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Mechanical properties and deformation behavior of Zr-based bulk metallic glass composites reinforced with tungsten fibers or tungsten powders

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China Foundry 2024年第6期21卷 659-666页

作者： Zhen Zhang Jin-he Wang zheng-kun li Hua-meng Fu Hong li zheng-wang Zhu Hai-feng Zhang School of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870China Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Metallurgy Northeastern UniversityShenyang 110004China

The tungsten fibers or powders reinforced Zr_(52)Cu_(32)Ni_(6)Al_(10),(Zr_(52)Cu_(32)Ni_(6)Al_(10))_(98)Nb_(2),and(Zr_(52)Cu_(32)Ni_(6)Al_(10))_(98)Be_(2)bulk metallic glass composites(BMGCs)were fabricated using the infiltration casting *** this study,the wettability between the amorphous alloy melts and tungsten substrates was investigated using the sessile drop method,revealing excellent wettability at 1,010℃.Consequently,an infiltration temperature of 1,010°C was chosen for composite material *** characterization and mechanical property test of both composites were conducted through scanning electron microscopy(SEM),and X-ray diffraction(XRD),and universal mechanical *** tungsten fiber or tungsten powder reinforced Zr_(52)Cu_(32)Ni_(6)Al_(10)and(Zr_(52)Cu_(32)Ni_(6)Al_(10))_(98)Be_(2)composites exhibit the formation of W-Zr *** contrast,the tungsten fiber or tungsten powder reinforced(Zr_(52)Cu_(32)Ni_(6)Al_(10))_(98)Nb_(2)composites does not show the formation of W-Zr phase.X-ray diffraction patterns confirm the presence of W reinforcement phases in both *** successful fabrication of both composites is evidenced by their remarkable mechanical properties under room temperature *** yield strength of all the three tungsten fiber-reinforced composite sample exceeds 2,400 MPa,with the plastic strain exceeding 3.9%,while the yield strength of all the three tungsten powder-reinforced composite sample surpasses 2,700 MPa,with the plastic strain exceeding 30%.Fracture analysis reveals longitudinal splitting in the tungsten fiber-reinforced composites,contrasting with brittle fracture in the tungsten powder-reinforced *** denser the shear bands on the amorphous matrix of the two types of composite materials,the better their mechanical properties.

关键词： Zr-based BMGCs shear bands fracture mode compression mechanical properties wettability

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Effect of microalloying on wettability and interface characteristics of Zr-based bulk metallic glasses with W substrate

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China Foundry 2024年第4期21卷 352-359页

作者： Zhen Zhang lin-na Feng Jin-he Wang zheng-kun li Hua-meng Fu Hong li zheng-wang Zhu Hai-feng Zhang School of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870China Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China School of Metallurgy Northeastern UniversityShenyang 110004China

The infiltration casting method is widely employed for the preparation of ex-situ composite ***,the production of composite materials using this method must necessitates a comprehensive understanding of the wettability and interface characteristics between the reinforcing phase and the bulk metallic glasses(BMGs).This work optimized the composition of Zr-based BMGs through microalloying methods,resulting in a new set of Zr-based BMGs with excellent glass-forming *** experiments between the Zr-based BMGs melts and W substrates were conducted using the traditional sessile drop method,and the interfaces were characterized utilizing a scanning electron microscope(SEM)equipped with energy dispersive X-ray spectroscopy(EDS).The work demonstrates that the microalloying method substantially enhances the wettability of the Zr-based BMGs ***,the incorporation of Nb element impedes the formation of W-Zr phases,but the introduction of Nb element does not alter the extent of interdiffusion between the constituent elements of the amorphous matrix and W element,indicating that the influence of Nb element on the diffusion of individual elements is minute.

关键词： Zr-based BMGs infiltration casting method wettability interface characteristics W-Zr phases

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Effects of Ti addition on corrosion behavior of Zr-based metallic glass in chloride medium

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Journal of Iron and Steel Research International 2018年第6期25卷 650-657页

作者： Zhang-wei-jia Qiu Hua-meng Fu Hong-wei Zhang Hong li zheng-kun li Long Zhang zheng-wang Zhu Ai-min Wang Hai-feng Zhang School of Materials Science and Engineering University ofScience and Technology of ChinaShenyang 110016 Liaoning China Shenyang National Laboratory for Material Science Instituteof Metal Research Chinese Academy of SciencesShenyang 110016 Liaoning China Dongguan Eontec Co. Ltd. Dongguan 523662 GuangdongChina liaoning Jinyan liquid Metal Technology Co. Ltd.Shenyang 110100 Liaoning China

The effects of Ti element on the corrosion resistance of the metallic glass ***0.8 in aqueous solution with various chloride concentrations were investigated, and the effect mechanism was discussed. X-ray diffraction con-firmed that Ti-added ***0.8 metallic glasses with diameter of 3 mm were all metallic glasses. Weight loss and electrochemical method were introduced to characterize their corrosion resistance, and X-ray photo-electron spectroscopy study was used t9 characterize the passive film composition. The results show that the corrosion resistance of metallic glass is significantly improved with Ti addition, and Zr dioxides dominate in passive film during corrosion when Ti content is low. High Ti addition can lead to an obvious accumulation of Ti dioxides, which results in a thicker, Ti-enriched protective passive film.

