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Comparative Study on the Microstructure and Mechanical Properties of Mg-Li-Al Based Alloys with yttrium and Strontium Addition

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Journal of Wuhan University of Technology(Materials Science) 2015年第3期30卷 626-630页

作者：许天才彭晓东 JIANG Junwei XIE Weidong CHEN Yuanfang ZHANG Xi College of Materials Science and Engineering Chongqing University National Engineering Research Center for Magnesium Alloys College of Materials Science and Engineering Chongqing University of Technology

The effects of yttrium and strontium on the microstructure and mechanical properties of Mg- 11Li-3A1 magnesium alloy （LA113） are compared and analyzed. Microstructures and phases of the alloys were studied with optical microscope （OM）, scanning electron microscope （SEM）, X-ray diffractometer （XRD） and energy dispersive spectrometer （EDS）. Mechanical properties of alloys were measured with tensile tester. The results show that yttrium and/or strontium additions produce a strong grain refining effect in LA113 alloy. AI2Y and AI4Sr, etc. phases with different morphologies are verified and exist inside the grain or at the grain boundaries, which directly impact on the mechanical properties of LA113 alloy. The results of tensile tests show that, the as-extruded LA113-1Y-1 Sr alloy obtains the optimal tensile property of which the tensile strength and elongation are 253.56 MPa and 18.12%, the tensile strength is increased by almost 25% compared with the as- extruded LA113 alloy.

关键词： Mg-Li-A1 alloy yttrium strontium microstructure mechanical properties

Experimental investigation and thermodynamic assessment of the yttrium-hydrogen binary system

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Progress in Natural Science:Materials International 2018年第3期28卷 332-336页

作者： Kai Fu Xiaojing Jiang Yanru Guo Shuan Li Jie Zheng Wenhuai Tian Xingguo Li Department of Materials Physics and Chemistry University of Science and Technology Beijing Beijing National Laboratory of Molecular Sciences State Key Laboratory of Rare Earth Materials Chemistry and ApplicationsCollege of Chemistry and Molecular EngineeringPeking University

A coupled experimental investigation and thermodynamic study of the yttrium-hydrogen(Y-H) binary system were carried out to provide more comprehensive and quantitative insights into the key thermodynamic properties of this system. Y-H system in the full range of H/Y = 0–3.0 was investigated by accurate pressure composition isotherm(PCI) measurement to provide credible phase equilibria information and thermodynamic *** phase boundaries obtained were in agreement with previous experimental data but with improved *** the guide of the crystal structures, all the solid phases were modelled using the three sublattice model. The Y-H phase diagram and thermodynamic parameters were calculated and assessed with the CALPHAD *** obtained results are in very good agreement with our experimental data and the published data reported in literature. The obtained thermodynamic database of Y-H system can be used to predict the hydrogenation behavior and decomposition temperatures of hydrides.

关键词： Rare earth yttrium Hydrogen Pressure composition isotherm Phase diagram Thermodynamics

Effect of yttrium on Aging Resistance of Zinc Alloy ZA-27

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Journal of Rare Earths 2003年第S1期21卷 177-181页

作者：李亚国刘海林胡宏剑段劲华 Physico-Chemical Test and Analysis Research Center of Guizhou Province

By metalloscopy,scanning electron microscope,X-ray diffraction,electron probe,salt water erosion and hot steam erosion,the microstructures and the aging resistance of zinc alloy ZA-27 with different contents of yttrium were studied. The results show that with optimum addition of yttrium in the alloy ZA-27 the fine YAl_3 phase forms. The fine YAl_3 granules can act as the condensation nuclei of α phase and the number of the α phase′s nuclei increases greatly and the growth of the nuclei comes in for restrict during the crystallization and the alloy′s grains become fine and the segregation reduces. In addition,yttrium also combines with zinc and the fine dispersion Y-Zn phase forms which improves grain boundary conditions and the alloy′s aging resistance. But when the content of yttrium is overmuch some YAl_3 granules grow to be lumpy,so the fine and close texture of the alloy′s boundaries is damaged and the proportion of the interface among the phases increase which brings a decline in the alloy′s resistance to corrosion.

