检索结果-南通市图书馆

Influence of Fe-rich phases and precipitates on the mechanical behaviour of Al-Cu-Mn-Fe-Sc-Zr alloys studied by synchrotron X-ray and neutron

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2023年第27期158卷 226-241页

作者： Yuliang Zhao Dongfu Song Shengchuan Wu Shunfu Xie Haoliang Wang Mengmeng Wang weiwen zhang Zhenzhong Sun Yubin Ke Shanfeng Wang Wanxia Huang Ricardo Fernández Neutron Scattering Technical Engineering Research Centre School of Mechanical EngineeringDongguan University of TechnologyDongguan 523808China Centro Nacional de Investigaciones Metalúrgicas(CENIM) C.S.I.C.Avda.de Gregorio del Amo 8Madrid 28040Spain National Engineering Research Centre of Near-Net-Shape Forming for Metallic Materials South China University of TechnologyGuangzhou 510641China Institute of New Materials Guangdong Academy of ScienceGuangzhou 510650China State Key Laboratory of Traction Power Southwest Jiaotong UniversityChengdu 610031China Spallation Neutron Source Science Center Dongguan 523803China School of Materials Science and Engineering Anhui Polytechnic UniversityWuhu 241000China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100039China

A multiscale methodology using scanning and transmission electron microscope,synchrotron X-ray nano-tomography and micro-tomography,small angle neutron scattering,and in situ synchrotron X-ray diffrac-tion has been used,to reveal the effect of Fe-rich phases and precipitates on the mechanical behaviour of an Al-Cu-Mn-Fe-Sc-Zr ***α-Al grains size is reduced from 185.1μm(0 MPa)and 114.3μm(75 MPa)by applied ***,it has been demonstrated that suitable heat treatments modify the 3D morphology of Fe-rich phases from interconnected to a disaggregated structure that improves the mechanical properties of the *** size and morphology evolution of fine precipitates under differ-ent ageing temperature and time are *** ageing temperature of 160℃,the precipitates change from GP zones toθ’(around 75 nm in length)with ageing time increasing from 1 h to 24 h;the Vick-ers hardness increases from 72.0 HV to *** high ductility of the Sc,Zr modified Al-Cu alloy is related to the complex shape and the loss of interconnectivity of the Fe-rich particles due to the heat *** evolution of the crystal lattice strains inα-Al,andβ-Fe calculated during tensile test us-ing in-situ synchrotron X-ray diffraction corroborates the influence of the microstructure in the ductility of the modified alloy.

关键词： Al alloy Ageing process Mechanical properties In situ synchrotron X-ray Sc/Zr microalloying Fe-rich phase

Biosafety and biosecurity in the era of synthetic biology:Meeting the challenges in China and the U.S.

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Biosafety and Biosecurity 2019年第2期1卷 73-74页

作者： Thomas Inglesby Anita Cicero Caitlin Rivers weiwen zhang Johns Hopkins Center for Health Security BaltimoreMDUSA Tianjin University Centre for Biosafety Research&Strategy TianjinPR China

On July 26,2019,the workshop “Biosafety and Biosecurity in the Era of Synthetic Biology:Meeting the Challenges in China and the U.S.”,co-hosted by Johns Hopkins Center for Health Security and Tianjin University Centre for Biosafety Research&Strategy,was held in Washington,*** the United *** goal of this workshop was to bring technical and policy experts from China and the U.S.,as well as experts from Europe,together to develop a mutual understanding of each country’s current governance structures and to begin a dialogue on what is required to promote global biosafety and biosecurity.

