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Tailoring the Microstructure and Mechanical Property of Mg-Zn Matrix Composite via the Addition of Al Element

Acta Metallurgica Sinica(English Letters) 2024年第3期37卷 438-452页

作者： Chong Wang Fuyuan Liu Xuejian Wang Enyu Guo Zelong Du Kunkun Deng zongning chen Huijun Kang Guohao Du Tongmin Wang Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024China School of Mechanical Engineering Guizhou UniversityGuiyang 550025China Ningbo Institute of Dalian University of Technology Ningbo 315000China Shanxi Key Laboratory of Advanced Magnesium-Based Materials College of Materials Science and EngineeringTaiyuan University of TechnologyTaiyuan 030024China Shanghai Synchrotron Radiation Facility Shanghai Advanced Research Institute CASShanghai 201204China

The semi-solid stir casting method is adopted to prepare 10 wt%SiC_(p)/Mg-6Zn-0.5Ca-xAl(x=0,1,3 and 5 wt%)composites,and the microstructure evolution and mechanical property of composites with various Al content are investigated.The results show that the addition of 3 wt%Al improves the distribution of SiC_(p),whereas the SiC_(p) cluster occurs again with Al content greater than 3%.An abnormal phenomenon of twinning is observed in the cast composites in this work.The SiC_(p)/Mg-6Zn-0.5Ca composite possesses the highest twin content of~23%,for which tension twins(TTW)and compression twins(CTW)account for~19%and~3%,respectively.The CTW is only observed in ZXA600 composite.The addition of Al has an inhibiting effect for the generation and growth of twins.The content of twin decreases firstly and then increases with increase of Al content.The lowest twin content is obtained as Al increases to 3 wt%.It is found the existence of twin is detrimental to the mechanical property of composites.As-cast SiC_(p)/Mg-6Zn-0.5Ca-3Al composite with the lowest twin content exhibits the optimal mechanical property of yield strength,ultimate tensile strength and elongation for 100 MPa,188 MPa and 4.4%,respectively.The outstanding mechanical property is attributed to the uniform distribution of SiC_(p),the low twin content and the well-distributed fine second phases.

关键词： Mg matrix composite Synchrotron tomography Twinning Liquid melt processing Mechanical property

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Influence of deformation on the corrosion behavior of LZ91 Mg-Li alloy

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International Journal of Minerals,Metallurgy and Materials 2023年第1期30卷 72-81页

作者： Xueqin Liu Xuejian Wang Enyu Guo zongning chen Huijun Kang Tongmin Wang Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024China Ningbo Institute of Dalian University of Technology Ningbo 315000China

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.

关键词： magnesium lithium alloy deformation electrochemical test corrosion behavior

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Thermo-driven oleogel-based self-healing slippery surface behaving superior corrosion inhibition to Mg-Li alloy

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Journal of Magnesium and Alloys 2023年第12期11卷 4710-4723页

作者： Yibo Ouyang Huijun Kang Enyu Guo Ri Qiu Keqiang Su zongning chen Tongmin Wang Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024PR China Ningbo Institute of Dalian University of Technology Ningbo 315000PR China College of Safety and Environmental Engineering Shandong University of Science and TechnologyQingdao 266590PR China State Key Laboratory for Marine Corrosion and Protection Luoyang Ship Material Research InstituteQingdao 266101PR China Institute of Yellow River Delta Earth Surface Processes and Ecological Integrity Shandong University of Science and TechnologyPR China

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.

关键词： Mg-Li alloy Oleogel Superhydrophobic Self-healing Corrosion

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Ultrasound-Assisted Solidifi cation of a Cu–Cr Alloy

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Acta Metallurgica Sinica(English Letters) 2022年第12期35卷 2082-2088页

作者： Siruo Zhang Huijun Kang Min cheng zongning chen Zhicheng Wang Enyu Guo Jiehua Li Tongmin Wang Key Laboratory of Solidifi cation Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024China Ningbo Institute of Dalian University of Technology Ningbo 315000China Institute of Casting Research Montanuniversitat Leoben8700LeobenAustria

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.

