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A comparison of the microstructure-dependent corrosion of dual-structured mg-li alloys fabricated by powder consolidation methods:Laser powder bed fusion vs pulse plasma sintering

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Journal of Magnesium and alloys 2022年第12期10卷 3553-3564页

作者： Anna Dobkowska Łukasz Zrodowski Monika Chlewicka Milena Koralnik Bogusława Adamczyk-Cieslak Jakub Ciftci Bartosz Moronczyk Mirosław Kruszewski Jakub Jaroszewicz Dariusz Kuc Wojciech Swieszkowski Jarosław Mizera Faculty of Materials Science and Engineering Warsaw University of Technology141 Woloska02-507 WarsawPoland Institute of Materials Engineering Silesian University of TechnologyKrasinskiego 840-019 KatowicePoland

In this study, powder metallurgy methods were used to fabricate mg-7.5li-3Al-Zn alloys from repowdered extruded alloys. Extruded alloys were powdered using ultrasonic atomization, and then laser powder bed fusion(LPBF) and pulse plasma sintering(PPS) were used to consolidate the bulk materials. A comparison of the properties of the fabricated alloys with those of a conventionally extruded one was carried out using methods that characterized the microstructure and corrosion resistance. When compared to their conventionally extruded counterpart, LPBF and PPS materials exhibited refined microstructures with low enrichment in Al li and coarse Al, Zn, Mn precipitates. The main drawback of the LPBF alloy, printed for the needs of this study, was its porosity, which had a negative effect on its corrosion. The presence of unrecrystallized particle boundaries in the PPS alloy was also unbeneficial with regard to corrosion. The advantage of the LPBF and PPS processes was the ability to change the proportion of α(mg) to β(li), which when the complete consolidation of the material is achievable, may increase the corrosion resistance of dual-structured mg-li alloys. The results show that powder metallurgy routes have a wide potential to be used for the manufacture of mg-li based alloys.

关键词： Additive manufacturing Laser Powder Bed Fusion(LPBF) Pulse Plasma Sintering(PPS) Corrosion mg-li alloys

Influence of Rare Earth Elements on Microstructure and Mechanical Properties of mg-li alloys

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Journal of Rare Earths 2006年第6期24卷 797-800页

作者：王涛张密林牛中毅刘滨 College of Materials Science and Chemical Engineering Harbin Engineering University Harbin 150001 ChinaCollege of Materials Science and Engineering Jiamusi University Jiamusi 154007China College of Materials Science and Chemical Engineering Harbin Engineering University Harbin 150001 China

A series of a-based mg-li-A1-Zn-xRE alloys were prepared. These alloys have low density ranging from 1.5 to 1.7 g·cm^-3 and high strength properties. The influence of RE element on the microstructure and the mechanical properties of these alloys were studied. The results indicate that the addition of RE （La, Pr, Ce） leads to the formation of rodshaped intermetallic compound Al2Zn2La distributed in the matrix. Al2Zn2La induces reduction of the laminar spacing and causes refinement of the microstructure. Therefore, this compound improves the strength of alloys at a high temperature.

关键词： mg-li alloys high temperature properties rare earths

Micro-arc oxidation coatings on mg-li alloys

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Rare Metals 2009年第2期28卷 160-163页

作者： Xu Yongjun li Kang Yao Zhongping Jiang Zhaohua Zhang Milin Harbin Inst Technol Dept Appl Chem Harbin 150001 Peoples R China Harbin Engn Univ Key Lab Minist Educ Super Light Mat & Surface Technol Harbin 150001 Peoples R China

Micro-arc oxidation (MAO) method was used for the surface modification of an mg-5wt.%li alloy. Ceramic coatings were in-situ fabricated on the mg-li alloy. The morphology feature,phase composition,and corrosion-resistance of the formed ceramic coatings were studied by SEM,XRD,and electrochemical methods,respectively. The results showed that the coatings produced in a sodium silicate solution system were composed of mgO and mg2SiO4. The ceramic coating became thicker and the content of mg2SiO4 phase increase...

