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Cutting path-dependent machinability of SiCp/Al composite under multi-step ultra-precision diamond cutting

Chinese Journal of Aeronautics 2021年第4期34卷 241-252页

作者： Shijin LU Junjie ZHANG Zengqiang LI Jianguo ZHANG Xiaohui WANG Alexander HARTMAIER Jianfeng XU Yongda YAN Tao SUN Center for Precision Engineering Harbin Institute of TechnologyHarbin 150001China State Key Laboratory of Digital Manufacturing Equipment and Technology School of Mechanical Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China School of Mechanical Engineering University of JinanJinan 250022China Interdisciplinary Centre for Advanced Materials Simulation Ruhr-University BochumBochum 44780Germany

Particle-tool interactions,which govern the synergetic deformation of SiC particle reinforced Al matrix composites under mechanical machining,strongly depend on the geometry of particle position residing on cutting *** the present work,we investigate the influence of cutting path on the machinability of a SiCp/Al composite in multi-step ultra-precision diamond cutting by combining finite element simulations with experimental observations and *** consistent with experimentally characterized microstructures,the simulated SiCp/Al composite is considered to be composed of randomly distributed polygonally-shaped SiC particles with a volume fraction of 25 vol%.A multi-step cutting strategy with depths of cut ranging from 2 to 10 lm is adopted to achieve an ultimate depth of cut of 10 *** material parameters and extrinsic cutting conditions utilized in finite element simulations of SiCp/Al cutting are consistent with those used in corresponding *** results reveal different particle-tool interactions and failure modes of SiC particles,as well as their correlations with machining force evolution,residual stress distribution and machined surface topography.A detailed comparison between numerical simulation results and experimental data of multi-step diamond cutting of SiCp/Al composite reveals a substantial impact of the number of cutting steps on particle-tool interactions and machined surface *** findings provide guidelines for achieving high surface finish of SiCp/Al composites by ultra-precision diamond cutting.

关键词： Cutting path Diamond cutting Finite element simulation Particle-tool interaction SiCp/Al composites

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Penetration damaging behavior of TB17 titanium alloy 20th

Penetration damaging behavior of TB17 titanium alloy

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20th Chinese Materials Conference, CMC 2019

作者： Li, Jing Xin, Yunpeng Jiang, Tao Wang, Xinnan Zhu, Zhishou Beijing Institute of Aeronautical Materials Aviation Key Laboratory of Science and Technology on Advanced Titanium Alloys Beijing100095 China

ISBN: (纸本)9783035715668

The damage behavior of TB17 titanium alloy with ultra-high strength was studied by 12.7mm diameter armor piercing test. The damage characteristics and mechanism of damaging were analyzed by the observation of damage morphology of target board. The results indicated that the opening area was irregular at the opening stage, the internal wall turtle-shell-like or poly-porous, a few cracks and no adiabatic shear band was observed. The zone was parabolic at the penetrating stage, the internal wall was granular or river pattern, the adiabatic shear bands and fragments existed around the crater. A large number micro-pores and micro-cracks originating from the adiabatic shear bands expanded, forming macroscopic cracks. Finally, the target board fractured. © 2020 Trans Tech Publications Ltd, Switzerland.

关键词： Titanium alloys

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Study on product processing technology and mechanical property of TA2 Titanium Tube

Study on product processing technology and mechanical proper...

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3rd International Conference on Manufacture Engineering, Quality and Production System, ICMEQP 2014

作者： Ding, Xiao Ming Li, Yan Hao, Meng Yi Yao, Wang Beijing Institute of Aeronautical Materials Aviation Key Laboratory of Science and Technology on Advanced Titanium Alloys 100095 China University of Science and Technology Beijing 100083 China

ISBN: (纸本)9783038350910

Titanium alloy tube has been widely used in various industries due to its good corrosion resistance, small proportion and high intensity. In this research, TA2 Titanium Tube has been deeply processed under different rolling speeds and heat treatment. Through the experiments the following conclusions have been made: rolling speed has little effect on the TA2 tube properties;the tube with 485°C by 3min induction heat treatment after rolling could obtain 534MPa tensile strength, 406MPa yield strength and 30% elongation. As heat temperature increasing, the microstructure of the TA2 tube transfers from fiber to equiaxial structure;the surface stress of the tube is tensile stress and heat treatment can reduce the surface residual stress. © (2014) Trans Tech Publications, Switzerland.

