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Science China Chemistry 2025年

作者： Haoyue Liang Xingguo Zhong Guxin Huang Wenpan Liu Yao Liu Shuhao Wang Deyu Wang Hao Liu Hao Wang Tianyou Zhai Huiqiao Li state key laboratory of Materials Processing and die & mould technology School of Materials Science and Engineering Huazhong University of Science and Technology Shenzhen Research Institute of Huazhong University of Science and technology key laboratory of Optoelectronic Chemical Materials and Devices (Ministry of Education) School of Optoelectronic Materials &Technology Jianghan University Centre for Clean Energy technology Faculty of Science University of Technology Sydney Yichang Brunp Recycling technology Co. Ltd.

Li3VO4has been a promising insertion anode material for Li-ion batteries,which has high theoretical capacity (up to～600 mAh g-1) and safe Li insertion voltage （0.5–1 V ***/Li+）.However,the low initial Coulombic efficiency （ICE） has always been the bottleneck limiting its ***,we propose a facile pre-lithiation method to controllably elevate the ICE by the post-treatment of the prepared Li3VO4composite electrode based on an immersion *** this process,the whole electrode was immersed in the liquid Li source,via which the ICE of the Li3VO4electrode can be controllably elevated from 80%to over 100%within 5 min of *** than the traditional powder treatment for pre-lithiation,this process we proposed minimizes the impact of pre-lithiation on the battery assembly ***,we further investigated the effect of this pre-lithiation process on the functional components in the *** the first time the ICE of Li3VO4electrode was elevated to 100%.As a result,the initial reversible capacity of LiFePO4||Li3VO4full cell was improved from 44.0 to146.3 m Ah g-1,demonstrating the feasibility and great potential of the process.

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Structural transformation and rheological processes in bulk metallic glass Zr_(41)Ti_(14)Cu_(12.5)Ni_(10)Be_(22.5)

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中国有色金属学会会刊：英文版 2004年第2期14卷 218-222页

作者：王敬丰蒲健邹辉甘章华柳林肖建中 state key lab of die and mould technology

The temperature dependence of strain and strain rate of the Zr41Ti14Cu12.5Ni10Be22.5（Vit1） bulk metallic glass （BMG） under constant heating condition was derived from the static extension method with a dynamic thermal mechanical analyzer （DMA）. A few strain rate peaks, which corresponds to the glass transition and multistep crystallization in the differential scanning calorimeter （DSC） examination, were observed in the curves of the relation between strain rate and temperature. The onset of viscous flow and the end of glass transition are interrelated, the first and second strain rate peaks correspond with the first and second crystallization transition processes, respectively. The influence of stress on strain and strain rate was researched. It is found that the rheological behaviour of BMG Vit1 changes from elasticity to anelasticity, finally to the Newtonian viscous flow along with increasing temperature.

关键词： Zr41Ti14Cu12.5 锆合金大块金属玻璃流变学结构转变 BMG DMA DSC

Characterization of phase transformation and microstructure of nano hard phase Ti(C,N)-based cermet by spark plasma sintering

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中国有色金属学会会刊：英文版 2004年第3期14卷 510-515页

作者：丰平熊惟皓李鹏余立新夏阳华 state key laboratory of die & mould technology

By means of optical microscope , scanning electron microscope （SEM） and transmission electron microscope （TEM）, the process of densification, the characterization of phase transformation and the microstructure for spark plasma sintering （SPS） nano hard phase Ti（C,N）-based cermet were investigated. It is found that the spark plasma sintering （SPS） enables the nano hard phase Ti（C,N）-based cermet to densify rapidly, however, the full densification of the sintered samples can not be obtained. The rate of phase transformation is significantly quick. When being sintered at 1 200 ℃ for 8 min, Mo2C is completely dissolved, and TiN dissolves into TiC entirely and disappears. Above 1 200 ℃, Ti（C,N） begins to decompose and the atoms of C and N separate from Ti（C,N） resulting in the generation of N2 and the graphite. Due to the denitrification and the graphitization, the density and the hardness of sintered samples are rather low. The distribution of grain size of the sample sintered at 1 350 ℃ covers a wide range of 90500 nm, and most of the grain size are about 200 nm. The hard phase is not of typical core-rim structure. Oxides on the surface of particles can not be fully removed and present in sample as titanium oxide TiO2. Graphite exists in band-like shape.