关键词： Biosafety Biosecurity Synthetic Biology US China

网络化治理视角下的城市大脑——从效率导向到公共价值导向

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

学术前沿 2021年第9期 66-73页

作者：张蔚文浙江大学公共管理学院

数字信息技术的不断发展正在使城市社会空间形态发生深刻转变,而运用前沿技术推动城市管理手段、模式和理念创新是推进城市治理体系和治理能力现代化的必由之路。在城市数字治理中,发展多元主体共同参与的网络化治理,是实现城市善治的... 详细信息

数字信息技术的不断发展正在使城市社会空间形态发生深刻转变,而运用前沿技术推动城市管理手段、模式和理念创新是推进城市治理体系和治理能力现代化的必由之路。在城市数字治理中,发展多元主体共同参与的网络化治理,是实现城市善治的重要方式之一。在杭州城市大脑的建设过程中形成了包括企业参与服务机制、社会赋权与监督机制、非政府组织参与机制在内的城市治理网络化机制。当前,城市大脑建设仍面临"信息壁垒"难以突破、弱势政府带来治理秩序失范、行政力量过强抑制其他主体活力等问题。未来需明确公共价值导向的发展定位,以网络化治理为核心推动多方主体共同参与。

关键词：效率导向公共价值导向数字治理城市大脑

在线全文

学校读者我要写书评

暂无评论

邵雍的历史哲学思想探折

中国哲学史 2007年第3期 93-99页

作者：章伟文北京师范大学哲学与社会学学院价值与文化研究中心

邵雍的历史哲学不仅对历史发展规律等问题进行过思考,还对宇宙自然和人类社会历史发展之动力、历史发展的基本阶段和历史本体等问题进行了深入探讨。他认为太极"分阴分阳,迭用柔刚",其所涵阴阳刚柔的对立与分裂是宇宙自然和人类社会历... 详细信息

邵雍的历史哲学不仅对历史发展规律等问题进行过思考,还对宇宙自然和人类社会历史发展之动力、历史发展的基本阶段和历史本体等问题进行了深入探讨。他认为太极"分阴分阳,迭用柔刚",其所涵阴阳刚柔的对立与分裂是宇宙自然和人类社会历史发展的动力;"皇帝王伯"与"元会运世"是人类和宇宙历史发展的基本阶段;历史存在形上的理体,它"显诸仁"而"藏诸用",通过把握这个历史本体,人们就可以更深刻地认识并改变、创造自己的历史。

关键词：邵雍历史哲学历史发展动力历史发展阶段历史本体

在线全文

学校读者我要写书评

暂无评论

张伯端内丹学思想探微

中国哲学史 2009年第1期 87-94页

作者：章伟文北京师范大学哲学与社会学学院价值与文化研究中心

道教内丹学致力于为其宗教实践提供具体范式的指导,围绕着这个历史使命,内丹学对实证形上道体的方法、形上道体与形下经验世界的关系等诸多宗教哲学问题进行了思考。北宋张伯端及其内丹学思想是其中的杰出代表,他提出"大丹妙用法乾坤",... 详细信息

道教内丹学致力于为其宗教实践提供具体范式的指导,围绕着这个历史使命,内丹学对实证形上道体的方法、形上道体与形下经验世界的关系等诸多宗教哲学问题进行了思考。北宋张伯端及其内丹学思想是其中的杰出代表,他提出"大丹妙用法乾坤",认为宇宙生成的本原、轨则与丹道之理相契合;"逆行归元"是丹法的重要原理,人只要"返根复命"即可以"长存";又提出"先命后性"、"以命取性"的性命之学;而其宗教理想则重视"见末而悟本,舍妄以从真",以证得无上至真妙觉之道为目标。这些宗教哲理对宋以后道教内丹学的发展有着重要的启发和奠基作用。

关键词：张伯端内丹学真阴真阳逆行归元先命后性悟真

ReseaResearch on Characteristics of Heat Treatment of Squeeze Cast Al-Cu-Mg Alloy

在线全文

学校读者我要写书评

暂无评论

ReseaResearch on Characteristics of Heat Treatment of Squeez...

