检索结果-南通市图书馆

Energy & Environmental Materials 2024年第2期7卷 204-212页

作者： Jiale Ke Xing Zhao Jie yang Kai Ke Yu Wang mingbo yang Wei yang College of Polymer Science and Engineering Sichuan University State Key Laboratory of Polymer Materials Engineering

Thermoelectric（TE） generators capable of converting thermal energy into applicable electricity have gained great popularity among emerging energy conversion ***-based ionic thermoelectric（i-TE）materials are promising candidates for energy conversion systems because of their wide sources,innocuity,and low manufacturing ***,common physically crosslinked biopolymer gels induced by single hydrogen bonding or hydrophobic interaction suffer from low differential thermal voltage and poor thermodynamic ***,we develop a novel i-TE gel with supramolecular structures through multiple noncovalent interactions between ionic liquids（ILs） and gelatin molecular *** thermopower and thermoelectric power factor of the ionic gels are as high as 2.83 mV K-1and 18.33 μW m-1K-2,*** quasi-solid-state gelatin-[EMIM]DCA i-TE cells achieve ultrahigh 2 h output energy density(E2h=9.9 mJ m-2) under an optimal temperature ***,the remarkable stability of the supramolecular structure provides the i-TE hydrogels with a thermal stability of up to 80 ℃.It breaks the limitation that biopolymer-based i-TE gels can only be applied in the low temperature range and enables biopolymer-based i-TE materials to pursue better performance in a higher temperature range.

关键词： biopolymer gel ionic liquid multiple noncovalent interactions supramolecular structure thermoelectric conversion

Interfacial Reaction of Ti6Al4V Lattice Structure-Reinforced VW92 Alloy Matrix Composites

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2024年第3期37卷 570-576页

作者： Haijun Wang Renju Cheng Xianhua Chen mingbo yang Daiyi Deng Lirui Liu Yongfeng Zhou Yanlong Ma Kaihong Zheng Fusheng Pan College of Materials Science and Engineering Chongqing University of TechnologyChongqing 400054China College of Materials Science and Engineering Chongqing UniversityChongqing 400044China Institute of New Materials Guangdong Academy of SciencesGuangzhou 510650China

A novel melting infiltration by ultrasonic vibration was investigated and applied to fabricate Ti6Al4V(TC4)lattice structure-reinforced Mg-10Gd-2Y-1Zn-xZr(refer to VW92 hereafter,x=0,0.5 wt%)alloy matrix *** edge-to-edge matching model indicates that the well-matching and possible orientation relationships(ORs)between theα-Mg andα-Ti,[10-10]_(α-Mg)//[11-23]_(α-Ti) in(0002)_(α-Mg)//(10-10)_(α-Ti) possesses the smallest misfit of 0.4%(f_(r)),and thus theα-Mg grains can nucleate on the TC4 lattice *** reaction occurred in the TC4/VW92+0.5 wt%Zr composites,and the reaction product was confirmed to be Al_(2)Zr_(3),AlZr_(2) andα-Ti(Zr)particles formed by continuous solution of *** the interfacial products,the AlZr_(2) phase is a brittle phase with high-volume fraction,which is not conducive to the load *** generally speaking,theα-Ti(Zr)and theα-Mg tend to form a coherent interface,which is beneficial for improving the interfacial bonding strength of composites.

关键词： TC4 VW92 composites TC4 lattice structure Interfacial reaction Mismatch

Correction to:Dependence of Microstructure Evolution and Mechanical Properties on Loading Direction for AZ31 Magnesium Alloy Sheet with Non‑basal Texture During In‑Plane Uniaxial Tension

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2024年第2期37卷 388-388页

作者： Li Hu Mingao Li Qiang Chen Tao Zhou Laixin Shi mingbo yang College of Material Science and Engineering Chongqing University of TechnologyChongqing400054China Southwest Technology and Engineering Research Institute Chongqing400039China

In the originally published PDF version of the article,a reference citation[34]has been omitted in the caption of *** added reference No.34 is“***,***,***,***,***,***,***,***,***.10,1994(2022)https://***/10.1016/***.... 详细信息

关键词： Microstructure Alloy AZ31

Effect of Semi-Solid Isothermal Heat Treatment on Microstructure of ZL104 Aluminum Alloy

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

稀有金属材料与工程 2009年第A3期38卷 95-99页

作者： yang mingbo Shen Jia Materials Science ＆ Engineering College Chongqing Institute of Technology Chongqing 400050 China

The feasibility of fabricating ZL104 aluminum alloy with non-dendritic microstructure by semi-solid isothermal heat treatment process and the effects of holding temperature and time on the semi-solid isothermal heat-treated microstructure of the alloy, are investigated. The research results indicate that it is possible to produce ZL104 alloy with non-dendritic microstructure by a suitable semi-solid isothermal heat treatment. After treated at 580 ℃ for 120 min, the ZL104 alloy can obtain a non-dendritic microstructure with an 49% liquid content and an average size range of 115 μm of the unmelted primary solid particles. In addition, an increase in the holding time from 30 to 120 min for a given holding temperature of 580 ℃ or in the holding temperature from 570 to 580 ℃ for a given holding time of 120 min causes the average size and globular tendency of unmelted primary solid particles in the semi-solid ZL104 alloy to decrease and become more obvious, respectively.

