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Formation and Structural Evolution of Fe72.5B15.6Si7.8Nb1.7Zr1.7Cu0.7 Nanocrystalline Alloy

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Acta Metallurgica Sinica(English Letters) 2020年第2期33卷 313-318页

作者： yao-xiang geng Hong-Yu Ding Dong-Peng Wang Zhi-Jie Zhang Hong-Bo Ju Li-Hua Yu Jun-Hua Xu School of Materials Science and Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China Marine Equipment and Technology Institute Jiangsu University of Science and TechnologyZhenjiang 212003China

A 2.5-mm Fe72.5B15.6Si7.8Nb1.7Zr1.7Cu0.7 glassy rod was successfully fabricated using copper mold *** introduction of Cu resulted in the formation of large quantities of a-Fe nanoparticles embedded in the glassy matrix after isothermal *** Fe72.5B15.6Si7.8Nb1.7Zr1.7Cu0.7 nanocrystalline alloy exhibited high saturation magnetization(~1.26 T) and a low coercive force(~0.8 A/m) after annealing at 833 K for 15 min due to the precipitation of ~15-nm-sized a-Fe nanoparticles in the glassy *** structural evolution of the FeBSiNbZrCu amorphous alloy during the annealing process was discussed using a dual-cluster model.

关键词： Nanocrystalline alloy Magnetic property Dual-cluster model Structural evolution

Formation and properties of high Fe-content Fe-(B-Si)-Zr bulk amorphous alloys

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International Journal of Minerals,Metallurgy and Materials 2013年第4期20卷 371-374页

作者： yao-xiang geng Ying-min Wang Jian-bing Qiang Qing Wang Fan-yang Kong Gui-feng Zhang Chuang Dong Key Laboratory of Materials Modification (Ministry of Education) Dalian University of Technology

The present work is devoted to the development of Fe-（B-Si）-Zr amorphous alloys with high glass-forming ability and good magnetic properties. Using the cluster-plus-glue-atom model proposed for ideal amorphous structures, [FeFe11B3Si]（Fe1-xZrx） was determined as the cluster formula of Fe-（B-Si）-Zr alloys. The glass formation and thermal stability of the serial alloys, namely, [FeFel^B3Si]（Fel_xZrx）（x = 0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.75, and 1.0）, were studied by the combination of copper mold casting, X-ray diffraction, and differential thermal analysis techniques. The maxima of glass-forming ability and thermal stability were found to occur at the compositions of [FeFe11B3Si] （Fe0.6Zr0.4） and [FeFe11B3Si]（Fe0.5Zr0.5）. The alloys can be cast into amorphous rods with 1.5 ram diameter, and upon reheating, the amorphous alloys exhibit a large undercooled liquid span of 37 K. The saturation magnetization of the [FeFe11B3Si]（Fe0.5Zr0.5） amorphous alloy was measured to be 1.4 T.

关键词： amorphous alloys iron zirconium alloys melt spinning glass-forming ability magnetic properties thermal stability

Crack elimination and strength enhancement mechanisms of selective laser melted Si-modified Al−Mn−Mg−Er−Zr alloy

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Transactions of Nonferrous Metals Society of China 2024年第8期34卷 2431-2441页

作者： Jiang YU yao-xiang geng Hong-bo JU Zhi-jie ZHANG Jun-hua XU School of Materials Science and Engineering Jiangsu University of Science and TechnologyZhenjiang 212100China Department of Mechanical Engineering CEMMPRE-Centre for Mechanical Engineering Materials and ProcessesUniversity of CoimbraCoimbraPortugal

In order to increase the processability and process window of the selective laser melting(SLM)-fabricated Al−Mn−Mg−Er−Zr alloy,a novel Si-modified Al−Mn−Mg−Er−Zr alloy was *** effect of Si alloying on the surface quality,processability,microstructure,and mechanical properties of the SLM-fabricated alloy was *** results showed that introducing Si into the Al−Mn−Mg−Er−Zr alloy prevented balling and keyhole formation,refined the grain size,and reduced the solidification temperature,which eliminated cracks and increased the processability and process window of the *** maximum relative density of the SLM-fabricated Si/Al−Mn−Mg−Er−Zr alloy reached 99.6%.The yield strength and ultimate tensile strength of the alloy were(371±7)MPa and(518±6)MPa,*** values were higher than those of the SLM-fabricated Al−Mn−Mg−Er−Zr and other Sc-free Al−Mg-based alloys.