关键词： Residual stresses

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Analysis of abnormal texture formation and strengthening mechanism in an extruded Mg-Gd-Y-Zn-Zr alloy

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Journal of Materials science & technology 2020年第10期42卷 133-145页

作者： Xueze Jin Wenchen Xu Zhongze Yang Can Yuan Debin Shan BugangTeng Bo Cheng Jin National Key Laboratory for Precision Hot Processing of Metals&School of Materials Science and Engineering Harbin Institute of TechnologyHarbin150001China Advanced Composites Simulation Lab University of Southern CaliforniaLos AngelesCA 90089-0241USA

A Mg-Gd-Y-Zn-Zr magnesium alloy with different initial states was extruded under different extrusion *** effect of solution treatment and extrusion parameters on the microstructure,texture and mechanical properties were analyzed in detail,and the abnormal texture formation and strengthening mechanism was *** extruded at low temperature and small extrusion ratio,the bimodal microstructure consisting of fine dynamically recrystallized grains and coarse deformed grains occurred both in the as-cast alloy and solution-treated *** the extrusion temperature and extrusion ratio were increased,the amount and size of dynamically recrystallized grains increased and the grain size of the solution-treated alloy showed higher growth ***,an abnormal texture with<0001>parallel with extrusion direction developed due to the occurrence of non-basal slip and continuous dynamic *** could be enhanced by solution treatment,high temperature,and large extrusion *** the as-cast alloy and solution-treated alloy exhibited the highest tensile strength after extrusion at 300℃with an extrusion ratio of *** refinement was the main strengthening mechanism utilized in both the as-cast alloy and the solution-treated *** hardening played an important role in the sample extruded at low temperature and small extrusion ratio,with the highest contribution of about 33 MPa after extrusion at 300℃with an extrusion ratio of *** strengthening contributed more in the sample extruded at high temperature and large extrusion ratio,but no more than 24.1 *** strengthening was another strengthening mechanism in the extruded as-cast alloy,especially at high temperature and large extrusion ratio(no more than 9 MPa).

关键词： Hot extrusion Heat treatment Abnormal texture Strengthening mechanism Quantitative analysis

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Feasibility study of NiCoCrFeAl0 .8 Si 0.1 (NbMoTaW) 0.1 denary alloy as a bond coat for thermal barrier coatings: from structural stability to high-temperature oxidation behavior

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Surface and Coatings technology 2025年 512卷

作者： Zhuo Chen Yongzhi Jing Chao Zhang Xiufang Cui Wei Xu Xiang Wang Yongchao Fang Dechang Ma Guo Jin Institute of Surface/Interface Science and Technology Key Laboratory of Superlight Material and Surface Technology of Ministry of Education College of Material Science and Chemical Engineering Harbin Engineering University Harbin 150001 China Northwest Institute for Nonferrous Metal Research Xi an 710016 China No.703 Research Institute China State Shipbuilding Co. Ltd. Harbin 150078 China The Military Industry Program Evaluation Center of Costind of SASTIND Beijing 100048 China Aviation Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Aviation Material Beijing Beijing Institute of Aeronautical Materials Beijing 100095 China

