase of cast WE43 alloy is more active than Mg matrix and exhibits an anodic role in the micro-galvanic corrosion with α-Mg matrix as cathode and dissolves preferentially in Na 2 SO 4 solution, in contrast to the situation in NaCl solution. The corrosion rate of cast WE43 alloy in Na 2 SO 4 solution is much higher than that in NaCl solution, which is different from the conventional wisdom and could be attributed to the different role of the second phase in the micro-galvanic corrosion in two solutions.
研究领域:
材料科学
·
腐蚀科学
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产品关联
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Huanghua Zhang,Yuming Zhao,Jinhui Liu,Jilei Xu,Dong Guo,Chenxu Li,Xianghong Zhou,Peixu Yang,Shaojun Zhang
The corrosion behavior of Mg-7Nd and Mg-10Y binary alloys were investigated through scanning electron microscope observation, hydrogen evolution, weight loss experiment and electrochemical test. It was found that the corrosion rates of two alloys are mainly influenced by the micro-galvanic corrosion between the second phase and α-Mg matrix, and the second phases (Mg 12 Nd and Mg 24 Y 5 ) have a higher activity than α-Mg matrix and act as an anode to corrode preferentially during the micro-galvanic corrosion process. Mg-7Nd alloy has a faster corrosion rate than Mg-10Y alloy due to the fact that it contains more second phase and the second phase containing Nd elements is more reactive. The different distribution of rare earth elements in the alloy can lead to different corrosion morphology.
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2022
·Vol. 12
·期 45
·29338-29345
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IF 4.036
Jun Chen,Xianfeng Yang,Chunyan Jiang,Yunfeng Wang,Lei Zhou,Mingmei Wu
Concentration quenching, which generally originates from serious energy migrations among the uniformly distributed luminescent centers in the host matrix, is a key factor to influence the luminescence properties of materials. Different from previous reports, we demonstrate a novel fluorescence-quenching mechanism attributable to the second-phase Eu2W2O9 in non-equivalent substituted SrWO4:xEu3+ phosphors. The crystal structure, elemental distribution, and luminescence properties of the as-prepared SrWO4:xEu3+ phosphors are systematically investigated. A second-phase Eu2W2O9 is confirmed when the Eu3+-doping concentration exceeds 20%, which produces the new structure defects and energy-transfer paths, resulting in fluorescence quenching in this material. This finding gives a new perspective to analyze the concentration-quenching mechanism of the non-equivalent substituted phosphors and can help in the design of new, efficient luminescence materials. In addition, the as-prepared SrWO4:xEu3+ phosphors exhibit a strong intrinsic excitation in the range of 355–425 nm, which is accompanied by the Commission Internationale de I'Eclairage (CIE) coordinates at (0.653, 0.347) and stable color purity of up to 94.52%. A packaged white light-emitting diode with CIE chromaticity coordinates of (0.398, 0.335), correlated color temperature of 3132 K, and color rendering index of 84.3 is fabricated by SrWO4:20%Eu3+ phosphors with blue BAM:Eu2+ and green YAGB:Tb3+ phosphors in a near-ultraviolet chip.
