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Formation of primary intermetallic phases in the interaction of Fe-containing melts of recycled Al-Si alloys with Al_(2)O_(3)and Al_(2)O_(3)-C filter materials:Aμ-CT study

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Journal of Materials Science & Technology 2024年第17期184卷 88-100页

作者： H.Becker B.Fankhänel A.Charitos S.Baier-Stegmaier A.Leineweber W.Pantleon Institute of Materials Science TU Bergakademie FreibergGustav-Zeuner-Straße 509599 FreibergGermany Institute of Nonferrous Metallurgy and Purest Materials TU Bergakademie FreibergLeipziger Straße 3409599 FreibergGermany Department of Physics Technical Univeristy of DenmarkFysikvej 3102800 Kgs.LyngbyDenmark Department of Civil and Mechanical Engineering Technical Univeristy of DenmarkProduktionstorvet 4252800 Kgs.LyngbyDenmark

Fe is the most detrimental impurity element in recycled Al-Si alloys due to the formation of brittle,primary,Fe-containing,intermetallic particles during *** removal from the Al-Si melts *** filtration can reduce the Fe *** active filter materials can facilitate the formation of these particles for their removal and contribute to the production of high-quality,recycled Al-Si *** interaction of the alloy with the filter material can lead to modification of the thermodynamics of the alloy or of the kinetics of the particle ***-resolved,three-dimensional microstructural inves-tigations have been carried out to study the formation of primary intermetallic particles in Al7.1Si1.5Fe and Al7.1Si0.75Fe0.75Mn alloy melts in contact with Al_(2)O_(3)and Al_(2)O_(3)-C filter substrate material during a melt conditioning treatment at 620°*** microstructures,in particular the primary intermetallic particlesαc andαh,have been characterized by computed tomography(CT)and supplementary scanning electron microscopy(SEM).As expected by thermodynamics,the total volume fraction of primary par-ticles remains unchanged by the interaction with the substrate ***,kinetic advantages for Fe-removal efficiency can be achieved by an accelerated and preferred selective particle formation in contact with the Al_(2)O_(3)-C ***,particle formation is discussed in view of its different stages:nucleation,growth,and ripening.

关键词： Aluminum alloys intermetallic phases Solidification X-ray computed tomography Scanning electron microscopy

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Electrocatalytic oxygen reduction performances of surface Ag granular packs electrodeposited from dual-phase Ag_(35.5)Zn_(64.5) precursor alloys by triangle wave potential cycling

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Rare Metals 2021年第12期40卷 3531-3542页

作者： Jia-Yu Luo Piao-Piao Han Zhen-Hua Dan Tao Tang Feng-Xiang Qin Hui Chang Lian Zhou College of Materials Science and Engineering and Tech Institute for Advanced Materials Nanjing Tech UniversityNanjing 210009China State Key Laboratory of Advanced Metals and Materials University of Science and Technology BeijingBeijing 110083China School of Materials Science and Engineering Nanjing University of Science and TechnologyNanjing 210094China

Surface Ag granular packs(SAgPs) have been fabricated from dual-phase Ag_(35.5)Zn_(64.5) precursor alloy consisting of both e and c phases by using a facile one-step triangle wave potential cycling in 0.5 mol·L^(-1) *** the continuous potential cyclic sweeping, the c phases preferentially dissolve during the anodic scan and dominant reduction reactions of Ag cations lead to redeposition and accumulation of Ag atoms together to form SAg Ps during cathodic scan. The e phases stay inactive to form a continuous skeleton in the inner regions. SAg Ps with an average particle size of 94-129 nm can be obtained at scan rates of 25, 50 and 100 mV·s^(-1) for 100 triangle wave potential cycles. SAgPs formed at a scan rate of 50 mV·s^(-1) exhibit superior oxygen reduction reaction performances with the onset potential of 0.93 V, half-wave potential of 0.72 V and an electron transfer number of *** above-mentioned SAgPs have superior stabilities as ORR catalysts.

