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Effects of Sb Addition on Microstructural Evolution and Mechanical Properties of Mg–9Al–5Sn Alloy

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Acta Metallurgica Sinica(English Letters) 2021年第2期34卷 278-288页

作者： Chun-Hua Ma Fu-Sheng Pan Ding-Fei Zhang ai-tao tang Zhi-Wen Lu College of Materials Science and Engineering Chongqing UniversityChongqing 400045China College of Mechanical and Electronic Engineering Nanyang Normal UniversityNanyang 473061China

The Mg–9Al–5Sn-xSb(x=0.0,0.3,0.6,1.0,1.5 wt%)alloys were prepared by a simple alloying process followed by hot extrusion with an extrusion ratio of *** effects of Sb additions on the microstructure and mechanical properties of the Mg–9 Al–5 Sn alloys were investigated by optical microscopy,X-ray diffraction,transmission electron microscopy,scanning electron microscopy equipped with an energy-dispersive X-ray *** results indicated that the phasesα-Mg matrix,Mg2Sn,Mg_(3)Sb_(2) and Mg17 Al12 exist in the as-cast Sb-containing *** addition results in the precipitation of Mg_(3)Sb_(2).The dendritic size of these alloys decreases with the addition of *** their ultimate tensile strength and yield strength of extruded alloys increase,and their elongation decreases gradually with increasing the content of *** better mechanical properties of the as-extruded alloys were achieved due to the refined grains and the formation of dispersive second phases Mg_(3)Sb_(2).

关键词： Mg–Al–Sn–Sb alloy Microstructure Extrusion Second phase Mechanical properties

Improved Corrosion Resistance in AZ61 Magnesium Alloys Induced by Impurity Reduction

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Acta Metallurgica Sinica(English Letters) 2020年第2期33卷 225-232页

作者： Yan Dai Xian-Hua Chen tao Yan ai-tao tang Di Zhao Zhu Luo Chun-Quan Liu Ren-Ju Cheng Fu-Sheng Pan College of Materials Science and Engineering Chongqing UniversityChongqing 400045China Chongqing Academy of Science and Technology Chongqing 401123China

The effect of impurity element Fe on corrosion behavior of AZ61 magnesium alloys in various states has been investigated by immersion test and hydrogen evolution measurements in 3.5% sodium chloride *** corrosion rate is found to relay on the impurity Fe concentration in the alloys and decreases with decreasing Fe *** Fe content drops from 150 ppm to 10 ppm,the corresponding corrosion rates under as-cast and solution treatment conditions are reduced from 8.54 mm/a and 8.61 mm/a to 2.54 mm/a and 0.21 mm/a,*** corrosion pattern of the AZ61 alloys is the localized corrosion,and the galvanic couples are formed among the impurity particles,second-phase particles and the *** Fe impurity particles tend to act as main cathodic to form micro-galvanic cell with the α-Mg matrix,which is harmful for corrosion resistance of AZ61 alloy.

关键词： AZ61 magnesium alloy Impurity Fe Corrosion rate

Influence of Continuous Bending Process on Texture Evolution and Mechanical Properties of AZ31 Magnesium Alloy

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Acta Metallurgica Sinica(English Letters) 2018年第3期31卷 225-233页

作者： Ting-Zhuang Han Guang-Sheng Huang Lun Huang Bin Jiang Guan-Gang Wang ai-tao tang Fu-Sheng Pan State Key Laboratory of Mechanical Transmission College of Materials Science and Engineering Chongqing University National Engineering Research Center for Magnesium Alloys Chongqing University Chongqing Research Center for Advanced Materials Chongqing Academy of Science & Technology

Mg-3Al-lZn alloy sheets have been deformed by continuous bending（CB）to investigate the effects of pro-cessing parameters（bending angle and repetitive passes）on the texture and *** samples exhibited a bimodal microstructure with abnormal growth grains in the surface region and fine grains distributed in the center after CB process followed by *** texture evolution measured by XRD indicated that the basal poles were rotated from ND toward RD,and the texture intensity decreased with the bending angle decreasing and repetitive passes *** with the as-received sample,the yield strength of CBA-120-2 sample significantly decreased from 183 to 112 MPa,and a smaller r-value and a larger n-value were *** formability of CB processed samples in annealing condition was significantly enhanced with the highest of Erichsen value of 5.4 mm,increased by about 135%.The improvement of formability was likely attributed to the weakened and RD-tilt basal texture and coarse grains in the surface part.