关键词：火花等离子烧结金属陶瓷粉末冶金相变显微结构硬质相 TEM SPS 纳米相

Microstructure and properties of rheo-diecast Al-20Si-2Cu-1Ni-0.4Mg alloy with direct ultrasonic vibration process

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中国有色金属学会会刊：英文版 2010年第S3期20卷 763-767页

作者：吴树森钟鼓万里安萍毛有武 state key lab of Materials Processing and die & mould technology Huazhong University of Science and Technology

The microstructure and properties of Al-20Si-2Cu-1Ni-0.4Mg alloy fabricated with semi-solid rheo-diecasting process were studied.A newly developed direct ultrasonic vibration process(DUV process) was used in the preparation of the semi-solid slurry of this *** results show that the primary Si particles in this alloy is about 20 μm in size under DUV for 90 s in the semi-solid temperature range,compared to about 30 μm in the alloy without *** is discovered that the primary Si particles distribute more homogeneously and have regular shape,but have lower volume fraction after *** tensile strength at room temperature is about 310 MPa,and the tensile strength and elongation of the semi-solid die castings are increased by 34% and 45%,respectively,compared with the traditional liquid die *** high-temperature tensile strength at 300 ℃ of this high Si aluminum alloy reaches 167 MPa,and the coefficient of thermal expansion is 17.37×10-6/℃ between 25 and 300 ℃.This indicates that this high Si content Al-Si alloy produced with the DUV process is suitable to be used in the manufacture of pistons or other heat-resistant parts.

关键词： semi-solid metals rheocasting Al-Si alloy ultrasonic vibration properties

Effect of semi-solid processing on microstructure and mechanical properties of 5052 aluminum alloy

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中国有色金属学会会刊：英文版 2010年第S3期20卷 758-762页

作者：吕书林吴树森朱泽明安萍毛有武 state key lab of Materials Processing and die & mould technology Huazhong University of Science and Technology

The microstructure and mechanical properties of rheocasted 5052 aluminum alloy were *** semi-solid slurry of this alloy was prepared by ultrasonic vibration(USV) process and then shaped by gravity casting(GC) and high press diecasting(HPDC).The experimental results indicate that fine and globular primary α(Al) particles are distributed uniformly in the rheocasting *** tensile strength and elongation of the rheo-GC sample are 191 MPa and 7.5%,*** with the conventional GC samples,they increase by 22.4% and 82.9% *** tensile strength and elongation of the rheo-HPDC samples reach 225 MPa and 8.6%,respectively,and they are 14.8% and 75.5% higher than those of the conventional HPDC samples,*** is also found that the ductile fracture mode prevails in the rheocasting samples.

关键词： ultrasonic vibration rheocasting 5052 aluminum alloy mechanical properties fracture surface

Electrochemical performance of microarc oxidation films formed on AZ91D alloy in two group electrolytes

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中国有色金属学会会刊：英文版 2005年第4期15卷 777-783页

作者：王立世蔡启舟魏伯康刘全心 state key laboratory of die and mould technology Huazhong University of Science and Technology

The phase composition and electrochemical performances of microarc oxidation（MAO） films prepared on AZ91D alloy by using step-down current method in a phosphate electrolyte（P-film） and silicate electrolyte（Si-film） were studied. The results show that P-film is mainly composed of Mg, MgAl2O4 and MgO, and Si-film is composed of Mg2SiO4 and MgO. There clearly exists a fluoride-enriched zone with the thickness of about 12μm for P-film and 0.71μm for Si-film at the MAO coating/substrate interface. The electrochemical tests show that both P-film and Si-film can enhance the corrosion resistance of AZ91D magnesium alloy significantly. The corrosion failure process of the two films in 5%（mass fraction） NaCl solution is quite different.

关键词：有色金属电化学 AZ91D合金氧化反应

Fabrication and Microstructure Evolution of Niobium-Niobium Silicide Composites by Spark Plasma Sintering

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Journal of Wuhan University of technology(Materials Science) 2007年第2期22卷 299-302页

作者：陈哲严有为 state key lab of die & mould technology Huazhong University of Science & Technology

By using Nb and Si elemental powders as raw materials, dense Nb/NbsSi3 composites were successfully fabricated by a spark plasma sintering （SPS） technology. The microstructure of the fabricated composites was analyzed by OM, SEM, XRD and EPMA; the microstructure evolution of the composites was also investigated by a quenching test. The experimental results show that the prepared composites consist of Nb and Nb5Si3 phases; Nb particle uniformly distributes in the in-situ synthesized Nb5Si3 matrix. During the SPS process, an interfacial reaction occurs between Nb and Si particles to synthesize Nb5Si3 until reactant silicon has been completely depleted.

