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Variant selection, coarsening behavior of α phase and associated tensile properties in an α+β titanium alloy

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Journal of Materials Science & Technology 2022年第4期99卷 101-113页

作者： lei lei Qinyang Zhao Cong Wu Yongqing Zhao shixing Huang Weiju Jia Weidong Zeng State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China School of Material Science and Engineering Chang’an UniversityXi’an 710064China Northwest Institute for Nonferrous Metal Research Xi’an 710016China

Effect of cooling rates,i.e.,air cooling and furnace cooling,after solution in α+β phase-field on variant selection,coarsening behavior of α phase and microstructure evolution were investigated in α+β TC21 *** textures of primary α(α_(p))and lamellar α(α_(L))in β phase transformation microstructure(β_(t))were analysed separately,and the orientation relationship among α_(p),α_(L) and the parent β phase were *** addition,the influence of the microstructure characteristics on the tensile properties was *** results showed that all parent β grains,despite their different orientations,produced 12 ideal α_(L) variants with the same texture components and interweave to form a basketweave β_(t) structure under the air-cooling *** α_(p) without Burgers orientation relationship(BOR)with β phase exhibited obviously texture component without overlapping theαL texture *** volume fraction of α_(p) in the furnace-cooled sample(about 50%)was higher than that of the air-cooled sample(about 12%),while the size of it slightly increased with decreasing the cooling *** each β grain,the thick α_(L) in the same orientation formed anαcolony.A typical 3 variant colonies which were related to each other were ***,the α_(L) spatial orientation distribution showed more ***,the BOR between α_(p) and β and the same orientation of some α_(L) and the surrounding α_(p) grains resulting in the overlapping of α_(p) texture component and α_(L) texture *** last,the relationship between microstructure and tensile properties was analysed.

关键词： TC21 alloy Crystallographic orientation Texture Variant selection Tensile properties

Deformation mechanisms in aβ-quenched Ti-5321 alloy:In-situ investigation related to slip activity,orientation evolution and stress induced martensite

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Journal of Materials Science & Technology 2022年第17期112卷 36-48页

作者： Cong Wu Qinyang Zhao shixing Huang Yongqing Zhao lei lei Junqiang Ren Qiaoyan Sun Lian Zhou State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong UniversityXi’an 710049China School of Material Science and Engineering Chang'an UniversityXi’an 710064China Northwest Institute for Non-ferrous Metal Research Xi’an 710016China State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of TechnologyLanzhou 730050China

The deformation behavior ofβ-quenched nearβTi-5321(Ti-5Al-3Mo-3V-2Cr-2Zr-1Nb-1Fe)alloy was systematically studied using in-situ tensile test monitored by the scanning electron microscopy(SEM).Besides,the electron backscatter diffraction(EBSD)was performed to thoroughly discuss the deformation *** results indicated that slip activities,crystal rotation and stress induced martensite transformation were the major deformation mechanisms in theβ-quenched Ti-5321 alloy during in-situ tensile *** slip activities were investigated by using the EBSD-trace analysis,which demonstrated that{110},{112}and{123}slip systems were activated and the{110}slip system ***,βgrains rotated about 7.8°to accommodate the increased ***,the stress induced martensiteα″which was related to the double yielding behavior during tensile process exhibited multiple *** differentα″variants divided theβmatrix into smallerβblocks with a typical zigzag morphology,in which oneα″variant passed through another one by deflecting its initial growth ***,the deformation twinning in martensiteα″and slip bands cutting through martensiteα″effectively accommodated the local *** systematically analysis can provide insightful information about the deformation mechanisms in nearβtitanium alloys.

关键词： In-situ tensile test Slip activity Stress induced martensite Titanium alloys

New insights in the development ofαphase during continuously heating in aβ-quenched Ti-5321 alloy

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Journal of Materials Science & Technology 2022年第8期103卷 29-33页

作者： Cong Wu Qinyang Zhao shixing Huang Yongqing Zhao lei lei Qiaoyan Sun Lian Zhou State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’an 710049China Northwest Institute for Non-ferrous Metal Research Xi’an 710016China School of Material Science and Engineering Chang’an UniversityXi’an 710064China

Near β titanium alloys are attractive materials for aeronautical applications due to their high specific strength,excellent damage tolerance performance and good *** mechanical properties are strongly governed by the microstructural characteristics,especially the morphology,volume fraction,orientation and distribution of theαphase.

