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| 1 | Effects of Different Stretching Routes on Microstructure and Mechanical Properties of AZ31B Magnesium Alloy Sheets显示文摘AZ31B magnesium alloy sheets were stretched by 13% along three different routes: the extrusion direction(Route A), 45° to the extrusion direction(Route B) and the transverse direction(Route C), and then were annealed at 350 °C for 60 min. The microstructure and texture, tensile mechanical properties and formability were investigated at room temperature. The results indicated that all the three stretched samples exhibited weakened basal texture, compared with the as-received sheet due to static recrystallization.By comparison, Route B processed sample showed the most dispersive basal texture, while Route A processed specimen exhibited the lowest basal intensity. Improved mechanical properties for the stretched and annealed sheets with different stretching routes were achieved. Furthermore, Route A processed sheet showed the highest Erichsen value compared with the samples processed along Route B and Route C. | Jingren Dong Dingfei Zhang Jing Sun Qingwei Dai Fusheng Pan | 2015 | Journal of Materials Science & Technology2015，31，9： | 3 |
| 2 | Effect of the width on AZ31 sheet rolling显示文摘A pyramid sheet has been used in experiments and three-dimensional finite element simulation to study the edge cracks and effects of width on AZ31 sheet under rolling.Results show that the edge cracks of Mg sheet comply with the Normalized Crockroft & Latham theory.It can be predicted by D=-0.124+0.09X -0.008X2,if D ≥ 0,the edge cracks occur.The sheet shearing deformation at the edge brings about cracks.The strain rate changes periodically with different X.With initial width increases,the recrystallized grain size decreases.The finite element model has been validated by the experiment results. | Qingwei DAI Dingfei ZHANG Wei LAN Lin FANG Junping ZHANG | 2010 | Acta Metallurgica Sinica(English Letters)2010，23，2： | 2 |
| 3 | Transformation of Laves phases and its effect on the mechanical properties of TIG welded Mg-Al-Ca-Mn alloys显示文摘The effects of Al content and Ca/Al mass ratio on the microstructure and mechanical properties of tungsten inert gas(TIG)welded Mg-2Ca-x Al-0.5Mn(x=0,1,5)alloy joints were studied in present work.Results showed that increasing Al content was effective in reducing the dendrite spacing at the fusion zone(FZ)edge.The Laves phases in the FZ and the heat-affected zone(HAZ)can be changed from Mg_(2)Ca to(Mg,Al)_(2)Ca with the decrease of Ca/Al ratio,and the(Mg,Al)_(2)Ca could be further transformed to Al_(2)Ca under welding thermal cycle.Furthermore,dynamic dissolution and precipitation of Laves phases and Al_(8)Mn_(5)phases occurred in the HAZ,resulting in a gradient microstructure and hardness peak in this area.The tensile properties of the joints were significantly improved with the increase of Al content,which was mainly due to the modification of Laves phases. | Sensen Chai Shiyu Zhong Qingshan Yang Daliang Yu Qingwei Dai Hehe Zhang Limeng Yin Gang Wang Zongxiang Yao | 2022 | Journal of Materials Science & Technology2022，，25： | 2 |
| 4 | Twinning, grain orientation, and texture variations in Mg alloy processed by pre-rolling显示文摘A pre-rolling(PR) process with a small pre-strain was applied along the transverse direction(TD) and the extrusion direction(ED) of non-basal and basal textured AZ61 Mg alloys at room temperature to investigate the induced twinning behavior. The microstructural evolution of the alloys was used to evaluate the grain-boundary effect in terms of the texture variation. The results demonstrated that■ extension twinning was introduced by the PR process and that the volume fraction of twins increased with increasing thickness reduction. The subdivision of grains via twinning induced grain reorientation that generated a prominent basal texture with the c-axis parallel to the normal direction(ND) after PR. The textured Mg alloy with this c-axis//TD feature can promote twinning activity. The twinning performance was critical to initiate plastic deformation, therefore to determine deformation behavior at room temperature. The deformation mechanism was also addressed related to the extension twin lamellae. | Qingshan Yang Qingwei Dai Chao Lou Jiahong Dai Jianyue Zhang Bin Jiang Fusheng Pan | 2019 | Progress in Natural Science:Materials International2019，29，2： | 2 |
| 5 | On the anisotropic deformation of AZ31 Mg alloy under compression显示文摘 | Qingwei Dai Dingfei Zhang Xi Chen | 2011 | Materials and Design2011，，10： | 1 |
| 6 | On the anisotropic deformation of AZ31 Mg alloy under compression显示文摘 | Qingwei Dai Dingfei Zhang Xi Chen | 2011 | Materials and Design2011，，10： | 1 |
| 7 | Microstructures and mechanical properties of high strength Mg-Zn-Mn alloy 显示文摘 | Zhang Dingfei Shi Guoliang Dai Qingwei | 2008 | Transactions of Nonferrous Metals Society of China2008，1，： | 1 |
