检索结果-南通市图书馆

Pressureless two-step sintering of ultrafine-grained refractory metals:Tungsten-rhenium and molybdenum

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2022年第31期126卷 203-214页

作者： Zhongyou que Zichen Wei Xingyu Li Lin Zhang Yanhao Dong Mingli Qin Junjun Yang xuanhui qu Ju Li Beijing Advanced Innovation Center for Materials Genome Engineering Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China Department of Nuclear Science and Engineering Massachusetts Institute of TechnologyCambridgeMA 02139USA Department of Materials Science and Engineering Massachusetts Institute of TechnologyCambridgeMA 02139USA

The challenge of sintering ultrafine-grained refractory metals and alloys to full density is hereby addressed by pressureless two-step sintering in tungsten-rhenium alloy and pure molybdenum. Using properly processed nano powders(~50 nm average particle size), we are able to sinter W-10Re alloy to 98.4% density below 1200 ℃ while maintaining a fine grain size of 260 nm, and sinter molybdenum to 98.3% density below 1120 ℃ while maintaining a fine grain size of 290 nm. Compared to normal sintering,two-step sintering offers record-fine grain sizes and better microstructural uniformity, which translates to better mechanical properties with higher hardness(6.3 GPa for tungsten-rhenium and 4.0 GPa for molybdenum, both being the highest in all pressurelessly sintered samples of the respective material system)and larger Weibull modulus. Together with our previous demonstration in tungsten, we believe that twostep sintering is a general effective method to produce high-quality fine-grained refractory metals and alloys, and the lessons learned here are transferable to other materials for powder metallurgy.

关键词： Powder metallurgy Refractory metals Porosity Two-step sintering Grain growth

DEBINDING　MECHANISM　AND　KINETICS　FOR　PW　IN　PW－WC　FEEDSTOCK　UNDER　AIR　ATMOSPHERE

在线全文

学校读者我要写书评

暂无评论

中国有色金属学会会刊：英文版 1996年第2期6卷 72-75页

作者： Liang Shuquan Huang Baiyun qu xuanhui (National Laboratory for Powder Metallurgy ,Central South University of Technology, Changsha 410083) CENT S UNIV TECHNOL NATL LAB POWDER METCHANGSHA 410083PEOPLES R CHINA

ＤＥＢＩＮＤＩＮＧＭＥＣＨＡＮＩＳＭＡＮＤＫＩＮＥＴＩＣＳＦＯＲＰＷＩＮＰＷ－ＷＣＦＥＥＤＳＴＯＣＫＵＮＤＥＲＡＩＲＡＴＭＯＳＰＨＥＲＥＬｉａｎｇＳｈｕｑｕａｎ；ＨｕａｎｇＢａｉｙｕｎ；ＱｕＸｕａｎｈｕｉ（Ｎａｔｉｏ... 详细信息

ＤＥＢＩＮＤＩＮＧＭＥＣＨＡＮＩＳＭＡＮＤＫＩＮＥＴＩＣＳＦＯＲＰＷＩＮＰＷ－ＷＣＦＥＥＤＳＴＯＣＫＵＮＤＥＲＡＩＲＡＴＭＯＳＰＨＥＲＥＬｉａｎｇＳｈｕｑｕａｎ；ＨｕａｎｇＢａｉｙｕｎ；ＱｕＸｕａｎｈｕｉ（ＮａｔｉｏｎａｌＬａｂｏｒａｔｏｒｙｆｏｒＰ...

关键词： MIM PW-WC feedstock debinding process mechanism, kinetics

Effect of microstructural parameters on the properties of W-Ni-Fe alloys

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2007年第3期26卷 200-204页

作者： S.H. Islam qu xuanhui S.J. Askari M. Tufail and HE Xinbo School of Materials Science and Engineering State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Beijing 100083 China Department of Industrial ＆ Manufacturing Engineering NED University of Engineering ＆ Technology Karachi-75270 Pakistan

The aim of this research was to examine the effect of microstructural parameters on the tensile properties of different compositions of tungsten heavy alloys. The microstructural parameters （grain size, connectivity, contiguity, and solid volume fraction） were measured and were found to have a significant effect on the tensile properties of tungsten-based heavy alloys. The microstructural parameters of W-Ni-Fe alloys are sufficiently different to present a range of mechanical properties. It is concluded that the mechanical properties of tungsten heavy alloys largely depend on the microstructural parameters and their ductility is particularly harmed when grains are contiguous.

