检索结果-南通市图书馆

砂型铸造Mg-9Gd-3Y-0.5Zr合金的线收缩

在线全文

学校读者我要写书评

暂无评论

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

Effects of Li content on microstructure and mechanical properties of as-cast Mg-xLi-3Al-2Zn-0.5Y alloys

在线全文

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2022年第3期32卷 838-849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

The effects of Li content on the microstructure and mechanical properties of the as-cast Mg−xLi−3Al−2Zn−0.5Y(LAZx32-0.5Y)alloys were investigated by XRD,SEM,TEM,hardness tester and universal testing *** results show that the matrix of the alloy transforms fromα-Mg toα-Mg+β-Li and then toβ-Li when the Li content increases from 4%to 14%(mass fraction).All LAZx32-0.5Y alloys contain AlLi and Al_(2)Y,while MgLi_(2)Al appears only in the alloy containing theβ-Li *** the Li content increases,the content of AlLi and MgLi_(2)Al gradually increases,while the content of Al_(2)Y does not change *** the Li content increases from 4%to 10%,the ultimate tensile strength and hardness of the as-cast LAZx32-0.5Y alloys gradually decrease while the elongation gradually *** corresponding fracture mechanism changes from cleavage fracture to quasi-cleavage fracture and then to microporous aggregation *** is mainly attributed to the decrease ofα-Mg and the increase ofβ-Li in the *** the Li content continues to increase to 10%and 14%,the yield strength,ultimate tensile strength and hardness of the as-cast LAZx32-0.5Y alloys gradually increase,while the elongation decreases sharply,which is mainly attributed to the nano-scale MgLi_(2)Al uniformly distributed in theβ-Li matrix.

关键词： Mg-Li alloy li content alloying microstructure mechanical properties

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

在线全文

学校读者我要写书评

暂无评论

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

在线全文

学校读者我要写书评

暂无评论

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 and corrosion behavior of as-homogenized and as-extruded Mg-xLi-3Al-2Zn-0.5Y alloys(x=4,8,12)

在线全文

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2022年第1期32卷 134-146页

作者： Xiang PENG Jia-wei SUN Hong-jie LIU guo-hua wu Wen-cai LIU 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

The microstructure and corrosion behavior of the as-homogenized and as-extruded Mg-xLi-3Al-2Zn-0.5Y alloys(x=4,8,12,wt.%)were *** results show that as the Li content increases from 4%to 12%,the matrix transfers from singleα-Mg phase,(α-Mg+β-Li)dual phase to singleβ-Li phase.A mixed corrosion feature of intergranular corrosion and pitting corrosion occurs in the Mg-4Li-3Al-2Zn-0.5Y and Mg-12Li-3Al-2Zn-0.5Y *** former is related to the precipitated AlLi phase along the grain boundaries,and the latter is related to the high potential difference between the second phase and the *** corrosion resistance of the as-extruded alloys is better than that of the as-homogenized *** superior corrosion resistance of the as-extruded Mg-8Li-3Al-2Zn-0.5Y alloy with the lowest corrosion rate(P_(W)=(0.63±0.26)mm/a)is attributed to the more uniform distribution of second phases,the protectiveα-Mg phase via sacrificing theβ-Li phase and the relatively integrated oxide film.

关键词： Mg-xLi-3Al-2Zn-0.5Y alloys microstructure corrosion behavior homogenization extrusion second phase oxide film

Effect of heat treatments on microstructure and mechanical properties of sand cast Al−2Li−2Cu−0.5Mg−0.2Sc−0.2Zr alloy

在线全文

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2022年第2期32卷 411-423页

作者： Jin-shuo ZHANG Xiao-xiang ZHONG Liang ZHANG guo-hua wu Wen-cai LIU 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