关键词： selective laser melting Al−Mn−Mg−Er−Zr−Si alloy surface roughness processability mechanical properties

Strength and plasticity improvement induced by strong grain refinement after Zr alloying in selective laser-melted AlSiMg1.4 alloy

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Transactions of Nonferrous Metals Society of China 2024年第9期34卷 2733-2742页

作者： yao-xiang geng Chun-feng ZAI Jiang YU Hao TANG Hong-wei LÜ Zhi-jie ZHANG School of Materials Science and Engineering Jiangsu University of Science and TechnologyZhenjiang 212100China National Engineering Research Center of Near-Net Shape Forming for Metallic Materials South China University of TechnologyGuangzhou 510640China

In order to enhance the mechanical properties of the selective laser-melted(SLM) high-Mg content AlSiMg1.4 alloy,the Zr element was *** influence of Zr alloying on the processability,microstructure,and mechanical properties of the alloy was systematically investigated through performing microstructure analysis and tensile *** was demonstrated that the SLM-fabricated AlSiMg1.4-Zr alloy exhibited high process stability with a relative density of over 99.5% at various process ***,the strong grain refinement induced by the primary Al3Zr particle during the melt solidification process simultaneously enhanced both the strength and plasticity of the *** values for the yield strength,ultimate tensile strength,and elongation of the SLM-fabricated AlSiMg1.4-Zr were(343±3) MPa,(485±4) MPa,and(10.2±0.2)%,respectively,demonstrating good strengthplasticity synergy in comparison to the AlSiMg1.4 and other Al-Si-based alloys fabricated by SLM.

关键词： selective laser melting process stability grain refinement microstructure mechanical properties

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激光粉末床熔融成形高性能Al-Mn-Mg-Sc-Zr合金的显微组织演变及力学性能

第十一届中国钢铁年会

作者： yao-xiang geng Lin X. Jie L. Fan S.M. Xu J.H. Yu L.H. School of Materials Science and Engineering Jiangsu University of Science and Technology State Key Laboratory of Solidification Processing Northwestern Polytechnical University

In this work, the alloying effects of similar atom substitution of Co for Fe on the glass-forming ability and the various properties of FeCoBSiZr and FeCoBSiHf(x, y = 0, 5, 10, 15, 20 and 25) metallic glass are *** experiments show that the substitution of Co for Fe causes a decrease in the glass-forming *** increasing the content of Co, the critical glass formation size gradually decreases from 2.5 mm to 1 ***-indentation results indicate that the elastic modulus and hardness intensify with increasing Co content in FeCoBSiZr bulk glassy *** bulk glassy alloy exhibits super-high elastic modulus and hardness of over 240 GPa and 19 GPa, *** of the glassy alloys exhibit good soft magnetic properties with high saturation magnetization(1.12.33 T) and low coercive force(0.65.2 A/m).

关键词： (Fe,Co,)-B-Si-Zr/Hf bulk glass alloys glass-forming ability mechanical property magnetic property

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Transactions of Nonferrous Metals Society of China 2024年第5期34卷 1413-1426页

作者：唐浩耿遥祥高超峰席晓莹张建涛肖志瑜华南理工大学国家金属材料近净成形工程技术研究中心广州510640 江苏科技大学材料科学与工程学院镇江212003 季华实验室先进增材制造研究所佛山528200

系统研究时效温度对激光粉末床熔融成形Al-Mn-Mg-Sc-Zr合金显微组织及力学性能的影响。结果表明,成形态合金组织致密且无裂纹,平均晶粒尺寸为3.51μm,屈服强度为(547±3)MPa。经300℃时效后,合金组织中析出大量尺寸为2~3 nm且与基体共格... 详细信息

系统研究时效温度对激光粉末床熔融成形Al-Mn-Mg-Sc-Zr合金显微组织及力学性能的影响。结果表明,成形态合金组织致密且无裂纹,平均晶粒尺寸为3.51μm,屈服强度为(547±3)MPa。经300℃时效后,合金组织中析出大量尺寸为2~3 nm且与基体共格的Al3Sc纳米颗粒。时效样品的屈服强度提升至(616±4)MPa,这得益于合金中的析出强化、固溶强化和晶界强化。当时效温度超过300℃时,部分Mn和Zr从固溶体中析出,形成Al6Mn和Al3(Sc,Zr)相。经500℃时效后,合金中Al6Mn相和Al3(Sc,Zr)相分别粗化至约600和30nm。此,合金的屈服强度下降至(372±3) MPa。

