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| 1 | The influence of Sc addition on microstructure and tensile mechanical properties of Mg-4.5Sn-5Zn alloys显示文摘The microstructure and tensile properties of the as-cast and as-rolled Mg-4.5Sn-5Zn alloys by adding various Sc content were investigated.Improvement of the tensile properties in as-cast Sc-containing alloys is attributed to the grain refinement and modification of secondary phase morphology.Three types of precipitates,namely spherical Mg2Sn,rod-like MgZn and Sc-rich phases were dispersed in the matrix of the Sc added M g-4.5Sn-5Zn alloys after hot rolling deformation.In addition,weakening and deflecting of the basal texture in as-rolled alloys were found and were attributed to Sc addition.Further increasing the Sc addition rate to 0.4 wt.%,however,resulted in the clustering of the Sc-rich phases and was found to reduce the tensile properties of the alloy,especially the elongation.The as-rolled Mg-4.5Sn-5Zn-0.3Sc alloy exhibits an optimum combination of tensile properties.The ultimate tensile strength,yield strength and elongation are 293.0MPa,164.2Mpa and 21.5%,respectively,and the elongation is about 68%higher than that of Sc-free alloy. | Pengqi Wang Enyu Guo Xuejian Wang Huijun Kang Zongning Chen Zhiqiang Cao Tongmin Wang | 2019 | Journal of Magnesium and Alloys2019，7，3： | 6 |
| 2 | Annealed microstructure dependent corrosion behavior of Ti-6Al-3Nb-2Zr-1Mo alloy显示文摘Corrosion resistance of titanium(Ti)alloys is closely connected with their microstructure which can be adjusted and controlled via different annealing schemes.Herein,we systematically investigate the specific effects of annealing on the corrosion performance of Ti-6 Al-3 Nb-2 Zr-1 Mo(Ti80)alloy in 3.5 wt.%NaCl and 5 M HCl solutions,respectively,based on open circuit potential(OCP),potentiodynamic polarization,electrochemical impedance spectroscopy(EIS),static immersion tests and surface analysis.Results indicate that increasing annealing tempe rature endows Ti80 alloy with a higher volume fraction ofβphase and finerαphase,which in turn improves its corrosion resistance.Surface characterization demonstrates thatβphase is more resistant to corrosion thanαphase owing to a higher content of Nb,Mo,and Zr in the former;additionally,the decreased thickness of a phase alleviates segregation of elements to further restrain the micro-galvanic couple effects betweenαandβphases.Meanwhile,the influential mechanisms of environmental conditions on corrosion of Ti80 alloy are discussed in detail.As the formation of a highly compact and stable oxide film on surface,annealed Ti80 alloys exhibit a low corrosion current density(10^(-6)A/cm^(2))and high polarization impedance(10^(6)Ω·cm^(2))in 3.5 wt.%NaCl solution.However,they suffer severe corrosion in 5 M HCl solution,resulting from the breakdown of native oxide films(the conversion of TiO_(2)to aqueous Ti^(3+)),active dissolution of substrate Ti to aqueous Ti^(3+)and existence of micro-galvanic couple effects.Those findings could provide new insights to designing Ti alloys with high-corrosion resistance through microstructural optimization. | Baoxian Su Liangshun Luo Binbin Wang Yanqing Su Liang Wang Robert O.Ritchie Enyu Guo Ting Li Huimin Yang Haiguang Huang Jingjie Guo Hengzhi Fu | 2021 | Journal of Materials Science & Technology2021，，3： | 5 |
| 3 | Microstructural characteristics and mechanical behavior of B4Cp/6061Al composites synthesized at different hot-pressing temperatures显示文摘B4Cp/6061Al composites have become important structural and functional materials and can be fabricated by powder metallurgy and subsequent hot rolling. In this work, the effects of the hot-pressing temperature on microstructures and mechanical behaviors of the B4Cp/6061Al composites were investigated. The results showed that compared with the T4 heat treated B4Cp/6061Al composite hot pressed at 560℃, the yield strength and failure strain of the composites hot pressed at 580℃ were increased to 235 MPa and 18.4%, respectively. This was associated with the interface bonding strength between the B4C particles and the matrix. However, the reaction products, identified to be MgAl2O4 phases, were detected in the composites hot pressed at 600℃. The formation of the MgAl2O4 phases resulted in the Mg depletion, thus reducing the yield strength to 203.5 MPa after the T4 heat treatment due to the effect of the solid solution strengthening being weakened. In addition, the variation of hardness and electrical conductivity was mainly related to the Mg content in the matrix. Based on the as-rolled microstructures observed by SEM, SR-μCT and fracture surfaces, the deformation schematic diagram was depicted to reflect the tensile deformation process of the composites. | Minqiang Gao Zongning Chen Huijun Kang Enyu Guo Rengeng Li Ying Fu Honglan Xie Tongmin Wang | 2019 | Journal of Materials Science & Technology2019，35，8： | 4 |
