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Recrystallization of Ni_3 Al Base Single Crystal Alloy IC6SX with Different Surface mechanical Processes

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Journal of materials Science & Technology 2010年第10期26卷 883-888页

作者： Yanan Li School of materials Scienceg and-Engineering Beijing University of Aeronautics and Astronautics Beijing 100083 China Beijing Institute of Aeronautical materials Beijing 100095 China Fine metals Branch Advanced Technology &: Materials Co. Ltd. (AT&M) Beijing 100081 China

The recrystallization behavior of Ni 3 Al base single crystal alloy IC6SX with different mechanical processes has been *** specimens of the alloy were treated by surface cleaning and cold working during the blades manufacture,and then heat treated in the temperature range of 800-1260℃ for 1 h to 4 *** microstrcture of the specimens were examined by optical and scaning electron microscopy,and the room temperature tensile property,stress rupture property under the test condition of 1100℃/130 mPa,and the thermal cycle fatigue resistance under 1100-20℃ of the specimens with and without recrystallization were carried *** experimental results showed that the initial recrystallization nucleation temperatures of the alloy by dry grit blasting,wet grit blasting,indentation,shot blasting and burnishing were 900-950℃/1 h,1000-1100℃/1 h,1200-1220℃/4 h,1220-1240℃/1 h and 1220-1240 C/1 h,respectively and the primal recrystallization completing temperatures of the alloy by those mechanical processes mentioned above were 1200-1210℃/1 h,1100-1200℃/1 h,1220-1240℃/4 h,1240-1260℃/1 h and 1240-1260℃/1 h,*** results also indicated that the deformation amount of the specimens by burnishing and dry grit blasting was bigger than that by wet grit blasting and shot blasting according to their recrystallization temperature and the microhardness profile below the surface of *** has been found that the recrystallization had no evident effect on mechanical properties of the alloy.

关键词： Ni3Al Single crystal alloy Recrystallization Surface layer

Biodegradable Zn-0.5Li alloy rib plate:Processing procedure development and in vitro performance evaluation

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Journal of materials Science & Technology 2023年第10期141卷 245-256页

作者： Jin-Ling Sun Yun Feng Zhang-Zhi Shi Zhe Xue meng Cao Sheng-Lian Yao Zhen Li Lu-Ning Wang Beijing Advanced Innovation Center for materials Genome Engineering School of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijing 100083China Department of Ophthalmology Beijing Key Laboratory of Restoration of Damaged Ocular NervePeking University Third HospitalBeijing 100191China Orthopedics Department Peking University ShouGang HospitalBeijing 100144China Advanced Technology and materials Co. Ltd(AT&M)Beijing 100081China

Trauma kills more than four million people worldwide each year,with chest trauma accounting for 25%of these *** fractures are the main manifestation of chest *** Zn alloys offer a new option to overcome clinical problems caused by permanent rib fracture internal fixation mate-rials,e.g.,long-term stress masking and secondary *** this study,the fabrication procedure of biodegradable Zn-0.5Li alloy rib plates is successfully developed,which consists of casting,hot-warm rolling,cutting,and pressing *** three-point bending performance of the Zn al-loy rib plates is comparable to that of commercial pure Ti rib plates,much higher than that of pure Zn rib *** addition,the Zn alloy exhibits the best antibacterial ability against *** and *** among the three *** the Zn alloy exhibits a weaker mC3T3 cytocompatibility than pure Ti,it is better than pure *** study provides a foundation for the future development of various biodegrad-able Zn alloy rib plates.

关键词： Biodegradable Zn alloy rib plate mechanical properties Corrosion behavior Biocompatibility Antibacterial ability

300 mPa grade highly ductile biodegradable Zn-2Cu-(0.2-0.8)Li alloys with novel ternary phases

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Journal of materials Science & Technology 2023年第26期157卷 234-245页

作者： meng Cao Zhe Xue Zhao-Yong Lv Jin-Ling Sun Zhang-Zhi Shi Lu-Ning Wang Beijing Advanced Innovation Center for materials Genome Engineering State Key Laboratory for Advance Metals and MaterialsSchool of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijing 100083China Orthopedics Department Peking University ShouGang HospitalBeijing 100144China Advanced Technology and materials Co. Ltd.(AT&M)Beijing 100081China Liaocheng People’s Hospital Liaocheng Hospital Affiliated to Shandong First Medical UniversityLiaocheng 252000China

