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Achieving exceptionally high strength and rapid degradation rate of Mg-Er-Ni alloy by strengthening with lamellar γ' and bulk LPSO phases

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Journal of materials Science & Technology 2024年第1期168卷 88-102页

作者： Chaoneng Dai Jingfeng Wang Yuanlang Pan Kai ma Yinhong Peng Ye Wang Danqian Wang Chunhua Ran Jinxing Wang yanlong ma College of Chemistry and Chemical Engineering Chongqing UniversityChongqing 401331China College of materials Science and Engineering Chongqing UniversityChongqing 400044China National Engineering Research Center for magnesium Alloys Chongqing 400044China College of materials Science and Engineering Chongqing University of TechnologyChongqing 400054China

As-extruded Mg-Er-Ni alloys with different volume fractions of long-period stacking ordered(LPSO)phase and density of lamellar γ' phase were prepared,and the microstructure,mechanical,and degradation properties were investigated.Coupling the bulk LPSO phase and the lamellar γ' phase,and controlling the dynamic recrystallization processes during deformation by adjusting the volume fraction of LPSO and the density of the γ' phase,a synergistic increase in strength and degradation rate can be achieved.On the one hand,the increase in corrosion rate was related to the increased volume fraction of the bulk LPSO phase and the densities of the lamellar γ' phase,which provide more galvanic corrosion.Moreover,high densities of the lamellar γ' phase can provide more corrosion interface by inhibiting the recrystallization process to refine dynamic recrystallized(DRXed)grains during the hot extrusion.On the other hand,the ultimate tensile strength(UTS)and tensile yield strength(TYS)of the Mg-Er-Ni alloy increased from 345 and 265 MPa to 514 MPa and 358 MPa,respectively,which was mainly attributed to grain boundary and texture strengthening,bulk LPSO phase and lamellar γ' phase strengthening.Overall,Mg^(-1)4Er-4Ni alloy,which contains the highest volume fraction bulk LPSO phase and the densities of lamellar γ' phase,re-alized a synergistic enhancement of strength and degradation rate.The UTS,TYS,and degradation rate of Mg^(-1)4Er-4Ni were 514 MPa,358 MPa,and 142.5 mg cm^(-2)h^(-1)(3 wt%KCl solution at 93◦C),respectively.This research provides new insight into developing Mg alloys with high strength and degradation rates for fracturing tool materials in the application of oil and gas exploitation in harsh environments.

关键词： Mg-Er-Ni alloy Lamellarγ'and bulk LPSO phases Rapid degradation rate High strength Mechanical and corrosion mechanism

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Interfacial Reaction of Ti6Al4V Lattice Structure-Reinforced VW92 Alloy matrix Composites

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Acta Metallurgica Sinica(English Letters) 2024年第3期37卷 570-576页

作者： Haijun Wang Renju Cheng Xianhua Chen Mingbo Yang Daiyi Deng Lirui Liu Yongfeng Zhou yanlong ma Kaihong Zheng Fusheng Pan College of materials Science and Engineering Chongqing University of TechnologyChongqing 400054China College of materials Science and Engineering Chongqing UniversityChongqing 400044China Institute of New materials Guangdong Academy of SciencesGuangzhou 510650China

A novel melting infiltration by ultrasonic vibration was investigated and applied to fabricate Ti6Al4V(TC4)lattice structure-reinforced Mg-10Gd-2Y-1Zn-xZr(refer to VW92 hereafter,x=0,0.5 wt%)alloy matrix composites.The edge-to-edge matching model indicates that the well-matching and possible orientation relationships(ORs)between theα-Mg andα-Ti,[10-10]_(α-Mg)//[11-23]_(α-Ti) in(0002)_(α-Mg)//(10-10)_(α-Ti) possesses the smallest misfit of 0.4%(f_(r)),and thus theα-Mg grains can nucleate on the TC4 lattice structure.Interfacial reaction occurred in the TC4/VW92+0.5 wt%Zr composites,and the reaction product was confirmed to be Al_(2)Zr_(3),AlZr_(2) andα-Ti(Zr)particles formed by continuous solution of Zr-Ti.Among the interfacial products,the AlZr_(2) phase is a brittle phase with high-volume fraction,which is not conducive to the load transfer.But generally speaking,theα-Ti(Zr)and theα-Mg tend to form a coherent interface,which is beneficial for improving the interfacial bonding strength of composites.

