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Multiplex intermetallic phases in a gravity die-cast Mg-6.0Zn-1.5Nd-0.5Zr(wt%) alloy

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Journal of Magnesium and Alloys 2022年第1期10卷 225-240页

作者： fanzhi meng Shuhui Lv Qiang Yang Xin Qiu Zixiang Yan Qian Duan Jian meng State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China School of Materials Science and Engineering Changchun University of Science and Technology130022China

Components and crystal structures of the intermetallic phases in a gravity die-cast Mg-6.0Zn-1.5Nd-0.5Zr(wt%)alloy were investigated using transmission electron microscopy.The results indicate that this alloy has multiple intermetallic phases and various inner faults.Totally,six eutectoid intermetallic phases,namely W(Mg Nd Zn_(3)),T(Mg_(39)Zn_(55)Nd_(6)),(Mg,Zr)Zn_(2),Z(Mg_(28)Zn_(65)Nd_(7)),H_(2)(Mg_(15)Zn_(70)Nd_(15)),and H1(Mg_(24)Zn_(64)Nd_(11)),were simultaneously observed at grain boundaries,and six precipitates(Z,Mg_(7)Zn_(3),T,Mg_(4)Zn_(7),β_(1)-Mg Zn_(2) and β_(2)-Mg Zn_(2))were found inα-Mg grains.Furthermore,faults like sub-grain boundaries,orientation domains(coherent with the same matching plane but with different orientations),stacking faults and twins were observed in the eutectoid intermetallic phases.Finally,some new orientation relationships between the known intermetallic phases were revealed.This paper can provide new insight into alloy design for Mg-Zn-RE(RE:rare earth)based alloys.

关键词： Magnesium alloys Intermetallic phase Structure Transmission electron microscopy(TEM) Orientation relationship

Porous silica synthesis out of coal fly ash with no residue generation and complete silicon separation

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Frontiers of Environmental Science & Engineering 2023年第9期17卷 197-208页

作者： Tongyao Ju Siyu Han fanzhi meng Li Lin Jinglin Li Kailun Chen Jianguo Jiang School of Environment Tsinghua UniversityBeijing 100084China

Ordered mesoporous silica materials exhibit enormous potential in industrial production.Since coal fly ash(CFA)is abundant in Si,it has become a green and promising way to utilize CFA by synthesizing porous silica materials.However,the stable crystalline structure of CFA limits the extraction of Si,and the residue is generated during the process of extracting Si.In this work,we proposed a no-residue method to synthesize ordered mesoporous silica out of CFA.Sodium carbonate(Na_(2)CO_(3))was used to reconstruct the crystals of the CFA,and the calcined mixture then directly reacted with the precipitators.This method combined the process of Si extraction and porous material synthesis.In this method,no residue was generated and the silicon in both amorphous and crystalline phases of CFA was fully utilized.By this method,the extraction efficiency of Si was increased from 31.75%to nearly 100%.The as-synthesized mesoporous silica had a highly-ordered pore structure with a space group of la-3d,a surface area of 663.87 m^(2)/g,a pore volume of 0.41 cm^(3)/g,and an average pore diameter of 2.73 nm.The mechanism of crystalline transformation and material structure formation were systematically studied.This method provides a new idea to dispose of CFA and synthesize porous silica materials.

关键词： Coal fly ash Alkali fusion Micro-/meso-porous Si Zeolite MCM-48 Crystalline transformation

Interfacial precipitation in{1012}twin boundaries of a Mg-Gd-Zn-Zr alloy

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Journal of Materials Science & Technology 2021年第34期93卷 103-109页

作者： Zixiang Yan Qiang Yang fanzhi meng Rui Ma Rirong Bao Xiaojuan Liu Jian meng Xin Qiu State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022PR China University of Science&Technology of China Hefei 230026PR China School of Materials Science and Engineering Changchun University of Science and Technology130022PR China Key Laboratory of Superlight Materials&Surface Technology Ministry of EducationHarbin Engineering UniversityHarbin 150001 PR China

