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Dynamic recrystallization behavior and strengthening mechanism of a novel Mo-Ti_(3)AlC_(2) alloy at ultrahigh temperature

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Rare Metals 2024年第8期43卷 3946-3960页

作者： Lu Yang Xin-Yuan Zheng Yang Zhao Xi-Ran Wang Fang-Nao Xiao shi-zhong wei School of Materials Science and Engineering Henan University of Science and TechnologyLuoyang 471023China National Joint Engineering Research Center for Abrasion Control and Molding of Metal Materials Henan University of Science and TechnologyLuoyang 471003China Department of Applied Mechanics Univ.Bourgogne FrancheComteFEMTO-ST InstituteCNRS/UF/ENSMM/UTBM25000BesangonFrance

Increasing the recrystallization temperature to achieve better high-temperature performance is critical in the development of molybdenum alloys for ultrahightemperature applications,such as the newest generation of multitype high-temperature nuclear *** this study,an innovative strategy was proposed to improve the performance of molybdenum alloys at high temperature by using the two-dimensional MAX(where M is an early transition metal,A is an A-group element and X is C or N)ceramic material Ti_(3)AlC_(2).The relationships between flow stress,strain rate and temperature were *** microstructure,distribution of misorientation and evolution of dislocations in the Mo-Ti_(3)AlC_(2) alloy were *** microscopic mechanism of the Ti_(3)AlC_(2) phase in the molybdenum alloy at high temperatures was *** experimental results showed that the peak flow stress of Mo-Ti_(3)AlC_(2) at 1600℃ reached 155 MPa,which was161.8% greater than that of pure *** activation energy of thermal deformation of Mo-Ti_(3)AlC_(2) was as large as537 kJ·mol~(-1),which was 17.6% more than that of pure *** recrystallization temperature reached 1600℃ or even *** topological reaction of the Ti_(3)AlC_(2) phase consumed a large amount of energy at high temperatures,resulting in increases in the deformation activation *** structures of AlTi_3 and Ti-O Magneli-phase oxides(Ti_nO_(2n-1)) were formed in-situ,which relied on kink bands and interlayer slip,resulting in many dislocations during ***,the special two-dimensional of the structure Ti_(3)AlC_(2) ceramic inhibited the recrystallization behavior of the Mo *** results of this study can provide theoretical guidance for the development of a new generation of molybdenum alloys for use in ultrahigh-temperature environments.

关键词： Mo alloy Two-dimensional reinforcement Dynamic recrystallization behavior Hot deformation Mechanical properties

桂花OfLCYB提高转基因烟草类胡萝卜素含量和低温胁迫的抗性

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农业生物技术学报 2025年第1期33卷 1-14页

作者：彭琳王艺光董彬钟诗蔚方遒肖政邓金萍赵宏波浙江农林大学风景园林与建筑学院/浙江省园林植物种质创新与利用重点实验室/南方园林植物种质创新与利用国家林业和草原局重点实验室

番茄红素β-环化酶(lycopene β-cyclase, LCYB)是类胡萝卜素生物合成途径中的关键酶。桂花(Osmanthus fragrans)主要分布于我国南方。在深秋和冬季开放的桂花遇低温天气会出现颜色加深的现象。本研究通过相对低温处理桂花，发现桂花花... 详细信息

番茄红素β-环化酶(lycopene β-cyclase, LCYB)是类胡萝卜素生物合成途径中的关键酶。桂花(Osmanthus fragrans)主要分布于我国南方。在深秋和冬季开放的桂花遇低温天气会出现颜色加深的现象。本研究通过相对低温处理桂花，发现桂花花瓣颜色变深、类胡萝卜素含量显著增加、关键合成基因OfLCYB上调表达。为研究OfLCYB对类胡萝卜积累和低温胁迫的响应机制，本研究从桂花花瓣中克隆了OfLCYB基因(GenBank No. PP438593)，并构建过表达载体转化烟草(Nicotiana tabacum)。结果显示，过表达OfLCYB可以促进转基因烟草叶片中类胡萝卜素的积累和参与类胡萝卜素生物合成途径中相关基因的表达。低温(4℃)处理烟草之后，与对照植株相比，OfLCYB过表达的烟草叶片表现出更好的低温耐受性。在低温处理下，转基因株系叶片中相对电解质泄露率(relative electrolyte leakage, REL)和丙二醛(malondialdehyde, MDA)含量显著低于对照植株，超氧化物歧化酶(superoxide dismutase, SOD)活性、过氧化物酶(peroxidase, POD)活性、过氧化氢酶(catalase, CAT)活性和脯氨酸含量显著提高。此外，与对照植株相比，转基因烟草叶片中的2个冷应答转录因子NtDREB1(dehydration responsive element binding 1)和NtDREB3及2个冷诱导基因NtERD10A(early responsive to dehydration 10A)和NtERD10B的表达水平上调。推测OfLCYB可能通过促进类胡萝卜素合成提高植物的低温耐受性。本研究可为提高桂花耐寒性和扩大栽培范围提供参考。