| 8 | The mechanisms of grain growth of Mg alloys:A review显示文摘Grain growth directly influences the plasticity and strength of Mg alloys.As the grain size decreases from the microscale to the nanoscale,the plasticity of Mg alloys continually increases,whereas the strength first increases and later decreases.These trends are observed because the plastic deformation mechanism changes from dislocation–twinning dominance to grain boundary dominance.In this study,the factors influencing grain growth,such as the temperature of plastic deformation/annealing,second-phase particles and solute atoms,are examined to aid effective control of the grain size.Additionally,the mechanisms of grain growth,typically induced by strain and thermal activation,are clarified.Strain-induced grain boundary migration is attributable to the difference in the strain energy stored in adjacent grains with high-density dislocations.Heat-induced grain boundary migration is driven by the difference in the energy of the grain boundary/subgrain boundary and boundary curvature.Abnormal grain growth can be induced by anisotropy of the strain energy,anisotropy of the grain boundary mobility,depinning of the second phase and high misorientation gradient. | Qinghua Chen Ruinan Chen Jian Su Qingsong He Bin Tan Chao Xu Xu Huang Qingwei Dai Jian Lu | 2022 | Journal of Magnesium and Alloys2022，10，9： | 1 |
| 9 | Solid-state bonding process induced highly synergistic mechanical properties of 6061 Al alloy joint by shear deformation显示文摘Obtaining a highly synergistic mechanical property between joint and base metal(BM)in aluminum(Al)alloy is a chronic problem.In this work,shear bonding technology is applied to a commercial 6061 Al alloy.The results show that a flat and uniform joint interface is obtained.The joint presents a highly synergistic mechanical property compared with BM,whether after shear bonding or heat treatment.The joint coefficient reaches 95.6%after shear bonding and exceeds 100%after heat treatment,which is better than the traditional connection method of aluminum alloy.The high joint coefficient mainly originates from the well-linked joint and gradient grain structure.The gradient grain structure is beneficial to activate more slip systems to coordinate plastic deformation.Although the fine-grained structure is sacrificed after heat treatment,higher strength and joint coefficient are obtained due to the higher work hardening.This newly developed method has a large potential for application to the infinite rolling of Al alloy sheets and can also be used for Al alloy connection in automobile,aerospace,rail transportation,and other fields.The findings in this work can provide essential theoretical support and application reference for the shear connection of Al alloy. | Peng Peng Jian Su Qingsong He Ruinan Chen Sensen Chai Daliang Yu Qingwei Dai Jian Lu | 2023 | Journal of Materials Science & Technology2023，，33： | 0 |
| 10 | A novel member of lymphocyte-specific protein tyrosine kinase protein identified in lamprey, Lampetrajaponica显示文摘 | Yinglun Han | 2014 | Acta Biochimica et Biophysica Sinica2014，46，9： | 0 |
| 11 | A Spiral Graphene Framework Containing Highly Ordered Graphene Microtubes for Polymer Composites with Superior Through-Plane Thermal Conductivity显示文摘As the power density of electronic devices increases,there has been an urgent demand to develop highly conductive polymer composites to address the accompanying thermal management issues.Due to the ultra-high intrinsic thermal conductivity,graphene is considered a very promising filler to improve the thermal conductivity of polymers.However,graphene-based polymer composites prepared by the conventional mixing method generally have limited thermal conductivity,even under high graphene loading,due to the failure to construct efficient heat transfer pathways in the polymer matrix.Here,a spiral graphene framework(SGF)containing continuous and highly ordered graphene microtubes was developed based on a modified CVD method.After embedding into the epoxy(EP)matrix,the graphene microtubes can act as efficient heat pathways,endowing the SGF/EP composites with a high through-plane thermal conductivity of 1.35 W·m^(-1)·K^(-1) at an ultralow graphene loading of 0.86 wt%.This result gives a thermal conductivity enhancement per 1 wt%filler loading of 710%,significantly outperforming various graphene structures as fillers.In addition,we demonstrated the practical application of the SGF/EP composite as a thermal interface material for efficient thermal man-agement of the light-emitting diode(LED). | Jinrui Gong Xue Tan Qilong Yuan Zhiduo Liu Junfeng Ying Le Lv Qingwei Yan Wubo Chu Chen Xue Jinhong Yu Kazuhito Nishimura Nan Jiang Cheng-Te Lin Wen Dai | 2022 | Chinese Journal of Chemistry2022，40，3： | 0 |
| 12 | An Investigation into Disease Progression and the Correlation between Diabetes Mellitus and Hepatocellular Carcinoma显示文摘Diabetes mellitus has been associated with anincreased risk of hepatocellular carcinoma in recent studies ofpatients. At the same time, advanced hepatocellular carcinomaitself can cause glucose intolerance and can aggravate diabetes.Diabetes mellitus inducing hepatocellular carcinoma may resultin changes in the following aspects: dysfunction of organism,endocrine hormone balance and interactions, endothelins andso on. One way, diabetes mellitus may induce hepatocellularcarcinoma through the effects of chemotherapeutics and otheradjuvant drugs. This review outlines the relationship betweendiabetes mellitus and the risk of hepatocellular carcinoma as wellas treatments for hepatocellular carcinoma, which may be helpfulfor clinicians. | Qingwei Yang Ying Hou Yanqing Liu Xiaojun Dai | 2009 | Clinical oncology and cancer resexreh2009，6，6： | 0 |