关键词： αphase alloy alloys

High drug loading hydrophobic cross-linked dextran microspheres as novel drug delivery systems for the treatment of osteoarthritis

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Asian Journal of Pharmaceutical Sciences 2023年第4期18卷 109-123页

作者： Zhimin Li Xianjing Feng shixing Luo Yanfeng Ding Zhi Zhang Yifeng Shang Doudou lei Jinhong Cai Jinmin Zhao Li Zheng Ming Gao Guangxi Engineering Center in Biomedical Materials for Tissue and Organ Regeneration The First Affiliated Hospital of Guangxi Medical UniversityNanning 530021China Collaborative Innovation Centre of Regenerative Medicine and Medical BioResource Development and Application Co-constructed by the Province and Ministry Guangxi Medical UniversityNanning 530021China Department of Spine and Osteopathic Surgery The First Affiliated Hospital of Guangxi Medical UniversityNanning 530021China Department of Orthopedics The Ninth Affiliated Hospital of Guangxi Medical UniversityBeihaiGuangxi 536000China Department of Orthopaedics Trauma and Hand Surgery The First Affiliated Hospital of Guangxi Medical UniversityNanning 530021China Guangxi Key Laboratory of Regenerative Medicine The First Affiliated Hospital of Guangxi Medical UniversityNanning 530021China

Drug delivery via intra-articular(IA)injection has proved to be effective in osteoarthritis(OA)therapy,limited by the drug efficiency and short retention time of the drug delivery systems(DDSs).Herein,a series of modified cross-linked dextran(Sephadex,S0)was fabricated by respectively grafting with linear alkyl chains,branched alkyl chains or aromatic chain,and acted as DDSs after ibuprofen(Ibu)loading for OA *** DDSs expressed sustained drug release,excellent anti-inflammatory and chondroprotective effects both in IL-1βinduced chondrocytes and OA ***,the introduction of a longer hydrophobic chain,particularly an aromatic chain,distinctly improved the hydrophobicity of S0,increased Ibu loading efficiency,and further led to significantly improving OA therapeutic ***,hydrophobic microspheres with greatly improved drug loading ratio and prolonged degradation rates show great potential to act as DDSs for OA therapy.

关键词： Sephadex microsphere Hydrophobic modification Drug delivery system High drug loading ratio Osteoarthritis

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数字信息资源统一共享模式探讨

中国图书馆学报 2005年第2期31卷 62-67页

作者：刘磊郭世星南京农业大学信息管理系教授硕士生导师博士江苏南京邮编 210095 南京农业大学信息管理系项士研究生

建立数字信息资源统一共享模式非常必要。数字信息资源统一共享模式,包括数字信息资源的生成标准模式、组织标准模式、存储标准模式、服务标准模式,以及建立统一的维护管理机构。每种模式都有其具体、深入的建设内容。图5。参考文献14。

关键词：数字信息资源共享模式网络环境信息生成信息组织信息存储信息服务

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分面元数据及其技术探讨

大学图书馆学报 2008年第3期26卷 23-27页

作者：郭世星刘磊南京农业大学南京210095

首先介绍了分面元数据的概念和国外的发展情况;然后介绍了与分面元数据相关的技术,如分面图(FACETMAP)、分面元数据的描述语言(XFML、DTD、RDF等)的发展情况;最后总结了分面元数据系统的两点共同特性:即搜索与浏览界面相结合,对图片检... 详细信息

首先介绍了分面元数据的概念和国外的发展情况;然后介绍了与分面元数据相关的技术,如分面图(FACETMAP)、分面元数据的描述语言(XFML、DTD、RDF等)的发展情况;最后总结了分面元数据系统的两点共同特性:即搜索与浏览界面相结合,对图片检索具有更好的效果。