关键词：桂花番茄红素β-环化酶(LCYB) 类胡萝卜素低温抗性

Design and application of copper/lithium composite anodes for advanced lithium metal batteries

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Rare Metals 2024年第3期43卷 942-970页

作者： Bin Zhang Ji-Ping Ma Yang Zhao Tong Li Jin-Lin Yang Zhan-Ling Zhang shi-zhong wei Guang-Min Zhou School of Materials Science and Engineering Henan University of Science and TechnologyLuoyang 471003China Shenzhen Geim Graphene Center Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055China School of Physical and Mathematical Sciences Nanyang Technological UniversitySingapore 637371Singapore Shenzhen Geim Graphene Center Tsinghua-Berkeley Shenzhen InstituteTsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055China

Lithium(Li)is a promising candidate for nextgeneration battery anode due to its high theoretical specific capacity and low reduction ***,safety issues derived from the uncontrolled growth of Li dendrite and huge volume change of Li hinder its practical application.C onstructing dendrite-free composite Li anodes can significantly alleviate the above ***(Cu)-based materials have bee n widely used as substrates of the composite electrodes due to their chemical stability,excellent conductivity,and good mechanical ***/lithium(Cu/Li)composite anodes significantly regulate the local current density and decrease Li nucleation overp otential,realizing the uniform and dendrite-free Li *** this review,Cu/Li composite methods including electrodeposition,melting infusion,and mechanical rolling are systematically summarized and ***,design strategies of Cu-based current collectors for high performance Cu/Li composite anodes are *** challenges and future development for Cu/Li composite anodes are presented and *** hope that this review can provide a comprehensive understanding of Cu/Li composite methods of the latest development of Li metal anode and stimulate more research in the future.

关键词： Lithium metal batteries Cu/Li composite anode Electrodeposition Thermal melting infusion Mechanical rolling

Properties and microstructure of oxide dispersion strengthened tungsten alloy prepared by liquid-phase method:a review

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Tungsten 2023年第4期5卷 481-502页

作者： Liu-Jie Xu Zhou Li Fang-Nao Xiao Yun-Chao Zhao Yu-Cheng Zhou shi-zhong wei National Joint Engineering Research Center for Abrasion Control and Molding of Metal Materials Henan University of Science and TechnologyLuoyang471003China Henan Key Laboratory of High-temperature Structural and Functional Materials Henan University of Science and TechnologyLuoyang471003China College of Material Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing201116China

The addition of the second phase into tungsten can significantly refine the grain size of tungsten alloys,and also play a role in dispersion strengthening,thus improving the properties of tungsten *** a preparation method of tungsten alloy powder,liquid-phase method avoids the disadvantage of mechanical alloying,and the obtained powder composition is accurate and controllable,with high purity and excellent *** present,the second phase particles used for dispersion strengthening tungsten alloys are mainly composed of *** particles can be synthesized and precipitated in nitrate solution through in situ chemical reaction,and are uniformly distributed in composite powder by mixing and ***,the oxide dispersion strengthened tungsten alloy(ODS-W)was obtained by reduction and ***-phase methods for preparing ODS-W alloys include azeotropic distillation,sol-gel methods,freeze-drying,hydrothermal synthesis,spray-drying,*** this paper,several liquid-phase methods for preparing tungsten alloy composite powder precursors are reviewed,and their latest research progresses are *** addition,the morphologies and properties of tungsten alloys prepared by different methods are compared,which provides guidance for preparing high-performance tungsten alloys.

关键词： Tungsten alloy ODS-W Liquid-phase method Microstructure Property

Improved material descriptors for bulk modulus in intermetallic compounds via machine learning

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Rare Metals 2023年第7期42卷 2396-2405页

作者： De-Xin Zhu Kun-Ming Pan Yuan Wu Xiao-Ye Zhou Xiang-Yue Li Yong-Peng Ren Sai-Ru shi Hua Yu shi-zhong wei Hong-Hui Wu Xu-Sheng Yang National Joint Engineering Research Center for Abrasion Control and Molding of Metal Materials Henan Key Laboratory of High-Temperature Structural and Functional MaterialsHenan University of Science and TechnologyLuoyang471003China Longmen Laboratory Luoyang471003China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing100083China Guangdong Province Key Laboratory of Durability for Marine Civil Engineering School of Civil EngineeringShenzhen UniversityShenzhen518060China Department of Industrial and Systems Engineering The Hong Kong Polytechnic UniversityHong Kong999077China