关键词： Zr-based metallic glass Amorphous alloy Titanium Corrosion resistance Electrochemical method Corrosion behavior

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Deformation behavior of Ta wire-reinforced Zr-based bulk metallic glass composites

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Journal of Iron and Steel Research International 2018年第6期25卷 601-607页

作者： Sen Chen Hua-meng Fu zheng-kun li Long Zhang Hong-wei Zhang zheng-wang Zhu Hong li Ai-min Wang Yan-dong Wang Hai-feng zhang School of Materials Science and Engineering NortheasternUniversity Shenyang 110819 Liaoning China Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of SciencesShenyang 110016 Liaoning China Dongguan Eontec Co. Ltd. Dongguan 523662 GuangdongChina liaoning Jinyan liquid Metal Technology Co. Ltd.Shenyang 110100 Liaoning China

A Ta wire-reinforced Zr-based bulk metallic glass composite with a new type of structure was prepared successfully by the method of liquid metal infiltration. Ta wires distribute uniformly in the metallic glass matrix in the form of spirals. The composite exhibits two yield stages under compressive stress, and the samples are compressed into thin pancakes. The micro-cracks originate at the interface between the Ta wire and the metallic glass matrix and propagate perpendicularly to the interface, which then induce multiple shear bands in the metallic glass matrix due to the stress concentration. Shear cracks form in the metallic glass matrix during the continued loading process as a result of the interaction of shear bands. Deformation bands of Ta wires occur under the impact of shear bands. The local stress fields in the composite are changed obviously due to the introduction of the spiral-formed reinforcements. The investigation of the deformation behavior and mechanism suggests a new method for the application of bulk metallic glass composites as the structural materials.

关键词： Bulk metallic glass composite Ta wire Spiral Shear band Deformation behavior

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Achieving a High-Strength CoCrFeNiCu High-Entropy Alloy with an Ultrafine-Grained Structure via Friction Stir Processing

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Acta Metallurgica Sinica(English Letters) 2020年第7期33卷 947-956页

作者： Ning li Cun-Lei Jia Zhi-Wei Wang li-Hui Wu Ding-Rui Ni zheng-kun li Hua-Meng Fu Peng Xue Bo-Lv Xiao Zong-Yi Ma Yi Shao Yun-Long Chang School of Material Science and Engineering Shenyang University of TechnologyShenyang 110870China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of Sciences72 Wenhua RoadShenyang 110016China

High-entropy alloys(HEAs) are a new class of materials with a potential engineering application,but how to obtain ultrafine or nano-sized crystal structures of HEAs has been a ***,we first presented an equiatomic CoCrFeNiCu HEA with excellent mechanical properties obtained via friction stir processing(FSP).After FSP,the Cu element segregation in the cast CoCrFeNiCu HEA was almost eliminated,and the cast coarse two-phase structure(several micrometers) was changed into an ultrafine-grained single-phase structure(150 nm) with a large fraction of high-angle grain boundaries and nanoscale deformation *** unique microstructure was mainly attributed to the severe plastic deformation during FSP,and the sluggish diffusion effect in dynamics and the lattice distortion effect in crystallography for ***,FSP largely improved the hardness and yield strength of the CoCrFeNiCu HEA with a value of 380 HV and more than 1150 MPa,respectively,which were> 1.5 times higher than those of the base *** great strengthening after FSP was mainly attributed to the significant grain refinement with large lattice distortion and *** study provides a new method to largely refine the microstructure and improve the strength of cast CoCrFeNiCu HEAs.

关键词： grain microstructure deformation

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DDS中正弦波每周期离散点数对失真度的影响研究

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计算机科学 2012年第S2期39卷 36-38页

作者：郑礼坤李哲英北京市信息服务重点实验室北京联合大学信息学院北京100101

失真度是评价数字合成波形质量的重要指标,主要取决于正弦波在一个周期内总的离散点数和数模转换器的位数。从频谱的角度分析DDS输出最高频率时每周期点数对失真度的影响,得出离散点数与失真度的关系表达式。同时,分析了不同阶次Butterw... 详细信息

失真度是评价数字合成波形质量的重要指标,主要取决于正弦波在一个周期内总的离散点数和数模转换器的位数。从频谱的角度分析DDS输出最高频率时每周期点数对失真度的影响,得出离散点数与失真度的关系表达式。同时,分析了不同阶次Butterworth低通滤波器的作用。

