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Grain refining in weld metal using short-pulsed laser ablation during CW laser welding of 2024-T3 aluminum alloy

International Journal of Extreme Manufacturing 2019年第4期1卷 34-41页

作者： masaki kasuga Tomokazu Sano Akio Hirose Division of Materials and Manufacturing Science Graduate School of EngineeringOsaka University2-1 Yamada-okaSuitaOsaka 565-0871Japan

The 2024 aluminum alloy is used extensively in the aircraft and aerospace industries because of its excellent mechanical ***,the weldability of 2024 aluminum alloy is generally low because it contains a high number of solutes,such as copper(Cu),magnesium(Mg),and manganese(Mn),causing solidification *** high speed welding of 2024 aluminum alloy without the use of filler is achieved,the applicability of 2024 aluminum alloys will *** refining is one of the methods used to prevent solidification cracking in weld metal,although it has never been achieved for high-speed laser welding of 2024 aluminum alloy without ***,we propose a short-pulsed,laser-induced,grain-refining method during continuous wave laser welding without ***-on-plate welding was performed on a 2024-T3 aluminum alloy at a welding speed of 1 m min−1 with a single mode fiber laser at a wavelength of 1070 nm and power of 1 *** in and around the molten pool were irradiated with nanosecond laser pulses at a wavelength of 1064 nm,pulse width of 10 ns,and pulse energy of 430 *** grain-refinement effect was confirmed when laser pulses were irradiated on the molten *** grain-refinement region was formed in a semicircular shape along the solid–liquid *** of the vertical section indicate that the grain-refinement region reached a depth of 1 mm along the solid–liquid *** Vickers hardness test results demonstrated that the hardness increased as a result of grain refinement and that the progress of solidification cracking was suppressed in the grain refinement region.

关键词： 2024 aluminum alloy hot cracking laser welding grain refinement dendrite fragmentation short pulsed laser laser ablation

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Photophysical properties of heteroaromatic ring-fused(di)benzosiloles

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中国科学：化学 2012年第1期42卷 116-117页

作者： SHIMIZU masaki MOCHIDA Kenji KATOH masaki HIYAMA Tamejiro Department of Material Chemistry Graduate School of Engineering Kyoto University Kyoto University Katsura Nishikyo-ku Kyoto 615-8510 Japan Current address： Research ＆ Development Initiative Chuo University 1-13-27 Kasuga Bunkyo-ku Tokyo 112-8551 Japan

Benzosiloles fused to heterocycles such as thiophene,benzothiophene,and benzofuran,and indole-and benzosilole-fused dibenzosiloles were prepared by palladium-catalyzed intramolecular coupling of the corresponding 2-(arylsilyl)aryl triflates in good to high *** and crystal structures of 5,7-dihydro-5,5,7,7-tetrakis(1-methylethyl)bis[1]benzosilolo-[2,3-b:3',2'-d]thiophene,6-methyl-12,12-diisopropyl-12H-indololo[3,2-b][1]silafluorene,and 5,5,11,11-tetraisopropyl-5,11H-benzosi lolo[3,2-c]silafluorene were determined by X-ray diffraction *** UV absorption spectra of the(di)benzosilole derivatives in cyclohexane red-shifted when compared to 1,1-diisopropyldibenzosilole,indicating that replacing a benzene ring of dibenzosilole by the heterocycles as well as fusion of indole and benzosilole moieties onto dibenzosilole narrowed the HOMO-LUMO gaps of the π-conjugation *** thiophene-fused benzosiloles were faintly fluorescent in solution and in the solid state,whereas the dibenzosiloles exhibited luminescence with moderate and high quantum yields in cyclohexane and in microcrystals,*** other words,aggregation-induced emission was observed for the ***,5,5,11,11-tetraisopropyl-5,11H-benzosilolo[3,2-c]silafluorene in microcrystals exhibited violet fluorescence(λmax = 396 nm) with a quantum yield of *** functional theory(DFT) calculations of the prepared(di)benzosiloles were also performed.