研究领域:
材料科学
·
光学
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产品关联
DOI
PubMed
高影响因子
International Journal of Minerals Metallurgy and Materials
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2022
·Vol. 29
·期 11
·2012-2019
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IF 3.85
Hu Weiqiang,Gong Fengming,Liu Shaocun,Tan Jing,Chen Songhua,Wang Hui,Ma Zongqing
The oxide dispersion strengthened Mo alloys (ODS-Mo) prepared by traditional ball milling and subsequent sintering technique generally possess comparatively coarse Mo grains and large oxide particles at Mo grain boundaries (GBs), which obviously suppress the corresponding strengthening effect of oxide addition. In this work, the Y 2 O 3 and TiC particles were simultaneously doped into Mo alloys using ball-milling and subsequent low temperature sintering. Accompanied by TiC addition, the Mo−Y 2 O 3 grains are sharply refined from 3.12 to 1.36 µm. In particular, Y 2 O 3 and TiC can form smaller Y−Ti−O−C quaternary phase particles (∼230 nm) at Mo GBs compared to single Y 2 O 3 particles (∼120 nm), so as to these new formed Y−Ti−O−C particles can more effectively pin and hinder GBs movement. In addition to Y−Ti−O−C particles at GBs, Y 2 O 3 , TiO x , and TiC x nanoparticles (<100 nm) also exist within Mo grains, which is significantly different from traditional ODS-Mo. The appearance of TiO x phase indicates that some active Ti within TiC can adsorb oxygen impurities of Mo matrix to form a new strengthening phase, thus strengthening and purifying Mo matrix. Furthermore, the pure Mo, Mo−Y 2 O 3 , and Mo−Y 2 O 3 −TiC alloys have similar relative densities (97.4%–98.0%). More importantly, the Mo−Y 2 O 3 −TiC alloys exhibit higher hardness (HV 0.2 (425 ± 25)) compared to Mo−Y 2 O 3 alloys (HV 0.2 (370 ± 25)). This work could provide a relevant strategy for the preparation of ultrafine Mo alloys by facile ball-milling.
研究领域:
材料科学
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金属合金制备
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微观结构调控
✓ 已验证
DOI
高影响因子
ACTA MATERIALIA
·
2021
·
IF 8.203
Jie Chen,Qiang Sun,Deyu Bao,Bang-Zhou Tian,Zegao Wang,Jun Tang,Dali Zhou,Lei Yang,Zhi-Gang Chen
Thermoelectric materials strengthened by defect engineering can also suffer from the compromise of plasticity, and in turn results in negative effect on the processability, reliability and durability of thermoelectric devices. Here, we introduce nano-twinned CuAgSe secondary phase to achieve simultaneously increased compressive strength and plasticity of the β-Ag 2 Se pellets without obviously sacrificing the thermoelectric performance, as evidenced by our thermoelectric measurements. Our pellet shows a maximum compressive strength of 96 MPa, which is ∼104% higher than that of pristine Ag 2 Se, ascribed to the impeded crack propagation by the CuAgSe secondary phase. An extraordinary deformation value of ∼19% is observed at the maximum compressive strength, which is attributed to the intrinsically large plastic deformation of the Ag 2 Se matrix, the deformable nano-twinned CuAgSe secondary as well as the interaction between the Ag 2 Se matrix and the CuAgSe secondary phase. This work indicates that introducing nano-twinned secondary phase in thermoelectric materials is a promising strategy for developing high-performance thermoelectric materials with high strength and plasticity.
研究领域:
材料科学
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热电学
·
机械工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·Vol. 48
·期 16
·23258-23265
·
IF 5.532
Jianlong Chai,Yabin Zhu,Xing Gao,Tielong Shen,Lijuan Niu,Shufen Li,Peng Jin,Minghuan Cui,Zhiguang Wang
Al 2 O 3 /SiC ceramic composites with different SiC contents have been prepared by powder metallurgy at 1600 °C for 120 min at 30 MPa pressure. The effect of second phase particles on the microstructure and mechanical properties of composites have been studied. The results show that SiC particle has a significant impact on the matrix subjected to residual stress, and on the microstructure of the composites as well. The average grain size of alumina matrix decreases as the SiC particle content increases. Simultaneously, it has been found that the mechanical properties of the material are significantly enhanced in comparison with monolithic Al 2 O 3 . The highest strength and toughness are obtained when the SiC content is 15 vol%, and the values are 1237 MPa and 5.68 MPa m 1/2 , respectively. The mechanisms of strengthening and toughening have been discussed.
