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Excellent reusability of FeBC amorphous ribbons induced by progressive formation of through-pore structure during acid orange 7 degradation

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Journal of Materials science & Technology 2020年第3期38卷 107-118页

作者： Fang Miao Qianqian Wang Qiaoshi Zeng Long Hou Tao Liang Zhiqiang Cui Baolong Shen School of Materials science and Engineering Jiangsu Key Laboratory for Advanced Metallic MaterialsSoutheast UniversityNanjing211189China Institute of Massive Amorphous Metal Science China University of Mining and TechnologyXuzhou221116China

The high-efficient degrading ability of Fe BC amorphous ribbons toward acid orange 7(AO7)via redox reactions is reported and compared with that of Fe PC amorphous ribbons.The time required for degrading50%of AO7 using Fe BC amorphous ribbons is only 1/3 of that using Fe PC amorphous ribbons.In the Fe BC amorphous matrix,galvanic cell structures are formed between the Fe-B and Fe-C bonds because of the large difference in their bonding strengths,which contributes to the low reaction activation energy and the high degrading efficiency of Fe BC amorphous ribbons.The extremely long service life of Fe BC amorphous ribbons comes from the progressive formation of 3 D porous nanosheet networks that allow more efficient mass transport and a larger specific surface area.The Fe BC amorphous ribbons show a satisfying degrading ability in not only acidic but also neutral and weak alkaline AO7 solutions.This work provides an effective and environmental-friendly material for degrading azo dyes.

关键词： 3D nanosheet arrays Through-pore Wastewater treatment FeBC amorphous alloys Synchrotron XRD

Microstructure and soft-magnetic properties of FeCoPCCu nanocrystalline alloys

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Journal of Materials science & Technology 2019年第8期35卷 1655-1661页

作者： Long Hou Xingdu Fan Qianqian Wang Weiming Yang Baolong Shen Jiangsu Key Laboratory for Advanced metallic Materials School of Materials Science and Engineering Southeast University Nanjing 211189 China Institute of Massive Amorphous Metal Science China University of Mining and Technology Xuzhou 221116 China

Fe(83.2-x)CoxP(10)C6Cu(0.8)(x=0,4,6,8 and 10)alloys with a high amorphous-forming ability and good softmagnetic properties were successfully synthesized.Saturation magnetic flux density(Bs)is effectively enhanced from 1.53 T to 1.61 T for as-quenched alloy by minor Co addition,which is consistent well with the result of the linear relationship between average magnetic moment and magnetic valence.For Cocontained alloys,the value of corecivity(Hc)is mainly determined by magneto-crystalline anisotropy,while effective permeability(μe)is dominated by grain size and average saturation polarization.After proper heat treatment,the Fe(79.2)Co4P(10)C6Cu(0.8)nanocrystalline alloy exhibited excellent soft-magnetic properties including a high Bsof 1.8 T,a low Hcof 6.6 A/m and a highμeof 15,510,which is closely related to the high volume fraction of α-(Fe,Co)grains and refined uniform nanocrystalline microstructure.

关键词： Anocrystalline alloy Microstructure Co addition Soft-magnetic properties Ferromagnetic exchange-coupling

A revisit to the role of Mo in an MP35N superalloy:An experimental and theoretical study

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Journal of Materials science & Technology 2023年第26期157卷 60-70页

作者： Qing Cheng Jinyong Mo Xiaoqing Li Xiandong Xu Center for High Resolution Electron Microscopy College of Materials Science and EngineeringHunan UniversityChangsha 410082China Institute of Massive Amorphous Metal Science School of Materials science and Physics China University of Mining and TechnologyXuzhou 221116China Department of Materials science and Engineering Applied Materials Physics KTH-Royal Institute of TechnologyStockholm SE-10044Sweden

Molybdenum(Mo)has been recognized as an essential alloying element of the MP35N(Co_(35.4)Cr_(22.9)Ni_(35.5)Mo_(6.2),at.%)superalloy for enhancing strength and corrosion resistance.However,a full understanding of the addition of Mo on microstructure and mechanical properties of the Mo-free parent alloy is lacking.In this work,we consider five(Co_(37.7)Cr_(24.4)Ni_(37.9))_(100-x)Mo_(x)(x=0,0.7,2.0,3.2,and 6.2)alloys,and reveal that yield/tensile strength and ductility are continuously increased for these alloys with increasing Mo content while a single-phase face-centered cubic structure remains unchanged.It is found that strong solid solution strengthening(SSS)is a main domain to the improved yield strength,whereas grain boundaries are found to soften by the Mo addition.The first-principles calculations demonstrate that a severe local lattice distortion contributes to the enhanced SSS,and the grain boundary softening effect is mostly associated with the decreased shear modulus.Both first-principles calculations and scanning transmission electron microscopy observations reveal that the stacking fault energy(SFE)reduces by the Mo addition.The calculated SFE value decreases from 0.4 mJ/m^(2) to-11.8 mJ/m^(2) at 0 K as Mo content increases from 0 at.%to 6.2 at.%,and experimentally measured values of SFE at room temperature for both samples are about 18 mJ/m^(2) and 9 mJ/m^(2),respectively.The reduction of SFE promoted the generation of stacking faults and deformation twins,which sustain a high strain hardening rate,thus postponing necking instability and enhancing tensile strength and elongation.

