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Microstructure and strengthening mechanism of hot-extruded ultralight Mg-Li-Al-Sn alloys with high strength

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Journal of Materials Science & Technology 2022年第8期103卷 186-196页

作者： Gang Zhou Yan Yang Hanzhu zhang Faping Hu xueping zhang Chen Wen Weidong Xie Bin Jiang Xiaodong Peng Fusheng Pan International Joint Laboratory for Light Alloys(MOE) College of Materials Science and EngineeringChongqing UniversityChongqing 400044China National Engineering Research Center for Magnesium Alloys Chongqing UniversityChongqing 400044China State Key Laboratory of Mechanical Transmissions College of Materials Science and EngineeringChongqing UniversityChongqing 400044China Beijing Spacecrafts Beijing 100090China

Duplex-structured Mg-7Li-2Al-1.5Sn alloys with high strength were fabricated and their strengthening mechanism was *** Mg-7Li-2Al-1.5Sn alloys were prepared by casting and extruded at the temperature of 533 K with an extrusion ratio of 25:*** microstructure and mechanical properties of Mg-7Li-2Al-1.5Sn alloys were systematically investigated by OM,XRD,SEM,TEM,and tensile *** results show that Mg-7Li-2Al-1.5Sn alloys are mainly composed ofα-Mg,β-Li,LiMgAl_(2),Mg_(2)Sn and Li_(2)MgSn *** yield strength(YS),ultimate tensile strength(UTS)and elongation(EL)of the extruded alloy at room temperature reach 250 MPa,324 MPa and 11.9%,respectively.A lot of Sn-rich precipitates(Mg_(2)Sn and Li_(2)MgSn)are precipitated during extrusion with an average size of∼14 nm,which is beneficial to the grain *** recrystallization occurs during hot deformation and the nanoprecipitates effectively refine the dynamic recrystallized(DRXed)***,the residual dislocations existed in DRXed and un-DRXed grains result in the dislocation strengthening in the extruded ***7Li-2Al-1.5Sn alloys possess excellent high-temperature mechanical properties with the YS,UTS and EL of 200 MPa,237 MPa and 26.7%at 423 K,***-rich precipitates with good thermal stability can effectively prevent grain growth,which is good for the improvement of the high-temperature performance of Mg-Li-Al-Sn alloy.

关键词： Ultralight Mg-Li alloy Microstructure Mechanical properties Precipitation Strengthening mechanism

Oxygen vacancy promising highly reversible phase transition in layered cathodes for sodium-ion batteries

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Nano Research 2021年第11期14卷 4100-4106页

作者： Kezhu Jiang Shaohua Guo Wei Kong Pang xueping zhang Tiancheng Fang Shao-fei Wang Fangwei Wang Xiaoyu zhang Ping He Haoshen Zhou Center of Energy Storage Materials&Technology College of Engineering and Applied SciencesNational Laboratory of Solid State MicrostructuresCollaborative Innovation Center of Advanced MicrostructuresJiangsu Key Laboratory of Artificial Functional MaterialsNanjing UniversityNanjing210093China Institute for Superconducting&Electronic Materials School of MechanicalMaterials and Mechatronics EngineeringUniversity of WollongongWollongongNSW2522Australia China Spallatoin Neutron Source Institute of High Energy PhysicsChinese Academy of SciencesDongguan523808China School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing101408China Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of SciencesBeijing100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing101408China Songshan Lake Materials Laboratory Dongguan523808China School of materials science and engineering Jiangsu UniversityZhenjiang212013China Energy Technology Research Institute National Institute of Advanced Industrial Science and Technology(AIST)Umezono 1-1-1Tsukuba305-8568Japan

Phase transition is common during (de)-intercalating layered sodium oxides, which directly affects the structural stability and electrochemical performance. However, the artificial control of phase transition to achieve advanced sodium-ion batteries is lacking, since the remarkably little is known about the influencing factor relative to the sliding process of transition-metal slabs upon sodium release and uptake of layered oxides. Herein, we for the first time demonstrate the manipulation of oxygen vacancy concentrations in multinary metallic oxides has a significant impact on the reversibility of phase transition, thereby determining the sodium storage performance of cathode materials. Results show that abundant oxygen vacancies intrigue the return of the already slide transition-metal slabs between O_(3) and P_(3) phase transition, in contrast to the few oxygen vacancies and resulted irreversibility. Additionally, the abundant oxygen vacancies enhance the electronic and ionic conductivity of the Na0.9Ni0.3Co0.15Mn0.05Ti0.5O2 electrode, delivering the high initial Coulombic efficiency of 97.1%, large reversible capacity of 112.7 mAh·g−1, superior rate capability upon 100 C and splendid cycling performance over 1,000 cycles. Our findings open up new horizons for artificially manipulating the structural evolution and electrochemical process of layered cathodes, and pave a way in designing advanced sodium-ion batteries.