关键词： TC4 VW92 composites TC4 lattice structure Interfacial reaction Mismatch

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A Hybrid Music Recommendation Model Based on Personalized Measurement and Game Theory

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Chinese Journal of Electronics 2023年第6期32卷 1319-1328页

作者： WU Yun LIN Jian ma yanlong The State Key Laboratory of Public Big Data Guizhou University College of Computer Science and Technology Guizhou University

Music recommendation algorithms, from the perspective of real-time, can be classified into two categories: offline recommendation algorithms and online recommendation algorithms. To improve music recommendation accuracy, especially for the new music(users have no historic listening records on it), and real-time recommendation ability, and solve the interest drift problem simultaneously, we propose a hybrid music recommendation model based on personalized measurement and game theory. This model can be separated into two parts: an offline recommendation part(OFFLRP) and an online recommendation part(ONLRP). In the offline part, we emphasize users personalization. We introduce two metrics named user pursue-novelty degree(UPND) and music popularity(MP) to improve the traditional items-based collaborative filtering algorithm. In the online part, we try to solve the interest drift problem, which is a thorny problem in the offline part. We propose a novel online recommendation algorithm based on game theory. Experiments verify that the hybrid music recommendation model has higher new music recommendation accuracy, decent dynamical personalized recommendation ability, and real-time recommendation capability, and can substantially mitigate the problem of interest drift.

关键词： Music recommendation Personalization Game theory Interest drift Hybrid music recommendation model

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黑土区不同纬度农田和人工林生境地表节肢动物群落分布特征

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生态学杂志 2024年第2期43卷 494-504页

作者：刘洁马艳龙洛阳师范学院地理与旅游学院河南洛阳471934

沿纬度梯度分别在长春、哈尔滨、绥化设置样地,通过陷阱法调查不同纬度农田和人工林地表节肢动物的群落组成和多样性特征,探讨地表节肢动物群落和环境因子的相互关系。本次调查共捕获地表节肢动物15001只,隶属于节肢动物门4纲8目44科83... 详细信息

沿纬度梯度分别在长春、哈尔滨、绥化设置样地,通过陷阱法调查不同纬度农田和人工林地表节肢动物的群落组成和多样性特征,探讨地表节肢动物群落和环境因子的相互关系。本次调查共捕获地表节肢动物15001只,隶属于节肢动物门4纲8目44科83种。纬度梯度上,农田地表节肢动物个体数、人工林地表节肢动物物种数从低纬度向高纬度逐渐减少,且各纬度农田地表节肢动物个体数显著高于人工林,人工林物种数高于农田。多样性特征上,3个纬度中,人工林地表节肢动物的Shannon多样性指数、Pielou均匀度指数和margalef丰富度指数均高于农田,而农田的Simpson优势度指数要高于人工林;农田地表节肢动物多样性从低纬度到高纬度逐渐增大、优势度逐渐减少;人工林中,长春样地多样性指数最高,优势度较低,哈尔滨样地优势度指数较高,多样性指数最低,绥化样地居中。双变量相关分析表明,土壤pH值、全氮、有机质、含水量以及气温因子在哈尔滨农田样地中与地表节肢动物个体数呈显著相关性(P<0.05),且含水量对地表节肢动物个体数量解释程度最大,其他样地中,地表节肢动物个体数量受环境因子的影响相对较小;冗余分析结果与双变量相关分析结果较一致,各样地中优势类群对环境因子有较强适应能力,广泛分布在各研究样地内,但环境因子对地表节肢动物个体数影响随纬度变化未呈现明显规律性。本研究为黑土区农田和森林土壤动物空间格局和生态系统稳定性研究奠定基础。

关键词：地表节肢动物群落结构多样性纬度梯度

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探索物联网架构的区块链与人工智能应用

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中国科技纵横 2024年第4期 20-22页

作者：马延龙启迪城服(杭州)环境科技有限公司浙江杭州 310000

随着科学技术的不断进步,区块链技术与人工智能技术取得了一定成就,全新技术的应用带动了物联网行业的发展.在探索物联网架构中,区块链与人工智能技术应发挥自身优势,推动其顺利运行.基于此,本文通过探索物联网架构的区块链与人工智能... 详细信息

随着科学技术的不断进步,区块链技术与人工智能技术取得了一定成就,全新技术的应用带动了物联网行业的发展.在探索物联网架构中,区块链与人工智能技术应发挥自身优势,推动其顺利运行.基于此,本文通过探索物联网架构的区块链与人工智能的应用,分析区块链技术与人工智能的使用情况,以期为后期技术的更迭提供帮助.

