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Brazing diamond grits onto AA7075 aluminium alloy substrate with Ag–Cu–Ti filler alloy by laser heating

Chinese Journal of Aeronautics 2021年第6期34卷 67-78页

作者： Guoqin HUANG Yingda WANG Meiqin ZHANG Changcai CUI Zhen TONG Institute of Manufacturing Engineering Huaqiao UniversityXiamen 361021China Fujian Engineering Research Center of Intelligent Manufacturing for Britle Materials Xiamen 361021China National&Local Joint Engineering Research Centre for Intelligent Manufacturing Technology of Britle Material Products Huaqiao UniversityXiamen 361021China School of Mechanical and Automotive Engineering Xiamen University of TechnologyXiamen 361011China EPSRC Future Metrology Hub Centre for Precision TechnologiesUniversity of HuddersfieldHudersfield HDI 3DHUK

The brazing of diamond is a promising way to fabricate grinding wheels for efficient machining and precision *** work investigated the feasibility of bonding diamond grits onto Aluminium Alloy 7075(AA7075)substrate with a Ag–Cu–Ti filler alloy via laser fusion *** interfacial microstructures and the strength of the brazed diamond joints were *** cross-section of the brazed diamond joint consists of a molten filler alloy layer,a molten pool,a heat effect zone,a columnar crystal zone and an equiaxed crystal *** the interface of the filler alloy/substrate metal,microstructures observed possibly were Ag(s.s),Al(s.s),Tix Al,Al2 Cu and Mg intermetallic compounds.A layer of Ti C with a thickness of about 30–50 nm was found at the bonding interface of the diamond/filler *** averaged peak shear force of the brazed joints was found to be approximately 39.8 *** abrasion grinding test indicated that the diamond/AA7075 brazed joint was adequate for ***,the pulled-off of grit was found to be the primary failure of this type of brazed *** work broadened the brazing diamond technique and the range of applications of brazed diamond wheels for efficient grinding.

关键词： Ag–Cu–Ti filler alloy Aluminium alloy Brazing Diamond Fusion Interfacial microstructure laser heating

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laser heating and Infrared Thermography of Building Materials

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Journal of Building Construction and Planning Research 2021年第3期9卷 223-229页

作者： Aschalew Kassu Carlton Farley III Christina P. Tsoli Department of Mechanical Civil Engineering and Construction Management Alabama A & M University Huntsville AL USA Department of Physics Chemistry and Mathematics Alabama A & M University Huntsville AL USA Department of Chemistry National and Kapodistrian University Athens Greece

In this work, a 532 nm diode CW laser is used to heat samples used as building materials at a 1 meter standoff distance while using an FLIR (Forward-Looking Infrared) thermal camera to monitor and record the heating and then cooling of each sample after lasers are switched off. The data is then analyzed using FLIR proprietary software. Since the absorption spectra of materials are unique, using multiple lasers of different wavelengths to simultaneously shine onto the sample at different locations would give enough thermal data to successfully characterize the samples within a reasonable amount of time. The results are very promising for applications involving non-destructive detection and classification of materials.

关键词： Infrared Thermography NIR Thermal laser heating Remote Detection

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Spin Seebeck effect and spin Hall magnetoresistance in the Pt/Y_3Fe_5O_(12) heterostructure under laser-heating

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Chinese Physics B 2018年第11期27卷 310-315页

作者：王拴虎李刚王建元田颖异张洪瑞邹吕宽孙继荣金克新 Shaanxi Key Laboratory of Condensed Matter Structures and Properties School of Science Northwestern Polytechnical University Xi'an 710072 China Beijing National Laboratory for Condensed Matter and Institute of Physics Chinese Academy of Sciences Beijing 100190 China High Magnetic Field Laboratory Chinese Academy of Science Hefei 230031 China

In the previous study of longitudinal spin Seebeck effect（LSSE）, the thermal gradient was often generated by inserting the sample between the cool bath and the hot bath. For practical use, this method is too cumbersome to be easily integrated into modern electrical circuits. Since the laser can be easily focused into a small region, it will be more convenient and friendly to the integrated circuit. In this paper, we systematically investigate the LSSE and spin Hall magnetoresistance（SMR） of the Pt/Y_3 Fe_5 O_（12） heterostructure under focused laser-heating. We find that the extremely large voltage of inverse spin Hall effect（VISHE） can be obtained by reducing the diameter of laser or increasing the number of light ***, even under the illumination of the ultraviolet light which will excite the electron from the valence band to the conduction band in yttrium iron garnet（YIG）, the magnitude of SMR is nearly constant. It indicates that the spin transport behavior of the adjacent Pt is independent of the electron configuration of YIG. The laser-heating method to generate LSSE will be very promising for modern integrated electronic circuits and will promote the application of spin caloritronics in practice.