关键词： tungsten heavy alloys tensile properties solid volume fraction contiguity

Microstructure, wear resistance, and corrosion performance of Ti35Zr28Nb alloy fabricated by powder metallurgy for orthopedic applications

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2020年第6期41卷 191-198页

作者： Wei Xu Xin Lu Jingjing Tian Chao Huang Miao Chen Yu Yan Luning Wang xuanhui qu Cuie Wen Beijing Advanced Innovation Center for Materials Genome Engineering Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing100083China Central Laboratory Peking Union Medical College HospitalPeking Union Medical College and Chinese Academy of Medical SciencesBeijing100730China School of Engineering RMIT UniversityMelbourne3001Australia

A ternary Ti35Zr28Nb alloy was fabricated by powder metallurgy(PM)from pre-alloyed *** microstructure,hardness,corrosion behavior,and wear response of the produced alloy were investigated *** results show that nearly full dense Ti35Zr28Nb alloy(relative density is 98.1±1.2%)can be fabricated by *** microstructure was dominated with uniform *** Ti35Zr28Nb alloy displayed spontaneous passivity in a naturally aerated simulated body fluid(SBF)solution at 37±0.5°*** Ti35Zr28Nb alloy exhibited the highest corrosion resistance as compared to as-cast Ti6Al4V and pure Ti because of the formation of a protective passive film containing TiO2,Nb2O5,and ZrO2,including the highest corrosion potential(-0.22±0.01 V),the lowest corrosion current density(57.45±1.88 nA),the lowest passive potential(0.05±0.01 V)and the widest passivation range(1.29±0.09 V).Under the same wear condition,the wear rate of the Ti35Zr28Nb alloy(0.0021±0.0002 mm3/m·N)was lower than that of the CP Ti(0.0029±0.0004 mm3/m·N)and close to that of the Ti6Al4V(0.0020±0.0003 mm3/m·N).The wear mechanism of the Ti35Zr28Nb alloy was mainly dominated by abrasive wear,accompanied by adhesive *** highest corrosion resistance together with the adequate wear resistance makes the PM-fabricated Ti35Zr28Nb alloy an attractive candidate for orthopedic implant materials.

关键词： Ti35Zr28Nb Powder metallurgy Microstructure Wear behavior Corrosion resistance

Effect of Deposition Time on Microstructures and Growth Behavior of ZrC Coatings Prepared by Low Pressure Chemical Vapor Deposition with the Br2-Zr-C3H6-H2-Ar System

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2017年第2期32卷 284-288页

作者：马新 LI Yong MEI Min 胡海峰 HE Xinbo qu xuanhui CHEN Si'an Institute of Powder Metallurgy School of Materials Science and Engineering University of Science and Technology Beijing Beijing 10083 China Science and Technology on Advanced Ceramic Fibers and Composites Laboratory School of Aerospace Science and Engineering National University of Defense Technology Changsha 410073 China Science and Technology on Advanced Functional Composites Laboratory Aerospace Research Institute of Materials and Processing Technology Beijing 100076 China

ZrC coatings were deposited on graphite substrates by low pressure chemical vapor deposition（LPCVD） with the Br2-Zr-C3H6-H2-Ar system. The effects of deposition time on the microstructures and growth behavior of ZrC coatings were investigated. ZrC coating grew in an island-layer mode. The formation of coating was dominated by the nucleation of ZrC in the initial 20 minutes, and the rapid nucleation generated a fine-grained structure of ZrC coating. When the deposition time was over 30 min, the growth of coating was dominated by that of crystals, giving a column-arranged structure. Energy dispersive X-ray spectroscopy showed that the molar ratio of carbon to zirconium was near 1：1 in ZrC coating, and X-ray photoelectron spectroscopy showed that ZrC was the main phase in coatings, accompanied by about 2.5mol% ZrO2 minor phase.