Influence of Extrusion Temperature on Microstructures and Properties of Cu-17Ni-3Al-X Alloy

中国材料大会2012

作者： Yaoqiang Gan Lei Lu Datong zhang weiwen zhang Yuanyuan Li National Engineering Research Center of Near-Net-Shape Forming for Metallic Materials South China University of Technology

A high strength Al-Cu-Mg alloy was prepared by squeeze *** effects of squeeze casting and heat treatment on the microstructures and mechanical properties of the alloy were *** was found that squeeze casting refined the microstructure and reduced the micro-segregation markedly,and also accelerated the diffusion process of solute atoms during solution heat *** strength and elongation of squeeze casting alloy were much higher than those of gravity casting alloy under both the as-cast and heat-treated *** addition,the Al-Cu-Mg alloy prepared by squeeze casting showed good natural aging response,and the naturally-aged alloy possessed a slightly lower tensile strength but better elongation compared to full artificial *** solution heat treatment at 495℃ for 9h and further natural aging for 48h or artificial aging at 190℃ for 6h,the tensile strength of squeeze casting alloy reached to 472MPa and 475MPa,respectively,and the elongation was 18.9% and 12.7% *** on the experimental results,the mechanism of microstructural evolution of squeeze casting Al-Cu-Mg alloy during heat treatment was discussed,and the effect of squeeze casting on the kinetics of solute diffusion and aging precipitation was studied.

关键词： Squeeze casting Heat treatment Al-Cu-Mg alloy Microstructures Mechanical properties.

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Influence of Extrusion Temperature on Microstructures and Pr...

钛合金三维点阵结构增韧纳米铝合金的力学性能和变形行为

中国材料大会2012

作者： Wei Tan Yuanhui Weng Zongqiang Luo weiwen zhang School of Mechanical ＆ Automotive Engineering South China University of Technology

ISBN: (纸本)9783037856093;3037856092

The microstructures and mechanical properties of the Cu-17Ni-3Al-X alloy extruded at different temperatures were investigated by hardness and tensile tests,optical microscope and scanning electronic *** experimental results showed that dynamic re-crystallization occured during the hot extrusion at 1000 ℃.The grain size of the extruded alloy was significantly refined and the mechanical properties increased remarkably compared to the as-cast *** alloy extruded at 1075 ℃ exhibited good mechanical properties with tensile strength of 994 MPa,Brinell hardness of 296 and elongation of 8.0%,which are 30%,9% and 285% higher than that of the as-cast alloy.

关键词： Cu-Ni alloy Extrusion temperature Mechanical property Microstructure.

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

金属学报 2024年第2期60卷 247-260页

作者：王勇张卫文杨超王智华南理工大学机械与汽车工程学院、广东省金属新材料制备与成形重点实验室广州510640 华南理工大学机械与汽车工程学院、国家金属材料近净成形工程技术研究中心广州510640

韧性差是限制高强度纳米结构铝合金应用的关键问题,本工作旨在结合增材制造点阵结构获得高强韧性。利用增材制造和热挤压制备出TC4三维点阵结构增韧Al_(84)Ni_(7)Gd_(6)Co_(3)纳米结构铝合金的新型复合材料,并对其微观组织、拉伸力学性... 详细信息

韧性差是限制高强度纳米结构铝合金应用的关键问题,本工作旨在结合增材制造点阵结构获得高强韧性。利用增材制造和热挤压制备出TC4三维点阵结构增韧Al_(84)Ni_(7)Gd_(6)Co_(3)纳米结构铝合金的新型复合材料,并对其微观组织、拉伸力学性能和拉伸断裂行为进行了表征和分析。结果表明,复合材料中TC4点阵结构保持完整,界面保持平直清晰,TC4合金中的α相和β相沿着挤压方向拉长形成精细的片条状结构,纳米结构铝合金区域为高体积分数纳米结构化合物相和纳米晶Al。力学性能测试结果表明,TC4三维点阵结构对纳米结构铝合金区域的裂纹萌生和扩展产生了明显的限制效应,使得复合材料获得了良好的拉伸力学性能。

关键词：铝合金钛合金点阵结构复合材料强韧性

Representation and competition in the perception of spoken words

在线全文

学校读者我要写书评

暂无评论

Representation and competition in the perception of spoken w...