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Austenite grain growth of medium-carbon alloy steel with aluminum additions during heating process

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International Journal of Minerals,Metallurgy and Materials 2019年第3期26卷 282-290页

作者： Zi-yi Liu Yan-ping Bao Min Wang Xin Li Fan-zheng Zeng State key Laboratory of Advanced Metallurgy University of Science and Technology Beijing Xiangtan Iron & Steel Co. Ltd.of Hunan Valin

In this study, the effects of heating temperature(850–1100°C) and holding time(30–150 min) on the grain growth behavior of austenite in medium-carbon alloy steel were investigated by conducting experiments. The abnormal grain growth and mixed grain structure phenomenon are explained using an equilibrium precipitation phase diagram calculated by Thermo-Calc software package. The Al N particles were observed by field-emission scanning electron microscopy(FESEM), and the amount of AlN precipitations was detected by electron probe microanalysis(EPMA). Based on the research results, it was found that the average grain size of austenite in the test steel increased continuously with the increase of temperature and holding time. Furthermore, the abnormal growth of austenite occurred in the test steel at 950°C, and the heating temperature affected the austenite grain size more significantly. In addition, the decline in the amount of AlN second-phase particle in the test steel, which weakened the "pinning" effect on austenite grain boundaries, resulted in abnormal growth and the development of mixed austenite grain structures. The prediction model for describing the austenite grain growth of medium-carbon alloy steel during heating was established by regression analysis of the experimental data, and the model was verified to be highly accurate.

关键词： alloy steel austenite grain AlN growth model

A novel chitosan nanocapsule for enhanced skin penetration of cyclosporin A and effective hair growth in vivo

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Nano Research 2019年第12期12卷 3024-3030页

作者： Jin Sil Lee Youngmin Hwang Hyeryeon Oh Sunghyun Kim Jin-Hwa Kim Jeung-Hoon Lee Yong Chui Shin Giyoong Tae Won II Choi Center for Convergence Bioceramic Materials Convergence R&D DivisionKorea Institute of Ceramic Engineering and Technology202Osongsaengmyeong l-rof Osong-eupHeungdeok-guCheongjuChungbuk 28160Republic of Korea School of Materials Science and Engineering Gwangju Institute of Science and Technology123 Cheomdan-gwagiroBuk-guGwangju 61005Republic of Korea SKINMED Co. Ltd.Daejeon 34028Republic of Korea Amicogen Inc.64 Dongburo 1259JinsungJinju 52621Republic of Korea

Hair loss due to medical conditions,such as alopecia,male pattern baldness,and cancer chemotherapy treatment,has been a comm onproblem for many in *** n A(CsA),a fungal metabolite,has been reported to be a hair growth modulatory agent and is apotential drug for hair ***,the effect of topical application of CsA is limited by its poor water *** deliverysystems developed to enhance its solubility still showed poor skin *** overcome these limitations,in this study,we have developed a novel chitosan nanocapsule platform using Pluro nic F127 and chitosan without any chemical crosslinking or complicated preparati on steps for the enhanced water solubility and high tran sdermal penetration of *** chitosan nanocapsules(ChiNCs)optimized in terms of structural stability by using chitosan with various molecular weights ranging from 3 to 100 kDa enhanced the skin permeation of CsA through humancadaver skin in *** administration of the CsA loaded ChiNCs in creased the hair follicles by c.a.7 times higher than that of thecontrol group,and effectively induced hair growth in C57BL/6 mice in *** results suggest that ChiNCs could be used as a platform foreffective transdermal delivery of various hydrophobic drugs.

关键词： chitosan nanocapsule cyclosporin A transdermal delivery hair growth

Phase constitutions,growth pattern and mechanical properties of Mg-1.4Gd-1.2Y-xZn-0.15Zr(at%) alloys

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Journal of Rare Earths 2020年第3期38卷 315-323页

作者： Dongjie Chen Yongjun Li Kui Zhang Xinggang Li Minglong Ma Guoliang Shi Jiawei Yuan Ting Li State Key Laboratory of Nonferrous Metals and Process GRINM Group Co.Ltd. Beijing 100088 China GRIMAT Engineering Institute Co. Ltd. Beijing 101407 China General Research Institute for Nonferrous Metals Beijing 100088 China National Center of Analysis and Testing for Nonferrous Metals and Electronic Materials GRINM Group Co.Ltd. Beijing 100088 China Guobiao(Beijing)Testing&Certification Co. Ltd. Beijing 100088 China

The effects of minor Zn(0.2 at%,0.4 at%,0.6 at%) on the microstructures and mechanical properties of Mg-1.4 Gd-1.2 Y-0.15 Zr(at%) alloys were systematically *** reveal that increasing Zn content leads to the increase of the intergranular phases and the change of their composition from Mg24(Gd,Y)5 phase and(Mg,Zn)3(Gd,Y) phase to 18 R-LPSO phase and(Mg,Zn)3(Gd,Y) ***24(Gd,Y)5 phase is body-centered cubic structure and shares the same lattice constant with Mg24Y5 while(Mg,Zn)3(Gd,Y)phase is face-centered cubic structure with lattice constant of 0.72 nm,slightly lower than Mg3Gd.18RLPSO structure is identified to be monoclinic with c-axis not strictly vertical to the bottom surface but93.5°.The growth patterns of intergranular phases change from the divorced growth to coupled growth as compositions ***,the mechanical performance improves with Zn rising,ascribed to the decrease of brittle phases at grain boundaries and the increase of LPSO structure phases.