关键词： Magnesium alloy Continuous bending Microstructure Texture Stretch formability

Morphology,structure and corrosion resistance of Mg-Al LDH films fabricated in different Al^(3+)concentration solutions

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Rare Metals 2023年第2期42卷 697-704页

作者： Liang Wu Xing-Xing Ding Xiao-Feng Zhao Yuan-Huan Liu Xue-Long Hao ai-tao tang Gen Zhang Fu-Sheng Pan School of Materials Science and Engineering Chongqing UniversityChongqing400044China National Engineering Research Center for Magnesium Alloys Chongqing UniversityChongqing400044China SunRui Marine Environment Engineering Company Ltd Qingdao266101China National Center of Analysis and Testing for Nonferrous Metals and Electronic Materials General Research Institute for Nonferrous MetalsBeijing100088China

In situ-grown Mg-Al layered double hydroxide(LDH)films were obtained on an anodized AZ31 substrate,with the immersion of sample in different concentrations of Al^(3+)*** structure,composition and morphology of LDH films were investigated by X-ray diffraction(XRD),Fourier transform infrared(FTIR)and scanning electronic microscopy(SEM),and the corrosion behavior of LDH films was further studied by electrochemical impedance spectroscopy(EIS).The influence of Al^(3+)concentration on the growth behavior of LDH was also *** results indicated that the nest-like structure of MgAl-LDH film was composed of interconnected MgAl-LDH ***,the LDH obtained in0.032 mol·L^(-1)Al^(3+)solution,possessing dense laminated structure,could effectively seal the porous surface of anodic oxide *** results revealed that the samples coated with LDH films showed a higher electrochemical impedance,and thus,the corrosion resistance of samples coated with LDH films was signally improved compared with the anodized alloy.

关键词： Magnesium alloy In situ method Layered double hydroxide(LDH)films Al^(3+)concentration Corrosion resistance

Effect of milling time on carbothermic reduction of ilmenite

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Transactions of Nonferrous Metals Society of China 2015年第12期25卷 4201-4206页

作者：陈敏汤爱涛肖玄攀枝花学院材料工程学院攀枝花617000 重庆大学材料科学与工程学院重庆400044

A systematic investigation on the effect of milling time on carbothermic reduction of ilmenite was carried out by a combination of thermal analysis, X-ray diffraction（XRD）, scanning electron microscopy（SEM） and particle size analysis. It was shown that the graphite crystalline structure was easily destroyed along the（002） crystal plane during milling process. The particle size of ilmenite/graphite mixture was largely decreased and a fully mixed composite structure was obtained after milling for 4 h at high milling intensity. Milling exerts positive effect on the decreasing temperatures of ilmenite reduction and gradual deoxidizing of titanium oxides was completed.

关键词： milling time carbothermic reduction ilmenite

Microstructure Distribution and Tensile Anisotropy of Dissimilar Friction Stir Welded AM60 and AZ31 Magnesium Alloys

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Acta Metallurgica Sinica(English Letters) 2020年第11期33卷 1487-1504页

作者： Jun-Lei Zhang Han Liu Yu-Lu Xie Guang-Sheng Huang Xiang Chen Bin Jiang ai-taotang Fu-Sheng Pan State Key Laboratory of Mechanical Transmission College of Materials Science and EngineeringChongqing UniversityChongqing 400044China National Engineering Research Center for Mg Alloys Chongqing UniversityChongqing 400044China

The microstructure distribution,tensile anisotropy and fracture behaviors in the dissimilar friction stir welded joint of AM60/AZ31 alloys were *** results showed that a significant grain refinement and an orientation fluctuation occurred in the *** grain size of AZ31 side in joint was obviously smaller than that of AM60 *** was a higher percentage of low angle grain boundaries(LAGBs)and a lower degree of recrystallization in AZ31 side compared with those in AM60 side,especially for the thermo-mechanically affected zone in AZ31 *** discrepancies of grain size distribution,recrystallization behavior and LAGBs in joint depended on the different initial state of two metals and the inhomogeneous temperature distribution in *** addition,the(0001)basal plane in weld was roughly parallel to the surface of the pin,showing the symmetrically distributed texture *** joint showed an obvious tensile anisotropy due to the special texture *** comprehensive tensile properties of joint along the three directions decreased in the order:welding direction,45°direction and transverse *** maximum ultimate tensile strength,yield strength and elongation of the joint were 242 MPa,116 MPa and 21.2%,*** fluctuations of grain size and texture in joint affected the fracture behavior of samples in the three directions.