关键词： spark plasma sintering Nb/Nb5Si3 composites fabrication microstructure evolution

Effect of sintering on microstructures and properties of sub-micron Ti(C,N)-based cermets

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中国有色金属学会会刊：英文版 2004年第3期14卷 485-490页

作者：余立新熊惟皓郑勇李国安 state key laboratory of die & mould technology College of Materials Science and Engineering

The influence of different sintering processes, including vacuum sintering, vacuum sintering followed by HIP and sintering-HIP, on the microstructure and properties of sub-micron Ti(C,N) cermets with various binder contents was studied. Image analysis based on back-scattered electrons image observations was used to determine the morphologic and structural characteristics. Transverse rupture strength(TRS), hardness, fracture toughness were measured and TRS data were treated by Weibull statistics further. It is shown that a very significant improvement in TRS can be obtained by HIP or sintering-HIP treatment for the alloys with lower and middle binder content at the controlled cooling rate, but the effect is not obvious for the alloys with higher binder content. HIP is also helpful for improving the hardness of sub-micron Ti(C,N) cermets, however, but can lower the fracture toughness. The variation of these properties was interpreted in terms of the difference in morphologic and structural characteristics.

关键词：粉末冶金碳化钛氮化钛金属陶瓷烧结显微结构性能

Preparation of Al matrix nanocomposites by diluting the composite granules containing nano-SiCp under ultrasonic vibaration

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Journal of Materials Science & technology 2018年第9期34卷 1609-1617页

作者： Shulin Lü Pan Xiao Du Yuan Kun Hu Shusen Wu state key laboratory of Materials Processing and die & mould technology Huazhong University of Science and Technology

In this work, an efficient process by diluting the nano-SiCp/Al composite granules in the molten matrix under ultrasonic vibration（UV） was developed to prepare metal matrix nano-composites（MMNCs）.Millimeter-sized composite granules with high content of SiC particle（8 wt%） were specially fabricated by dry high-energy ball milling（HBM） without process control agent, and then remelted and diluted in molten Al alloy under UV. The MMNCs melt was finally squeeze cast under a squeeze pressure of 200 MPa, Microstructure of the composite granules during dry HBM was investigated, and the effect of UV on microstructure and mechanical properties of the MMNCs was discussed. The results indicate that nano-SiC particles are uniformly distributed in the nano-SiCp/Al composite granules, which are covered by vestures of pure Al. During diluting, nano-SiC particles released from the composite granules are quickly dispersed in the molten matrix by UV within 4 min. Microstructure of MMNCs is significantly refined under UV and squeeze casting, eutectic Si phase modified to fine islands with an average length of 1.4 μm. Tensile strength of the squeeze cast MMNCs with 1 wt% of nano-SiC particles is 269 MPa, which is improved by 25% compared with the A356 alloy matrix.

关键词： Al matrix nano-composites Dry high-energy ball milling Ultrasonic vibration Composite granules Microstructure

Modelling of dynamic recrystallization kinetics of 300M steel at high strain rates during hot deformation

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Science China(Technological Sciences) 2019年第9期62卷 1534-1544页

作者： GUO Peng DENG Lei WANG XinYun LI JianJun state key laboratory of Materials Processing and die & mould technology Huazhong University of Science and Technology

The flow curves of 300M steel exhibit a transition from stress peak presence to stress peak absence as the strain rate increases. It is difficult to establish dynamic recrystallization(DRX) kinetics models suitable for strain rates where there are no stress peaks in the flow curves using the existing Avrami equation, and the optimal processing parameters for forging can be scarcely *** this study, the high-temperature flow and DRX behavior of 300M steel are investigated by performing isothermal compression tests at temperatures between 1173–1423K with strain rates between 0.001–50 s-1. Distinct stress peaks can be found in the flow curves at low strain rates, and the average grain size decreases with the increase in the strain rate at the same temperature. The DRX mechanism is a discontinuous DRX, and the grain boundary migration plays an important role in the DRX process. In contrast, no stress peak is observed in the flow curves at high strain rates, and the average grain size no longer decreases with the strain rate increase at the same temperature. The DRX mechanism in this case is a continuous DRX. The demarcated strain rate is calculated based on the characteristics of the obtained flow curves and grain sizes. The recrystallization volume fraction model and prediction grain size model at high strain rates are established. In combination with the existing DRX kinetics models at low strain rates, the processing parameters can be optimized to produce components with excellent mechanical properties.

关键词： 300M steel flow curves demarcated strain rate dynamic recrystallization grain size