关键词： zinc alloy ZA-27 yttrium aging resistance rare earths

Comments on“Hepatic radioembolization with yttrium-90 glass microspheres for treatment of primary liver cancer”by Cao et al,Chin Med J 1999;112:430-432

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Chinese Medical Journal 2001年第4期114卷 97-98页

作者： SHo WY Lau WT Leung Chinese Univ Hong Kong Prince Wales Hosp Dept Surg Shatin Hong Kong Peoples R China Chinese Univ Hong Kong Prince Wales Hosp Dept Clin Oncol Shatin Hong Kong Peoples R China

Editors,　　We would like to congratulate Cao and his colleagues on the extremely good mean survival rate of 19.5 months achieved in 17 patients with non-resectable liver cancer (16 primary and 1 metastatic).1　Because the results of their study sounds so promising, centres having access to glass yttrium-90 (90Y) microspheres may want to try their methods. It is therefore necessary to clarify some of the points mentioned in their report.

关键词： yttrium Comments on

Effects of yttrium and Cerium on Compression Properties of Ni_3Al-Base Alloys

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Journal of Rare Earths 1992年第1期10卷 44-48页

作者：李辉郭建亭孙超王淑荷谭明晖 Institute of Metal Research Academia SinicaShenyang 110015China

The effects of yttrium and cerium on the compression properties of Ni_3Al-base alloys have been *** results reveal that the addition of about 0.1 wt% Y to Ni_3Al-B alloy is effective for improving the ductility at 1100℃.A ductility increase of about 100% is observed for this Y doped *** yttrium re- fines grains of the *** YNi_5 phase is found to be precipitated on the grain boundaries in the alloy con- taining 0.3 wt% Yor *** about 0.1 wt% Ce to Ni_3Al-B-Cr-Zr alloy obviously improves the ductility of the alloy at 1100℃.A ductility increase of about 50% is obtained for this *** added cerium also pre- vents the formation of γ+γ' eutectic and refines *** bulk phase of CeNi_4 appeares at the front of the eutectic in the alloys containing 0.1 wt% Ce or more.

关键词： yttrium Cerium Compressive properties Ni_3Al CeNi_4

Influences of ceria and yttrium on properties of D127 surfacing electrode

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China Welding 2009年第4期18卷 67-70页

作者：郭永环范希营常彦伟王广丰 College of Mechanical and Electrical Engineering Xuzhou Normal University Xuzhou 221116.

The coating of D127, a surfacing electrode, was added ceria （ CeO2 ） and yttrium （Y） for possible enhanced electrode properties. The method of orthogonal test was adopted. The coating with different amount of CeO2 and Y was pressed. The hardness of surfacing layer was carried on by hardness tester, microstracture was investigated by metallograph, and the content of rare earths was analyzed by X-ray energy dispersive spectrometer. The results show that the of deposited metal can be effectively made fine,accordingly, the hardness and the wear-resistanee of deposited metal are also raised. But the addition amount of the rare-earth should be proper. The deposited metal microstructure is the finest and the most homogeneous when the addition amount of CeO2 is 2 wt.% and Y 1.2 wt.% , and the hardness of the surfacing layer is the highest.

关键词： ceria yttrium surfacing electrode grain refinement

Effects of yttrium on microstructure and mechanical properties of Mg-6Al magnesium alloy

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China Foundry 2010年第4期7卷 362-366页

作者： Ren Wenliang Li Quan＇an Li Jianhong Li Kejie Zhang Xingyuan School of Material Science and Engineering Henan University of Science and Technology Luoyang 471003 China School of Material Science and Engineering Xi＇an University of Technology Xi＇an 710048 China