关键词：区块链人工智能技术融合

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Tribocorrosion Behavior and Degradation Mechanism of 316L Stainless Steel in Alkaline Solution:Effect of Tribo-Film

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Acta Metallurgica Sinica(English Letters) 2022年第8期35卷 1365-1375页

作者： Jingyi Zou Zhongwei Wang yanlong ma Liwen Tan College of material Science and Engineering Chongqing University of TechnologyChongqing 400054China

Tribocorrosion behavior and degradation mechanism of 316L stainless steel(SS)in alkaline solution were studied.The SS was worn in 0.1 mol/L NaOH solution with different potentials to investigate the synergism between wear and corrosion.The SS showed larger material loss at a cathodic potential of-0.8 V and lower material loss at anodic potential when compared with that under pure wear condition.This was inverse when compared with that in other corrosive media,such as H_(2)SO_(4)and NaCl solutions.The formation of Tribo-films with different properties at different potentials played decisive role in the degradation process.Tribo-films were formed at cathodic potential(-0.8 V)and anodic potentials(0 and 0.4 V).The tribo-film formed at-0.8 V had the highest O content and was very brittle.It resulted in the easily peeling off of the film and then the acceleration of material degradation.By contrast,the Tribo-films formed at anodic potentials were more complete and the O content was much lower.Such kind of ductile Tribo-films could protect the SS from wear.The locally high concentration of OH-produced in the reduction reaction of oxygen at-0.8 V could react with the tribo-film which consist of nano-particles(NPs)with high chemical activity and finally led to deep oxidation and embrittlement of the film.The passivation of the NPs at the anodic potentials could inhibit the oxidation of tribo-film to maintain its ductility.

关键词： Tribocorrosion 316L stainless steel NaOH Tribo-film Nano-particles

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Comparative Study on Corrosion Behavior and Mechanism of As-Cast Mg-Zn-Y and Mg-Zn-Gd Alloys

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Acta Metallurgica Sinica(English Letters) 2023年第2期36卷 310-322页

作者： Guoqiang Xi Xuhan Zhao yanlong ma Yu Mou Ju Xiong Kai ma Jingfeng Wang College of material Science and Engineering Chongqing University of TechnologyChongqing400054China College of materials Science and Engineering Chongqing UniversityChongqing400044China

Rare earth(RE)elements have large solid solubility in magnesium and are widely used to regulate the microstructure and property of advanced magnesium alloys.However,different kinds of RE elements have different effects on microstructure and property of the alloy.In this study,a Mg-Zn-Y alloy and a Mg-Zn-Gd alloy with alloying elements of the same atomic percentage were designed to clarify the effect of yttrium(Y)and gadolinium(Gd)on the corrosion behavior of as-cast MgZn_(2)_Y(2.66) and MgZn_(2)Gd_(2.66)alloys.The results show that the MgZn_(2)_Y(2.66) alloy is mainly composed ofα-Mg phase and long period stacking ordered(LPSO)phase,while MgZn_(2)Gd_(2.66)alloy is mainly composed ofα-Mg phase and(Mg,Gd)_(3)Zn phase(W phase).Generally speaking,the corrosion phenomena of the two alloys in 3.5 wt%NaCl solution are similar.In the early stages of exposure,the alloys underwent uniform corrosion at a relatively low corrosion rate.With prolonged exposure,localized corrosion became dominated and the corrosion rate was greatly increased.However,the corrosion rate of the MgZn_(2)_Y(2.66) alloy,in terms of the corrosion current density,is about one order of magnitude lower than that of the MgZn_(2)Gd_(2.66)alloy.The high corrosion resistance of the MgZn_(2)_Y(2.66) alloy is mainly attributed to the presence of LPSO phase in form of continuous networks and the relatively high corrosion resistance of the corrosion product layer on the alloy.

关键词： magnesium alloys Rare earth Long period stacking ordered(LPSO)phase Microstructure Corrosion

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Effect of air-formed film on corrosion behavior of magnesium-lithium alloys

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Journal of magnesium and Alloys 2023年第11期11卷 4325-4337页

作者： yanlong ma Lei Liu Xinxin Zhang Fei Guo Xiaorong Zhou Mingbo Yang Jingfeng Wang College of materials Science and Engineering Chongqing University of TechnologyChongqing 400054China Key Laboratory of material Chemistry for Energy Conversion and Storage Ministry of EducationHubei Key Laboratory of Material Chemistry and Service FailureSchool of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan 430074China Corrosion and Protection Centre School of MaterialsThe University of ManchesterManchester M139PLUK College of materials Science and Engineering Chongqing UniversityChongqing 400044China