关键词：激光粉末床熔融 Al-Mn-Mg-Sc-Zr合金显微组织演变力学性能 Al3Sc纳米颗粒

Single Failure Routing Protection Algorithm in the Hybrid SDN Network

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Computers, Materials & Continua 2020年第7期64卷 665-679页

作者： Haijun geng Jiangyuan yao Yangyang Zhang School of Software Engineering Shanxi UniversityTaiyuan030006China School of Computer Science and Cyberspace Security Hainan UniversityHaikou570228China College of Engineering Northeastern University Boston02115USA

Loop free alternate(LFA)is a routing protection scheme that is currently deployed in commercial ***,LFA cannot handle all single network component failure scenarios in traditional *** Internet service providers have begun to deploy software defined network(SDN)technology,the Internet will be in a hybrid SDN network where traditional and SDN devices coexist for a long ***,this study aims to deploy the LFA scheme in hybrid SDN network architecture to handle all possible single network component failure ***,the deployment of LFA scheme in a hybrid SDN network is described as a 0-1 integer linear programming(ILP)***,two greedy algorithms,namely,greedy algorithm for LFA based on hybrid SDN(GALFAHSDN)and improved greedy algorithm for LFA based on hybrid SDN(IGALFAHSDN),are proposed to solve the proposed ***,both algorithms are tested in the simulation environment and the real *** results show that GALFAHSDN and IGALFAHSDN can cope with all single network component failure scenarios when only a small number of nodes are upgraded to SDN *** path stretch of the two algorithms is less than 1.36.

关键词： Multipath routing network availability routing protection algorithm network failure hybrid SDN network

Influence of coiling temperature on microstructure and mechanical properties of a hot-rolled high-strength steel microalloyed with Ti,Mo and V

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Journal of Iron and Steel Research International 2022年第3期29卷 484-493页

作者： Zhi-xiang Fu geng-wei Yang Ru-yang Han yao-wen Xu Xin-ping Mao Si-qian Bao Gang Zhao Hubei Provincial Key Laboratory for New Processes of Iron Making and Steel Making Wuhan University of Science and TechnologyWuhan430081HubeiChina The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan430081HubeiChina Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing100083China

Influence of coiling temperature(CT)on the microstructure and mechanical properties of a hot-rolled high-strength steel microalloyed with Ti,Mo and V was *** precipitation behavior of nano-sized particles was investigated by theoretical calculation and quantitative *** the results revealed that V-enriched(Ti,Mo,V)C precipitated in the ferrite *** the CT decreased,the site fractions of Ti in(Ti,Mo,V)C changed little,the site fractions of Mo increased,and the site fractions of V decreased ***,the low CT could refine the microstructure and precipitated particles but suppress the precipitation of(Ti,Mo,V)C particles simultaneously,leading to the volume fraction of(Ti,Mo,V)C significantly decreasing,consequently causing an increment of grain refinement strengthening and a reduction in precipitation *** the CT was 600℃,the steel characterized by fine polygonal ferrite,a small amount of bainite and nano-sized(Ti,Mo,V)C precipitates exhibited the optimum mechanical properties with the ultimate tensile strength of 870 MPa,yield strength of 807 MPa and elongation to fracture of 17%.

关键词： Ti-Mo-V complex microalloying Coiling temperature Precipitation Strengthening mechanism Microstructure

Geochemistry of Subvolcanic-Type Copper-Silver Deposits in Eastern China

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Acta Geologica Sinica(English Edition) 2000年第3期74卷 511-515页

作者： geng Wenhui yao Jinyan Guilin Research Institute of Geology for Mineral Resources Guilin 541004Guangxi

The metallogenesis of subvolcanic deposits is controlled by subvolcanic activities. The copper polymetallic deposits are genetically related to intermediate-acid rocks, and the silver polymetallic deposits are more closely related to acid rocks. The abundance of Cu is relatively high in the intermediate-acid rocks and subvolcanic rocks, whereas the abundances of Pb, An and Ag are high in acid rocks, indicating rich ore-forming elements in original magmas. The study of REEs shows that the magmatic type related to copper deposits is the syntectic type, and that related to silver polymetallic deposits is mainly the re-melting type. The deposits were formed under medium-low temperatures and low salinity. The metallogenic times were the late stage of the early Yanshanian or the late Yanshanian, dating 78–147 Ma.

关键词： subvolcanic rocks copper silver deposits geochemistry eastern China