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Refining mechanism of yttrium on primary α-Al in semi-solid Al alloy

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Acta Metallurgica Sinica(English Letters) 2010年第4期23卷 277-284页

作者： Zheng LIU Yongmei HU Xiaomei LIU Faculty of Mechanical and Electronic Engineering Jiangxi University of Science and Technology Ganzhou 341000 China Jiangxi Nonferrous Metal Processing Engineering Research Center Ganzhou 341000 China Engineering Institute Jiangxi University of Science and Technology Ganzhou 341000 China

Semi-solid Al7Si0.3Mg alloy slurry, which is grain-refined by yttrium, is manufactured by low temperature pouring. The effects of grain-refined by yttrium on the morphology and the grain size of the primary α-Al in semi-solid Al7Si0.3Mg alloy are researched. The results indicate that semi-solid Al7Si0.3Mg alloy with particle-like and rosette-like primary α-Al can be prepared by low temperature pouring from liquid Al7Si0.3Mg alloy grain-refined by yttrium. The grain size and particle morphology of primary α-Al in Al7Si0.3Mg alloy are markedly improved by 0.5 wt pet Y. The refining mechanism of Y on the morphology and the grain size of the primary α-Al in semi-solid Al7Si0.3Mg alloy are delved.

关键词： Semi-solid yttrium Al7Si0.3Mg alloy Refining mechanism

Extraction and separation of yttrium from other rare earths in chloride medium by phosphorylcarboxylic acids

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Journal of Rare Earths 2022年第6期40卷 958-964,I0004页

作者： Guolong Wu Zhifeng Zhang Yanling Li Wuping Liao State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China University of Science and Technology of China Hefei 230026China Ganjiang Innovation Academy Chinese Academy of SciencesGanzhou 341000China

Two phosphorylcarboxylic acids,3-((bis(2-ethylhexyloxy))phosphoryl)propanoic acid(PPA) and 3-((bis(2-ethylhexyloxy))phosphoryl)-3-phenylpropanoic acid(PPPA),were synthesized for separating yttrium from other rare earths in the chloride feed of ion-adsorption type rare earth *** effect of the factors such as pH_(1/2),temperature,saponification degree and phase modifiers was *** separation efficiencies of PPA and PPPA are obviously better than the typical extractants such as sec-octylphenoxy acetic acid(CA-12) and naphthenic acid(NA).The extraction process of rare earths by PPA and PPPA is a cation exchanging reaction,which is similar to those of CA-12 and *** loaded rare earths in both PPA and PPPA systems can be effectively back-extracted by 0.5 mol/L HCl or higher concentration.A cascade extraction process for separating yttrium from other rare earths was developed using PPPA as the *** yttrium product with the purity of 97.20 wt% was obtained by 35 stages of extraction and 12 stages of scrubbing.

关键词： Phosphorylcarboxylic acids Extraction Separation yttrium Chloride Ion-adsorption type rare earth concentrate

Effects of yttrium and zirconium additions on inclusions and mechanical properties of a reduced activation ferritic/martensitic steel

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Journal of Iron and Steel Research International 2020年第2期27卷 197-207页

作者： Dong-ping Zhan Guo-xing Qiu Chang-sheng Li Min Qi Zhou-hua Jiang Hui-shu Zhang School of Metallurgy Northeastern UniversityShenyang 110819LiaoningChina State Key Laboratory of Rolling and Automation.Northeastern University Shenyang 110819LiaoningChina School of Metallurgy Engineering Liaoning Institute of Science and TechnologyBenxi 117004.LiaoningChina

The effects of two alloying elements,i.e.,yttrium(Y)and zirconium(Zr),on the inclusion,microstructure,tensile property and impact toughness of reduced activation ferritic/martensitic(RAFM)steel are *** size and number of particles were determined by optical microscopy,and the particle types were examined by scanning electron *** size of?20% and?85% of the inclusions lied in the range of 0.5-1.0μm and 0.5-3.0μm,*** Y-and Y-Zr-containing specimens,the density of the fine inclusions,with a size less than 0.5μm,was found to be 1.06×10^17 and 9.82×10^16 m^-*** specimens were normalized at 1323 K for 30 min and tempered at 923 and 1023 K for 90 min,resulting in the formation of tempered martensite with M23C6 carbides and MX ***-containing RAFM steel tempered at 923 K formed M23C6 carbides and nano-sized carbides with Zr,conferring superior strength balance and impact *** yield strength of alloy reached 695 MPa,and a low ductile-brittle transition temperature of 238 K was maintained.