关键词：数字频率合成波形失真度离散点数

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骨髓间充质干细胞的免疫调节活性

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第二军医大学学报 2009年第6期30卷 717-721页

作者：申娜陈乃耀郑丽坤华北煤炭医学院附属医院血液科唐山063000 华北煤炭医学院附属开滦医院血液科唐山063000

骨髓间充质干细胞(bone marrow mesenchymal stem cells,BMSCs)是一种多潜能的非造血干细胞,可以向多系分化,如骨、脂肪和软骨,并优先归巢于损伤组织,有利于组织修复。体外研究显示它们不诱导免疫应答,对识别、清除同种异体抗原的免疫... 详细信息

骨髓间充质干细胞(bone marrow mesenchymal stem cells,BMSCs)是一种多潜能的非造血干细胞,可以向多系分化,如骨、脂肪和软骨,并优先归巢于损伤组织,有利于组织修复。体外研究显示它们不诱导免疫应答,对识别、清除同种异体抗原的免疫细胞具有抑制作用。在动物实验中,骨髓间充质干细胞可以诱导外周免疫耐受并向损伤处迁移,抑制致炎细胞因子的释放,促进损伤组织修复。这种独特作用说明它们在细胞治疗和自身免疫性疾病治疗中发挥了积极作用。

关键词：骨髓间充质干细胞免疫调节免疫抑制

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确定三项式产能方程系数的新方法

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大庆石油地质与开发 2008年第4期27卷 61-63页

作者：李伟于士泉郑丽坤大庆油田有限责任公司勘探开发研究院黑龙江大庆163712 大庆石油学院石油工程学院黑龙江大庆163318

二项式产能方程只能描述高速非达西渗流,对于低渗压裂气井,地层的低渗透性和裂缝的高导流能力使得其渗流规律已经和压裂前大不一样,二项式产能方程已无法描述气井的生产状况,必须建立新的方程。用三项式取代二项式,是油气井产能试井的... 详细信息

二项式产能方程只能描述高速非达西渗流,对于低渗压裂气井,地层的低渗透性和裂缝的高导流能力使得其渗流规律已经和压裂前大不一样,二项式产能方程已无法描述气井的生产状况,必须建立新的方程。用三项式取代二项式,是油气井产能试井的一种新的理论和方法。气井三项式产能方程计算气井无阻流量关键在于确定系数值。在分析推理得出了一种简单的方法来确定气井三项式产能方程的基础上,通过井底流压和产气量的数据,利用线性回归法,即可建立三项式产能方程。通过某气藏的实际资料计算结果表明提出的方法计算结果可靠,具有较为广阔的应用前景。

关键词：气井三项式产能新方法

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大型汽轮机组节能降耗问题的探讨

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广东电力 2006年第10期19卷 29-31页

作者：郑李坤广东省电力试验研究所广州510600

通过对600MW汽轮机组的调试和性能测试,详细分析了现代大型汽轮机组在实际运行中普遍存在的运行方式不合理等问题以及对机组经济性的影响,并提出了一些提高电厂运行经济性的建议。

关键词：汽轮机组热耗率配汽方式内漏

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Targets capture by distributed active swarms via bio-inspired reinforcement learning

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Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 210-221页

作者： kun Xu Yue li Jun Sun Shuyuan Du Xinpeng Di Yuguang Yang Bo li Institute of Biomechanics and Medical Engineering Applied Mechanics Laboratory Department of Engineering MechanicsTsinghua University Institute of Nuclear and New Energy Technology Tsinghua University Shanghai Aerospace Control Technology Institute Shanghai Key Laboratory of Aerospace Intelligent Control Technology College of Automation Engineering Nanjing University of Aeronautics and Astronautics

Natural swarms arranged from cells to herds are usually decentralized but display intriguing collective intelligence in coordinating individuals across large scales to efficiently achieve their common goals. Learning from nature may provide new strategies for controlling collective dynamics of synthetic swarms to accomplish specific functions. Here, we present a bioinspired computational framework that steers distributed active swarms to collectively capture and merge targets via reinforcement learning. We exploit collective milling structures of natural herds to cage the targets, and adopt a switching control policy inspired by sperms' chiral dynamics to optimize the trajectories of individuals, through which the active swarms can selforganize to enclose single or multiple distant targets in a dynamical, adaptive and scalable manner. There exists a critical swarm size, beyond which the excessive competition between agents would generate large mechanical forces, leading to capture instability but enabling the transition from short-distance to long-distance merging capture of multiple targets. This work provides physical insights into distributed active swarms and could offer a multilevel, decentralized strategy toward controlling swarm robotics in wide applications such as bio-medical devices, machine immunity, and target clearance.

关键词： swarm intelligence robotics multi-tasks artificial intelligence bionics

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