Twinning and precipitation play important roles in deformation and strengthening of magnesium alloys.In this work,interfacial precipitation in{1012}twin boundaries(TBs)of a cold-stamped Mg-12Gd-1.2Zn-0.4Zr alloy was investigated using atomic-resolution high-angle annular dark-field scanning transmission electron microscopy.Extended periodic segregation of Gd+Zn atoms in the~86.2°{1012}TBs with basal-prismatic facets and in the symmetric tilting TBs(obviously>86.2°)frequently occurred,resulted in the formation of new interfacial phases,namelyβ_(TB)’having a monoclinic structure in the TBs with two segregation layers andβ_(TB) having a tetragonal structure in the TBs with three or more segregation layers.The formation ofβ_(TB) clearly accelerates peak-aging and improves the alloy’s strength.

关键词： Magnesium alloys Twinning Scanning/transmission electron microscopy(STEM) Segregation Interfacial precipitate

Microstructures and mechanical properties of a newly developed high-pressure die casting Mg-Zn-RE alloy

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Journal of Materials Science & Technology 2020年第18期52卷 174-184页

作者： Xiru Hua Qiang Yang Dongdong Zhang fanzhi meng Chong Chen Zihao You Jinghuai Zhang Shuhui Lv Jian meng Key Laboratory of Superlight Materials&Surface Technology Ministry of EducationHarbin Engineering UniversityHarbin150001China State Key Laboratory of Rare Earth Resources Utilization.Changchun Institute of Applied Chemistry Chinese Academy of SciencesChangchun130022China School of Materials Science and Engineering Changchun University of Science and TechnologyChangchun130022China

A newly developed Mg-4Zn-2La-3Y alloy with high strength was fabricated by high-pressure die casting method,and its microstructures were thoroughly studied using transmission electron microscopy.The results demonstrate that it owns fine grains and approximately highly interconnected intermetallic phase skeletons,and exhibits ultra-high strength at both room and high temperatures.Interestingly,the eutectic intermetallic skeleton of this alloys is consisted of numerous fine particles,which are mainly consisted of two intermetallic phases,namely W and Mg12RE.Multiple{101}twins and SFs were found in the Mg12RE phase while a few of SFs in the W phase.Additionally,minor long-period stacking ordered phase was observed in the eutectoid phase,and it probably nucleated on the Mg12RE phase following a certain OR as(0002)14H//(110)Mg12REand[1120]14H//[111]Mg12RE,or(0002)14H//(211)Mg12REand[1120]14H//[111]Mg12RE.This special intermetallic skeleton with many interfaces and planar faults can efficiently transfer dislocations across grain boundaries,and this is the key factor for the outstanding mechanical properties of the studied alloy.

关键词： Magnesium alloys High-pressure die casting(HPDC) Transmission electron microscopy(TEM) Intermetallic phase Mechanical properties

Long Short Term Memory Networks Based Anomaly Detection for KPIs

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Computers, Materials & Continua 2019年第8期61卷 829-847页

作者： Haiqi Zhu fanzhi meng Seungmin Rho Mohan Li Jianyu Wang Shaohui Liu Feng Jiang School of Computer Science and Technology Harbin Institute of TechnologyHarbin150000China Institute of Computer Application China Academy of Engineer PhysicsMianyang621900China Department of Software Sejong UniversitySeoulKorea Cyberspace Institute of Advanced Technology Guangzhou UniversityGuangzhou510006China

In real-world many internet-based service companies need to closely monitor large amounts of data in order to ensure stable operation of their business.However,anomaly detection for these data with various patterns and data quality has been a great challenge,especially without labels.In this paper,we adopt an anomaly detection algorithm based on Long Short-Term Memory(LSTM)Network in terms of reconstructing KPIs and predicting KPIs.They use the reconstruction error and prediction error respectively as the criteria for judging anomalies,and we test our method with real data from a company in the insurance industry and achieved good performance.