This study focused on modifying heat treatment schemes to enhance the mechanical properties of sand cast Al−2Li−2Cu−0.5Mg−0.2Sc−0.2Zr *** three-stage solution treatment schemes((460℃,32 h)+(520℃,24 h)+(530/540/550℃,4/12/24/32 h))and aging temperatures(125,175,225℃)were designed for *** microstructure evolutions were analyzed by optical microscopy(OM),scanning electron microscopy(SEM)and transmission electron microscopy(TEM).The results showed that the three-stage solution treatment of(460℃,32 h)+(520℃,24 h)+(530℃,12 h)could dissolve most of the secondary *** TEM results illustrated that fineδ'(Al_(3)Li)particles were homogeneously distributed in the matrix after aging at 175℃for 8 h,accompanied by a small amount of lath-shaped S′(Al_(2)CuMg)and plate-like T_(1)(Al_(2)CuLi)*** best comprehensive properties of yield strength of 376 MPa,ultimate tensile strength of 458 MPa and elongation of 4.1%were obtained by the optimal heat treatment scheme((460℃,32 h)+(520℃,24 h)+(530℃,12 h)+(175℃,8 h)).

关键词： Al−Li−Cu alloys sand-casting heat treatment precipitation microstructure mechanical properties

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

在线全文

学校读者我要写书评

暂无评论

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

Microstructural evolution and mechanical performance of cast Mg−3Nd−0.2Zn−0.5Zr alloy with Y additions

在线全文

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2022年第10期32卷 3222-3237页

作者： He XIE guo-hua wu Xiao-long ZHANG Zhong-quan LI Wen-cai LIU Liang ZHANG Bao-de SUN 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 Shanghai Spaceflight Precision Machinery Institute Shanghai 201600China

This work investigated the effects of different Y additions(0,1.5,3.0 and 4.5 wt.%)on the microstructural evolution and mechanical performance of cast Mg−3Nd−0.2Zn−0.5Zr *** results show that as the Y content increases,the key secondary phases in as-cast alloys change from the Mg_(12)Nd type to the Mg_(24)Y_(5) ***,the number density of Zn−Zr particles in the grains of as-quenched alloys gradually ***-STEM observations of peak-aged samples reveal that element Y is greatly enriched in the globularβ¢precipitates,leading to a significantly increased volume fraction and promoted precipitation kinetics ofβ¢precipitates,resulting in enhanced strength of the *** tests reveal that,with the addition of 4.5 wt.%Y,the yield strength of the base alloy is substantially increased by 88 and 61 MPa after being aged at 200 and 225°C under peak-aged conditions,respectively.

关键词： Mg−3Nd−0.2Zn−0.5Zr alloy Y alloying age-hardening response microstructural evolution mechanical properties

Electrochemical anodic oxidation assisted fabrication of memristors

在线全文

学校读者我要写书评

暂无评论

International Journal of Extreme Manufacturing 2024年第3期6卷 250-272页

作者： Shuai-Bin hua Tian Jin Xin guo School of Materials Science and Engineering State Key Laboratory of Material Processing and Die&Mould TechnologyHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China

Owing to the advantages of simple structure,low power consumption and high-density integration,memristors or memristive devices are attracting increasing attention in the fields such as next generation non-volatile memories,neuromorphic computation and data ***,the deposition of memristive films often requires expensive equipment,strict vacuum conditions,high energy consumption,and extended processing *** contrast,electrochemical anodizing can produce metal oxide films quickly(e.g.10 s) under ambient *** means of the anodizing technique,oxide films,oxide nanotubes,nanowires and nanodots can be fabricated to prepare *** film thickness,nanostructures,defect concentrations,etc,can be varied to regulate device performances by adjusting oxidation parameters such as voltage,current and *** memristors fabricated by the anodic oxidation technique can achieve high device consistency,low variation,and ultrahigh yield *** article provides a comprehensive review of the research progress in the field of anodic oxidation assisted fabrication of ***,the principle of anodic oxidation is introduced;then,different types of memristors produced by anodic oxidation and their applications are presented;finally,features and challenges of anodic oxidation for memristor production are elaborated.

关键词： anodic oxidation anodized aluminium oxide memristor resistive switching electrical properties