| 13 | Rational design of graphene structures for preparing high-performance thermal interface materials: A mini review显示文摘With the explosive development in integration of electronic components and the increasing complexity of packaging systems,semiconductor chips own extremely high operation temperatures given by the horrible heat accumulation attributed to the drastically increasing power density. Therefore, highly efficient heat dissipation with the help of rationally designed thermal interface materials(TIMs) is the key to maintaining the device performance and lifespan. Graphene exhibits an ultrahigh intrinsic thermal conductivity, which has attracted a large amount of academic interest due to its significant potential for developing high-performance TIMs. In this tutorial review, we summarize the recent advances in graphene-based TIMs, especially emphasizing the determinate effects of graphene structure and alignment in enhancing the heat transfer capacity of corresponding samples,with detailed discussion in the superiorities and limitations of various graphene skeletons. In addition, we also provide prospects for the challenges and opportunities in the future development of graphene-based TIMs. | Junfeng Ying Wen Dai Jinhong Yu Nan Jiang Cheng-Te Lin Qingwei Yan | 2022 | Science China(Physics,Mechanics & Astronomy)2022，65，11： | 0 |
| 14 | Ultralow Interfacial Thermal Resistance of Graphene Thermal Interface Materials with Surface Metal Liquefaction显示文摘Developing advanced thermal interface materials(TIMs)to bridge heat-generating chip and heat sink for constructing an efficient heat transfer interface is the key technology to solve the thermal management issue of high-power semiconductor devices.Based on the ultra-high basal-plane thermal conductivity,graphene is an ideal candidate for preparing high-performance TIMs,preferably to form a vertically aligned structure so that the basal-plane of graphene is consistent with the heat transfer direction of TIM.However,the actual interfacial heat transfer efficiency of currently reported vertically aligned graphene TIMs is far from satisfactory.In addition to the fact that the thermal conductivity of the vertically aligned TIMs can be further improved,another critical factor is the limited actual contact area leading to relatively high contact thermal resistance(20-30 K mm^(2) W^(−1))of the“solid-solid”mating interface formed by the vertical graphene and the rough chip/heat sink.To solve this common problem faced by vertically aligned graphene,in this work,we combined mechanical orientation and surface modification strategy to construct a three-tiered TIM composed of mainly vertically aligned graphene in the middle and micrometer-thick liquid metal as a cap layer on upper and lower surfaces.Based on rational graphene orientation regulation in the middle tier,the resultant graphene-based TIM exhibited an ultra-high thermal conductivity of 176 W m^(−1) K^(−1).Additionally,we demonstrated that the liquid metal cap layer in contact with the chip/heat sink forms a“liquid-solid”mating interface,significantly increasing the effective heat transfer area and giving a low contact thermal con-ductivity of 4-6 K mm^(2) W^(−1) under packaging conditions.This finding provides valuable guidance for the design of high-performance TIMs based on two-dimensional materials and improves the possibility of their practical application in electronic thermal management. | Wen Dai Xing-Jie Ren Qingwei Yan Shengding Wang Mingyang Yang Le Lv Junfeng Ying Lu Chen Peidi Tao Liwen Sun Chen Xue Jinhong Yu Chengyi Song Kazuhito Nishimura Nan Jiang Cheng-Te Lin | 2023 | Nano-Micro Letters2023，15，1： | 0 |
| 15 | Microstructure design of advanced magnesium-air battery anodes显示文摘Metal-air battery is an environmental friendly energy storage system with unique open structure.Magnesium(Mg)and its alloys have been extensively attempted as anodes for air batteries due to high theoretical energy density,low cost,and recyclability.However,the study on Mg-air battery(MAB)is still at the laboratory level currently,mainly owing to the low anodic efficiency caused by the poor corrosion resistance.In order to reduce corrosion losses and achieve optimal utilization efficiency of Mg anode,the design strategies are reviewed from microstructure perspectives.Firstly,the corrosion behaviors have been discussed,especially the negative difference effect derived by hydrogen evolution.Special attention is given to the effect of anode micro-structures on the MAB,which includes grain size,grain orientation,second phases,crystal structure,twins,and dislocations.For further improvement,the discharge performance,long period stacking ordered phase and its enhancing effect are considered.Meanwhile,given the current debates over Mg dendrites,the potential risk,the impact on discharge,and the elimination strategies are discussed.Microstructure control and single crystal would be promising ways for MAB anode. | Xu Huang Qingwei Dai Qing Xiang Na Yang Gaopeng Zhang Ao Shen Wanming Li | 2024 | Journal of Magnesium and Alloys2024，12，2： | 0 |
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