关键词： LSTM anomaly detection KPIs

Effects of samarium content on microstructure and mechanical properties of Mg–0.5Zn–0.5Zr alloy

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Journal of Materials Science & Technology 2019年第7期35卷 1368-1377页

作者： Kai Guan fanzhi meng Pengfei Qin Qiang Yang Dongdong Zhang Baishun Li Wei Sun Shuhui Lv Yuanding Huang Norbert Hort Jian meng State Key Laboratory of Rare Earth Resource Utilization. Changchun Institute of Applied Chemistry Chinese Academy of Science Changchun 130022 University of Science & Technology of China Hefei 230026China School of Materials Science and Engineering Changchun University of Science and TechnologyChangchun 130022China Key Laboratory of Superlight Material and Surface Technology Ministry of EducationCollege of Material Science and Chemical EngineeringHarbin Engineering UniversityHarbin 150001China MagIC-Magnesium Innovation Centre Helmholtz-Zentrum GeesthachtMax-Planck Strasse 121502CeesthachtGermany

Effects of samarium (Sm) content (0, 2.0, 3.5, 5.0, 6.5 wt%) on microstructure and mechanical proper-ties of Mg-0.5Zn-0.5 Zr alloy under as-cast and as-extruded states were thoroughly investigated. Results indicate that grains of the as-cast alloys are gradually refined as Sm content increases. The dominant intermetallic ph^se changes from Mg3Sm to Mg4iSm5 till Sm content exceeds 5.0 wt%. The dynami-cally precipitated intermetallic phase during hot-extrusion in dll Sm-containing alloys is Mg3Sm. The intermetallic particles induced by Sm addition could act as heterogeneous nucleation sites for dynamic recrystallization during hot extrusion. They promoted dynamic recrystallization via the particle stim-ulated nucleation mechanism, and resulted in weakening the basal texture in the as-extruded alloys. Sm addition can significantly enhance the strength of the as-extruded Mg-0.5Zn-0.5Zr alloy at room temperature, with the optimal dosage of 3.5 wt%. The optimal yield strength (YS) and ultimate tensile strength (UTS) are 368 MPa and 383 MPa, which were enhanced by approximately 23.1% and 20.8% com-pared with the Sm-free alloy, respectively. Based on microstructural analysis, the dominant strengthening mechanisms are revealed to be grain boundary strengthening and dispersion strengthening.

关键词： Magnesium alloys Samarium Transmission electron microscopy (TEM) Microstructure Mechanical properties

Dynamic changes of nutrient content in herbaceous peony seed

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Oil Crop Science 2020年第2期5卷 74-79页

作者： Qimo Qi Yu Li fanzhi meng Guangping Xing Jilei Zhou Xianfeng Guo Forestry College Shandong Agricultural UniversityShandong Provincial Research Center of Demonstration Engineering Technology for Urban and Rural LandscapeTaianChina Forest Seedling and Flower Station in Shandong Province JinanChina