In this study, the feasibility of NiCoCrFeAl 0.8 Si 0.1 (NbMoTaW) 0.1 complex concentrated alloy as a bond coat for thermal barrier coatings (TBCs) was investigated. The alloy bond coat was prepared using plasma spraying technology and compared with the conventional NiCoCrAlY bond coat. The phase composition and microstructural changes of the NiCoCrFeAl 0.8 Si 0.1 (NbMoTaW) 0.1 alloy before and after plasma deposition were analyzed, and the thermal expansion coefficients, microhardness, and oxidation resistance of the two coatings were evaluated. Additionally, a Yttria-Stabilized Zirconia (YSZ) ceramic layer was deposited on the surfaces of both bond coats, forming a complete TBC system, and the evolution of the thermally grown oxide (TGO) layer was studied under different oxidation stages. Results indicate that after plasma spraying, the denary alloy bond coat maintains a single-phase BCC structure with slight compositional segregation, dense microstructure, and effective suppression of segregation of refractory elements due to its high aluminum content. The thermal expansion coefficient of the alloy is comparable to that of NiCoCrAlY, but its microhardness is nearly double that of NiCoCrAlY, with a more uniform hardness distribution. Oxidation testing at 1100 °C revealed that the TGO growth rate of the NiCoCrFeAl-based bond coat TBC is 36 % lower than that of the NiCoCrAlY-based system, demonstrating superior oxidation resistance. This improvement is attributed to the active elements such as Si, Nb, and Mo, which promote the formation of a protective Cr/Al dual-layer oxide film, effectively slowing down further oxidation, internal stress, and the formation of spinel. These findings suggest that the NiCoCrFeAl 0.8 Si 0.1 (NbMoTaW) 0.1 complex concentrated alloy has the potential to serve as a high-performance bond coat in TBC systems, providing superior oxidation resistance, thermal expansion matching, and mechanical integrity at high temperatures.

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Rare earth element Ce enables high thermoelectric performance in n-type SnSe polycrystals

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Journal of Materials science & technology 2023年第12期143卷 234-241页

作者： Shan Li Li Yin Yijie Liu Xiaodong Wang Chen Chen Qian Zhang School of Civil Aviation Northwestern Polytechnical UniversityXi’an 710072China School of Materials Science and Engineering and Institute of Materials Genome&Big DataHarbin Institute of TechnologyShenzhen 518055China State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China

SnSe exhibits excellent thermoelectric performance in both n-and p-type single crystals,but its n-type polycrystals are restricted because of the lower electrical ***,we dually introduced rare earth element Ce and PbTe to optimize the thermoelectric properties of n-type SnSe *** is demonstrated that Ce is an effective cationic dopant to convert SnSe from p-to n-type conductor,and an enhanced peak zT value of∼0.9 at 823 K was obtained in Sn 0.97 Ce 0.03 Se due to the improved power ***,PbTe alloying not only reduced the band gap to increase the carrier concentration,but also enhanced the density-of-states effective mass,and hence further increased the power factor in the whole measured temperature ***,the lattice thermal conductivity was significantly reduced owing to the enhanced phonon scattering by the mass and strain *** a result,the peak zT value was increased to∼1.3 for Sn 0.9 Pb 0.07 Ce 0.03 Se 0.93 Te 0.07 together with a high average zT value of∼0.52 in the temperature range of 300 to 823 K.

关键词： Thermoelectric N-type SnSe Ce doping PbTe alloying

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Control of Stray Currents in Pipeline System based on Melnikov Theory 36

Control of Stray Currents in Pipeline System based on Melnik...

引用

第36届中国控制会议

作者： Peng Wang Bohu Li Guoqiang Shi Junhua Zhou School of Automation Science and Electrical Engineering BeiHang University Beijing Complex Product Advanced Manufacturing Engineering Research Center Beijing Simulation Center State Key Laboratory of Intelligent Manufacturing System Technology Beijing Institute of Electronic System Science and Technology on Space System Simulation Laboratory Beijing Simulation Center

ISBN: (纸本)9781538629185

The pipeline network interfered by the stray currents has been verified to be a complex nonlinear dynamical *** paper shows that the chaotic characteristic could be utilized in the stray currents *** prove this,this paper establishes an equivalent chaotic control *** we analyze this model by using Melnikov method and find out the condition under which the chaotic phenomenon will be *** order to get a sufficient proof for identifying the conclusion,simulation experiments are used to verify the validity of the control method.

关键词： stray currents chaos control Melnikov

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Sign reversal and manipulation of anomalous Hall resistivity in facing-target sputtered Pt/Mn_(4)N bilayers

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Rare Metals 2023年第2期42卷 591-601页

作者： Ze-Yu Zhang Jia-Wei Jiang Xiao-Hui Shi Xiang Liu Xia Chen Zhi-Peng Hou Wen-Bo Mi Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparation Technology School of ScienceTianjin UniversityTianjin300354China School of Physics and Electronic Engineering Linyi UniversityLinyi276000China College of Science Civil Aviation University of ChinaTianjin300300China Guangdong Provincial Key Laboratory of Optical Information Materials and Technology&Institute for Advanced Materials South China Academy of Advanced OptoelectronicsSouth China Normal UniversityGuangzhou510006China