关键词： Surface Ag granular packs Dual-phase Ag_(35.5)Zn_(64.5)precursor alloy Triangle wave potential cycling Oxygen reduction reaction catalysts Selective dissolution intermetallic phases

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Enhanced oxidation and overheating resistance of the extruded Mg–Zn–Al–Mn magnesium alloy by Calcium addition

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Journal of Magnesium and Alloys 2023年第4期11卷 1276-1291页

作者： Hanieh Yeganeh Ahmad Bahmani Mehrab Lotfpour Mehdi Malekan Masoud Emamy Behzad Nayebi Kwang Seon Shin School of Metallurgy and Materials Engineering College of EngineeringUniversity of TehranP.O.Box 11155-4563TehranIran Department of Advanced Materials and Renewable Energies Iranian Research Organization for Science and TechnologyTehranIran Department of Mechanical Engineering University of NevadaRenoRenoNV 89557USA Advanced Research and Technology of Magnesium(ARTofMag)Co. TehranIran Research Institute of Advanced Materials School of Materials Science and EngineeringSeoul National UniversityGwanak-guSeoul 08826Republic of Korea

The effects of Ca addition on the microstructure and oxidation properties of a new Mg alloy were *** oxidation behavior of the alloys was analyzed by thermal analysis and material characterization of the alloys exposed in flame environment;and both electrical and induction ***,the surface layers were characterized using field emission scanning electron microscopy,and X-ray diffraction *** was found that increasing the Ca addition reduces the grain size and increases the fraction of the secondary phases,and enhances the mechanical ***,increasing the Ca contents resulted in the formation of a dense CaO/MgO layer on the surface prohibited the oxygen diffusion and assisted in protection of the substrate against further ***,ignition temperature was increased from 680℃ to 890℃ after addition of the Ca *** mechanical properties and ignition behavior of the current materials was compared with the literature which it showed an excellent combination of the properties in the developed alloys.

关键词： Mg alloys Oxidation properties Ca addition Microstructure intermetallic phases

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Horizontally Solidified Al-3 wt%Cu-(0.5 wt%Mg)Alloys:Tailoring Thermal Parameters,Microstructure,Microhardness,and Corrosion Behavior

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Acta Metallurgica Sinica(English Letters) 2019年第6期32卷 695-709页

作者： Andre Barros Clarissa Cruz Adrina P.Silva Noe Cheung Amauri Garcia Otavio Rocha Antonio Moreira Institute of Technology Federal University of Para-UFPABelemPA 66075-110Brazil Federal Institute of Education Science and Technology of Para-IFPABelemPA 66093-020Brazil Department of Manufacturing and Materials Engineering University of Campinas-UNICAMPCampinasSP 13083-860Brazil

In the present experimental investigation,Al–3 wt%Cu and Al–3 wt%Cu–0.5 wt%Mg alloys castings are produced by a horizontal solidification technique with a view to examining the interrelationship among growth rate(GR),cooling rate(CR),secondary dendrite arm spacing(λ2),Vickers microhardness(HV),and corrosion behavior in a 0.5 M NaCl *** intermetallic phases of the as-solidified microstructures,that is,h-Al2Cu,S–Al2CuMg,and x-Al7Cu2 Fe,are subjected to a comprehensive characterization by using calculations provided by computational thermodynamics software,optical microscopy,and scanning electron microscopy/energy-dispersive ***,electrochemical impedance spectroscopy and potentiodynamic polarization tests have been applied to analyze the corrosion performance of samples of both alloys ***–Petch-type equations are proposed to represent the HV dependence onλ*** is shown that the addition of Mg to the Al–Cu alloy has led to a considerable increase in HV;however,the Al–Cu binary alloy is shown to have lower corrosion current density(icorr)as well as higher polarization resistance as compared to the corresponding results of the Al–Cu–Mg ternary alloy.

关键词： Aluminum alloys Solidification Dendritic microstructure intermetallic phases Microhardness Corrosion resistance

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A new high-pressure die casting Mg-Gd-Sm-Al alloy with high strength-ductility synergy

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Journal of Rare Earths 2024年第12期42卷 2239-2248页

作者： Shuhui Lv Youwei Cheng Bo Deng Tao Xu Xin Qiu Qiang Yang School of Materials Science and Engineering Changchun University of Science and Technology State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied Chemistry Chinese Academy of Sciences Kashui International Holdings Limited