Although a few high-strength biodegradable Zn alloys with yield strengths(YSs)over 300 mPa in rolled state have been developed,their elongations(ELs)are generally less than 30%.This study developed rolled Zn-2Cu-x Li(x=0.2 wt.%,0.5 wt.%,0.8 wt.%)alloys with YSs of 316-335 mPa and ELs of 44%-61%.Three-dimensional atom probe(3DAP)and time of flight secondary ion mass spectrometry(TOF-SImS)were employed to characterize Li *** kinds of Zn-Cu-Li ternary phases are identified,which are blockyε′-(Cu_(0.5),Li_(0.5))Zn 4,blockyβ′-(Li_(0.9),Cu_(0.1))Zn 4,and small roundγparticles with high Li content in the annealed *** identified phases are Zn,β-LiZn 4,andε-CuZn 4 *** the increase of Li content in the alloys,ε′phase with 6.50 at.%Cu transforms intoβ′phase with 2.12 at.%Cu,i.e.,the average level in the ***ε′phase,there exist nano-scale Li clusters andεphase,resulting inε′/ε*** Zn laths precipitate fromβ′phase,resulting inβ′/Zn lamellar *** lamel-lar structure is the matrix of Zn-2Cu-0.8Li and leads to near-isotropic *** tests show that degradation rates fall in the range of 153-196μm/year,which decrease with Li *** the alloys exert positive effects on the growth of mC3T3-E1 cells with 10%*** research reveals how microstructure evolves in Zn-2Cu-x Li alloys,which lays the foundation for their future applications.

关键词： Biodegradable Zn alloys Zn-Cu-Li ternary phase microstructure

Fundamental behaviours of production traffic in underground mine haulage ramps

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International Journal of mining Science and Technology 2015年第1期25卷 7-14页

作者： Haviland David marshall Joshua Golder Associates ltd. The Robert m. Buchan Department of mining Queen’s University

Ramps(or declines) are often used in underground mines to transport ore, waste, materials, and personnel. This paper studies mine ramp productivity and presents results from a set of computer simulations designed to model the fundamental behaviours of ramp haulage systems. Simulations show that, under fundamental assumptions without random disturbances, the haulage system always converges to a periodic behaviour in the steady state, but that productivities vary between equilibria. Simulations also demonstrate how productivity per vehicle does not necessarily decrease as more vehicles are added and,for example, in the five-vehicle case, how a 3.1% improvement can be achieved over the use of four vehicles. The result reveals the inefficiency of commonly-used lockout-style vehicle coordination strategies,and suggests a possible avenue for improving the productivity of haulage ramps by controlling the system to achieve more productive behaviours.

关键词： Underground miningFleet managementDiscrete-time simulationVehicle dispatching

Preparation of Co/S co-doped carbon catalysts for excellent methylene blue degradation

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International Journal of minerals,metallurgy and materials 2025年第1期32卷 169-181页

作者： Haixu Li Haobo He Tiannan Jiang Yunfei Du Zhichen Wu Liang Xu Xinjie Wang Xiaoguang Liu Wanhua Yu Wendong Xue School of materials Science and Engineering University of Science and Technology BeijingBeijing 100083China Beijing Jinyu Tongda Refractory Technologies Co. Ltd.Beijing 100085China

S and Co co-doped carbon catalysts were prepared via pyrolysis of mOF-71 and thiourea mixtures at 800℃at a mass ratio of mOF-71 to thiourea of 1:0.1 to effectively activate peroxymonosulfate(PmS)for methylene blue(mB)*** effects of two different mixing routes were identified on the mB degradation ***,the catalyst obtained by the alcohol solvent evaporation(mOF-AEP)mixing route could degrade 95.60%mB(50 mg/L)within 4 min(degradation rate:K=0.78 min^(-1)),which was faster than that derived from the direct grinding method(mOF-DGP,80.97%,K=0.39 min^(-1)).X-ray photoelectron spectroscopy revealed that the Co-S content of mOF-AEP(43.39at%)was less than that of mOF-DGP(54.73at%),and the proportion of C-S-C in mOF-AEP(13.56at%)was higher than that of mOF-DGP(10.67at%).Density functional theory calculations revealed that the adsorption energy of Co for PmS was -2.94 eV when sulfur was doped as C-S-C on the carbon skeleton,which was higher than that when sulfur was doped next to cobalt in the form of Co-S bond(-2.86 eV).Thus,the C-S-C sites might provide more contributions to activate PmS compared with ***,the degradation parameters,including pH and mOF-AEP dosage,were ***,radical quenching experiments and electron paramagnetic resonance(EPR)measurements revealed that ^(1)O_(2)might be the primary catalytic species,whereas·O~(2-)might be the secondary one in degrading mB.

关键词： advanced oxidation process alcohol solvent evaporation hydrogen bond S and Co co-doped carbon catalysts wastewater remediation

A review on the sealing structure and materials of fuel-cell stacks

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Clean Energy 2023年第1期7卷 59-69页

作者： Jinghui Zhao Huijin Guo Yuchen Xing Shaobo Ping Weikang Lin Yanbo Yang Zixi Wang Tiancai ma School of Automotive Studies Tongji UniversityNo.4800 Caoan HighwayShanghaiP.R.China Institute of Carbon Neutrality Tongji UniversityShanghai200092P.R.China at&m Environmental Engineering Technology Co. LtdNo.76 Xueyuan South RoadHaidian DistrictBeijing100081P.R.China Central Iron and Steel Research Institute Group No.76 Xueyuan South RoadHaidian DistrictBeijing100081P.R.China Department of mechanical Engineering Tsinghua UniversityBeijing 100084P.R.China

Proton-exchange-membrane fuel cells(PEmFCs)have the characteristics of zero emissions,a low operating temperature and high power density,and have great potential in improving energy-utilization ***,fuel cells are still quite expensive as a result of the cost of key components,including the membranes,catalysts and bipolar plates of *** a result of the cost and importance of these items,most researchers have focused on improving the lifetime and performance of fuel-cell stacks in recent *** contrast,seals,sealants and adhesives play a more mundane role in the overall performance of a fuel cell,but failure of these materials can lead to reduced system efficiency,system failure and even safety *** attention has been paid to the performance and durability of these products but as other fuel-cell components improve,these seals are becoming an even more critical link in the long-term performance of fuel *** article highlights the importance and background of fuel-cell *** latest research progress on the mechanical properties and structural optimization of different sealing materials is reviewed.