The magnetic and electronic transport properties manipulated by spin-orbit torque have been devoted much attention as they show a great promise for future spintronic ***,the spin dependent transport properties of the facing-target sputtered Pt/Mn_(4)N bilayers on MgO(001)substrates have been investigated *** Hall resistivity of Pt/Mn_(4)N bilayers is strongly dependent on temperature,applied current intensity,Mn_(4)N and Pt layer *** temperature-dependent sign reversal of anomalous Hall resistivity appears in Pt/Mn_(4)N bilayers,which is dominated by the competition between the magnetic proximity and spin Hall ***,the magnitude of anomalous Hall resistivity can be manipulated by applied current *** critical and saturation currents are related to Mn_(4)N and Pt layer ***,a Dzyaloshinskii-Moriya interaction coefficient(D)of 5.63 mJ·m^(-2)is calculated in Pt/Mn_(4)N/MgO *** details of the anomalous Hall effects in Pt/Mn_(4)N bilayers are helpful to understand the interfacial effects between heavy metals and ferrimagnets.

关键词： Pt/Mn_(4)N bilayer Hall resistivity Magnetic proximity effect Spin Hall effect(SHE) DzyaloshinskiiMoriya interaction(DMI)

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Morphological modifications of C60 crystal rods under hydrothermal conditions

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Chinese Physics B 2020年第12期29卷 506-510页

作者： Ming-Run Du Shi-Xin Liu Jia-Jun Dong Ze-Peng Li Ming-Chao Wang Tong Wei Qing-Jun Zhou Xiong Yang Peng-fei Shen College of Science Civil Aviation University of ChinaTianjin 300300China State Key Laboratory of Superhard Materials College of PhysicsJilin UniversityChangchun 130012China Academy for Advanced Interdisciplinary Studies Southern University of Science and TechnologyShenzhen 519055China

We observed morphological modification of rod-shaped C60 solvate crystals using a facile hydrothermal *** initial C60 rods were changed from smooth rods to rough rods,porous rods or pieces under different hydrothermal *** the hydrothermal treatment,the initial samples underwent a decomposition-recrystallization process,which can be tuned by the content of alcohol in the hydrothermal solution,thereby leading to modification of the morphological properties of the initial C60 *** addition,the rough and porous C60 rods prepared in our work exhibit excellent photoluminescence intensities that are approximately 7 and 3 times higher than those of pure C60 powders,*** results suggest that the hydrothermal method is a potential route for fabricating fullerene materials with controllable morphologies and novel functions.

关键词： fullerene crystals morphological modification porous materials hydrothermal method

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Fatigue Behavior of Thermal Barrier Coated DD6 Single Crystal Superalloy at 900 °C

Fatigue Behavior of Thermal Barrier Coated DD6 Single Crysta...

引用

Chinese Materials Conference, CMC 2018

作者： Dong, Jianmin Li, Jiarong Mu, Rende Tian, He Science and Technology on Advanced High Temperature Structural Materials Laboratory Beijing Institute of Aeronautical Materials Beijing100095 China Aviation Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Aviation Material Beijing Institute of Aeronautical Materials Beijing100095 China

ISBN: (纸本)9789811359439

Thermal barrier coatings (TBCs) were deposited on DD6 specimens with [001] orientation, and the TBCs coated DD6 specimens were exposed at 1150 °C for one hour. Then, both the TBCs coated and bared specimens were subjected to high-cycle fatigue (HCF) testing at 900 °C in ambient atmosphere. The results revealed that the HCF life decreased with increasing stress amplitude and the fatigue strength of the TBCs coated substrate was higher than that of the bared alloy. There are two main reasons for this phenomenon, one is because the coating can bear part of the load and make the specimens stronger and the other is the existence of residual compressive stresses. SEM and TEM were used to observe the microstructure near the fracture. For the TBCs coated alloy, many pores and cracks appeared at the bond coat after HCF test, and the fatigue cracks may be resulted from some of them. In the process of testing, the crack expanded to the substrate and propagated along {111} octahedral slip planes. © 2019, Springer Nature Singapore Pte Ltd.

关键词： Thermal barrier coatings

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