关键词：铝合金热处理过程微观结构物理性能

A Review on Casting Magnesium Alloys： Modification of Commercial Alloys and Development of New Alloys

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2016年第12期32卷 1211-1221页

作者： Fusheng Pan mingbo yang Xianhua Chen National Engineering Research Center for Magnesium Alloys (CCMg) Chongqing University Chongqing 400044 China Chongqing Academy of Science and Technology (CAST) Chongqing 401123 China College of Material Science and Engineering Chongqing University of Technology Chongqing 400050 China

The research and development status of casting magnesium alloys including the commercial casting alloys and the new types casting alloys are reviewed,with more attention to microstructure and mechanical properties of modified-AZ91,AM60 and WE43 alloys with various additions,and new types of low cost casting alloys and high strength casting *** modification and/or refinement of Mg2 Si phase in Mg-Al-Si based casting alloys by various additions are discussed and new purifying technologies for casting magnesium alloys are introduced to improve the *** modified AZ81 alloy with reduced impurities is found to have the tensile strength of 280 ± 6 MPa and elongation of 16% ± 0.7%.The fatigue strength of AZ91 D alloy could be obviously improved by addition of Ce and *** Mg-16Gd-2Ag-0.3Zr alloy exhibits very high tensile and yield strengths（UTS：423 MPa and YS：328 MPa）;however,its elongation still needs to be improved.

关键词： Casting magnesium alloys Microstructure Mechanical properties Corrosion Purification Alloying elements

Modification and refinement mechanism of Mg_2Si phase in Sr-containing AZ61-0.7Si magnesium alloy

在线全文

学校读者我要写书评

暂无评论

China Foundry 2009年第1期6卷 37-42页

作者： yang mingbo Shen Jia Materials Science and Engineering College Chongqing Institute of Technology Chongqing 400050 China Materials Science and Engineering College Chongqing University Chongqing 400030 China

The effect of Sr on modification and refinement of the Mg 2 Si phase in an AZ61-0.7Si magnesium alloy has been investigated and *** results indicate that Sr can effectively modify and refine the Chinese-script shaped Mg2Si phase in the AZ61-0.7Si *** adding 0.06wt.%-0.12wt.%Sr to AZ61-0.7Si alloy,the Mg2Si phase in the alloy can be changed from the initial coarse Chinese-script shape to fine granule and/or irregular polygonal ***,the Sr-containing AZ61-0.7Si alloy exhibits higher tensile and creep properties than the AZ61-0.7Si alloy without Sr *** mechanism on modification and refinement of the Mg2Si phase in Sr-containing AZ61-0.7Si alloy is possibly related to the following two aspects:(1)adding Sr may form the Al4Sr phase which can serve as the heterogeneous nucleus for the Mg2Si particles and/or(2)adding Sr may lower the onset crystallizing temperature and increase the undercooling level.

关键词： AZ61-0.7Si magnesium alloy Sr Mg2Si phase modification and refinement

在线全文

学校读者我要写书评

暂无评论

基于大概念的学科单元整体教学设计与实施

中国基础教育 2024年第3期 60-64页

作者：杨明波娄龙雁江苏省南京市北京东路小学江苏南京210008 江苏省南京市玄武区教师发展中心江苏南京210016

基于大概念开展单元整体教学,是促进学生学习从碎片化走向结构化、形成系统思维、发展核心素养的有效途径。教师在教学中,可设置单元起始课,通过学生的自主梳理,提炼单元大概念;在解构单元大概念过程中,明晰单元整体教学目标与课时教学... 详细信息

基于大概念开展单元整体教学,是促进学生学习从碎片化走向结构化、形成系统思维、发展核心素养的有效途径。教师在教学中,可设置单元起始课,通过学生的自主梳理,提炼单元大概念;在解构单元大概念过程中,明晰单元整体教学目标与课时教学目标,引领一致性、进阶式单元整体教学设计;聚焦“大情境”“大问题”“大任务”,营造联结思维的情境场,生成循序渐进的问题链,设计自主探究的任务群,促成以大概念为核心的单元整体教学真正落地。

关键词：大概念核心概念单元整体教学任务群道德与法治

Analysis of the cracks formation on surface of extruded magnesium rod based on numerical modeling and experimental verification