关键词： Mg-Gd-Y-Zn alloy Long period stacking ordered(LPSO) Phase growth Mechanical properties Rare earths

growth and characterization of urea-(d) tartaric acid single crystal

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Chinese Science Bulletin 1996年第16期41卷 1392-1395页

作者：吕孟凯孟凡青曾红于文涛 National Key Laboratory of Crystal Materials Shandong University. Jinan 250100 China

In recent years, organic NLO materials have always attracted people’s attention, especially the conjugated-π organic compounds with substitutes of electronic donor and acceptor, for example, (3-methyl-4-nitroaniline) (MNA), N-(4-nitrophenyl-(s)-prolinol (NPP), ((2, 4-dinitrophenyl)-amino-2-propanoate) (MAP), etc. Being made of delocalized

关键词： urea-(d) tartaric acid crystal growth structure of crystal infrared spectra

Enhanced removal of I^- on hierarchically structured layered double hydroxides by in suit growth of Cu/Cu2O

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Journal of Environmental Sciences 2020年第2期32卷 338-348页

作者： Jiuyu Chen Junyi Wang Qianhong Gao Xiaomei Zhang Ying Liu Peng Wang Yan Jiao Zongxiang Zhang Yi Yang Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse School of Environmental and Biological EngineeringNanjing University of Science and TechnologyNanjing 210094China Collaborative Innovation Center of Atmospheric Environment and Equipment Technology Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control(AEMPC)Nanjing University of Information Science&TechnologyNanjing 210044China Jiangsu Environmental Protection Key Laboratory of Monitoring for Organic Pollutants in Soil Taizhou Environmental Monitoring CenterTaizhou 225300China

To further improve the removal ability of layered double hydroxide(LDH) for iodide(I^-) anions from wastewater, we prepared hierarchically porous Cu5Mg10Al5-LDH and used as a matrix for in suit growth of Cu/Cu2O on its surface, forming Cu/Cu2O-LDH, which was characterized and applied as an *** displayed high I^-saturation uptake capability(137.8 mg/g) of Cu/Cu2O-LDH compared with Cu5Mg10Al5-LDH(26.4 mg/g) even thermal activated LDH(76.1 mg/g).Thermodynamic analysis showed that the reaction between I^-anions and Cu/Cu2O-LDH is a spontaneous and *** kinetics analysis exhibited that adsorption equilibrium can be reached after 265 ***, the adsorbent showed satisfactory selectivity in the presence of competitive anions(e.g., SO4^2-), and could achieve good adsorption performance in a wide pH range of 3–8.A cooperative adsorption mechanism was proposed on the basis of the following two aspects:(1) ion exchange between iodide and interlayer anions;(2) the adsorption performance of Cu, Cu(Ⅱ) and Cu2O for I^-.Meanwhile, the difference between the adsorption mechanism of Cu/Cu2O-LDH, Cu5Mg10Al5-LDH and Cu5Mg10Al5-CLDH adsorbents was also elaborated and verified.

关键词： Layered double hydroxide Cu/Cu2O Iodide adsorption Hierarchical structure In suit growth

Comparative Investigation on Step-cycle Tensile Behaviors of Two Bimodal Pipe-grade Polyethylene with Different Slow Crack growth Resistance

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Chinese Journal of Polymer Science 2020年第6期38卷 611-619页

作者： Yan-Qin Huang Qing-Long Zhang Xiao-Ying Lu Yi-Bin Gong Hao Zhou Jia-Chun Feng StoteKey Laboratory of Molecular Engineering of Polymers Department of Macromolecular ScienceFudan UniversityShanghai200433China Laboratory for Synthetic Resin Research PetroChina Petrochemical Research InstituteBeijing W0083China Institute ofDushanzi Petrochemical Corporation PetroChina Company LimitedDushanzi 833699China