关键词： ZrC ultra-high temperature ceramic microstructures growth behaviors chemical vapor deposition

Recent advances in electrospun electrode materials for sodium-ion batteries

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2021年第3期30卷 225-241页

作者： Yao Wang Yukun Liu Yongchang Liu Qiuyu Shen Chengcheng Chen Fangyuan Qiu Ping Li Lifang Jiao xuanhui qu Beijing Advanced Innovation Center for Materials Genome Engineering Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) Nankai UniversityTianjin 300071China China Electronic Product Reliability and Environmental Testing Research Institute(CEPREI) Guangzhou 510610GuangdongChina

Sodium-ion batteries(SIBs)have been considered as an ideal choice for the next generation large-scale energy storage applications owing to the rich sodium resources and the analogous working principle to that of lithium-ion batteries(LIBs).Nevertheless,the larger size and heavier mass of Na^(+)ion than those of Li^(+)ion often lead to sluggish reaction kinetics and inferior cycling life in SIBs compared to the LIB *** pursuit of promising electrode materials that can accommodate the rapid and stable Na-ion insertion/extraction is the key to promoting the development of SIBs toward a commercial ***-dimensional(1 D)nanomaterials demonstrate great prospects in boosting the rate and cycling performances because of their large active surface areas,high endurance for deformation stress,short ions diffusion channels,and oriented electrons transfer ***,as a versatile synthetic technology,features the advantages of controllable preparation,easy operation,and mass production,has been widely applied to fabricate the 1 D nanostructured electrode materials for *** this review,we comprehensively summarize the recent advances in the sodium-storage cathode and anode materials prepared by electrospinning,discuss the effects of modulating the spinning parameters on the materials’micro/nano-structures,and elucidate the structure-performance correlations of the tailored ***,the future directions to harvest more breakthroughs in electrospun Na-storage materials are pointed out.

关键词： Sodium-ion batteries Electrospinning Electrode materials Nanostructures Structure-performance correlations

MECHANICAL PROPERTIES IMPROVEMENT OF TiAl BY MICROSTRUCTURE REFINING

在线全文

学校读者我要写书评

暂无评论

中国有色金属学会会刊：英文版 1995年第4期5卷 79-83页

作者： Huang Baiyun He Yuehui Kong Gaoning qu xuanhui(Powder Metallurgy Research Institute,Central South University of Technology,Changsha 410083) Central South Univ of Technology Changsha China

ＭＥＣＨＡＮＩＣＡＬＰＲＯＰＥＲＴＩＥＳＩＭＰＲＯＶＥＭＥＮＴＯＦＴｉＡｌＢＹＭＩＣＲＯＳＴＲＵＣＴＵＲＥＲＥＦＩＮＩＮＧＨｕａｎｇＢａｉｙｕｎ；ＨｅＹｕｅｈｕｉ；ＫｏｎｇＧａｏｎｉｎｇ；ＱｕＸｕａｎｈｕｉ（Ｐｏｗｄ... 详细信息

ＭＥＣＨＡＮＩＣＡＬＰＲＯＰＥＲＴＩＥＳＩＭＰＲＯＶＥＭＥＮＴＯＦＴｉＡｌＢＹＭＩＣＲＯＳＴＲＵＣＴＵＲＥＲＥＦＩＮＩＮＧＨｕａｎｇＢａｉｙｕｎ；ＨｅＹｕｅｈｕｉ；ＫｏｎｇＧａｏｎｉｎｇ；ＱｕＸｕａｎｈｕｉ（ＰｏｗｄｅｒＭｅｔａｌｌｕｒｇｙＲｅｓｅａ...

