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Strengthening-toughening methods and mechanisms of Mg-Li alloy:a review

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Rare Metals 2022年第4期41卷 1176-1188页

作者： Xiang Peng Wen-Cai Liu guo-hua wu 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

Magnesium-lithium(Mg-Li) alloy,as the lightest metal structure material,has unparalleled market prospects in aerospace,weapons and equipment,electronic technology,transportation,and many other ***,it is hard to balance the superlight and high strength of Mg-Li alloy,and the inferior high-temperature strength and poor high-temperature stability limit the wide application of Mg-Li *** present,the main methods to improve the mechanical properties of Mg-Li alloy are alloying,grain refinement,and compound *** domestic and overseas research progress in the strengthening and toughening methods and mechanisms of Mg-Li alloy are reviewed,and the future development of the high strength and high toughness Mg-Li alloy is prospected.

关键词： Mg-Li alloy Solution strengthening Precipitation strengthening Grain reflnement strengthening Compound strengthening

砂型铸造Mg-9Gd-3Y-0.5Zr合金的线收缩

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Transactions of Nonferrous Metals Society of China 2024年第5期34卷 1441-1455页

作者：蒋锐吴国华谢赫童鑫张亮戚方舟刘文才耿莹晶任广笑上海交通大学材料科学与工程学院轻合金精密成型国家工程研究中心金属基复合材料国家重点实验室上海200240 山西江淮重工有限责任公司晋城048000

研究铸件几何特征对砂型铸造Mg-9Gd-3Y-0.5Zr(VW93)合金线收缩的影响。利用3D扫描仪精确提取自由收缩和受阻收缩砂铸件的尺寸,并用于计算收缩系数。引入砂芯体积与铸件包络体积之比(γ)量化砂芯对铸件收缩的约束程度。通过分析自由收缩... 详细信息

研究铸件几何特征对砂型铸造Mg-9Gd-3Y-0.5Zr(VW93)合金线收缩的影响。利用3D扫描仪精确提取自由收缩和受阻收缩砂铸件的尺寸,并用于计算收缩系数。引入砂芯体积与铸件包络体积之比(γ)量化砂芯对铸件收缩的约束程度。通过分析自由收缩系数的统计分布和受阻收缩系数随γ的变化规律发现,VW93合金的自由收缩系数为1.96%,受阻收缩系数随γ的增大而线性减小,此关系为根据铸件几何结构预测VW93合金收缩率提供支持。

关键词：自由收缩受阻收缩砂型铸造 Mg-9Gd-3Y-0.5Zr合金

Zn和Gd元素含量和比例对铸态和挤压态Mg-8Li合金显微组织和力学性能的影响

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Transactions of Nonferrous Metals Society of China 2024年第3期34卷 798-811页

作者：黄玉川张泉达欧阳思杰孙福臻孙家伟李蕙宇吴国华陈培军刘文才中国机械科学研究总院集团有限公司先进成形技术与装备国家重点实验室北京100083 北京机科国创轻量化科学研究院有限公司北京100083 上海交通大学材料科学与工程学院轻合金精密成型国家工程中心和金属基复合材料重点实验室上海200240 洛阳晟雅镁合金科技有限公司洛阳471921

研究Zn和Gd元素含量及其质量比对铸态和挤压态Mg-8Li合金显微组织和力学性能的影响。挤压后,析出相破碎。β-Li中分散着粒径约100 nm的球形微粒。形成了由长条状α-Mg粗晶和再结晶β-Li细晶组成的双峰结构。挤压后合金的强度和塑性显著... 详细信息

研究Zn和Gd元素含量及其质量比对铸态和挤压态Mg-8Li合金显微组织和力学性能的影响。挤压后,析出相破碎。β-Li中分散着粒径约100 nm的球形微粒。形成了由长条状α-Mg粗晶和再结晶β-Li细晶组成的双峰结构。挤压后合金的强度和塑性显著提高,且屈服强度和极限抗拉强度随Zn和Gd含量的增加而增加。Mg-8Li-8Zn-2Gd合金表现出最优的综合性能,其屈服强度、极限抗拉强度和伸长率分别为274 MPa、283 MPa和39.9%。挤压态合金主要强化机制为由β-Li的细晶强化和α-Mg的织构强化组成的双模态结构强化和析出相的弥散强化。

关键词：镁锂合金挤压变形双峰结构弥散强化

Effect of Ti content on microstructures and mechanical properties of cast Al-2Li-2Cu-0.5Mg alloy

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China Foundry 2023年第3期20卷 179-188页

作者： You-jie guo Dong-chen Yang Liang Zhang guo-hua wu Yi-xiao Wang Pei-sen Li Guang-xiao Ren Liang-bin Li Xun-man Xiong National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China Shanxi Jianghuai Heavy Industry Co. Ltd.Jincheng 048000ShanxiChina Jiangxi Ganfeng Lithium Co. LtdXinyu 338004JiangxiChina