In this work,step-cycle tensile behavior of two bimodal polyethylene(PE)materials,a PEI 00 grade pipe material,XS10,and a PEI 00-RC(Resistant Crack)grade pipe material,XSC50,was comparatively *** decomposing the strain into a recoverable part and an unrecoverable part,it was found that the deformation recovery capability of XSC50 during stretching was larger than that of *** evolution characterized by in situ synchrotron small angle X-ray scattering indicated that the fragmentation of initial crystals in XSC50 occurred at lower strain than in *** that XSC50 had relatively small lamellar thickness and similar crystallinity to XS10,we speculated that the larger deformation recovery capability of XSC50 during stretching probably derived from stronger entangled amorphous region caused by larger density of tie molecules and entanglements,which were usually regarded to have a significant influence on the slow crack growth(SCG)resistance of PE *** expected,the experimental result of strain hardening modulus test suggested that the deformation recovery capability during stretching was positively correlated with the SCG resistance for XS10 and XSC50 used in this *** step-cycle tensile test had the potential to be developed into a supplement for comparison of SCG resistance of PE materials.

关键词： Polyethylene Step-cycle tensile test Deformation recovery Slow crack growth resistance

Carbon-nanoparticle-assisted growth of high quality bilayer WS2 by atmospheric pressure chemical vapor deposition

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Nano Research 2019年第11期12卷 2802-2807页

作者： Jieyuan Liang Lijie Zhang Xiaoxiao Li Baojun Pan Tingyan Luo Dayan Liu Chao Zou Nannan Liu Yue Hu Keqin Yang Shaoming Huang Key Laboratory of Carbon Materials of Zhejiang Province Institute of New Materials and Industrial TechnologiesCollege of Chemistry and Materials EngineeringWenzhou UniversityWenzhou325035China School of Materials and Energy Guangdong University of TechnologyGuangzhou510006China

Two-dimensional(2D)WS2 offers great prospects for assembling next-generation optoelectronic and electronic devices due to its thickness-dependent optical and electronic ***,layer-number-controlled growth of WS2 is still a challenge up to *** work presents controlled growth of bilayer WS2 triangular flakes by carbon-nanoparticle-assisted chemical vapor deposition(CVD)*** growth mechanism is also *** addition,the field effect transistors(FETs)based on monolayer and bilayer WS2 are also fabricated and *** bilayer FET displays a mobility of 34 cm2·V^-1·s^-1,much higher than that of the monolayer *** high figures of merit make bilayer WS2 a promising candidate in high-performance electronics and optoelectronics.

关键词： bilayer WS2 growth carbon nanoparticles chemical vapor deposition(CVD)

growth mechanism of reinforcements in in-situ synthesized (TiB+TiC)/Ti composites

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中国有色金属学会会刊：英文版 2001年第1期11卷 67-71页

作者：吕维洁张荻张小农郭淑玲吴人洁 State Key Laboratory of Metal Matrix Composites Shanghai Jiaotong University

The growth mechanism of reinforcement in in situ synthesized (TiB+TiC)/Ti composites was investigated. The results show that reinforcements nucleate and grow in a way of dissolution precipitation. The morphologies of reinforcements are closely related to the solidification paths and crystal structure of reinforcements. TiB, as a reinforcement, is liable to grow along [010] direction and forms in short fibre shape due to its B27 structure, whereas primary TiC is liable to form composition undercooling and grow in dendritic shape. TiC phases precipitated in binary eutectic and ternary eutectic reactions grow in equiaxial shape. The addition of aluminum element refines TiB and TiC particles, and makes TiC reinforcements grow into the equiaxial particles easily. The addition of graphite adjusts the solidification paths and forms more TiC with dendritic shape. [

关键词： TMCs in-situ reaction growth mechanism solidification path crystal structure

Effects of elevated ozone on growth and yield of field-grown rice in Yangtze River Delta,China

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Journal of Environmental Sciences 2008年第3期20卷 320-325页

作者： CHEN Zhan WANG Xiaoke FENG Zhaozhong ZHENG Feixiang DUAN Xiaonan YANG Wenrui Research Center for Eco-Environmental Sciences Chinese Academy of Scienees Beijing 100085 China

With rapid industrialization and urbanization in the Yangtze Delta, China, the tropospheric ozone concentration has increased to levels that induce crop yield loss. Rice, a widely grown crop in China, was investigated in field-established, open-top chambers. Four treatments were used： charcoal-filtered air （CF）, non-charcoal-filtered air （NF）, and charcoal-filtered air with two levels of additional ozone （O3-1 and O3-2）. The AOT40s （accumulated hourly mean ozone concentration above 40 ppbv） were 0, 0.91, 23.24, and 39.28 ppmv.h for treatment of CE NF, O3-1, and O3-2, respectively. The rice height and biomass were reduced in the elevated ozone concentration. Less organic matter partitioning to roots under the elevated ozone significantly decreased rice root activity. The yield loss was 14.3% and 20.2% under O3-1 and O3-2 exposure, respectively. This was largely caused by a reduction in grain weight per panicle.

关键词： ozone rice growth yield Yangtze Delta