| 4 | Influence of deformation on the corrosion behavior of LZ91 Mg-Li alloy显示文摘The effect of rolling and forging on the microstructure and corrosion behavior of LZ91 alloy was investigated using an electron probe micro-analyzer,immersion and electrochemical tests.Results showed that the area fraction of theβ-Li phase remained unchanged,and the grain size of theβ-Li phase decreased after forging.The as-rolled forged alloy(FR-LZ91)exhibited the highest area fraction of theβ-Li phase and the longest grains.The corrosion resistance of the forged LZ91 alloy increased due to grain refinement that prevented further corrosion during the immersion test.Among the experimental alloys,FR-LZ91 showed the highest resistance of corrosion film and charge transfer resistance values due to its protective film caused by the high area fraction of theβ-Li phase. | Xueqin Liu Xuejian Wang Enyu Guo Zongning Chen Huijun Kang Tongmin Wang | 2023 | International Journal of Minerals,Metallurgy and Materials2023，30，1： | 3 |
| 5 | Enhancing mechanical properties and corrosion resistance of nickel-aluminum bronze via hot rolling process显示文摘The mechanical properties and corrosion behavior of as-cast, as-annealed and hot-rolled nickelaluminum bronze(NAB) alloy(Cu-9 Al-10 Ni-4 Fe-1.2 Mn, all in wt.%) in 3.5 wt.% Na Cl solution were investigated. The results show that annealing introduces a large number of k phases to precipitate in the k phase. However, after further hot rolling, the original continuous k phases are spheroidized and dispersed, increasing the strength, hardness, and elongation of the alloy. In addition to the enhanced mechanical properties, the corrosion resistance of the NAB samples is also improved significantly by hot rolling, as revealed by the mass loss measurements, electrochemical impedance spectroscopy(EIS), and cross-sectional corrosion morphology. Selective phase corrosion occurs by the preferential corrosion of the k phase, which acts as an anode to the k phases, and the uncorroded k phases are retained in the corrosion product film. The interfaces between the k phases and the surrounding corrosion products become discontinuous caused by the spheroidization of k phases, reducing the corrosion of the substrate by the corrosive medium via the channels. As a result, the corrosion rate and the maximum local corrosion depth of the hot-rolled NAB sample are greatly reduced. | Yanhua Zeng Fenfen Yang Zongning Chen Enyu Guo Minqiang Gao Xuejian Wang Huijun Kang Tongmin Wang | 2021 | Journal of Materials Science & Technology2021，，2： | 3 |
| 6 | Nanometer-scale gradient atomic packing structure surrounding soft spots in metallic glasses显示文摘The hidden order of atomic packing in amorphous structures and how this may provide the origin of plastic events have long been a goal in the understanding of plastic deformation in metallic glasses.To pursue this issue,we employ here molecular dynamic simulations to create three-dimensional models for a few metallic glasses where,based on the geometrical frustration of the coordination polyhedra,we classify the atoms in the amorphous structure into six distinct species,where“gradient atomic packing structure”exists.The local structure in the amorphous state can display a gradual transition from loose stacking to dense stacking of atoms,followed by a gradient evolution of atomic performance.As such,the amorphous alloy specifically comprises three discernible regions:solid-like,transition,and liquid-like regions,each one possessing different types of atoms.We also demonstrate that the liquid-like atoms correlate most strongly with fertile sites for shear transformation,the transition atoms take second place,whereas the solid-like atoms contribute the least because of their lowest correlation level with the liquid-like atoms.Unlike the“geometrically unfavored motifs”model which fails to consider the role of medium-range order,our model gives a definite structure for the so-called“soft spots”,that is,a combination of liquid-like atoms and their neighbors,in favor of quantifying and comparing their number between different metallic glasses,which can provide a rational explanation for the unique mechanical behavior of metallic glasses. | Binbin Wang Liangshun Luo Enyu Guo Yanqing Su Mingyue Wang Robert O.Ritchie Fuyu Dong Liang Wang Jingjie Guo Hengzhi Fu | 2018 | npj Computational Materials2018，，1： | 1 |