关键词： intermetallic compounds mechanical properties microstructure

Sintering mechanism of Cu-9Al alloy prepared from elemental powders

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2019年第4期29卷 425-431页

作者： Zhenghua Deng Haiqing Yin Cong Zhang Guofei Zhang Tong Zhang ZiKui Liu Haibao Wang xuanhui qu Collaborative Innovation Center of Steel Technology University of Science and Technology Beijing Beijing Advanced Innovation Center for Materials Genome Engineering Institute for Advanced Materials and Technology University of Science and Technology Beijing Department of Materials Science and Engineering The Pennsylvania State University Chongqing Engineering Technology Research Center for Light Alloy and Processing Chongqing Three Gorges University

The sintering behavior of Cu-9A1 alloys prepared from die pressing of elemental powders was *** experimental results and kinetic analysis showed the formation of three consecutive layers of Al;Cu,Al;Cu;,and AlCu phases,with Al;Cu appearing first in the initial solid phase sintering stage.A liquid phase formed in the intermediate stage,resulting from the eutectic reaction between A1 and Al;Cu phases at 500℃,which is 47℃lower than the equilibrium reaction *** occurred when the liquid phase infiltrated the gaps between the copper particles,leaving pores at the original sites of A1 particles and Al;*** the final stage of sintering,the Al-rich phases（Al;Cu and AlCu） transformed to Al-poor phases（Al;Cu;and a-Cu） in the temperature range of 500-565℃.Al;Cu;and a-Cu then transformed to AlCu;（β） above the eutectoid reaction temperature（565℃）,whereas AlCu;transformed to a-Cu and eutectoid phases（α-Cu+Al;Cu;） during *** pure copper transformed to AlCu;) and the pore volume decreased at 1000℃.The microstructure study helps manipulate precisely the sintering process of Cu-Al alloys and optimize the microstructure with a high dimensional accuracy.

关键词： Cu-9Al alloy Liquid phase sintering Swelling behavior Diffusion

Data-driven design of Ni-based turbine disc superalloys to improve yield strength

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2023年第24期155卷 175-191页

作者： Bin Xu Haiqing Yin Xue Jiang Cong Zhang Ruijie Zhang Yongwei Wang xuanhui qu Zhenghua Deng Guoqiang Yang Dil Faraz Khan Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology Beijing Beijing 100083 China Collaborative Innovation Center of Steel Technology University of Science and Technology Beijing Beijing 100083 China Beijing Key Laboratory of Materials Genome Engineering University of Science and Technology Beijing Beijing 100083 China Institute for Advanced Materials and Technology University of Science and Technology Beijing Beijing 100083 China School of Mechanical Engineering Chongqing Three Gorges University Chongqing 404000 China School of Mechanical and Equipment Engineering Hebei University of Engineering Handan 056038 China Department of Physics University of Science and Technology Bannu Bannu 28100 Pakistan

Increasing the thrust-weight ratio of aeroengines requires development of high-strength and stable high-temperature materials. A data-driven design of Ni-based turbine disc superalloys is performed to improve the yield strength to reach the target. Through first-principles calculations determining the design superalloy system, the theoretical models and Calculation of Phase Diagram (CALPHAD) screening compositions, and machine learning extrapolating prediction, 14 compositions are selected from 2,865,039 composition combinations. Ni-17Cr-8Co-1Mo-1W-6Al-3Ti-1Nb-1Ta is selected to verify the design accuracy. Experimental tests prove that the designed alloy has trade-offs of microstructure with satisfying design targets, and then, the yield strength is higher in the designed alloy than in commercial superalloys, reaching 728 MPa at 850 ℃. A scheme for increasing the performance of the designed alloy is proposed by discussing the strengthening mechanisms, machine learning process, and alloying chemistry effect. The cross-scale data-driven design is regarded as an accurate and efficient way to design novel high-strength Ni-based turbine disc superalloys, whose significance is the obvious reduction of trial-and-error tests.

关键词： Ni-based superalloys Data-driven design Machine learning CALPHAD First-principles calculation