研究领域:
材料科学
·
陶瓷学
·
复合材料工程
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固态物理
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粉末冶金
✓ 已验证
DOI
高影响因子
ACTA MATERIALIA
·
2025
·
IF 9.3
Ziming Zhang,Chen Ming,Qingfeng Song,Lei Wang,Hanbing Chen,Jincheng Liao,Chao Wang,Lidong Chen,Shengqiang Bai
Mg 3 (Sb,Bi) 2 -based Zintl compounds are rising stars with superior features of high thermoelectric (TE) performance, nontoxicity and low cost. However, the poor thermodynamic stability hinders its practical application. Here, we propose a design strategy of modulating the local chemical composition with grain boundary (GB) phase guided by computational phase equilibrium diagrams. By in-situ constructing ZrSb 1- x second phase in the GB regions of Mg 3 (Sb,Bi) 2 -based compounds, the migration of Mg is blocked and the Mg deletion is depressed. Benefit from these, the driving force of Mg diffusion from matrix to GB and Mg migration along GBs is weakened, resulting in an improved thermal stability without degradation of electrical transport properties. The fabricated 8-pair TE module using GB modulated n-type Mg 3.1 Sb 1.5 Bi 0.49 Te 0.01 and p-type Ge 0.89 Cu 0.06 Sb 0.08 Te presents an efficiency of 8.9 % under the temperature difference of 450 K and shows excellent durability in the thermal cycling test. This study provides an effective strategy to improve thermal stability by constructing GB phase, and proves the feasibility of the practical application for Mg 3 Sb 2 -based TE modules.
研究领域:
材料科学
·
热电材料
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固态化学
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计算材料学
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能源材料
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2025
·
IF 9.5
Hao Sun,Ruifeng Wu,Yafei Liu,Jia Chen,Jianan Xu,Xia Huang,Aimin Chang,Bo Zhang
Precise temperature sensing in extreme high-temperature environments, such as those encountered in energy and aerospace applications, demands high-performance thermosensitive materials, among which fergusonite-type oxide ceramics are prominent candidates. However, due to the complicated local structural design, simultaneously achieving rapid response/recovery, high sensitivity and accuracy under high-temperature conditions remains a challenge. Herein, second-phase precipitation (cubic CeO2) and B-site modulation were introduced in CaCe2Nb2−xTaxMoO12 ceramics by regulating solid solubility and sintering protocols. Synergistic optimization of grain boundaries and defect structure enabled carrier migration channels and precise thermal activation control. Exceptional temperature sensitivity and measurement accuracy were achieved over a broad temperature range (153–773 K), with a rapid response time of 1.82 s and recovery time of 0.76 s at 773 K. Notably, these ceramics demonstrate remarkable stability during thermal cycling and prolonged high-temperature operation. This work presents new material candidates and multiscale regulation strategies for developing high-temperature thermosensitive materials surpassing conventional ceramic systems.
研究领域:
材料科学
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无机非金属材料
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功能陶瓷
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传感器件
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高温材料工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2024
·
IF 4.2
Dezhi Wang,Yanzhen Lu,Ye Gao,Shuai Ma,Xin Li,Zhuangzhi Wu
With the rapid development of the photovoltaic industry, tungsten alloys have been selected to replace the high‑carbon steel to fabricate the busbars for diamond wire saws due to their superior mechanical properties, and the La 2 O 3 doped tungsten alloy has been widely used. However, the yield of eligible W alloy wires is not very high due to serious wire breakage problems during the production process, especially in the solid-liquid mixing route. To discover the possible reason, the commonly produced lanthanum tungstate (La 30 W 17 O 96 ) in the solid-liquid mixing route has been systematically studied in the work, and its possible influence on the mechanical properties is also explored. It is found that the La 30 W 17 O 96 leads to the formation of brittle second phases at grain boundaries (GBs), which weakens the intergranular bonding, resulting in a significant decrease in the compressive strength of tungsten alloys, manifested as intergranular fracture. Transmission electron microscopy (TEM) analysis reveals that these second phases are consisted of polycrystalline La 6 W 2 O 15 , La 2 W 3 O 12 and amorphous states, and the La 30 W 17 O 96 can decompose into a more stable structure during sintering. This work highlights the destructive effect of La 30 W 17 O 96 on the intrinsic properties of tungsten alloys and provides a new perspective for solving the problem of tungsten wire breakage.