关键词： Cu-Cr alloys Microstructure Ultrasonic vibration Acoustic cavitation Solidification process

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Enhancing mechanical properties and corrosion resistance of nickel-aluminum bronze via hot rolling process

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Journal of Materials Science & Technology 2021年第2期61卷 186-196页

作者： Yanhua Zeng Fenfen Yang zongning chen Enyu Guo Minqiang Gao Xuejian Wang Huijun Kang Tongmin Wang Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024China

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.

关键词： Nickel-aluminum bronze Hot rolling Mass loss EIS Selective phase corrosion

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Microstructural characteristics and mechanical behavior of B4Cp/6061Al composites synthesized at different hot-pressing temperatures

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Journal of Materials Science & Technology 2019年第8期35卷 1523-1531页

作者： Minqiang Gao zongning chen Huijun Kang Enyu Guo Rengeng Li Ying Fu Honglan Xie Tongmin Wang Key Laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024 China Engineering Institute Bohai UniversityJinzhou 121013 China Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201204 China

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.

关键词： B4Cp/6061Al composite Hot-pressing temperature Microstructure Mechanical behavior Reaction product

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The influence of Sc addition on microstructure and tensile mechanical properties of Mg-4.5Sn-5Zn alloys

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Journal of Magnesium and Alloys 2019年第3期7卷 456-465页

作者： Pengqi Wang Enyu Guo Xuejian Wang Huijun Kang zongning chen Zhiqiang Cao Tongmin Wang Key Laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province)School of Materials Science and EngineeringDalian University of TechnologyDalian 116024PR China

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.

关键词： Magnesium alloys Scandium Microstructure Mechanical properties

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Top-down method to fabricate TiNi_(1+x)Sn half-Heusler alloy with high thermoelectric performance

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Journal of Materials Science & Technology 2021年第28期87卷 39-45页

作者： Xiong Yang Daquan Liu Jianbo Li Ruonan Min Huijun Kang Li Linwei zongning chen Enyu Guo Tongmin Wang Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024China School of Physics and Electronic Information Hulunbeier UniversityInner Mongolia 021008China Ningbo Institute of Dalian University of Technology Ningbo 315000China

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.

关键词： n-type TiNi_(1+x)Sn Thermoelectric Thermal conductivity Incoherent interfaces Electrical conductivity

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Grain nucleation and growth behavior of a Sn-Pb alloy affected by direct current： An in situ investigation

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Journal of Materials Science & Technology 2017年第10期33卷 1134-1140页

作者： Fenfen Yang zongning chen Fei Cao Rong Fan Huijun Kang Wanxia Huang Qingxi Yuan Tiqiao Xiao Yanan Fu Tongmin Wang Key Laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province) School of Materials Science and Engineering Dalian University of Technology Dalian 116024 China School of Chemical Engineering Dalian University of Technology Dalian 116024 China School of Automotive Engineering Dalian University of Technology Dalian 116024 China Beijing Synchrotron Radiation Facility Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China Shanghai Synchrotron Radiation Facility Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201204 China

In situ synchrotron X-ray radiography was used to study the effect of direct current（DC） on the grain nucleation and growth of Sn-50 wt.%Pb alloy. The results showed that applying DC adequately during solidification could effectively enhance the grain nucleation and inhibit its growth. Imaging of comparative experiments with varying DC intensity indicated that the final grain size, determined by the competition between grain nucleation and growth, was sensitively dependent on the DC intensity. It was found that the average grain size was decreased from 1632 to 567 μm with DC density of 1.5 A/mm^2 compared to the case without DC. Beyond this value, raising the current density may cause a significant decrease in the nucleation rate, and thus lead to a coarsening of the grain structure.

关键词： Sn-Pb alloy Synchrotron X-ray radiography Solidification Microstructure Electric current

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Micro Hierarchical Structure and Mechanical Property of Sparrow Hawk (Accipiter nisus) Feather Shaf

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Computer Modeling in Engineering & Sciences 2021年第5期127卷 705-720页

作者： Yichen Lu zongning chen Enyu Guo Xiangqing Kong Huijun Kang Yanjin Xu Rengeng Li Guohua Fan Tongmin Wang Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian116024China School of Civil Engineering Liaoning University of TechnologyJinzhou121001China AVIC Manufacturing Technology Institute Beijing100024China Key Laboratory for Light-Weight Materials Nanjing Tech UniversityNanjing211816China

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.

关键词： Biomechanics feather shaft structure mechanical properties tomography

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