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Effect of deep cryogenic treatment on martensitic lath refinement and nano-twins formation of low carbon bearing steel

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Journal of Iron and Steel Research International 2020年第1期27卷 105-113页

作者： Xin-yang Lü Zhi-wei Wu xiao He Jun Li Shao-hong Li Mao-sheng Yang Kun-yu Zhao Faculty of Material Science and Engineering Kunming University of Science and TechnologyKunming 650093YunanChina Institute for Special Steels Central Iron and Steel Research InstituteBeijing 100081China

The effect of heat treatment and deep cryogenic treatment on microstructural evolution of low carbon martensitic bearing steel was *** experimental results showed that the lath martensite was obtained by quenching and a few twins as substructures formed in some martensitic *** rudiment of sub-interfaces of martensitic lath was formed in the highdensity dislocation regions after deep cryogenic treatment;meanwhile,the number of twins increased,especially in the highdensity dislocation *** phenomenon is due to the increase in internal stress caused by cryogenic *** tempering,the rudiment of sub-interface further evolved into the martensitic lath boundary,and thus the original martensitic laths were *** twins formed by cryogenic treatment did not disappear after *** addition,small quantities of annealing twins formed in tempering *** laths morphology and substructures in different stages of the heat and deep cryogenic treatment were observed by tninsmission electron microscopy.

关键词： Low carbon bearing steel-Deep cryogenic treatment Internal stress Sub-interface Nano-twin

Effects of Different Plant Hormones for Microbial Degradation of PASHs and Diesel under Aerobic Conditions

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China Petroleum Processing & Petrochemical Technology 2021年第1期23卷 111-119页

作者： Shang Xiufang Li Lin xiao Xinfeng Xue Jianliang Gao yu Gao Hongge Hu Shugang College of Safety and Environmental Engineering Shandong University of Science and TechnologyQingdao 266590 State Key Laboratory of Petroleum Pollution Control China National Petroleum CorporationBeijing 102206

The effects of plant hormones for biodegradation of polycyclic aromatic sulfur heterocycles(PASHs)and diesel fuel were *** butyric acid(IBA)and gibberellin were found to promote biodegradation of DBT and diesel,*** of plant hormones,pH,temperature,soil moisture and substrate concentrations were optimized in microbial metabolic *** main factors including temperature and IBA concentration were determined by factor analysis in DBT *** soil moisture and diesel concentration were important factors in diesel *** sites between cell surface and DBT or diesel components were performed by molecular operating environment(MOE).This study suggested that plant hormones could be applied to effectively remove pollutants in environment.

关键词： plant hormones PASHs diesel bioremediation oil-polluted soil

High-temperature deformation behaviors of Ti-2Al-9.2Mo-2Fe alloy with boron

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Rare Metals 2023年第5期42卷 1695-1705页

作者： Rong Chen Song-xiao Hui Wen-Jun Ye Yang yu Xu-Jun Mi Dong-Geun Lee Yong-Tai Lee State Key Laboratory for Nonferrous Metal and Processing General Research Institute for Nonferrous MetalsBeijing100088China Department of Materials Metallurgical Engineering Sunchon National UniversitySunchon57922Korea Department of Nano New Materials Kyungnam UniversityChangwon51767Korea

Hot deformation behaviors of Ti-2Al-9.2Mo-2Fe alloy with boron were investigated in a hot compression test at temperatures ranging from 850 to 1000℃and strain rates ranging from 0.01 to 10.00 s^(-1).With strain rate decreasing and deformation temperature increasing,dynamic recrystallization(DRX)was promoted in both *** nucleation mechanism of DRX involved grain boundary bulging and subgrain *** case of deformation at low temperatures and high strain rates,the boronfree alloy only showed dynamic recovery(DRV)***,due to the particle-stimulated nucleation mechanism of recrystallization by TiB particles,the boron-containing alloy shows DRX at that *** DRX grain nuclei are formed by lattice rotation and subgrain growth from deformation zone in the initial grains,which are close to those of TiB ***,the flow stress of the boron-containing alloy is lower than that of the boron-free alloy due to the grain refinement during hot deformation process.