关键词： sodium-ion battery layered oxide O_(3)phase oxygen vacancy reversible phase transition

Research Progress for the Development of Li-Air Batteries: Addressing Parasitic Reactions Arising from Air Composition

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Energy & Environmental Materials 2018年第2期1卷 61-74页

作者： xueping zhang Xiaowei Mu Sixie Yang Pengfei Wang Shaohua Guo Min Han Ping He Haoshen Zhou Center of Energy Storage Materials&Technology College of Engineering and Applied SciencesNational Laboratory of Solid State MicrostructuresCollaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China Energy Technology Research Institute National Institute of Advanced Industrial Science and Technology(AIST)Umezono 1-1-1Tsukuba 3058568Japan

Li-air batteries are an extremely attractive technology for electrical energy storage,especially in long-range electric vehicles,owing to their high theoretical specific ***,many issues still exist before their practical ***,the sole complexity of electrode reaction in Li-air batteries is *** the critical components that influence the electrochemical performance of aprotic Li-air batteries operating in ambient air are *** include the mechanisms and pathways of CO_(2)/Li_(2)CO_(3) and H_(2)O/LiOH,catalysts of CO_(2) reduction/evolution reactions,and reactions between the Li anode and air *** these challenges can be solved,Li-air batteries will soon be realized for practical *** hot topics in field of Li-air batteries should be focused,such as the fundamental mechanism research referring to interfacial reactions of atmosphere components on porous electrode and Li metal anode,high-efficiency solid catalyst design,and discovery of suitable soluble redox mediators.

关键词： electrode attractive realization

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实践及其职责

四川大学学报（哲学社会科学版） 2008年第5期 53-57页

作者：王万民张雪萍四川师范大学政治教育学院四川成都610066

实践是人能动地改造物质世界的对象性活动,在本质上是人类追求真理和实现价值的活动和过程。人类存在的前提是实践,实践是人的"类"标记,人的社会性实质上是实践性,因此实践是人最基本的生存和发展方式。作为人的存在方式的实践的职责是... 详细信息

实践是人能动地改造物质世界的对象性活动,在本质上是人类追求真理和实现价值的活动和过程。人类存在的前提是实践,实践是人的"类"标记,人的社会性实质上是实践性,因此实践是人最基本的生存和发展方式。作为人的存在方式的实践的职责是:认识世界、解释世界、规范世界和改造世界。

关键词：实践人的存在方式实践职责

A high efficiency electrolyte enables robust inorganic–organic solid electrolyte interfaces for fast Li metal anode

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Science Bulletin 2021年第9期66卷 897-903,M0004页

作者： Feilong Qiu Siyun Ren xueping zhang Ping He Haoshen Zhou Center of Energy Storage Materials&Technology College of Engineering and Applied SciencesJiangsu Key Laboratory of Artificial Functional MaterialsNational Laboratory of Solid-State Microstructures and Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China Energy Technology Research Institute National Institute of Advanced Industrial Science and Technology(AIST)Tsukuba 3058568Japan

Developing a high-rate Li metal anode with superior reversibility is a prerequisite for fast-charging Li metal ***,the build-up of large concentration gradients under high current density leads to inhomogeneous Li deposition and unstable passivation layers of Li metal,resulting in lower Coulombic *** we report a concentrated dual-salts LiFSI-LiNO_(3)/DOL electrolyte to improve the high-rate performance of Li metal *** Li salts help passivate the fresh Li deposition ***,DOL contributes to the formation of flexible organic layers that can accommodate the rapid volume change of Li metal upon *** metal in the electrolyte remains stable over 240 cycles with the average Coulombic efficiency of 99.14%under a high current density of 8.0 mA cm^(-2).