关键词： 9Cr oxide-dispersion-strengthened steel Inclusion Mechanical property DBTT yttrium Zirconium

Leaching of lanthanide and yttrium from a Central Appalachian coal and the ashes obtained at 550-950℃

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Journal of Rare Earths 2022年第5期40卷 807-814,I0005页

作者： Ronghong Lin Yee Soong Bret H.Howard Murphy J.Keller Elliot A.Roth Ping Wang Evan J.Granite U.S.Department of Energy National Energy Technology Laboratory626 Cochrans Mill RoadP.O.Box 10940PittsburghPA15236United States Keylogic Systems.Pittsburgh PA15236United States

In this work,we investigated leaching of lanthanide and yttrium(REY) from a Central Appalachian coal and its ashes obtained at 550-950℃ with the main purpose of understanding the impact of ashing temperature on REY leachability in water,ammonium sulfate,and hydrochloric *** is found that the coal contains a negligible amount of water-soluble REY,less than 1% ion-exchangeable REY,and about 28% of HCl-soluble *** leads to dramatic changes in REY leachability in both ammonium sulfate and hydrochloric acid solutions,which is believed to be related to transformation and redistribution of organically-associated REY in coal during the ashing *** temperature significantly affects REY leaching from coal ashes;higher ashing temperature results in lower REY leachability in both *** minerals may play a significant role in changing the leachability of REY after *** addition,the results also suggest that the organic matter in the coal is relatively enriched in heavy REY.

关键词： Acid leaching Cation exchange Coal Coal ash Rare earth elements yttrium

Mechanisms of yttrium on the wettability,surface tension and interactions between Ni-20Co-20Cr-10Al-ξY alloys and MgO ceramics

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Journal of Materials Science & Technology 2021年第11期70卷 39-48页

作者： Jinpeng Li Huarui Zhang Ming Gao Qingling Li Weidong Bian Yongshuang Cui Tongxiang Tao Hu Zhang School of Materials Science and Engineering Beihang UniversityBeijing100191China China Aerospace Academy of Systems Science and Engineering Beijing100048China Qingdao Institute of New Material Technology of Beihang University Qingdao266000China

The mechanisms of Y on the wettability,surface tension,and interactions between the Ni-20 Co-20 Cr-10 Al-ξY alloys and MgO ceramics at 1873 K were investigated by sessile drop *** results of nonlinear fitting showed that the equilibrium contact angles and Y concentrations were approximately in accord with the log-normal distribution *** equilibrium contact angles changed from 101.5°to 140.5°with Y increasing from 0 wt.%to 1.23 wt.%.Cross-sectional microstructure observations revealed that the thermal dissociation of ceramics occurred and the released[O]atoms can react with Y to produce Y_(2)O_(3) reaction layer along three-phase interphase *** kinetics analyses indicated that surface tension of the melt droplets had been positively correlated with the Y concentrations,and it increased from 737.8–1045.1 mN/***,the pinning effect of the rough substrate surface on the three-phase line hindered the spreading of the liquid on *** change in total free energy of the alloys/ceramics system was considered as the key factor affecting the ***,the surface morphology and thermodynamic stability of ceramics also had some influence on the wettability.

关键词： yttrium Wettability Interfacial interaction Surface tension Three-phase line

A yttrium-containing high-temperature titanium alloy additively manufactured by selective electron beam melting

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Journal of Central South University 2015年第8期22卷 2857-2863页

作者：逯圣路汤慧萍马前洪权曾立英 D.H.StJohn School of Materials and Metallurgy Northeastern University State Key Laboratory of Porous Metal Materials (Northwest Institute for Nonferrous Metal Research) Centre for Advanced Materials Processing and Manufacturing School of Mechanical and Mining Engineering The University of Queensland Centre for Additive Manufacturing School of Aerospace Mechanical and Manufacturing EngineeringRMIT University

A yttrium-containing high-temperature titanium alloy(Ti-6Al-2.7Sn-4Zr-0.4Mo-0.45Si-0.1Y, mass fraction, %) has been additively manufactured using selective electron beam melting(SEBM). The resulting microstructure and textures were studied using scanning electron microscopy(SEM), transmission electron microscopy(TEM), X-ray diffraction(XRD) and electron backscattered diffraction(EBSD) and compared with the conventionally manufactured form. A notable distinct difference of microstructures is that additive manufacturing by SEBM enables homogeneous precipitation of fine Y2O3 dispersoids in the size range of 50-250 nm throughout the as-fabricated alloy, despite the presence of just trace levels of oxygen(7×10-4, mass fraction) and yttrium(10-3, mass fraction) in the alloy. In contrast, the conventionally manufactured alloy shows inhomogeneously distributed coarse Y2O3 precipitates, including cracked or debonded Y2O3 particles.