Since Y has a great solid solubility in magnesium alloys, it helps enhancing the heat-resistant property of magnesium alloys. The effects of Y on microstructures and mechanical properties of Mg-6Al alloy have been studied in this work. The results show that Y addition refines grains of Mg-6Al alloy, and reduces the amount of the Mg 17 Al 12 phase. At the same time, the high melting-point Al 2 Y phase particles are formed. According to the mathematical model of the two-dimensional lattice misfit proposed by Braffit, it is believed that the Al 2 Y particles can serve as the nucleation sites for α-Mg. After T6 treatment, both elongation and ultimate tensile strength of Mg-6Al alloy at the room temperature and high-temperature increased firstly and then decreased, with increasing Y addition. The peak mechanical properties were achieved in the Mg-6Al-1.2Y alloy system. Y addition appears to change the fracture characteristic of Mg-6Al alloy. With 1.2wt%Y, the fracture surface of the alloy showed a lot of dimples and tearing ridges which connected the microscopic dimples and the fracture is mixed fracture of quasi-cleavage and ductile fracture.

关键词： yttrium Mg-6Al alloy microstructure mechanical properties

Effect of yttrium on microstructure and mold filling capacity of a near-α high temperature titanium alloy

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China Foundry 2012年第4期9卷 344-348页

作者： Zhao Ertuan Chen Yuyong Kong Fantao Zhang Changjiang Xiao Shulong National Key Laboratory for Precision Hot Processing of Metals Harbin Institute of TechnologyHarbin 150001China

The addition of rare earth yttrium(Y) can improve the performances of high temperature titanium alloys,such as the tensile ductility,thermal stability and creep property,***,few studies on the effect of Y on the castability of titanium alloys have been carried out,which is significant to fabrication of thin-walled complex titanium castings by investment *** this study,the microstructure and mold filling capacity of a Ti-1100 alloy with different Y additions(0,0.1wt.%,0.3wt.%,0.5wt.% and 1.0wt.%) were investigated systematically through investment casting experiments,and the casting experiments were carried out in a centrifugal titanium casting *** microstructures of the alloy were observed via the optical microscopy,scanning electron microscopy and transmission electron *** mold filling capacity was tested by using of a grid pattern and was evaluated by the number of segments completely filled by the cast *** results indicate that the grain size is decreased and the mold filling capacity is improved significantly with increasing the addition of Y from 0 to 1.0wt.%.The average primary grain size of Ti-1100 alloy is reduced from 250 μm to 50 μm and the mold filling capacity is increased from 61.5% to 100%.Considering the potential harmful effect on tensile properties of titanium alloys due to high concentrations of Y,it is suggested that Y addition should be about 0.3wt.%.

关键词： high temperature titanium alloy yttrium mold filling capacity investment casting

Effect of yttrium Implantation on Microstructure and Adhesive Property of Nickel Oxide Film

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Journal of Rare Earths 2007年第S1期25卷 537-540页

作者：靳惠明周小卫 Felix Adriana College of Mechanical Engineering Yangzhou University College of Materials Engineering National University of Antiuquia

Isothermal and cyclic oxidation behaviors of pure and yttrium-implanted nickel were studied at 1000 ℃ in the air. Scanning electronic microscopy (SEM) and transmission electronic microscopy (TEM) were used to examine the micro-morphology and structure of oxide scales formed on nickel substrate. It was found that Y-implantation greatly improved the anti-oxidation ability of nickel both in isothermal and cyclic oxidizing experiments. Laser Raman Microscopy was also used to study the stress status of oxide scales formed on nickel with and without yttrium. The main reason for the improvement in anti-oxidation of nickel was that Y-implantation greatly reduced the growing speed and grain size of NiO. This fine-grained NiO oxide film might have better high temperature plasticity and could relieve parts of compressive stress by means of creeping, and maintained ridge character and relatively lower internal stress level, hence remarkably enhanced the adhesion of protective NiO oxide scale formed on nickel substrate. The actual existing form of yttrium in oxide can be Y2O3 and NiY2O4 spinel nanometric particles, and even be Y3+ ions segregated at NiO grain boundaries.

关键词： ion implantation laser Raman stress yttrium NiO rare earths