关键词： Lithium metal anode Concentrated electrolyte Coulombic efficiency Edge effect

Superplastic deformation of commercial OOCr22Ni5Mo3N0.17 duplex stainless steel

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Journal of University of Science and Technology Beijing 2003年第2期10卷 49-55页

作者： Peixue zhang, xueping Ren, and Jianxin XieMaterials Science and Engineering School, University of Science and Technology Beijing, Beijing 100083, China

The superplastic behavior of a commercial duplex stainless steel has beenstudied by means of isothermal hot tensile test at temperatures of 850-1050 deg C for the initialstrain rates ranging from 3X10^(-4) s^(-1) to 5X10^(-2) s^(-1). At 960 deg C, the best superplasticdeformation that caused the maximum elongation greater than 840 percent was obtained for an initialstrain rate of 1.2X10^(-3) s^(-1). At 850 deg C, the best elongation 500 percent was achieved for aninitial strain rate of 2.5X10^(-3) s^(-1) During the deformation in higher temperature region,coarse gamma grains formed during the prior treatments were broken into spherical particles,resulting in a homogeneous dispersion of gamma particles within the delta-ferrite matrix. However,at lower temperatures between 800 and 950 deg C, the sigma phase was formed through the eutectoiddecomposition of delta->gamma+sigma, resulting finally in the stable equiaxed micro-duplexstructures with delta/gamma and gamma/sigma respectively. The precipitation of the sigma phaseplayed an important role in improving the superplasticity at 850 deg C. The strain-rate sensitivitycoefficient, m-values, were also determined by the strain rate change tests. The microstructurestudies show that the superplastic process occurs mainly by the local work hardening and thesubsequent dynamic recrystallization and a grain boundary sliding and grain switching mechanism.

关键词： duplex stainless steel superplasticity strain-rate sensitivitycoefficient isothermal hot tensile test

Colon cancer-associated transcript 1(CCAT1):A potential novel target in cancer therapy

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Chinese Medical Journal 2024年第17期137卷 2128-2130页

作者： Jinjie Ma Junpeng Pei xueping zhang Xiao Bai Siqi Ding Dongqiu Dai Department of Gastrointestinal Surgery The Fourth Affiliated Hospital of China Medical UniversityShenyangLiaoning 110032China Cancer Center The Fourth Affiliated Hospital of China Medical UniversityShenyangLiaoning 110032China

To the Editor:Long non-coding RNAs(lncRNAs)are a class of RNA molecules comprising more than 200 nucleotides in length,which possess negligible ability to encode functional *** are involved in several cell events,and their dysregulation has been reported to mediate tumor development and *** cancer-associated transcript 1(CCAT1)is consistently overexpressed in a range of cancer cells and *** treatment strategies that target CCAT1 have great potential.

关键词： CCAT1 Colon cancer

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非现实句和现实句的句法差异

语言教学与研究 2009年第6期 25-32页

作者：张雪平河南大学文学院语言科学与语言规划研究所 475001

"现实"和"非现实"是一对情态范畴。各种非现实句的非现实性强弱不同,形成了从认识层面到时间层面的一个连续统。非现实句和现实句是对立的两种句型,在句法上存在一系列差异,非现实性强的非现实句与现实句句法对立明显。本文从形式上证... 详细信息

"现实"和"非现实"是一对情态范畴。各种非现实句的非现实性强弱不同,形成了从认识层面到时间层面的一个连续统。非现实句和现实句是对立的两种句型,在句法上存在一系列差异,非现实性强的非现实句与现实句句法对立明显。本文从形式上证明了现代汉语非现实范畴是一种典型范畴,也是一种语义语法范畴。

关键词：非现实句现实句非现实范畴典型范畴语义语法范畴

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“一旦”与“万一”

世界汉语教学 2014年第2期28卷 212-221页

作者：张雪平河南大学文学院/语言科学与语言规划研究所

连词"一旦"和"万一"在语义、表达及分布等方面均有差异。"一旦"假设义范围宽,倾向于客观表达;"万一"假设义范围窄,偏向于主观上认为发生可能性极小的消极意义的事情的表达。"一旦"句的假设条件和结果之间的因果推断性强于"万一"句。"一... 详细信息

连词"一旦"和"万一"在语义、表达及分布等方面均有差异。"一旦"假设义范围宽,倾向于客观表达;"万一"假设义范围窄,偏向于主观上认为发生可能性极小的消极意义的事情的表达。"一旦"句的假设条件和结果之间的因果推断性强于"万一"句。"一旦"与"万一"的语义和表达特点与其语用分布密切相关:"一旦"句基本上是肯定陈述句,"万一"句则较多为否定式、疑问句、祈使句和感叹句。决定二者语义、表达、分布及句式义差异的内在原因是其词义基础及语法化程度的不同。

关键词： “一旦”“万一”假设义表达特点语用分布