关键词： Newβtitanium alloy Boron addition Hot deformation Particle-stimulated nucleation Dynamic recrystallization

Eutectic high entropy alloy syntactic foam

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Journal of Materials Science & Technology 2023年第18期149卷 177-189页

作者： Jin Meng yu Qiao Tian-Wei Liu yuan-yuan Tan Fu-Hua Cao Yan Chen Hai-ying Wang Lan-Hong Dai State Key Laboratory of Nonlinear Mechanics Institute of MechanicsChinese Academy of Sciences(CAS)Beijing 100190China State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing 100081China School of Engineering Science University of Chinese Academy of SciencesBeijing 101408China CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern MechanicsUniversity of Science and Technology of ChinaHefei 230027China

High-strength metallic foams have a wide range of applications in engineering as lightweight structural and energy-absorbing ***,it is challenging to obtain metallic foam with both good energy absorption performance and high ***,we developed a novel metal matrix syntactic foam fabri-cated with AlCoCrFeNi_(2.1) eutectic high entropy alloy and alumina cenospheres that exhibits a remarkable combination of high strength and energy absorption performance under both quasi-static and dynamic *** porous structure of syntactic foam fully exploits the properties of the AlCoCrFeNi_(2.1) alloy matrix with a unique FCC/B2 dual-phase eutectic microstructure and thus yields exceptional *** discovered that this dual-phase microstructure not only provides high strength but also allows the pores to collapse in a progressive and diffusive way,which enables the formation of a high and smooth energy absorption *** is found that the heterogeneity between the two phases in the matrix can provide back stress strengthening,and it also induces multiple micro shear bands and microcracks as additional energy dissipation modes as the deformation *** unique mechanism ensures the strength of microstructures and makes them fracture promptly,which causes the balance of strengthening and softening on the macro *** work opens the avenue for developing advanced high-strength lightweight structural and energy-absorbing materials.

关键词： Eutectic high entropy alloy Foams Metal matrix composites(MMCs) Energy absorption

An anthraquinone-based Cu(I) cyclic trinuclear complex for photo-catalyzing C–C coupling reactions

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Science China Chemistry 2023年第12期66卷 3525-3531页

作者： yu-Mei Wang Kai-Ming Mo xiao Luo Ri-Qin Xia Jing-Yi Song Guo-Hong Ning Dan Li College of Chemistry and Materials Science Guangdong Provincial Key Laboratory of Functional Supramolecular Coordination Materials and ApplicationsJinan UniversityGuangzhou 510632China

Development of transition metal-based photocatalysts with low cost, strong visible light absorption, and high efficiency is a longstand pursuit for advanced organic synthesis, yet remains highly challenging. In this article, an anthraquinone-based copper(I)cyclic trinuclear complex(1) was designed and it featured strong visible light absorption, high charge separation efficiency and photochemical properties. Complex 1 as a heterogeneous photocatalyst can efficiently catalyze homo-coupling of terminal alkynes and denitrification-oxidative coupling reaction between hydrazinopyridine and terminal alkynes with excellent yield(up to 99%), broad substrate tolerance(27 examples) and superior reusability(up to 10 cycles without loss of performance) under mild conditions.

关键词： cyclic trinuclear complex photocatalysis C–C coupling reaction

Enhanced maximum energy product of(SmY)FeN caused by abundant yttrium doping

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Journal of Rare Earths 2020年第10期38卷 1060-1068,I0002页

作者： Jianwei Xu jingwu Zheng Haibo Chen Liang Qiao Yao ying Wei Cai Wangchang Li Jjing yu Min Lin Shenglei Che Research Center of Magnetic and Electronic Materials College of Materials Science and Engineering.Zhejiang University of TechnologyHangzhou 310014China Hangzhou Haisheng Technology Co. LtdHangzhou 310019China Key Laboratory of Magmetic Materials and Devices.Ningbo Institute of Material Technologv&Engineering.Chinese Academy of Science Ningbo 315201China

Replacement of samarium(Sm) with abundant yttrium(Y) can help solve the potential shortage of Sm in the preparation of promising Sm2 Fe17 Nx *** this article,phase composition,microstructure and magnetic properties of(Sm1-yYy)2 Fe17Nx(y=0,0.2,0.4,0.6,0.8,1.0) were *** energy product(BH)max is improved when less than 40 at% Y is doped in(Sm1-yYy)2 Fe17Nx *** particular,when 20 at% Y replaces Sm,(BH)max of(Sm1-yYy)2 Fe17Nx powder increases by 15.1% from 131.7 to151.6 kJ/*** effect of annealing temperature on the structural properties of high Y doping(Sm0.6Y0.4)2 Fe17 and the magnetic properties of the corresponding nitrides were subsequently *** the RE2 Fe17 phase grain combination process,the interlaced structure of the rhombohedral Th2 Zn17-type structural phase and the hexagonal Th2 Ni17-type structural phase is *** to shortrange exchange coupling,the nitride with the highest content of two interlaced RE2 Fe17 phases has the highest magnetic properties:Br=1.23 T,HcJ=443.9 kA/m and(BH)max=197.6 kJ/m3.