关键词： mg-li alloys ceramic coatings micro-arc oxidation corrosion resistance

Preparation of mg-li alloys by electrolysis in molten salt at low temperature

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Chinese Chemical Letters 2007年第3期18卷 329-332页

作者： Mi lin Zhang Yong De Yan Zhi Yao Hou Lu An Fan Zeng Chen Ding Xiang Tang College of Materials Science and Chemical Engineering Harbin Engineering University Harbin 150001 China

A new technology for preparation of low cost mg-li alloys was studied. The alloys were prepared by electrolysis in molten liCl-KCl （weight ratio is 1：1） electrolyte with mg rod severing as the consumed cathode. Main factors that affect current efficiency were investigated, and optimal electrolysis parameters were obtained. mg-li alloys with low lithium Content （about 25%） were prepared by the unique method of a higher post-thermal treatment temperature after electrolysis at low temperature. The results showed that the electrolysis can be carried out at low temperature, which resulted in reducing preparation cost due to energy saving. The new technology for the oreoaration of mg-li alloy by electrolysis in molten salt was laroved to be feasible.

关键词： mg-li alloys Molten salt electrolysis Low temperature Current efficiency

Microstructure and Corrosion Properties of Duplex-Structured Extruded mg-6li-4Zn-xMn alloys

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Acta Metallurgica Sinica(English Letters) 2022年第5期35卷 867-878页

作者： Minmin li Zhe Qin Yan Yang Xiaoming Xiong Gang Zhou Xiaofei Cui Bin Jiang Xiaodong Peng Fusheng Pan National Engineering Research Center for Magnesium alloys Chongqing UniversityChongqing400044China State Key Laboratory of Mechanical Transmissions College of Materials Science and EngineeringChongqing UniversityChongqing400044China International Joint Laboratory for light alloys(MOE) College of Materials Science and EngineeringChongqing UniversityChongqing400044China

The extruded mg-6 li-4 Zn-xMn(x=0,0.4,0.8,1.2 wt%)alloys were prepared,and the microstructure of the test alloys was investigated by optical microscopy,scanning electron microscopy and transmission electron *** corrosion properties were determined by electrochemical measurements and immersion measurements in 3.5%NaCl *** results indicate that the extruded mg-6 li-4 Zn-xMn alloys are mainly composed ofα-mg phase,β-li phase,Mn precipitates and some intermetallic compounds(mgli_(2)Zn).With the addition of Mn,stable corrosion products were formed on the surface of the test alloy,which can effectively inhibit further corrosion progress and improve the corrosion ***-6 li-4 Zn-1.2 Mn alloy exhibits the best corrosion resistance,attributed to grain refinement,the improvement of the stability of corrosion product film and uniform distribution of fine second phases.

关键词： mg-li alloys Microstructure Extruded Corrosion resistance property

Effects of icosahedral phase on mechanical anisotropy of as-extruded mg-14li (in wt%) based alloys

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Journal of Materials Science & Technology 2019年第11期35卷 2477-2484页

作者： Chuanqiang li Daokui Xu Baojie Wang liyuan Sheng Ruizhi Wu Enhou Han Peking University Shenzhen InstituteShenzhen Key Lab Human Tissue Regenerate&RepairShenzhen 518057China Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials and Energy Guangdong University of TechnologyGuangzhou 510006China School of Environmental and Chemical Engineering Shenyang Ligong UniversityShenyang 110159China Key Laboratory of Superlight Materials&Surface Technology Ministry of EducationHarbin Engineering UniversityHarbin 150001China

Through investigating and comparing microstructure and crystallographic texture of as-extruded mg-14li and mg-14li-6Zn-1Y(in wt%)alloys,the differences in their mechanical anisotropy were *** revealed that the formation of I-phase(mg3Zn6Y,icosahedral structure)can effectively refine grain ***,compared with mg-14li alloy,the texture type of mg-14li-6Zn-1Y alloy changed slightly,but its texture intensity decreased *** a result,the stronger texture contributed to the"normal"mechanical anisotropy of mg-14li alloy with higher tensile strength and a lower elongation ratio along transverse direction(TD)than those along extrusion direction(ED).However,for mg-14li-6Zn-1Y alloy,the zonal distribution of I-phase particles along ED caused"abnormal"mechanical anisotropy,*** tensile strength and better plasticity along ED.