关键词： proton-exchange-membrane fuel cell sealing structure sealing materials

Dye Aggregation in Ink Jet

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仪器仪表学报 2004年第S3期 216-219+212页

作者： Thomas Paul,Sarfraz Hussain Avecia ltd. manchester m9 8ZS United Kingdom Avecia ltd. manchester m9 8ZS United Kingdom

Dye aggregation has long been recognised as a key factor in performance, and this is no less so in ink jet applications. The aggregation state was shown to be important in many different areas ranging from the use of dyes in photodynamic therapies all the way to colorants for dying of fabrics. Therefore different methods to investigate dye association qualitatively and quantitatively were developed. A simple procedure to study aggregation could be a useful tool to characterise dyes for ink jet printing. It is critically reviewed the methods used to study dye aggregation, and discussed some of the main conclusions. This will be illustrated by examples of ink jet dye aggregation and its study in aqueous and ink systems. The results are used to correlate the solution behaviour of dyes with their print performance.

关键词： Aggregation Lightfastness Shade Ink jet dyes

Study on the hydrogen absorption properties of a YGdTbDyHo rare-earth high-entropy alloy

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International Journal of minerals,metallurgy and materials 2025年第1期32卷 127-135页

作者： Tongyue Li Ziliang Xie Wenjiao Zhou Huan Tong Dawen Yang Anjia Zhang Yuan Wu Xiping Song State Key Laboratory for Advanced metals and materials University of Science and Technology BeijingBeijing 100083China Whole Win(Beijing)materials Sci.&Tech.Co. Ltd.Beijing 100083China

This study investigated the microstructure and hydrogen absorption properties of a rare-earth high-entropy alloy(HEA),*** indicated that the YGdTbDyHo alloy had a microstructure of equiaxed grains,with the alloy elements distributed *** hydrogen absorption,the phase structure of the HEA changed from a solid solution with an hexagonal-close-packed(HCP)structure to a high-entropy hydride with an faced-centered-cubic(FCC)structure without any secondary phase *** alloy demonstrated a maximum hydrogen storage capacity of 2.33 H/m(hydrogen atom/metal atom)at 723 K,with an enthalpy change(ΔH)of-141.09 kJ·mol^(-1)and an entropy change(ΔS)of-119.14 J·mol^(-1)·K^(-1).The kinetic mechanism of hydrogen absorption was hydride nucleation and growth,with an apparent activation energy(E_(a))of 20.90 kJ·mol^(-1).Without any activation,the YGdTbDyHo alloy could absorb hydrogen quickly(180 s at 923 K)with nearly no incubation period *** reason for the obtained value of 2.33 H/m was that the hydrogen atoms occupied both tetrahedral and octahedral *** results demonstrate the potential application of HEAs as a high-capacity hydrogen storage material with a large H/m ratio,which can be used in the deuterium storage field.

关键词： rare-earth high-entropy alloy hydrogen absorption capacity pressure–composition–temperature curves kinetics

Design of Teaching System of Industrial Robots Using mixed Reality Technology

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Computers, materials & Continua 2022年第10期73卷 1317-1327页

作者： Guwei Li Yun Yang Zhou Li Jingchun Fan Zhejiang Dongfang Polytechnic WenZhou325000China Compugen ltd. TorontoM2 J4A6Canada

Traditional teaching and learning about industrial robots uses abstract instructions,which are difficult for students to ***,there are safety issues associated with the use of practical training *** address these problems,this paper developed an instructional system based on mixed-reality(mR)technology for teaching about industrial *** Siasun T6A-series robots were taken as a case study,and the microsoft mR device HoloLens-2 was used as the instructional ***,the parameters of the robots were analyzed based on their structural ***,the robot modules were decomposed,and 1:1 three-dimensional(3D)digital reproductions were created in ***,a library of digital models of the robot components was established,and a 3D spatial operation interface for the virtual instructional system was created in ***,a C#code framework was established to satisfy the requirements of interactive functions and data transmission,and the data were saved in JSON *** this way,a key technique that facilitates the understanding of spatial structures and a variety of human-machine interactions were ***,an instructional system based on HoloLens-2 was established for understanding the structures and principles of *** results showed that the instructional system developed in this study provides realistic 3D visualizations and a natural,efficient approach for human-machine *** system could effectively improve the efficiency of knowledge transfer and the student’s motivation to learn.

关键词： mixed reality space interaction instructional system