关键词： Sm2Fe17Nx Y substitution Maximum energy product Annealing temperature Coexisting RE2Fe17 phases Rare earths

Single-bit full adder and logic gate based on synthetic antiferromagnetic bilayer skyrmions

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Rare Metals 2022年第7期41卷 2249-2258页

作者： Kai yu Mak Jing Xia Xi-Chao Zhang Li Li Mouad Fattouhi Motohiko Ezawa xiao-Xi Liu Yan Zhou School of Science and Engineering The Chinese University of Hong KongShenzhen 518172China College of Physics and Electronic Engineering Sichuan Normal UniversityChengdu 610068China Department of Electrical and Computer Engineering Shinshu UniversityNagano 380-8553Japan Department of Applied Physics University of SalamancaSalamanca 37008Spain Department of Applied Physics University of TokyoTokyo 113-8656Japan

Skyrmion-based devices are promising candi-dates for non-volatile memory and low-delay time *** skyrmion-based devices execute operation by controlling skyrmion trajectory,which can be impeded by the skyrmion Hall ***,the design of skyrmion-based arithmetic devices built on synthetic antiferromag-netic(SyAF)structures is presented,where the structure can greatly suppress skyrmion Hall *** this study,the operations of skyrmion-based half adder,full adder,and XOR logic gate are executed by introducing geometric notches and tilted edges,which can annihilate or diverge *** of these skyrmion-based devices is evaluated,where the delay time and energy-delay product of the single-bit full adder are 1.95 ns and 2.50×10^(-22)Js,which are only 12%and 79%those of the previously proposed skyrmion-based single-bit full *** improvement is significant in the construction of ripple-carry adder and ripple-carry ***,our skyrmion-based SyAF arithmetic device is a promising candidate to develop high-speed spintronic devices.

关键词： Skyrmion Full adder Synthetic antiferromagnet Lowdelaytime electronics Micromagnets

A pilot study of aortic hemodynamics before and after thoracic endovascular repair with a double-branched endograft

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Medicine in Novel Technology and Devices 2019年第4期4卷 7-23页

作者： yu Zhu Wenbo Zhan Mohamad Hamady xiao yun Xu Department of Chemical Engineering Imperial College LondonUK Department of Interventional Radiology St Mary’s HospitalImperial College Healthcare NHS TrustLondonUK

Branched endografts have been developed to treat complex pathology in the aortic arch and ascending *** study aims to evaluate the haemodynamic performance of a double-branched thoracic endograft by detailed comparison of flow patterns and wall shear stress in the aorta and supra-aortic branches before and after stentgraft ***-and post-intervention CT images were acquired from two patients who underwent thoracic endovascular aortic repair(TEVAR)with a double-branched endograft for thoracic aortic *** images were used to reconstruct patient-specific models,which were analysed using computational fluid dynamics employing physiologically realistic boundary *** results showed that there was sufficient blood perfusion through the arch *** presence of inner tunnels caused flow derangement and asymmetric wall shear stress in the ascending aorta,where shear range index was up to 6 times higher than in the preintervention *** shear stress in the aortic arch increased considerably after intervention as a result of accelerated *** maximum flow-induced displacement forces on the branched endografts were around 22 N for both patients,which was below the threshold for device *** from this pilot study demonstrated that aortic flow patterns were significantly altered by the branched endograft which caused increased spatial variation of wall shear stress in the ascending aorta and the *** no obvious adverse hemodynamic features were found immediately after intervention for the cases we analysed,follow-up studies will be needed to assess durability of the device.

关键词： Thoracic endovascular aortic repair(TEVAR) Aortic arch Branched endograft Blood flow Computational fluid dynamics

Changes in Activities of Three Enzymes Degrading Galactomannan During and Following Rice Seed Germination

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Rice science 2007年第4期14卷 295-301页

作者： REN Yan-fang HE Jun-yu WANG xiao-feng College of Life Science South China Agricultural University Guangzhou 510642 China College of Agriculture Guizhou University Guiyang 550025 China

To investigate the relationships among β-mannanase, β-mannosidase and a-galactosidase required for degrading galactomannan in cell wall during and following rice seed germination, the activities of the three enzymes and the effects of ABA and GA3 on them were surveyed. The activities of β-mannosidase and a-galactosidase presented in dry and pre-germinated rice seeds, and increased slowly during and following germination. However, the activity of β-mannanase was detected only after germination. GA3 could promote the activities of β-mannanase and a-galactosidase. ABA had little effect on the activities of β-mannosidase and α-galactosidase, but it could seriously inhibit the activity of β-mannanase.

关键词： germination β-mannanase β-mannosidase α-galactosidase enzyme activity rice