关键词：杂环类光物理性质荧光量子产率环己烷衍生物 X射线衍射分析稠环密度泛函理论晶体结构

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Induction heating for desorption of surface contamination for high-repetition laser-driven carbon-ion acceleration

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Matter and Radiation at Extremes 2023年第5期8卷 19-25页

作者： Sadaoki Kojima Tatsuhiko Miyatake Hironao Sakaki Hiroyoshi Kuroki Yusuke Shimizu Hisanori Harada Norihiro Inoue Thanh Hung Dinh Masayasu Hata Noboru Hasegawa Michiaki Mori Masahiko Ishino Mamiko Nishiuchi Kotaro Kondo Masaharu Nishikino masaki Kando Toshiyuki Shirai Kiminori Kondo Kansai Institute for Photon Science National Institutes for Quantum Science and Technology(QST)8-1-7 UmemidaiKizugawaKyoto 619-0215Japan Interdisciplinary Graduate School of Engineering Sciences Kyushu University6-1Kasuga-KoenKasugaFukuoka 816-8580Japan Hitachi Zosen Corporation 7-89 Nanko-Kita 1-chomeSuminoe-kuOsaka 559-8559Japan Department of Accelerator and Medical Physics Institute for Radiological ScienceNational Institutes for Quantum Science and Technology(QST)4-9-1 AnagawaInage-kuChiba 263-8555Japan

This study reports the first experimental demonstration of surface contamination cleaning from a high-repetition supply of thin-tape targets for laser-driven carbon-ion *** adsorption of contaminants containing protons,mainly water vapor and hydrocarbons,on the surface of materials exposed to low vacuum(>10^(−3)Pa)suppresses carbon-ion *** newly developed contamination cleaner heats a 5-μm-thick nickel tape to over 400℃in 100 ms by induction *** the future,this heating method could be scaled to laserdriven carbon-ion acceleration at rates beyond 10 *** contaminant hydrogen is eliminated from the heated nickel surface,and a carbon source layer—derived from the contaminant carbon—is spontaneously formed by the catalytic effect of *** species of ions accelerated from the nickel film heated to various temperatures have been observed *** the nickel film is heated beyond∼150℃,the proton signal considerably decreases,with a remarkable increase in the number and energy of carbon *** Langmuir adsorption model adequately explains the temperature dependence of desorption and re-adsorption of the adsorbed molecules on a heated target surface,and the temperature required for proton-free carbon-ion acceleration can be estimated.

关键词： acceleration heated nickel

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Ultrarelativistic Fe plasma with GJ/cm^(3) energy density created by femtosecond laser pulses

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Matter and Radiation at Extremes 2024年第6期9卷 70-80页

作者： Mariya Alkhimova Igor Skobelev Tatiana Pikuz Sergey Ryazantsev Hironao Sakaki Alexander S.Pirozhkov Timur Zh.Esirkepov Akito Sagisaka Nicholas P.Dover Kotaro Kondo Koichi Ogura Yuji Fukuda Hiromitsu Kiriyama Keita Nishitani Sergey Pikuz masaki Kando Ryosuke Kodama Kiminori Kondo Mamiko Nishiuchi 无 Joint Institute for High Temperatures Russian Academy of SciencesMoscow 125412Russia National Research Nuclear University(MEPhI) Moscow 115409Russia Institute for Open and Transdisciplinary Research Initiatives Osaka University2-6 YamadaokaSuitaOsaka 565-0871Japan HB11 Energy Holdings Pty 11 Wyndora Ave.FreshwaterNew South Wales 2096Australia Kansai Institute for Photon Science(KPSI) National Institutes for Quantum Science and Technology(QST)8-1-7 UmemidaiKizugawaKyoto 619-0215Japan Interdisciplinary Graduate School of Engineering Sciences Kyushu University6-1 KasugakoenKasugaFukuoka 816-8580Japan

The generation of a plasma with an ultrahigh energy density of 1.2 GJ/cm^(3)(which corresponds to about 12 Gbar pressure) is investigated by irradiating thin stainless-steel foils with high-contrast femtosecond laser pulses with relativistic intensities of up to 10^(22) W/cm^(2).The plasma parameters are determined by X-ray *** results show that most of the laser energy is absorbed by the plasma at solid density,indicating that no pre-plasma is generated in the current experimental setup.

关键词： laser femtosecond energy

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