关键词： Mo addition Solid solution strengthening Grain boundary softening Local lattice distortion First-principles simulations Stacking fault energy Deformation twin

Correlation between deformation behavior and atomic-scale heterogeneity in Fe-based bulk metallic glasses

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Journal of Materials science & Technology 2021年第6期65卷 54-60页

作者： Jing Zhou Siyi Di Baoan Sun Qiaoshi Zeng Baolong Shen School of Materials science and Engineering Jiangsu Key Laboratory for Advanced Metallic MaterialsSoutheast UniversityNanjing 211189China institutes of Physics Chinese Academy of SciencesBeijing 100190China Institute of Massive Amorphous Metal Science China University of Mining and Technology.Xuzhou 221116China

The correlation betweent deformation behavior and atomic-scale heterogeneity of bulk metallic glasses(BMGs)is critical to understand the BMGs'deformation mechanism.In this work,three typical[(Fe_(0.5)Co_(0.5))_(0.75)B_(0.2)Si_(0.05)]_(96)Nb_4,Fe_(39)Ni_(39)B_(14.2)Si_(2.75)P_(2.75)Nb_(2.3),and Fe_(50)Ni_(30)P_(13)C_(7)BMGs exhibiting different plasticity were selected,and the correlation between deformation behavior and atomic-scale heterogeneity of Fe-based BMGs was studied.It is found that the serrated flow dynamics of Fe-based BMGs transform from chaotic state to self-organized critical state with increasing plasticity.This transformation is attributed to the increasing atomic-scale heterogeneity caused by the increasing free volume and short-to-medium range order,which facilitates a higher frequency of interaction and multiplication of shear bands,thereby results in a brittle to ductile transition in Fe-based BMGs.This work provides new evidence on heterogeneity in plastic Fe-based BMGs from the aspects of atomic-scale structure,and provides new insight into the plastic deformation of Fe-based BMGs.

关键词： Fe-based BMG Plasticity Serrated flow behavior Atomic-scale Heterogeneity

Efficient rejuvenation of heterogeneous{[(Fe_(0.5)Co_(0.5))_(0.75)B_(0.2)Si_(0.05)]_(96)Nb_(4)}_(99.9)Cu_(0.1) bulk metallic glass upon cryogenic cycling treatment

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Journal of Materials science & Technology 2022年第2期97卷 20-28页

作者： Siyi Di Qianqian Wang Yiyuan Yang Tao Liang Jing Zhou Lin Su Kuibo Yin Qiaoshi Zeng Litao Sun Baolong Shen School of Materials science and Engineering Jiangsu Key Laboratory for Advanced Metallic MaterialsSoutheast UniversityNanjing211189China SEU-FEI Nano-Pico Center Key Laboratory of MEMS of Ministry of EducationSoutheast UniversityNanjing210096China Institute of Massive Amorphous Metal Science China University of Mining and TechnologyXuzhou221116China

The effects of cryogenic thermal cycling on deformation behaviour and structural variation of{[(Fe_(0.5)Co_(0.5))_(0.75)B_(0.2)Si_(0.05)]_(96)Nb_(4)}_(99.9)Cu_(0.1) bulk metallic glass(BMG)were studied and compared with Cufree[(Fe_(0.5)Co_(0.5))_(0.75)B_(0.2)Si_(0.05)]_(96)Nb_(4) BMG.After thermal-cycled treatment between 393 K and cryogenic temperature,the{[(Fe_(0.5)Co_(0.5))_(0.75)B_(0.2)Si_(0.05)]_(96)Nb_(4)}_(99.9)Cu_(0.1)BMG obtained a plastic strain of 7.4%combined with a high yield strength of 4350 MPa.The excellent soft magnetic properties were maintained after CTC treatment.The minor addition of Cu element results in an initial nano-sized heterogeneity in the matrix,which facilitates the rejuvenation process during thermal cycling,and brings to a low optimal thermal temperature of 393 K,making the{[(Fe_(0.5)Co_(0.5))_(0.75)B_(0.2)Si_(0.05)]_(96)Nb_(4)}_(99.9)Cu_(0.1) BMG more attractive in industrial application.During thermal cycling,the formation of more soft regions leads to the increase of structural heterogeneities,which is beneficial to the initiation of shear transition zones and the formation of multiple shear bands,and thus results in the enhancement of plasticity.This study links the subtle variation of specific structure with macroscopic mechanical properties,and provides a new insight of composition selection for cryogenic thermal cycling treatment.