Ti is regarded as one of the promising grain refiners in cast Al-Li-Cu alloys,but few research works have been done on its independent *** this study,the effect of Ti on the microstructure evolution and mechanical properties of cast Al-2Li-2Cu-0.5Mg base alloy was *** results revealed that the grains can be prominently refined with the increase of Ti *** adding Ti,high density TiB_(2)-Al_(3)Ti composite particles with a low lattice misfit form as heterogeneous nucleation sites for the α-Al matrix.δ’(Al3Li) and T_(1)(Al_(2)CuLi) precipitates that provide enhanced strength are dominated in the alloys after T6 aging *** average size of both δ’ and half-width of δ’-precipitation free zone(PFZ) decreases gradually with the increase of Ti *** is because the higher binding energy between Ti atoms and vacancies limits the diffusion efficiency of Li atoms,and thus results in a higher ***,no nano-sized Al_(3)Ti or core-shell structure of Al_(3)(Li,Ti) particles are *** tensile property test results indicate that the Al-2Li-2Cu-0.5Mg alloy achieves optimal properties after aging at 175 °C for 32 h when 0.15wt.% Ti is *** exhibits a yield strength of 352±5 MPa,an ultimate tensile strength of 423±6 MPa,and an elongation of(3±0.4)%.These findings are expected to offer a reliable theoretical guidance for the industrial composition design of the Al-Li-Cu series cast alloys.

关键词： cast Al-Li-Cu alloy Ti content grain refiner mechanical property microstructure

Microstructure evolution and mechanical properties of rheo-squeeze casting AZ91-Ca alloy during heat treatment

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China Foundry 2017年第6期14卷 485-491页

作者： Yang Zhang Xiao-ping Li Shun-ping Sun Ya-lin Lu guo-hua wu School of Materials Engineering Jiangsu University of Technology Changzhou 213001 China National Engineering Research Center of Light Alloy Net Forming Shanghai Jiao Tong University Shanghai 200240 China

The rheo-squeeze casting(RSC)process is a newly-developed casting process for high-performance *** order to further improve the mechanical properties of magnesium alloys,AZ91-2wt.%Ca(AZX912)alloy was prepared by the RSC process and then subjected to heat *** microstructure evolution and mechanical properties of AZX912 alloy during heat treatment were *** was found that during solid solution treatment at 410°C,β-Mg_(17)Al_(12) phase with low melting point dissolves intoα-Mg matrix,while the connected network-like Al_2Ca phase with high melting point tends to separate gradually,and the tips of Al_2Ca phase is partially *** the increase of solid solution time,the yield strength(YS)of AZX912 alloy decreases gradually while the ultimate tensile strength(UTS)and elongation to failure(E_f)increase *** ageing at 225°C promotes the precipitation ofβ-Mg_(17)Al_(12) phase in the matrix of AZX912 *** hardness reaches the peak after ageing for 96 h and the increase in hardness is about 24.8%.The precipitation ofβ-Mg_(17)Al_(12) phase during ageing treatment is beneficial to YS but harmful to E_*** mechanism of microstructure evolution during heat treatment and its effect on mechanical properties are discussed.

关键词： magnesium alloys semisolid processing heat treatment microstructure mechanical properties

Effect of heat treatment on corrosion behavior of low pressure sand cast Mg-10Gd-3Y-0.5Zr alloys

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China Foundry 2016年第4期13卷 276-283页

作者： Qian-qian wu Guang-ling Wei guo-hua wu Wen-cai Liu Tian-peng Xuan Wen-jiang Ding National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong University School of Materials Science and Engineering Hefei University of Technology

The corrosion behaviors of low-pressure sand cast Mg-10Gd-3Y-0.5Zr(wt.%)alloys in as-cast,solution treated(T4)and aged(T6)conditions were studied by means of immersion test and electrochemical measurements in 5wt.%NaCl solution saturated with Mg(OH)_(2).It was observed that the corrosion rate in the T4 condition was lower than that of the as-cast and T6 conditions by both sand casting and permanent mold casting with the same order of as-cast>T6>T4;while the corrosion resistance of the permanent mold casting is superior to the sand *** morphologies of the corrosion products are similar porous structures consisting of tiny erect flakes perpendicular to the corroded surface of the alloy,irrespective of the heat treatment ***,the corrosion film in T4 condition is more compact than that in the other two *** addition,the severer corrosion happening to the as-cast condition is correlated with the galvanic corrosion between the matrix and the eutectic compounds;while improved corrosion resistance for the T4 and T6 conditions is ascribed to the dissolution of the secondary eutectic *** measured corrosion current densities of Mg-10Gd-3Y-0.5Zr alloys in as-cast,T4,and T6 conditions are 36μA·cm^(-2),10μA·cm^(-2),and 33μA·cm^(-2),*** proposed equivalent circuit[Rs(CPE_(1)R_(t)R_(f)CPE_(2))]by Zview software matches well with the tested electrochemical impedance spectra(EIS)data.