关键词： mg-li alloys Texture I-phase Mechanical anisotropy Fracture

Effect of stannum addition on microstructure of as-cast and as-extruded mg-5li alloys

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Transactions of Nonferrous Metals Society of China 2011年第11期21卷 2378-2383页

作者：蒋斌殷恒梅杨青山李瑞红潘复生重庆大学材料科学与工程学院重庆400044 国家镁合金材料工程技术研究中心重庆400044

mg-5li-xSn （x=0.15, 0.25 and 0.65, mass fraction） alloys were prepared. The microstructures of these alloys were investigated through optical microscope （OM）, scanning electron microscope （SEM）, X-ray diffractometer （XRD） and energy dispersive spectrometer （EDS）. The results indicate that Sn additions produce a strong grain refinement effect on mg-5li alloy. The mean grain size of as-cast mg-li alloys with Sn is reduced remarkably from 556 μm to 345 μm, and that of the as-extruded alloys is reduced from 33 μm to 23 μm when the Sn content increases from 0.15% to 0.65%. The near net-like mg2Sn phase in the as-cast alloys is verified at the grain boundaries. After extrusion, the granular mg2Sn phase mainly exists inside the grains and thus can act as nucleation sites of α-mg grains during the dynamic recrystallization and make the microstructure finer.

关键词： mg-li alloys grain refinement intermetallic compound Sn

Microstructures and Mechanical Properties of a New Biomedical Material mg-13li-X alloys

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Microstructures and Mechanical Properties of a New Biomedica...

High-cycle fatigue behavior of mg-8li-3Al-2Zn-0.5Y alloy under different states

中国材料大会2012

作者： Yanchang Zhang Sha Luo Qingqing Zhang Xiaoqing Xu Tietao Zhou School of Mat. Sci. & Eng. Beihang University School of chemical sciences Inner Mongolia Normal University

ISBN: (纸本)9783037856086;3037856084

In this paper, a new biomedical mg-li alloy for the improvement of the comprehensive mechanical properties by micro-alloying and processing to meet the need of mechanical properties of biomedical materials. And the mg-li（mg-li-Al-Zn-Ca-Sr）alloy’s processing and heat treatment were investigated in detail. The crystal texture of cast state, forged state and rolled state were observed and analyzed by OM, XRD and SEM. The mechanical properties of every stage were tested as well. The results showed that the grain size was refined obviously by the concentrating of Ca and Sr in the grain boundary. With the increase of rolling lane, the second phase’s distribution was changed to a scattered state gradually from the reunion state. The tensile strength of the forged alloy was improved as well as its elongation after cold rolling and with rolled heat treatment process. The tensile strength reached 220MPa and the elongation reach 22%, which might meet the demand of cardiovascular stents mechanics.

关键词： mg-li alloys Processing The second phase Mechanical properties

来源： cnki会议评论

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Journal of Magnesium and alloys 2021年第5期9卷 1626-1635页

作者： Xiang Peng Xinli liang Wencai liu Guohua Wu Hao Ji Xin Tong liang Zhang Wenjiang Ding National Engineering Research Center of light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China

In this study,the tensile and high-cycle fatigue properties of as-cast,solid solution treated and as-extruded mg-8li-3Al-2Zn-0.5Y alloy are *** results show that the yield strength and ultimate tensile strength of as-cast alloy is 198.1 MPa and 222.5 MPa,which are improved to 274.7 MPa and 321.7 MPa,282.4 MPa and 319.3 MPa after solid solution and extrusion treatment,*** high-cycle fatigue strength(at 10^(7)cycles,R=-1)of as-cast studied alloy is 65 MPa,which is improved to 90 MPa and 105 MPa after solid solution and extrusion treatment,*** improvement of fatigue property of the solid solution treated alloy is mainly due to the lattice distortion caused by solid solution hindering the crack ***,the improvement of fatigue property of the as-extruded alloy is mainly due to that the refined grains,stacked dislocations and dispersed secondary particles impede the crack propagation.

关键词： mg-li alloys Microstructure Tensile property S-N curve Fatigue property