| 7 | Micro Hierarchical Structure and Mechanical Property of Sparrow Hawk (Accipiter nisus) Feather Shaf显示文摘In this study,the real 3D model of the feather shaft that is composed of medulla and cortex is characterized by X-ray computer tomography,and the structural features are quantitatively analyzed.Compression and tensile tests are conducted to evaluate the mechanical performance of the feather shaft and cortex at different regions.The analysis of the 3D model shows that the medulla accounts for∼70%of the shaft volume and exhibits a closed-cell foam-like structure,with a porosity of 59%.The cells in the medulla show dodecahedron and decahedron morphology and have an equivalent diameter of∼30μm.In axial compression,the presence of medulla enhances the shaft stability.Especially,the combined effect of the medulla and cortex increases the buckling strength of the middle and distal shaft by 77%and 141%,respectively,compared to the calculated value of the shaft using linear mixed rule.The tensile properties of the cortex along the shaft axis are anisotropic because of the different fiber structures.As the fiber orientation gradually becomes uniform in the axial direction,the Young’s modulus and tensile strength of the cortex on the dorsal gradually increase from calamus to the distal shaft,and the fracture mode changes from tortuous fracture to V-shaped fracture.The cortex on the lateral shows the opposite trend,that is the distal shaft becomes weaker due to fiber tangles. | Yichen Lu Zongning Chen Enyu Guo Xiangqing Kong Huijun Kang Yanjin Xu Rengeng Li Guohua Fan Tongmin Wang | 2021 | Computer Modeling in Engineering & Sciences2021，，5： | 0 |
| 8 | Comparative Study of Overseas Forest Carbon Financing Patterns and Its Inspiration on China显示文摘The role and position of forestry in response to the issue of climate change have been increasingly concerned by more and more countries and the international community.The cost incurred in forest carbon sequestration is lower than other options to mitigate climate change.However,the fund’s gap becomes the main barrier to reducing carbon emissions caused by deforestation and forest degradation(REDD) and enhancing carbon storage in forests(REDD +) and also becomes the concerns of governments,academic community and enterprises.Based on the comparative analysis of overseas forest carbon financing models,the paper pinpointed their development trend and proposed solutions to financing for forest carbon sink in China. | Guo Yanbin Zhang Caihong Guo Enyu Zhu Han | 2012 | Chinese Forestry Science and Technology2012，11，3： | 0 |
| 9 | Ultrasound-Assisted Solidifi cation of a Cu–Cr Alloy显示文摘Ultrasonic cavitation radiates huge power in a small solidifying bulk,leading to significant grain refinement,purification and homogenization of the final alloys.Ultrasound vibration has mostly been used for treating the solidification of light metals,but it is difficult to directly introduce ultrasonic vibration into copper alloy due to the lack of proper sonotrode.In this work,we have used a Sialon ceramic sonotrode to propagate acoustic waves in a Cu-Cr alloy melt.Significant grain refinement and modification of primary Cr have been obtained.With the ultrasound vibration treatment,the mechanical properties of the as-cast Cu-Cr alloy have been improved.The wear resistance of the Cu-Cr alloy has also shown enhancement with respect to the untreated alloy. | Siruo Zhang Huijun Kang Min Cheng Zongning Chen Zhicheng Wang Enyu Guo Jiehua Li Tongmin Wang | 2022 | Acta Metallurgica Sinica(English Letters)2022，35，12： | 0 |
| 10 | Monitoring Molecular Dynamics with Single-Molecule Electronic Devices and Fluorescence Techniques显示文摘Monitoring the dynamics of a single molecule provides unique insights into the fundamental physical and chemical properties of individual molecules.Over the past few decades,various approaches have been developed to enable the real-time and high-resolution detection at the single-molecule level.Among them,electrical and optical methods are the most promising tools,for the reason that electrical detection offers high resolution while optical technology provides non-invasive,targeted measurement with the added benefit of visualization.In this review,we summarized the current state-of-the-art electrical and optical techniques for single-molecule measurement and discussed their applications in detecting dynamic events such as conformational isomerizations,intermolecular interactions,chemical reactions,and biomolecular activities.In addition,we discussed the challenges and opportunities in this area and proposed possible directions for future development. | Lan Yang Zhizhuo Zhang Cong Zhao Yani Huo Enyu Zhang Suhang He Chuancheng Jia Xuefeng Guo | 2023 | Chinese Journal of Chemistry2023，41，21： | 0 |