关键词：分面元数据分面分类元数据分面图

CdGeAs2晶体的结构、弹性和电子性能的模拟计算和分析(英文)

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硅酸盐学报 2011年第2期39卷 349-354页

作者：朱崇强杨春晖马天慧夏士兴雷作涛哈尔滨工业大学化工学院哈尔滨150001

利用基于密度泛函理论的平面波赝势法对CdGeAs2晶体的结构,弹性和电子性能进行了研究。CdGeAs2晶体具有6个独立的弹性常数,利用计算的弹性性能可以判断晶体具有机械稳定性、延性和弹性各向异性等力学特点。通过总的和部分态密度分析了... 详细信息

利用基于密度泛函理论的平面波赝势法对CdGeAs2晶体的结构,弹性和电子性能进行了研究。CdGeAs2晶体具有6个独立的弹性常数,利用计算的弹性性能可以判断晶体具有机械稳定性、延性和弹性各向异性等力学特点。通过总的和部分态密度分析了不同能带的贡献成分。计算的结构参数及弹性常数与实验值基本吻合。CdGeAs2晶体具有直接能隙,禁带宽为0.05 eV,并且具有共价特性。此外,通过电子等密度线以及Mulliken键布局表明,Cd–As键的共价性要强于Ge–As键的。

关键词：砷化锗镉晶体密度泛函理论弹性性能电子性能

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某大跨度挑台舒适度分析及振动控制

建筑结构 2021年第22期51卷 84-89页

作者：杨姝姮赵仕兴周磊四川省建筑设计研究院有限公司成都610017 四川省建筑设计研究院有限公司复杂结构设计研究中心成都610017

某景观挑台采用大跨度柔性悬挑钢结构,挑出长度约27m,在人行荷载及山区复杂风场下易发生结构竖向振动。人行荷载作用下的舒适度分析结果表明,结构竖向振动加速度大于规范限值,不满足舒适度要求;采取TMD减振措施后,结构的加速度响应得到... 详细信息

某景观挑台采用大跨度柔性悬挑钢结构,挑出长度约27m,在人行荷载及山区复杂风场下易发生结构竖向振动。人行荷载作用下的舒适度分析结果表明,结构竖向振动加速度大于规范限值,不满足舒适度要求;采取TMD减振措施后,结构的加速度响应得到了有效控制。根据数值风洞模拟得到的体型系数及Python编程模拟的风荷载时程,采用时域分析法进行风振分析,结果表明,结构振动加速度满足舒适度要求,风荷载单独作用下无需额外采取结构减振措施。人群荷载及风荷载共同作用时结构的竖向振动加速度稳定值小于0.5m/s^(2),但加速度峰值大于两种荷载分别作用时的加速度峰值之和,因此人行荷载及风荷载对结构的影响不能简单叠加,必要时应进行两种荷载共同作用下的振动分析及减振控制。

关键词：大跨度悬挑钢结构人行荷载风振分析舒适度分析 TMD振动控制

商场促销方式对高校图书馆读者服务工作的启示

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大学图书馆学报 2007年第5期25卷 91-95页

作者：刘磊朱锁玲郭世星唐惠燕南京农业大学信息管理系南京210095

介绍了商场促销的主要手段,然后通过商场促销手段与高校图书馆读者服务工作之间的对比,选择了对高校图书馆读者服务工作有借鉴作用的商场促销方式,分析其应用在图书馆读者服务工作中的方式和作用,希望对目前高校图书馆的读者服务工作带... 详细信息

介绍了商场促销的主要手段,然后通过商场促销手段与高校图书馆读者服务工作之间的对比,选择了对高校图书馆读者服务工作有借鉴作用的商场促销方式,分析其应用在图书馆读者服务工作中的方式和作用,希望对目前高校图书馆的读者服务工作带来一定的变革,使图书馆读者服务工作更加人性化、更具主动性。

关键词：商场商品促销高校图书馆读者服务