关键词： sand casting Mg-10Gd-3Y-0.5Zr heat treatment corrosion

Thin polymer electrolyte with MXene functional layer for uniform Li^(+) deposition in all-solid-state lithium battery

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Green Energy & Environment 2024年第1期9卷 71-80页

作者： Weijie Kou Yafang Zhang Wenjia wu Zibiao guo Quanxian hua Jingtao Wang School of Chemical Engineering Zhengzhou UniversityZhengzhou450001China

Solid polymer electrolyte(SPE) shows great potential for all-solid-state batteries because of the inherent safety and flexibility;however, the unfavourable Li+deposition and large thickness hamper its development and application. Herein, a laminar MXene functional layer-thin SPE layer-cathode integration(MXene-PEO-LFP) is designed and fabricated. The MXene functional layer formed by stacking rigid MXene nanosheets imparts higher compressive strength relative to PEO electrolyte layer. And the abundant negatively-charged groups on MXene functional layer effectively repel anions and attract cations to adjust the charge distribution behavior at electrolyte–anode interface. Furthermore,the functional layer with rich lithiophilic groups and outstanding electronic conductivity results in low Li nucleation overpotential and nucleation energy barrier. In consequence, the cell assembled with MXene-PEO-LFP, where the PEO electrolyte layer is only 12 μm, much thinner than most solid electrolytes, exhibits uniform, dendrite-free Li+deposition and excellent cycling stability. High capacity(142.8 mAh g-1), stable operation of 140 cycles(capacity decay per cycle, 0.065%), and low polarization potential(0.5 C) are obtained in this Li|MXene-PEO-LFP cell,which is superior to most PEO-based electrolytes under identical condition. This integrated design may provide a strategy for the large-scale application of thin polymer electrolytes in all-solid-state battery.

关键词： MXene nanosheet Laminar functional layer Thin polymer electrolyte Dendrite-free Liþdeposition All-solid-state lithium battery

Effect of reclaimed sand additions on mechanical properties and fracture behavior of furan no-bake resin sand

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China Foundry 2017年第2期14卷 128-137页

作者： Yan-lei Li guo-hua wu Wen-cai Liu An-tao Chen Liang Zhang Ying-xin Wang National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composites School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai Light Alloy Net Forming National Engineering Research Center Co. Ltd.

In this work, the effects of reclaimed sand additions on the microstructure characteristics, mechanical properties and fracture behavior of furan no-bake resin sand have been investigated systematically within the temperature range from 25 to 600 oC. The addition of 20%-100% reclaimed sand showed dramatic strength deterioration effect at the same temperature, which is associated with the formation of bonding bridges. Both the ultimate tensile strength(UTS) and compressive strength(CS) of the moulding sand initially increase with the increase of temperature, and then sharply decrease with the further increase of temperature, which is attributed to the thermal decomposition of furan resin. The addition amount of reclaimed sand has a remarkable effect on the room temperature fracture mode, i.e., with the addition of 0-20% reclaimed sand, the fracture mode was mainly cohesive fracture; the fracture mode converts to be mixture fracture mode as the addition of reclaimed sand increases to 35%-70%; further increasing the addition to 100% results in the fracture mode of typical adhesive fracture. The fracture surface of the bonding bridge changes from a semblance of cotton or holes to smooth with the increase of test temperature.

关键词： reclaimed sand mechanical properties thermal decomposition fracture mode

Effects of rotating gas bubble stirring treatment on the microstructures of semi-solid AZ91-2Ca alloy

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Journal of Magnesium and Alloys 2013年第3期1卷 217-223页

作者： Jia Xu guo-hua wu Wen-cai Liu Yang Zhang Wen-jiang Ding National Engineering Research Center of Light Alloy Net Forming School of Materials Science and EngineeringShanghai Jiao Tong University800 Dongchuan RoadMin HangShanghai 200240China Key State Laboratory of Metal Matrix Composite School of Materials Science and EngineeringShanghai Jiao Tong University800 Dongchuan RoadMin HangShanghai 200240China

In this study,the effect of rotating gas bubble stirring treatment on the microstructures of semi-solid AZ91-2Ca alloy was *** semi-solid slurry was produced by injecting fine gas bubbles into the melt through a rotating steel diffuser during solidification,and the samples of semi-solid slurry were taken by the rapid quenching *** results show that fine and sphericalα-Mg particles can be obtained under rotating gas bubble stirring *** process parameters such as gas flow rate,cooling rate and rotation speed have significant influence on the morphology of primary solid *** rotating gas bubble stirring treatment,the higher the particle density,the finer and rounder the primaryα-Mg *** formation of numerous solid particles is due to the combination mechanisms of copious nucleation and dendrite fragmentation.

关键词： Rotating gas bubble stirring Semi-solid slurry Processing parameters Microstructure