Herbaceous peony is a promising oilseed crop.‘Hangshao’and‘Fenghuang Niepan’are two cultivars with high yield and oil content In this study,seed reserved nutrient of these two genotypes were investigated during seed development process.Results showed that‘Hangshao’and‘Fenghuang Niepan’matured approximately 85 d after flowering(DAF).The development p rocess could be divided into four stages:seed formation and enlargement stage(S1),seed inclusion and enrichment stage(S2),crude fat rapid accumulation stage(S3)and dehydration and color transition stage(S4).During this process,100-seed fresh weight(HFW)and 100-seed dry weight(HDW)increased,whereas water content(WC)decreased.HFW,HDW and WC for‘Hangshao’seed at 85 DAF were28.56 g,20.78 g and 37.50%respectively,whereas those for‘Fenghuang Niepan’seed were 27.2 g,19.78 g,and30.85%respectively.In terms of the primary metabolites measuring,soluble protein content was consistently low(only 2.24%-3.15%),while starch content was relatively high(5.60%-24.81%).They displayed a trend of gradual increasing in early stage,followed by rapid decline.Crude fat tended to accumulate continuously with a linear upward trend starting at 40 DAF,and its maximum level was reached at 85 DAF(27.57%for‘Hangshao’and29.57%for‘Fenghuang Niepan’).For the secondary metabolites determination,total phenols content was relatively steady,maintaining at 107.7-129.9 mg/g for both cultivars,while total flavonoids content varied within25.33-65.33 mg/g for‘Hangshao’and 24.33-52.37 mg/g for Tenghuang Niepan’.The maximum level for both cultivars occurred at 55 DAF.Furthermore,crude fat content was found to be highly correlated with WC by correlation analysis and linear regression model definition(P≤0.01 and r=0.954).Thus,WC was recommended for evaluating crude fat in peony seed.These findings could provide scientific reference for high-yielding production practice for oleaginous peony plant.

关键词： Crude fat Flavonoids Paeonia lactiflora Phenols Protein Seed development Starch

石榴石微波铁氧体/顺丁橡胶基弹性体的制备及其性能

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弹性体 2024年第2期34卷 59-62页

作者：张建诚卢平波沈启豪孟繁志宁波送变电建设有限公司浙江宁波315000 台州市集英农林科技有限公司浙江台州318000

以顺丁橡胶(BR)为基体,石榴石微波铁氧体(YIG)为改性组分,制备了YIG/BR复合弹性体。实验对复合弹性体的结构和微观面貌进行了表征,并分别对YIG含量和BR含量对复合弹性体的性能影响进行了探讨。结果表明,YIG含量对力学性能、硫化性能和... 详细信息

以顺丁橡胶(BR)为基体,石榴石微波铁氧体(YIG)为改性组分,制备了YIG/BR复合弹性体。实验对复合弹性体的结构和微观面貌进行了表征,并分别对YIG含量和BR含量对复合弹性体的性能影响进行了探讨。结果表明,YIG含量对力学性能、硫化性能和阻尼性能的影响作用显著,当其含量增大时,复合弹性体的拉伸强度和邵尔硬度上升,断裂伸长率先上升后下降,最低硫化转矩和最高硫化转矩上升,焦烧时间和硫化时间减小,拉伸恢复力和压缩恢复力上升。而BR含量对阻尼系数影响显著,复合弹性体的最大阻尼系数与BR含量呈正相关联系。

关键词：石榴石微波铁氧体顺丁橡胶复合弹性体阻尼性能

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智能型多功能油液监测分离控制技术研究应用

鞍钢技术 2024年第3期 69-72页

作者：沈强任佩剑陈晓楠王思成孟凡志曲晓东王健鞍钢股份有限公司热轧带钢厂辽宁鞍山114021 鞍钢股份有限公司辽宁鞍山114021

针对冶金行业中,特别是热轧企业较为恶劣的工作环境,液压、润滑系统极易进水并发生油液乳化的问题,提出了智能型多功能油液监测分离控制技术,并介绍了该技术的装置和原理。基于试用情况,通过采取调整循环过滤泵参数、优化循环过滤泵工... 详细信息

针对冶金行业中,特别是热轧企业较为恶劣的工作环境,液压、润滑系统极易进水并发生油液乳化的问题,提出了智能型多功能油液监测分离控制技术,并介绍了该技术的装置和原理。基于试用情况,通过采取调整循环过滤泵参数、优化循环过滤泵工作时间和加热温度、优化装置安装位置、安装分离滤芯和手动排除杂质等措施,有效解决了液压、润滑系统油液乳化问题,减少了液压冲击和系统泄漏现象,年均节约成本约530.56万元。

关键词：液压系统油液乳化泄漏自动检测