A high-pressure die casting（HPDC） Mg-5Gd-1.5Sm-0.7Al alloy was newly developed and exhibits outstanding strength-ductility synergy, with the yield strength and the tensile elongation to fracture being approximately 200 MPa and 8.5%, respectively. This alloy has two types of a-Mg grains: coarse a1-Mg(（46 ± 18） μm) and fine a2-Mg(（9.2 ± 2.3） μm) grains, and various Al-GS（GS = Gd and Sm） particles located at grain boundaries while clear solute-atom segregation near grain boundaries with limited or free intermetallic particles. Characterizations using Cs-corrected high-angle annular dark-field scanning transmission electron microscopy（HAADF-STEM） indicate the crystal structures of Al-GS phases. After aging, dense β'precipitates and chain-shaped β''-like structures precipitated near grain boundaries while a high density of ultrafine β''-（Mg,Al）3Sm precipitates and Al-GS clusters formed in grain center. Relatively fine grains, Al-GS primary particles, solute-atom segregation near grain boundaries, and/or multiple precipitates contribute to the high strength of the studied alloy, while the multi-scale a-Mg grains,variety of intermetallic particles but discontinuous skeleton, and the multi-typed precipitated lead to its satisfactory ductility.

关键词： magnesium alloys strength-ductility synergy intermetallic phases scanning/transmission electron microscopy (STEM) precipitate rare earths

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Characterization of phases in an As-cast Copper-Manganese-Aluminum Alloy

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Journal of Materials Science & Technology 2006年第6期22卷 779-784页

作者： J.Iqbal F.Hasan F.Ahmad Department of Metallurgical and Materials Engineering University of Engineering and TechnologyLahorePakistan

Copper-manganese-aluminum （CMA） alloys, containing small additions of Fe, Ni, and Si, exhibit good strength and remarkable corrosion resistance against sea water. The alloys are used in as-cast condition, and their microstructure can show wide variations. The morphology, crystallography and composition of the phases presented in an as-cast （CMA） alloy of nominal composition Cu-14%Mn-8%Al-3%Fe-2%Ni were investigated using optical, electron optical, and microprobe analytical techniques. The as-cast microstructure consisted of the grains of fcc α and bcc β-phases alongwith intermetallic precipitates of various morphologies. The room temperature microstructure exhibited four different types of precipitates inside the α-grains： the ＇large＇ dendritic-shaped particles and the cuboid-shaped precipitates, which were rich in Fe and Mn and had an fcc structure, while the ＇small＇ dendritic-shaped particles and the globular precipitates were based on FeaAI and had DO3 structure. These four different morphologies of intermetallic precipitates exhibited discrete orientation-relationships with the α-matrix. The β-grains only contained very small cuboid shaped precipitates, which could only be resolved through transmission electron microscopy. These precipitates were found to be based on Fe3Al and had the DO3 structure.

关键词： Orientation relationship DO3 structure intermetallic phases

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Preliminary study of microstructure, mechanical properties and corrosion resistance of antibacterial Ti-15Zr-xCu alloy for dental application

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Journal of Materials Science & Technology 2020年第15期47卷 31-43页

作者： Sharafadeen Kunle Kolawole Wang Hai Shuyuan Zhang Ziqing Sun Muhammad Ali Siddiqui Ihsan Ullah Wei Song Frank Witte Ke Yang School of Materials Science and Engineering University of Science and Technology of ChinaHefei230026China Institute of Metal Research Chinese Academy of SciencesShenyang110016China Department of Prosthodontics Geriatric Dentistry and Craniomandibular DisordersAssmannshauser Strane 4-614197BerlinGermany Federal Polytechnic OffaP.M.B.420OffaKwara StateNigeria