关键词： Bulk metallic glass Plasticity Cryogenic thermal cycling Rejuvenation Structural heterogeneity

Design of FeSiBPCu soft magnetic alloys with good amorphous forming ability and ultra-wide crystallization window

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Journal of Materials science & Technology 2023年第16期147卷 124-131页

作者： Xingdu Fan Tao Zhang Weiming Yang Junhua Luan Zengbao Jiao Hui Li Jiangsu Key Laboratory for Advanced metallic Materials School of Materials Science and EngineeringSoutheast UniversityNanjing 211189China Institute of Massive Amorphous Metal Science China University of Mining and TechnologyXuzhou 221116China Center for Advanced Structural Materials Department of Mechanical and Biomedical EngineeringCollege of Science and EngineeringCity University of Hong KongKowloonHong KongChina Department of Mechanical Engineering The Hong Kong Polytechnic UniversityHong KongChina School of Materials science and Engineering Shanghai UniversityShanghai 200444China

The Fe_(81.3)Si_(4)B_(13–x)PxCu_(1.7) soft magnetic alloys with high Cu and proper P elements addition were synthesized with the aim of ensuring the amorphous forming ability(AFA)while expanding the crystallization window(CW).It is found that the atomic ratio of P/Cu of∼3 is advantageous for AFA whereas a small amount of P addition promotes the precipitation ofα-Fe grains and excessive P addition induces surface crystallization behavior of the present alloys.High Cu concentration can expand the annealing temperature(Ta)window whereas proper P addition effectively expands the annealing time(ta)window.The Fe_(81.3)Si_(4)B_(13-x)PxCu_(1.7) soft magnetic alloy was successfully synthesized with a large Ta window of up to 130°C and ta window of 90 min,which is a breakthrough for nanocrystalline alloys with high saturation magnetization.Microstructure analysis reveals that the ultra-wide CW is related to the unique nucleation mechanism,that is,theα-Fe grains are precipitated attaching to the Cu or CuP clusters and enveloping the Cu clusters,resulting in the high number density ofα-Fe nanocrystals.The ultra-wide CW promises the potential material in flexibly choosing the annealing process according to the performance.

关键词： Nanocrystalline alloys amorphous forming ability Crystallization window Soft magnetic properties

A plastic FeNi-based bulk metallic glass and its deformation behavior

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Journal of Materials science & Technology 2021年第17期76卷 20-32页

作者： Jing Zhou Qianqian Wang Qiaoshi Zeng Kuibo Yin ing Wang Junhua Luan Litao Sun Baolong Shen School of Materials science and Engineering Jiangsu Key Laboratory for Advanced Metallic MaterialsSoutheast UniversityNanjing211189China SEU-FEI Nano-Pico Center Key Laboratory ofMEMS of Ministry of EducationSoutheast UniversityNanjing210096China Center for Advanced Structural Materials Department of Mechanical and Biomedical EngineeringCollege of Science and EngineeringCity University of Hong KongKowloonHong KongChina Institute of Massive Amorphous Metal Science China University of Mining and TechnologyXuzhou221116China

The strength and plasticity of Fe_(39)Ni_(39)B_(12.82)Si_(2.75)Nb_(2.3)P_(4.13)bulk metallic glass(BMG)are improved simultaneously by modulating atomic-scale structure through fluxing treatment.The compression strength increases from 3074 to 4220 MPa,and the plastic strain is enlarged from 10.7%to more than 50%.The increased mechanical properties of the fluxed Fe Ni BSi Nb P BMG originate from the optimization of atomic-scale structure.More icosahedral-like clusters(ILCs)and crystal-like clusters(CLCs)are found in this Fe Ni-based BMG with fluxing treatment,and the ILCs are usually surrounded by CLCs.Furthermore,phase separation and a sandwich-like heterogeneous structure of SB are also observed during deformation,indicating the multiscale deformation mechanism and a stable shear-band evolution.The unique"ILC surrounded by CLCs"structure and phase separation lead to a stable plastic deformation process with strong interactions of multiple shear bands,thereby the improved plasticity and strength.This work provides useful guidelines to develop strong and plastic Fe-based BMGs from a structural aspect.