| 11 | Top-down method to fabricate TiNi_(1+x)Sn half-Heusler alloy with high thermoelectric performance显示文摘The top-down method was used to fabricate the TiNi_(1+x)Sn half-Heusler alloy.Several knotty problems have been solved using the top-down method,including the generation of impurity phases,the visible discrepancy in the grain size of the TiNi_(2)Sn second phase,and irregular variations in the Seebeck coefficient(S),electrical conductivity(σ),and thermal conductivity(κ)with increasing Ni content.The generation of a large number of incoherent interfaces between the half-Heusler(HH)and full-Heusler(FH)phases fabricated by the top-down method drastically improved and retained κ and S,thereby leading to an enhancement in the dimensionless figure of merit(ZT)by~19%for the TiNi_(1.05)Sn sample as compared to the ZT of the samples prepared by the conventional method. | Xiong Yang Daquan Liu Jianbo Li Ruonan Min Huijun Kang Li Linwei Zongning Chen Enyu Guo Tongmin Wang | 2021 | Journal of Materials Science & Technology2021，，28： | 0 |
| 12 | Effect of Extrusion Temperature on the Mechanical Properties and Corrosion Behavior of LZ91 Alloys显示文摘Microstructural observations,tensile tests,potentiodynamic polarization measurements,and corrosion morphology examinations are conducted to investigate the effect of extrusion temperature on the mechanical properties and corrosion behavior of LZ91 alloys.The results show that the tensile strength of the LZ91 alloy is increased by 86 MPa after extrusion at 25℃.Meanwhile,the corrosion resistance is improved by about 2.7 times,and the maximum corrosion depth is decreased by 60μm.The increase in the tensile strength can be mainly attributed to theα-Mg precipitate strengthening inβ-Li.The improvement of the corrosion resistance is due to the fact that the nano-sized MgLiZn and refinedα-Mg precipitates inβ-Li weaken the effect of the cathodic phase on micro-galvanic corrosion,thereby decreasing the cathodic current density and local corrosion susceptibility.However,when the extrusion temperature is increased to 300°C,the corrosion rate is significantly accelerated due to the increase of the micro-galvanic corrosion caused byα-Mg precipitate coarsening at high temperatures. | Xuejian Wang Huaqiang Xiao Keqiang Su Bo Lin Tongmin Wang Enyu Guo | 2023 | Acta Metallurgica Sinica(English Letters)2023，36，11： | 0 |
| 13 | Thermo-driven oleogel-based self-healing slippery surface behaving superior corrosion inhibition to Mg-Li alloy显示文摘Bioinspired by Nepenthes, lubricant infused surfaces(LIS) have attracted widespread attention in the field of anticorrosion. However,the lubricant coating has some disadvantages such as complex construction processing and easy loss of oil phase in air or dynamic water phase. In this study, oleogel is infused into a lotus leaf inspired super-hydrophobic matrix to form an oleogel infused surface(OIS) for enhancing corrosion resistance of active Mg-Li alloy. For reserving oleogel, firstly, a facile one-step electrodeposition method is used to construct super-hydrophobic surface(SHS) composed by samarium/myristic acid complex micro-nano flower structure onto Mg-Li alloy.The coating exhibits excellent superhydrophobic property at a static contact angle of 160° by applying 30 V electrolysis for 30 min. The protection efficiency of single SHS highly relates with the metal itself. For short period immersion in water phase, SHS can afford protection to Mg-Li alloy. However, the long-term immersion will see the rapid failure of SHS, and the high activity of Mg-Li alloy is one main reason.We assume that SHS cannot be a good choice for protecting Mg-Li alloy. Then, a Nepenthes inspired liquid coating is formed by infusing oleogel into the micro-nano structure by a spin-coating method. The liquid coating performs prominent corrosion resistance with Rctreaching as high as 1.51 × 10^(10)Ω cm^(2). After the mechanical damage from the external environment, the liquid coating can realize self-repair through thermal assistance, and the liquid coating can still restore Rctup to 1.24 × 10^(10)Ω cm^(2) after healing. The corrosion resistance of the liquid coating remains strong by showing Rctas high as 1.14 × 10^(9)Ω cm^(2), even after immersion in representative corrosive 3.5 wt% Na Cl solution for 30 d. | Yibo Ouyang Huijun Kang Enyu Guo Ri Qiu Keqiang Su Zongning Chen Tongmin Wang | 2023 | Journal of Magnesium and Alloys2023，11，12： | 0 |
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