Ti-15 Zr-xCu(3≤x≤7,wt.%) novel antibacterial and antibiofilm alloys with competitive mechanical properties,biological responses and corrosion resistance were designed and *** heat treatment on Ti-15 Zr-7 Cu(TZC-7 A),after holding for 2 h at slightly above their beta transus temperature(BTT) ensured their tensile strength(UTS),yield strength(YS) and hardness(HRV) were improved by31.2%,20% and 12.3% respectively compared to the control without Cu,Ti-15 Zr(T-15 ZA).Although the3 wt.% Cu alloy displayed the highest elongation(26%),the TZC-7 A alloy also possessed a good *** of evenly dispersed Ti2 Cu and Zr2 Cu Cu-rich intermetallic phases formed as interwoven and alternating lamellae within the α+β matrix as a result of Cu addition,as revealed by X-ray diffraction(XRD),scanning electron microscopy(SEM) and transmission electron microscopy(TEM).These greatly contributed to their strengthening and bactericidal *** 98% antibacterial effect against *** and *** have been imparted,coupled with excellent biofilm *** polarization curves showed that the TZC-7 A alloy possessed higher corrosion resistance than commercially pure titanium,cp-Ti;contact angle test revealed enhanced hydrophilicity;while confocal laser scanning microscopy(CLSM) and cell counting kit(CCK-8) assays also displayed drastically lowered bacterial adhesion rate with comparatively no *** attachment on all alloys was similar but the best spread was obtained on TZC-7 A after 24 *** developed alloy has good potential as an antibacterial implant material with combination of optimized properties.

关键词： Ti-Zr alloy Cu addition Antibacterial Mechanical properties intermetallic phases

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Structure of Interphase Boundaries in Bimetallic Thin Films

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Journal of Materials Science & Technology 2001年第1期17卷 59-60页

作者： M.D.Starostenkov G.M.Poletayev D.M.Starostenkov General Physics Department Altai State Technical UniversityBarnaulRussia

The structural transformation in thin films of bimetals in the dependence on temperature and concentration of vacancies was investigated. The system Ni-Al structural transformation was realized by computer design according to the mechanism of self-sustained high(temperature synthesis. Structural transformation is characterized by the presence of dislocations, clusters of point defects and germs of intermetallic phases near interphase boundaries.

关键词： structural transformation intermetallic phases thin films

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Thermodynamic reassessment of Ga-Hg and Mg-Hg systems

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Journal of Central South University 2009年第1期16卷 32-37页

作者：冯艳王日初彭超群刘华山 School of Materials Science and Engineering Central South University

The Ga-Hg binary system was thermodynamically assessed by the CALPHAD method, but only configuration contributions were considered to the entropy of the liquid. The Mg-Hg binary system has not been assessed yet. In the assessments of the Ga-Hg and Mg-Hg binary systems, solutions including liquid and hcp (Mg) were treated as substitution solutions, of which the excess Gibbs energies were formulated with the Relich-Kister polynomial. The intermetallic phases in the Mg-Hg binary system, Mg3Hg, Mg5Hg2, Mg2Hg, Mg5Hg3, MgHg, and MgHg2, were described as stoichiometric compounds. Based on the reported experimental data and thermodynamic properties of the phase diagram, sets of self-consistent parameters describing all phases in the Ga-Hg and the Mg-Hg binary systems were obtained.

关键词： Ga-Hg system Mg-Hg system intermetallic phases thermodynamic assessment phase diagram CALPHAD

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intermetallic phase formation and evolution during homogenization and solution in Al-Zn-Mg-Cu alloys

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Science China(Technological Sciences) 2013年第11期56卷 2827-2838页

作者： LI ChunMei CHEN ZhiQian ZENG SuMin CHENG NanPu CHEN TianXiao School of Materials Science and Engineering Central South University School of Materials Science and Engineering Southwest University

The effects of major alloy element contents of Zn, Mg, Cu in Al-Zn-Mg-Cu alloys on the formation and evolution of intermetallic phases during casting, homogenization and solution treatment have been investigated through using X-ray diffraction, scanning electron microscopy and differential scanning calorimetry. Experimental results showed that a relatively higher Zn content with lower Mg and Cu contents was beneficial to the formation of MgZn2 phase instead of the A12CuMg phase, which resulted in the unicity of the intermetallics in the A1 matrix, and that the MgZn2 phase was easier for diffusion and dissolution during homogenization and solution than the Al2CuMg phase. Additionally, the results of the first-principles calculations gave support for explaining the experimental phenomena. A larger absolute value of formation enthalpy and a smaller value of binding energy of the MgZn2 phase, as compared with the Al2CuMg phase, give it priority to precipitate during casting and make it easier to re-dissolve during homogenization and solution treatment. What＇s more, higher elastic constants with severe anisotropy of Young＇s modulus make undissolved blocks of AI^CuMg phase act as crack initiation, which degrade the perfor- mance of the materials.

关键词： intermetallic phases homogenization solution first-principles Al alloys

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