It is recently suggested that air-formed film plays an important role in controlling corrosion resistance of Mg-Li alloys. However, the structure of the air-formed film and its effect on corrosion resistance of Mg-Li alloys has not been fully understood. Firstly, the air-formed films formed on α and β phases in a dual-phase LZ91 Mg-Li alloy after exposure to laboratory air for up to 48 h have been examined by SEM under the assistance of ultramicrotomy. Then, the effect of the air-formed film on surface potential and, consequently, corrosion/oxidation behavior of the alloy has been investigated. Finally, in order to exclude the influence from α phase, the structure of the air-formed film on β phase and its effect on corrosion/oxidation behavior of Mg-Li alloys have been studied based on a single-phase LA141 Mg-Li alloy. The results show that the air-formed film is thin and negligible on α phase but thick on β phase after prolonged exposure to laboratory air. The thick air-formed film on β phase has a multilayer structure with an inner layer consisting of Mg O/Mg(OH)_(2) and outer layer consisting of Li_(2)CO_(3), which greatly elevates the surface potential of β phase in air. Both LZ91 and LA141 Mg-Li alloys firstly undergo uniform corrosion and then filiform corrosion when immersed in Na Cl solution and the pre-existed air-formed film on β-Li phase can retard the occurrence of filiform corrosion in the alloys.

关键词： magnesium-lithium alloy Air-formed film Uniform corrosion Filiform corrosion

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Rolling texture development in a dual-phase Mg-Li alloy:The role of temperature

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Journal of magnesium and Alloys 2023年第8期11卷 2980-2990页

作者： Xiaoyan Li Fei Guo yanlong ma Luyao Jiang Hongliang Lai Haiding Liu Dingfei Zhang Risheng Pei College of materials Science and Engineering Chongqing University of TechnologyChongqing 400054China Chongqing materials Research Institute Co. LtdChongqing 400707China College of materials Science and Engineering Chongqing UniversityChongqing 400044China Institut für Metallkunde und Metallphysik RWTH Aachen UniversityAachen 52056Germany

Dual-phase Mg-Li alloys sheets were rolled at four different temperatures ranging from liquid nitrogen to 300℃to explore effect of rolling temperature on texture and mechanical properties of the material.Crystal plasticity simulation was utilized to illustrate the influence of slip activity on rolling texture development.The results show that the rolling texture is largely depended on deformation temperature.Unlike commercial Mg alloys,the critical resolved shear stress of basal slip inα-Mg phase of Mg-Li alloy decreased more significantly by increasing temperature compared to that of pyramidalslip.Enhancement of basal slip by increasing temperature triggered a decrease of split angle of basal poles for the double-peak texture.Prismaticslip largely enhanced by increasing temperature upon 200℃,which induced a wider orientation spread along the transverse direction.For theβ-Li phase,the promotion of{110}slip system at elevated temperature triggered the enhancement of{211}and{111}texture components.The cryo-rolled sample exhibited the highest strength compared to the others due to a strong hardening behavior at this temperature.A two-stage hardening behavior was observed in these as-rolled dual-phase alloys.Strain transition at phase boundaries could be the reason for appearance of this two-stage hardening.

关键词： magnesium-Lithium alloys Dual-phase Texture Slip behavior Mechanical properties

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数字人文视域下新疆红色文化资源开发与利用

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兰台世界 2024年第4期 125-129页

作者：马岩龙胡可杨朱佳煊赵磊肖雅新疆军区档案馆中共新疆维吾尔自治区委员会党校图书馆

数字人文的发展为新疆红色文化资源开发与利用提供了发展契机,对完整准确贯彻新时代党的治疆方略具有重要作用。新疆红色文化资源是中国共产党带领新疆各族人民在不懈奋斗中形成的宝贵文化资源,是讲好红色故事、传承红色基因的生动教材... 详细信息

数字人文的发展为新疆红色文化资源开发与利用提供了发展契机,对完整准确贯彻新时代党的治疆方略具有重要作用。新疆红色文化资源是中国共产党带领新疆各族人民在不懈奋斗中形成的宝贵文化资源,是讲好红色故事、传承红色基因的生动教材,也是全面推进文化润疆国家战略的重要“沃土”。为建立健全红色文化资源体制机制,推进数字人文助力文化润疆,凝聚起新时代建设美丽新疆的磅礴精神力量,应着力从法制规约、顶层设计、科技赋能、凝聚合力等方面发挥新疆红色文化资源资政育人、培根铸魂、民族团结的重要作用。

关键词：数字人文新疆红色文化资源开发与利用

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