关键词： spin Seebeck effect spin Hall magnetoresistance laser heating yttrium iron garnet

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Pressure-induced structural transition and low-temperature recovery of sodium pentazolate

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Chinese Physics B 2023年第4期32卷 529-533页

作者：赵梓彤刘然郭琳琳刘爽隋明宏刘波姚震王鹏刘冰冰 State Key Laboratory of Superhard Materials College of PhysicsJilin UniversityChangchun 130012China

Pentazolate compounds have attracted extensive attention as high energy density *** synthesis and recovery of pentazolate compounds is of great importance for their potential ***,we report the synthesis of Pmn2_(1)-NaN_(5)and Pm-Na_(2)N_(5)through compressing and laser heating pure NaN_(3)at~60 *** decompression,the pressureinduced structural transition from Pmn2_(1)-NaN_(5)into Cm-NaN_(5)is observed in the pressure range of 14-23 GPa for the first *** cyclo-N_(5)^(-)can be traced down to 4.7 GPa at room temperature and recovered to ambient pressure under low temperature condition(up to 160 K).The Pm-Na_(2)N_(5)is suggested to decompose into the P4/mmm-NaN_(2)at 23 GPa,and be stable at ambient *** work provides insight into the high-pressure behaviors of pentazolate compounds and an alternative way to stabilize energetic polynitrogen compounds.

关键词： sodium pentazolate high pressure laser heating structural transition

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Effects of laser heat treatment on the fracture morphologies of X80 pipeline steel welded joints by stress corrosion

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International Journal of Minerals,Metallurgy and Materials 2014年第9期21卷 898-905页

作者： De-jun Kong Cun-dong Ye College of Mechanical Engineering Changzhou University

The surfaces of X80 pipeline steel welded joints were processed with a CO2 laser, and the effects of laser heat treatment （LHT） on H2S stress corrosion in the National Association of Corrosion Engineers （NACE） solution were analyzed by a slow strain rate test. The fracture morphologies and chemical components of corrosive products before and after LHT were analyzed by scanning electron microscopy and energy-dispersive spectroscopy, respectively, and the mechanism of LHT on stress corrosion cracking was discussed. Results showed that the fracture for welded joints was brittle in its original state, while it was transformed to a ductile fracture after LHT. The tendencies of hydrogen-induced corrosion were reduced, and the stress corrosion sensitivity index decreased from 35.2% to 25.3%, indicating that the stress corrosion resistance of X80 pipeline steel welded joints has been improved by LHT.

关键词： pipeline steel welded joints laser heating stress corrosion fracture morphology

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A novel intelligent adaptive control of laser-based ground thermal test

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Chinese Journal of Aeronautics 2016年第4期29卷 1018-1026页

作者： Gan Zhengtao Yu Gang Li Shaoxia He Xiuli Chen Ru Zheng Caiyun Ning Weijian Key Laboratory of Mechanics in Advanced Manufacturing Institute of Mechanics Chinese Academy of Sciences

laser heating technology is a type of potential and attractive space heat flux simulation technology, which is characterized by high heating rate, controlled spatial intensity distribution and rapid response. However, the controlled plant is nonlinear, time-varying and uncertainty when implementing the laser-based heat flux simulation. In this paper, a novel intelligent adaptive controller based on proportion-integration-differentiation (PID) type fuzzy logic is proposed to improve the performance of laser-based ground thermal test. The temperature range of thermal cycles is more than 200 K in many instances. In order to improve the adaptability of controller, output scaling factors are real time adjusted while the thermal test is underway. The initial values of scaling factors are optimized using a stochastic hybrid particle swarm optimization (H-PSO) algorithm. A validating system has been established in the laboratory. The performance of the proposed controller is evaluated through extensive experiments under different operating conditions (reference and load disturbance). The results show that the proposed adaptive controller performs remarkably better compared to the conventional PID (PID) controller and the conventional PID type fuzzy (F-PID) controller considering performance indicators of overshoot, settling time and steady state error for laser-based ground thermal test. It is a reliable tool for effective temperature control of laser-based ground thermal test. (C) 2016 Chinese Society of Aeronautics and Astronautics. Production and hosting by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license.