关键词： FeNi-based BMG Plasticity Strength Structural heterogeneity Shear bands

Liquid dynamics and glass formation of Gd_(55)Co_(20)Al_(25)metallic glass with minor Si addition

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Journal of Materials science & Technology 2021年第18期77卷 28-37页

作者： Lin Xue Liliang Shao Qiang Luo Lina Hu Yunbo Zhao Kuibo Yin Mingyun Zhu Litao Sun Baolong Shen Xiufang Bian School of Materials science and Engineering Jiangsu Key Laboratory of Advanced Metallic MaterialsSoutheast UniversityNanjing 211189China School of Materials science and Engineering Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials(Ministry of Education)Shandong UniversityJinan 250061China SEU-FEI Nano-Pico Center Key Laboratory of MEMS of Ministry of EducationSchool of Electronic Science and EngineeringSoutheast UniversityNanjing 210018China Institute of Massive Amorphous Metal Science.China University of Mining and Technology.Xuzhou 221116 China

Liquid dynamics plays an essential role in glass formation.Here we observed a distinct change of liquid dynamics in Gd_(55)Co_(20)Al_(25)metallic glass induced by microalloying Si element.In the equilibrium melt,minor Si(0.5 at.%)addition leads to a more fragile liquid behavior and a smaller strength of liquid-liquid transition with the transition strength(F)decreasing from 0.76 to 0.35.However,in the supercooled liquid,Si-doped liquid exhibits a remarkable enhanced fragile-to-strong transition(FST),and the value of FST factor f increases sharply from 1.63 to 3.84,resulting in a stronger liquid behavior and more sluggish crystallization kinetics for Gd_(55)Co_(20)Al_(24.5)Si_(0.5)metallic glass.Moreover,minor Si addition promotes the formation of a crystal-like structure with a size of 1-2 nm.The interactions between the crystal-like structures and other local favored clusters frustrate the further growth of crystal-like phases,thus stabilizes the amorphous structure.As a result,the glass-forming ability(GFA)was largely improved.The critical diameter of Gd_(55)Co_(20)Al_(25)metallic glass increased from 2 to 7 mm with 0.5 at.%Si addition without deterioration of the magnetocaloric effect.This study provides valuable insight for understanding the distinct effect of microalloying on GFA of metallic glasses from the aspect of the evolution of the liquid.

关键词： Glass-forming ability Liquid-liquid transition Fragile-to-strong transition Viscosity Relaxation

Mechanical Properties and Phase Stability of WTaMoNbTi Refractory High-Entropy Alloy at Elevated Temperatures

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Acta metallurgica Sinica(English Letters) 2021年第11期34卷 1585-1590页

作者： Yixing Wan Jinyong Mo Xin Wang Zhibin Zhang Baolong Shen Xiubing Liang Institute of Massive Amorphous Metal Science School of Materials Science and PhysicsChina University of Mining and TechnologyXuzhou 221116China Defense Innovation institute Academy of Military ScienceBeijing 100071China School of Materials science and Engineering Jiangsu Key Laboratory for Advanced Metallic MaterialsSoutheast UniversityNanjing 211189China School of Chemical Engineering and Technology China University of Mining and TechnologyXuzhou 221116China

High-temperature structural metals remain in high demand for aerospace aircraft,gas turbine engines,and nuclear power plants.Refractory high-entropy alloys(RHEAs)with superior mechanical properties at elevated temperatures are promising candidates for high-temperature structural materials.In this work,a WTaMoNbTi RHEA with adequate room temperature plasticity and considerable strength at 1600℃was fabricated by vacuum arc-melting.The room temperature fracture strain of the as-cast WTaMoNbTi RHEA was 7.8%,which was about 5.2 times that of the NbMoTaW alloy.The alloy exhibited a strong resistance to high-temperature softening,with a high yield strength of 173 MPa and compressive strength of 218 MPa at 1600℃.The WTaMoNbTi RHEA possessed excellent phase stability in the range of room temperature to 2000℃.The dendritic grains grew into equiaxed grains after compression test at 1600℃due to the dynamic recrystallization process at high temperature.This work presents a promising high-temperature structural material that can be applied at 1600℃.

关键词： Refractory high entropy alloy Mechanical property Phase stability Elevated temperature properties metals and alloys