研究领域:
材料科学
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冶金学
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机械工程
✓ 已验证
DOI
高影响因子
Science China-Materials
·
2023
·Vol. 66
·期 11
·4295-4305
·
IF 8.1
Rong Xudong,Li Yue,Chen Xiaofeng,Zhang Xiang,Zhao Dongdong,He Chunnian,Zhao Naiqin
Incorporating reinforcements can improve the mechanical properties of Al matrix composites but make them susceptible to corrosion attacks by facilitating the formation of a galvanic cell network along the interface. The optimization of the interfacial structure improves the corrosion resistance of the composites. Herein, a solid-state thermite reaction integrated with a heat treatment strategy was developed to create plain interfaces, encompassing the grain boundary (GB) and reinforcement–matrix interface, in an Al–CuO composite system. The intergranular corrosion behavior and susceptibility to stress corrosion cracking of the composite were comprehensively examined by immersion/electrochemical corrosion tests and microstructural characterizations. The intragranular distribution of nanosized secondary phases, i.e., Al 2 O 3 and precipitates, was investigated to address their contribution to the continuous galvanic cell detachment along the GBs and interruption of the corrosion path, thus boosting the corrosion duration. In addition, the tightly bonded Al 2 O 3 –Al interface with low strain energy distinctly lowers local susceptibility to corrosion. This study illuminates the correlation between interface characteristics and corrosion mechanisms in the composites, which can shed light on the development of high-corrosion-resistant composites.
研究领域:
材料科学
·
腐蚀工程
·
复合材料
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Kui Liu,Dainan Zhang,YiDa Lei,Yanlin Ma,Yuran Yang,Cheng Liu,Jie Li,Fang Xu,Huaiwu Zhang
Herein, the feasibility was assessed through first principles, and the effect of lithium excess on both the structure and dielectric properties of Li (1+ x )2 Mg 2 TiO 5 (0.000 ≤ x ≤ 0.200) ceramics was investigated by solid-phase reaction method. An appropriate excess of lithium can moderately inhibit the volatilization of lithium and reduce the production of the secondary phase MgTi 2 O 4 , though it cannot completely inhibit its production. Li (1+0.050)2 Mg 2 TiO 5 exhibits the best dielectric properties with ε r =14.55, Q × f =127,393 GHz (@9.6 GHz), and τ f = −19.91 ppm/°C. The influence of non-inherent factors on the dielectric properties is dominant, with the increase in relative density to 93.53 % and the growth in average grain size to 28.67 μm contributing to the reduction of dielectric loss. The decrease in ε r is due to the decrease in secondary phase content. Results from bond ionicity and Raman wavenumber variations in the intrinsic factors show that the intrinsic factors have little effect on the ε r . Whereas, the increase in lattice energy as well as the decrease in FWHM contribute to the decrease in dielectric loss. In addition, a proper excess of lithium helps to increase the bonding energy thereby optimizing the temperature stability. The optimized Li (1+0.050)2 Mg 2 TiO 5 has great potential for application in microwave communications.
研究领域:
材料科学
·
电气工程
·
陶瓷
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Bo Qiao,Liran Dong,Jie Zhang,Yanbo Shan,Lingkai Liu,Yuanwei Chao,Kexin Chen,Ning Wen
Silicon nitride (Si 3 N 4 ) is considered a potential material for biomedical implants due to its mechanical strength and biocompatibility. However, the presence of a glassy phase may affect osseointegration by potentially leading to ion release and altered surface wettability, among other effects. In this study, a surface modification method using molten NaOH was employed to remove the secondary phase and improve surface characteristics. The treated samples (N-SN) showed increased surface roughness and exposure of crystalline planes, which are associated with enhanced cell adhesion. In vitro experiments indicated that N-SN supported the proliferation and osteogenic differentiation of MC3T3-E1 preosteoblasts, with up-regulated expression of osteogenic marker genes such as ALP, Col-1, OPN, and Runx-2. In a Beagle dog mandible model, N-SN implants formed direct bone contact and newly formed bone tissue without evident inflammatory response, suggesting improved osseointegration. This surface treatment approach may provide a practical option for enhancing the bioactivity of Si 3 N 4 ceramics in orthopedic and dental applications.
研究领域:
生物医学工程
·
材料科学
·
牙科植入物
·
骨科
·
陶瓷材料
✓ 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）