关键词： Adaptive control Fuzzy logic Ground thermal test laser heating Thermal control

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Raman spectroscopy study of in situ change in laser irradiated LiMn_2O_4

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Chinese Optics Letters 2012年第8期10卷 66-69页

作者：刘照军韩礼刚莫育俊 Department of Physics and Electronic Information Luoyang Normal College

A spinel LiMn2O4 is investigated via Raman spectroscopy at 514.5-nm excitation and X-ray diffraction. The dependence of Raman spectra on the different irradiated laser powers is determined and found to be different from that at 632.8-nm excitation. Based on our extensive analysis, our experimental results can be attributed to the laser heating effect, which reduces the Mn4＋ cation concentration in the local area. Consequently, the decrease in average Mn valence in the local area unavoidably induces the Jahn-Teller effect and local lattice distortion, which accounts for the evolution of the measured Raman spectra of spinel LiMn2O4.

关键词： Jahn Teller effect laser heating Manganese Manganese compounds Raman scattering Raman spectroscopy X ray diffraction

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laser Stimulated Shape Memory Polymer with Inclusion of Gold Nanorod—Effect of Aspect Ratio and Critical Role of On-resonance Irradiation

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Journal of Materials Science & Technology 2017年第8期33卷 869-873页

作者： Yanbo Yao Phong T.Hoang Tao Liu Shanghai Key Lab of Lightweight Composite Donghua University High-Performance Materials Institute Florida State University

Gold nanorods（AuNRs） are excellent photothermal agents to enable a variety of laser stimulated functional polymers. One key issue is to maximize the photothermal conversion efficiency of Au NRs. In this study, the light responsive AuNR/shape memory polymer（SMP） nanocomposites with inclusion of AuNRs of varied aspect ratios were prepared, characterized, and their laser irradiation induced bending behavior was investigated. The critical role of the on-resonance irradiation condition—a close match of the longitudinal plasmon resonance of the AuNR with the wavelength of the incident laser—has been *** allows for maximizing the photothermal conversion efficiency of AuNRs to result in the rapid and large deformation of the AuNR/SMP nanocomposites. For the Au NR/SMP nanocomposite films prepared under similar processing conditions, the close-to-resonance irradiation at a 1.27 W/cm^2 was able to induce a bending rate of 27？/s and maximum bending angle of 90.4？. In contrast, the off-resonance irradiation at a 1.89 W/cm^2 resulted in negligible response.

关键词： Shape memory effect Gold nanoparticle laser heating

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Preparation of solder pads by selective laser scanning

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Chinese Optics Letters 2009年第3期7卷 217-219页

作者：师文庆杨永强黄延禄卫国强郭炜 School of Mechanical & Automotive Engineering South China University of Technology College of Science Guangdong Ocean University

We propose a new laser preparation technique to solder Sn-Ag3.5-Cu0.7 on a copper clad laminate （CCL）. The experiment is conducted by selective laser heating and melting the thin solder layer and then preprinting it on CCL in order to form the matrix with solder pads. Through the analysis of macro morphology of the matrix with solder pads and microstructure of single pads, this technique is proved to be suitable for preparing solder pads and that the solder pads are of good mechanical properties. The results also reveal that high frequency laser pulse is beneficial to the formation of better solder pad, and that the 12-W fiber laser with a beam diameter of 0.030 mm can solder Sn-Ag3.5-Cu0.7 successfully on CCL at 500-kHz pulse frequency. The optimized parameters of laser soldering on CCL are as follows： the laser power is 12 W, the scanning speed is 1.0 mm/s, the beam diameter is 0.030 ram, the lead-free solder is Sn-Ag3.5-Cu0.7, and the laser pulse frequency is 500 kHz.

关键词： Architectural design Brazing Fiber lasers laser heating laser pulses lasers Lead Mechanical properties Photolithography Pulsed laser applications Scanning Welding

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laser-Heated Diamond-Anvil Cell (LHDAC) in Materials Science Research

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Journal of Materials Science & Technology 2003年第6期19卷 518-525页

作者： N.V.Chandra Shekar P.Ch.Sahu K.Govinda Rajan Materials Science Division Indira Gandhi Centre for Atomic Research Kalpakkam 603 102 Tamil Nadu IndiaMaterials Science Division Indira Gandhi Centre for Atomic Research Kalpakkam 603 102 Tamil Nadu IndiaMaterials Science Division Indira Gandhi Centre for Atomic Research Kalpakkam 603 102 Tamil Nadu India

laser-heated diamond-anvil cell (LHDAC) is emerging as the most suitable, economical and versatile tool for the measurement of a large spectrum of physical properties of materials under extreme pressure and temperature conditions. In this review, the recent developments in the instrumentation, pressure and temperature measurement techniques, results of experimental investigations from the literature were discussed. Also, the future scope of the technique in various avenues of science was explored.

关键词： laser heating Diamond-anvil cell High pressure-high temperature Materials synthesis,Melting phenomena Phase equilibria

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