Bulk modulus is an important mechanical property in the optimal design and selection of intermetallic *** this study,bulk modulus datasets of intermetallic compounds were collected,and the features affecting the bulk modulus of intermetallics were screened via feature *** features B_(cal),dB_(avg),and TIE(corresponding to calculated bulk modulus,mean bulk modulus,and third ionization energy,respectively)were found to be the dominant factors influencing bulk modulus and can be extended to other multi-component ***,we predicted the bulk modulus with an accuracy of 95%using surrogate machine learning models with the selected features,and these features were also demonstrated to be effective for high-entropy ***,symbolic regression provided an expression for the relationship between bulk modulus and the screened *** machine learning models provide a new approach for optimizing and predicting the bulk moduli of intermetallic compounds.

关键词： Bulk modulus Intermetallic compounds Machine learning Symbolic regression

2019 Chinese expert consensus statement on aspirin application in primary prevention of cardiovascular disease

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Chinese Medical Journal 2020年第10期133卷 1221-1223页

作者： Xiao-Ying Li zhong-wei shi Dong Zhao Da-wei Yin Chinese People's Liberation Army General Hospital Beijing 100853 the writing group of 2019 Chinese expert consensus statement on aspirin application in primary prevention of cardiovascular disease

Aspirin has been widely used in primary prevention of atherosclerotic cardiovascular disease(ASCVD)J141 Aspirin for primary prevention of ASCVD does not significantly reduce all-cause mortality or cardiovascular mortality,and the main benefit of aspirin for primary prevention of ASCVD is a significant reduction in non-fatal ischemic events including myocardial infarction,transient ischemic attack,ischemic stroke,and major cardiovascular events(cardiovascular death,non-fatal myocardial infarction,and non-fatal stroke),whereas the main risk is a significant increase in non-fatal major bleeding events including gastrointestinal bleeding and intracranial hemorrhage.1 Obviously,it makes sense to prescribe aspirin for primary prevention only if the benefits clearly outweigh the *** Europe and the United States,the benefit-risk ratio of aspirin for primary prevention has gradually decreased compared to the past due to the wide application of other primary prevention measures such as blood pressure reduction,smoking cessation,and the use of *** recent large-scale clinical trials have shown that aspirin has no net clinical benefit when used in low-risk populations.19'1^Therefore,aspirin must be used with caution in the primary prevention of ASCVD.

关键词： prevention aspirin cardiovascular

Effect of Zr on microstructure and mechanical properties of 304 stainless steel joints brazed by Ag-Cu-Sn-In filler metal

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Journal of Iron and Steel Research International 2024年第10期31卷 2448-2462页

作者： Ling-ling Huang Jian Qin Jun-lan Huang Hua Yu Chao Jiang Lu-yang Song Zhuo-li Yu Zhi-qian Liao Yan-zhao Cai Li Ma shi-zhong wei School of Materials Science and Engineering Henan University of Science and TechnologyLuoyang471000HenanChina National Joint Engineering Research Center for Abrasion Control and Molding of Metal Materials Henan University of Science and TechnologyLuoyang471000HenanChina State Key Laboratory of Advanced Brazing Filler Metals and Technology Zhengzhou Research Institute of Mechanical Engineering Co.Ltd.Zhengzhou450001HenanChina Luoyang ship Material Research Institute Luoyang471039HenanChina Avic Jonhon Optronic Technology Co. Ltd.Luoyang471039HenanChina

The effect of Zr on the microstructure and mechanical properties of 304 stainless steel joints brazed with Ag-Cu fillers was *** incorporation of Zr had little effect on the solid-liquid phase line of the fillers,and the melting temperature range of the fillers was narrowed,which enhanced their fluidity and *** presence of Zr in the form of heterogeneous particles augmented the nucleation rate during solidification,transforming the intermittently distributed gray-black coarse dendrites into cellular *** structural transformation led to fragmentation and refinement of the *** dissolution of Zr into Ag and Cu promoted the transformation of low-angle grain boundaries to high-angle grain boundaries(HAGBs),hindering crack *** element in the brazing seam led to grain refinement and increased density of grain *** grain refinement could disperse the stress,and HAGBs could resist the dislocation movement,improving the joint *** results display that when Zr content was 0.75 wt.%,the maximum strength was 221.1 *** fracture occurred primarily at the brazing seam,exhibiting a ductile fracture.

关键词： Active element Ag-Cu filler Stainless steel Brazing Mechanical property