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The Enhanced Effect of Optical Emission from Laser Induced Breakdown Spectroscopy of an Al-li alloy in the Presence of Magnetic Field Confinement

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Plasma Science and Technology 2015年第8期17卷 687-692页

作者：刘平海然吴鼎肖青梅孙丽影丁洪斌 Key Laboratory of Materials Modification by Laser Ion and Electron BeamsChinese Ministry of EducationSchool of Physics and Optical Electronic TechnologyDalian University of Technology

In this paper, the influence of magnetic field strength on laser-induced breakdown spectroscopy （liBS） has been investigated for various pressures. The plasma plume was produced by employing Q-switch Nd：YAG laser ablation of an a1-li alloy operating at a 1064 nm wavelength. The results indicated that the liBS intensity of the a1 and li emission lines is boosted with an increase of magnetic strength. Typically, the intensity of the a11 and li I spectral emissions can be magnified by 1.5-3 times in a steady magnetic field of 1.1 T compared with the field-free case. Also, in this investigation we recorded time-resolved images of the laser-produced plume by employing a fast ICCD camera. The results show that the luminance of the plasma is enhanced and the time of persistence is increased significantly, and the plasma plume splits into two lobes in the presence of a magnetic field. The probable reason for the enhancement is the magnetic confinement effect which increases the number density of excited atoms and the population of species in a high energy state. In addition, the electron temperature and density are also augmented by the magnetic field compared to the field-free case.

关键词： liBS a1-li alloy magnetic confinement EAST device

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MICROSTRUCTURE-PROPERTY RELATIONSHIP OF Al-2.2li-2.5Cu-0.2Mg alloy

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Acta Metallurgica Sinica(English Letters) 1989年第6期2卷 391-397页

作者： ZHANG Yun ZHAO Hong’en YAO Daping GAO Guozhong CHEN Jizhi HU Zhuangqi Institute of Metal Research,Academia Sinica,Shenyang,China[Originally published in ACTA METALL SIN(CHINESE EDN)25(3)1989 pp a161—a167. Associate Professor,Institute of Metal Research,Academia Sinica,Shenyang,110015,China

The relationship among the microstructures,properties and the phase transformation in Al-2.2li-2.5Cu-0.2Mg alloy after various treatments have been studied by optical microscopy and TEM *** is verified that solution treated at 525℃ for 1h is saris- factory for this alloy in which all the alloying elements are dissolved in the α-Al matrix,and aging at 190℃ for 16 h is the peak-aged *** alloy subjected to treatment is strengthened only be T_1 *** overaged or underaged conditions,the alloy is strengthened by two phases,in this cases,the strengthening effect is smaller than that by one *** deformation prior to aging would develop the plasticity and do not decrease the strength of the experimental alloy.

关键词： a1-li alloy heat treatment structure property

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Electrochemical Formation of AI-li alloys by Codeposition of AI and li from liCI-KCI-AIF3 Melts at 853 K

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Chemical Research in Chinese Universities 2013年第2期29卷 324-328页

作者： SUN Yi ZHANG Mi-lin HAN Wei li Mei YANG Yu-sheng Key Laboratory of Superlight Materials and Surface Technology Ministry of Education College of Materials Science and Chemical Engineering Harbin Engineering University Harbin 150001 P. R. China

The electrochemical behavior of AI（III） ions was studied in molten liC1-KC1 melts on a molybdenum electrode. Cyclic voltammetry, chronopotentiometry and chronoamperometry were used to explore the deposition mechanism of a1 and li. Cyclic voltammetry expriment indicates that under potential deposition（UPD） of lithium on pre-deposited aluminium led to the formation of liquid a1-li alloys at 853 K. The diffusion coefficient of AI（III） ions at 853 K in liC1-KC1-AIF3（I%, mass fraction） melts was determined to be （2.79~0.05）x 10_5 cm2/s. Chronopotentio- grams and chronoamperograms demonstrate that the codeposition of AI（III） and li（I） ions formed a1-li alloys at ca- thodic current densities higher than -0.28 A/cm2 or cathodic potentials more negative than -2.20 V. X-Ray diffrac- tion（XRD） pattern indicates that a1-li alloys with different phases formed via galvanostatic electrolysis. Inductively coupled plasma（ICP） analyses of the samples obtained by electrolysis show that lithium and aluminium contents of a1-li alloys could be controlled by a1F3 concentration and current intensity.

关键词： Electrochemistry a1-li alloy Codeposition Cyclic voltammetry

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EFFECT OF Cu ON MICROSTRUCTURE AND PROPERTIES OF Al-li alloyS

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Acta Metallurgica Sinica(English Letters) 1990年第5期3卷 322-326页

作者： YAO Daping HU Zhuangqi li Yiyi ZHANG Yun SHI Changxu Institute of Metal Resarch,Shenyang,China Institute of Metal Research,Academia Sinica,Shenyang 110015,China

The aging precipitation structure and the properties of Al-li-Cu-Zr alloys with 3 different Cu/li ratios have been *** results show that the aging hardening of the alloys consists of two steps:The first is strengthened by δ′-phase(δ′+T_1 phase in alloy No.3),and the second by δ′+T_1 phase(δ′+T_1+θ′phase in alloy No.3).The plate of T_1-phase can absorb the li atoms from δ′ particles when the plate bumped into δ′-phase,and therefore, these δ′ phase particles become smaller and gradually *** strength and hardness increase with the increase of Cu/li ratio and cuases a decrease in *** crack mode would change from transgranular to *** is due to the precipitation of the equi- librium phases contained Cu at grain boundaries.

关键词： a1-li alloy aging hardening microstructure tensile properties

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