关键词： Friction stir welding Dissimilar joint Texture Anisotropy Tensile properties

Influence of Sn addition on mechanical properties of gas tungsten arc welded AM60 Mg alloy sheets

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Transactions of Nonferrous Metals Society of China 2016年第8期26卷 2051-2057页

作者： Jun GOU ai-tao tang Fu-sheng PAN Jia SHE Su-qin LUO Jun-hua YE Da-wei SHI College of Materials Science and Engineering Chongqing University Chongqing 400044 China National Engineering Research Center for Magnesium Alloys Chongqing University Chongqing 400044 China Chongqing Academy of Science and Technology Chongqing 401123 China Science and Technology on Reactor System Design Technology Laboratory College of Materials Science and Engineering Guilin University of Technology Guilin 541004 China

The effects of Sn addition on the microstructure and mechanical properties of gas tungsten arc butt-welded Mg?6Al?0.3Mn (AM60) (mass fraction, %) alloy sheets were investigated by optical microscopy, scanning electron microscopy, X-ray diffraction, transmission electron microscopy, and microhardness and tensile tests. The results indicate that both the average microhardness and joint efficiency of AM60 are improved by the addition of 1% Sn (mass fraction). The ultimate tensile strength of Mg?6Al?1Sn?0.3Mn (ATM610) reaches up to 96.8% of that of base material. Moreover, fracture occurs in the fusion zone ofATM610 instead of in the heat-affected zone of AM60 welded joint. The improvement in the properties is mainly attributed to the formation of Mg2Sn, which effectively obstructs the grain coarsening in the heat-affected zone, resulting in a relatively finemicrostructure. The addition of 1% Sn improves the mechanical properties of AM60 welded joint

关键词： AM60 Mg alloy ATM610 Mg alloy gas tungsten arc welding mechanical properties

Simultaneous improvement in strength and ductility of extruded Mg alloy via novel closed forging extrusion

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Transactions of Nonferrous Metals Society of China 2022年第9期32卷 2866-2876页

作者： Kun-ming ZHANG Chen QIN Jia SHE Xue-rui JING Peng PENG ai-tao tang Muhammad RASHAD Fu-sheng PAN College of Materials Science and Engineering Chongqing UniversityChongqing 400044China National Engineering Research Center for Mg Alloys Chongqing UniversityChongqing 400044China School of Metallurgy and Materials Engineering Chongqing University of Science and TechnologyChongqing 401331China Bernal Institute Department of Chemical SciencesUniversity of LimerickLimerickV94 T9PXIreland School of Materials Science and Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China

A novel continuous plastic process employed on AZ31 Mg alloy called closed forging extrusion(CFE)was *** optical microscopy,scanning electron microscopy,electron back-scatter diffraction and tensile and compressive tests were employed to investigate the microstructure evolution and strengthening *** results indicated that the CFE-process can promote dynamic recrystallization(DRX),eliminate the coarsen unDRXed grain regions,refine the grains effectively,and improve the strength,plasticity and anisotropy of the *** grain refinement was mainly attributed to the stress,which facilitated the nucleation of recrystallization and refined the microstructure via the *** fully DRXed ultrafine grained structure improved the strength and plasticity *** 60 s closed forging and continuous extrusion,the alloy exhibits relatively high TYS,UTS,CYS,elongation and yield asymmetry of 305 MPa,337 MPa,295 MPa,27%and 0.97,respectively.

关键词： Mg alloys extrusion mechanical properties

Grain refinement and mechanical properties of pure aluminum processed by accumulative extrusion bonding

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Transactions of Nonferrous Metals Society of China 2019年第3期29卷 437-447页

作者： Xiang CHEN Guang-sheng HUANG Shuai-shuai LIU Ting-zhuang HAN Bin JIANG ai-tao tang Yun-tian ZHU Fu-sheng PAN State Key Laboratory of Mechanical Transmission College of Materials Science and Engineering Chongqing University Chongqing 400044 China National Engineering Research Center for Magnesium Alloys Chongqing University Chongqing 400044 China Department of Materials Science and Engineering North Carolina State University Raleigh NC 27695 USA

Ultrafine-grained aluminum processed by a new severe plastic deformation technique, accumulative extrusion bonding (AEB), was investigated. Microstructural characterization indicated good interfacial bonding and an average grain size of ~440 nm was obtained after six passes. Tensile testing revealed that the strength reached the maximum value of 195 MPa and the total elongation exceeded 16% after five passes. The hardness was also significantly improved and almost reached saturation after the first pass. SEM fractography of AEB-processed specimens after tensile test showed that failure mode was shear ductile fracture with elongated shallow dimples. Comparison with conventional accumulative roll bonding indicates that this new AEB technique is more effective in refining grain and improving mechanical properties of the specimens.

关键词： aluminum accumulative extrusion bonding microstructure mechanical properties strain hardening rate