关键词： titanium alloys additive manufacturing rare earth elements yttrium selective electron beam melting

Effect of yttrium treatment on alumina inclusions in high carbon steel

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Journal of Iron and Steel Research International 2022年第4期29卷 655-664页

作者： Yi Wang Chang-rong Li Lin-zhu Wang Xing-qiang Xiong Lu Chen School of Materials and Metallurgy Guizhou UniversityGuiyang 550025GuizhouChina Guizhou Key Laboratory of Metallurgical Engineering and Process Energy Conservation Guiyang 550025GuizhouChina

Aluminum oxide inclusions in SWRS82B steel seriously affect the drawing performance of steel *** effects of different addition amounts of yttrium(within the range of 0%–0.026%)on the composition,morphology,size and spacing of aluminum oxide inclusions were studied by scanning electron microscopy and energy spectrum *** on classical thermodynamics and FactSage software,the predominance diagram of inclusions in Fe–O–S–Y system and the effect of the addition of rare earth yttrium on the stability of alumina inclusions were *** results showed that molten steel was modified by adding the rare earth element *** can be inferred that the approximate route of target inclusion modification was:Al_(2)O_(3)→Y_(2)S_(3)+YAlO_(3)+Al_(2)O_(3)→Y_(2)S_(3)+YAlO_(3)+Y_(2)O_(2)S+YAlO_(3)+Al_(2)O_(3)→Y_(2)S_(3)+Y_(2)O_(2)*** experimental samples with 0.026%added yttrium had the best inclusion characteristics,in which the inclusion surface density distribution was uniform,and the interfacial distance between inclusions was mainly in the range of 100–500μ*** modification,the average inclusion size in molten steel was reduced by 6.9–8.6μ*** mechanism of yttrium modification was discussed based on actual calculation results and experimental results.

关键词： yttrium treatment Modification of aluminum inclusions Inclusion evolution Thermodynamics

Unveiling the mechanism of yttrium significantly improving high-temperature oxidation resistance of super-austenitic stainless steel S32654

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Journal of Materials Science & Technology 2022年第20期115卷 103-114页

作者： Shucai Zhang Huabing Li Zhouhua Jiang Hao Feng Zhejian Wen Junyu Ren Peide Han School of Metallurgy Northeastern UniversityShenyang 110819China Key Laboratory for Ecological Metallurgy of Multimetallic Ores(Ministry of Education) Shenyang 110819China College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China

Aiming at serious catastrophic oxidation problem of super-austenitic stainless steel S32654,the influence of different rare earth elements on its oxidation behavior was comparatively investigated at 1200℃.The mechanism of Y significantly improving high-temperature oxidation resistance of S32654 was *** results demonstrated that Y played much better beneficial roles than Ce and La in the initial formation of oxide layer:(1)Y promoted Cr segregation to steel surface to combine with O;(2)its preferential oxidation provided nucleation cores for Cr_(2)O_(3).Both roles jointly promoted the selective oxidation of Cr and then the formation of protective Cr-rich oxide *** provided good prerequisites for inhibiting the formation and volatilization of MoO_(3).Additionally,Y cation segregation to oxide grain boundaries further promoted the selective oxidation of Cr and Si to form more protective oxide *** beneficial roles of Y essentially eliminated the synergistic effects of MoO_(3) volatilization and lamellar Cr_(2)N precipitation on catastrophic ***,the oxidation resistance of Y-bearing S32654 was improved by 22%–45%.

关键词： Super-austenitic stainless steel Rare earth elements yttrium Oxidation MoO_(3)volatilization Cr_(2)N precipitation

Effect of yttrium on the mechanical and magnetostrictive properties of Fe_(83)Ga_(17) alloy

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Journal of Rare Earths 2015年第10期33卷 1087-1092页

作者：李纪恒肖锡铭袁超高学绪包小倩 State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing

Polycrystalline rod samples of （Fe83Ga17）100-xYx （x=0, 0.16, 0.32, 0.48, 0.64） were prepared by induction melting under argon atmosphere. Effect of yttrium on the mechanical and magnetostrictive properties of Fe83Ga17 alloy was investigated. Small amount of yttrium （0.16 at.%） increased the tensile strength of as-cast Fe83Ga17 alloys to 674 MPa and improved the ductility with elongation of 4.2% at room temperature. The Y2Fe17-xGax （6≤x≤7） phase was formed in the Y-doped Fe83Gax7 alloy since yttrium was hardly dissolved into the a-Fe lattice. Y2（FeGa）17 secondary phase dispersed along the grain boundaries and inside the grains played an important role for the enhancement of mechanical property. The 0.64 at.% Y-doped alloy had magnetostriction of 133 ppm, which was thought to be associated with the alteration of the grain shape and 〈 100〉 preferential orientation along the axial direction of rods.

关键词： yttrium Fe-Ga alloy magnetostriction mechanical property rare earths