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2009年第5期22卷 353-364页

作者： Hongjun HU Dingfei ZHANG Fusheng PAN mingbo yang College of Materials Science and Engineering Chongqing University Chongqing 400045 China National Engineering Research Center for Magnesium Alloys Chongqing 400044 China College of Material Science and Engineering Chongqing University of Technology Chongqing 400050 China

To reduce the surface cracks of extrusion rod for AZ31 magnesium caused by nonhomogeneous metal flow in extrusion process, 3D computer finite element （FE） simulations of extruding a wrought magnesium alloy AZ31 into rods have been performed and the results have been verified in extrusion experiments under identical conditions. The tendency to generate the dead zone is decreased by employing the die angle 60° at the cone-shaped die comparing with the die angle 180°. The surface additional tensile stresses of the rod at the die exit are decreased greatly so that the surface cracks caused are avoided by using the die angle 60°. The extrusion die with die angle 180° would increase the higher temperature rise and possibility of crack formation on the rod surface that caused by die angle 60° and temperature rise decrease tensile strength of the AZ31 rod. The experimental results show that die angle 180° could cause continuous cracks on the surface of the extruded rod. The extrusion force required is reduced approximately 15 ton by employing the die angle 60°. Theoretical results obtained by the DeformTM-3D simulation agreed well with the experiments. The obtained results provide the fundamental and also practical guidelines for the design and correction of dies to produce magnesium rod with good surface quality.

关键词： Extrusion Finite element Magnesium alloy Cracks Experimental validation

Effects of heat treatment on the microstructure and mechanical properties of ZA84 magnesium alloy

在线全文

学校读者我要写书评

暂无评论

Journal of University of Science and Technology Beijing 2008年第6期15卷 747-752页

作者： mingbo yang Liang Bai Fusheng Pan Hongjun Hu School of Materials Science and Engineering Chongqing Institute of Technology Chongqing 400050 China School of Materials Science and Engineering Chongqing University Chongqing 400030 China

The effects of heat treatment on the microstructure and mechanical properties of ZA84 （Mg-8Zn-4Al-0.25Mn） alloy were investigated. The results indicate that the as-cast microstructure of the alloy is mainly composed of α-Mg matrix and two different morphologies of precipitates （continuous and quasi-continuous Mg32（Al,Zn）49 phases and isolated Mg5Al2Zn2 phases）. After solid solution treatment at 345℃, the Mg32（Al,Zn）49 phases change from continuous and quasi-continuous net to disconnected acute angle shape, and parts of second phases sphericize. The optimum heat treatment condition for the alloy is solution treatment at 345℃ for 48 h and water quenching, then aging treatment at 200℃ for 12 h and atmosphere cooling. Under the optimum condition, the ulti- mate tensile strength and yield strength of the alloy can be imoroved, but the elongation is not effected much bv heat treatment.

关键词： ZA84 magnesium alloy heat treatment microstructure mechanical properties precipitates

Effects of minor Sr addition on as-cast microstructure and mechanical properties of a Mg-3Sn-2Ca(wt.%) magnesium alloy

在线全文

学校读者我要写书评

暂无评论

China Foundry 2014年第2期11卷 108-114页

作者： yang mingbo Li Hongliang Duan Chengyu School of Materials Science & Engineering Chongqing University of Technology Key Laboratory of Manufacture and Test Techniques for Automobile Parts Ministry of EducationChongqing University of Technology

Minor Sr was introduced to the Mg-3Sn-2Ca （wt.%） alloy in this paper, and the effects of minor Sr addition on the as-cast microstructure and mechanical properties of the Mg-3Sn-2Ca （wt.%） alloy were investigated by using of optical and electron microscopies, differential scanning calorimetry （DSC） analysis, and tensile and creep tests. The results indicate that, after adding 0.034wt.%, 0.065wt.% or 0.10wt.% Sr to the Mg- 3Sn-2Ca alloy, the morphology of the primary CaMgSn phase changes from the initial coarse needle-like net to relatively fine short block and/or particle-like shapes. At the same time, the additions of 0.034wt.% or 0.065wt.% Sr suppress the formation of the primary CaMgSn phase, and the addition of 0.10wt.% Sr not only suppresses the formation of the primary and eutectic CaMgSn phases but also promotes the formation of Mg2Ca phase. Furthermore, the addition of minor Sr to the Mg-3Sn-2Ca alloy can improve the tensile properties of the alloy both at room temperature and 150 ℃. The creep property of the Mg-3Sn-2Ca alloy at 150 ~C is also improved by the additions of 0.034wt.% and 0.065wt.% Sr; however, the addition of 0.10wt.% Sr is not beneficial to the creep properties of the Mg-3Sn-2Ca alloy.

关键词： magnesium alloys Mg-Sn-Ca alloys CaMgSn phase Sr addition