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Heterogeneous nucleation of icosahedral phase from FCC phase in cast Al 87 Mn 4 Si 2 Be 7 alloy
Fleury, E.,Chang, H.-J.,Kim, D.-H. Abingdon; Taylor & Francis Ltd 2006 PHILOSOPHICAL MAGAZINE Vol.86 No.3-5
<P>The formation of the icosahedral (i) quasicrystalline phase has been studied in the cast Al 87 Mn 4 Si 2 Be 7 alloy. Under low cooling rates, i-phase particles of about 5 to 15?µm formed in the a Al matrix. A thorough examination of the microstructure revealed the existence of cubic crystalline phases embedded in the i-particles. Microstructural and thermal analyses indicated that the i-particles nucleated heterogeneously from the cubic AlMn(Si)Be 4 phases by a peritectic reaction, however with a slight misorientation.</P>
Magnone, E.,Jeon, S. I.,Park, J. H.,Fleury, E. WILEY‐VCH Verlag 2012 CHEMICAL ENGINEERING AND TECHNOLOGY Vol.35 No.3
<P><B>Abstract</B></P><P>No investigation has yet been accomplished to screen the yttrium‐doped effects on vanadium‐based metal membranes. Synthesis, hydrogen permeation properties, and chemical stability of a novel palladium (Pd)‐coated V<SUB>99</SUB>Y<SUB>1</SUB> alloy membrane are presented. Hydrogen permeation experiments have been performed to investigate the hydrogen transport properties through the Pd‐coated V<SUB>99</SUB>Y<SUB>1</SUB> alloy membrane in the pressure range of 1.5–3.0 bar under pure hydrogen as well as H<SUB>2</SUB>‐CO<SUB>2</SUB> and H<SUB>2</SUB>‐CO gas mixtures at 400 °C. The maximum hydrogen permeation rate was ∼32 mL min<SUP>–1</SUP>cm<SUP>–2</SUP> for a 0.5 mm thick membrane under pure hydrogen. The results offer new directions in the synthesis of novel non‐Pd‐based metal membranes for hydrogen separation in precombustion capture applications. </P>
김도향,김원태,이상목,Fleury, E . 대한금속재료학회(대한금속학회) 2000 대한금속·재료학회지 Vol.38 No.4
Effects of air plasma spraying parameters on the formation of the icosahedral quasicrystalline coatings onto a mild steel plate were investigated using gas atomized Al_(62)Cu_(26)Fe_(12) powders. The as-atomized powders were appropriately sieved to have a size range of-200∼+400 mesh. Heat treatment at 750℃ for 3 hours was carried out to investigate the phase stability of the powders. Main process parameters such as arc current, spraying distance, powder feeding rate, preheating of the substrate were correlated to the coating layer characteristics. The volume fraction of the quasicrystalline phase in the coating layer was found to be a function of the chemistry and solidification history of the splats. Due to excessive evaporation of Al atoms during spraying, an initial powder composition more or less changed to form the β-AlFe(Cu) phase. As the arc current increased from 300 A to 500 A, both surface hardness and cross sectional hardness increased. The coating thickness was found to be a function of arc current, powder feeding rate, but less influenced by the spraying distance. The porosity level increased with an increase of arc current, spraying distance, and powder feeding rate. It is suggested that the atmospheric plasma coating process has a potential possibility of obtaining quasicrystalline coating layer, provided that the processing parameters are effectively optimized for obtaining high quantity of quasicrystalline phase.
중력주조법에 의한 Al-Cu-Fe 준결정 입자 강화 Al 기 복합재료의 제조와 그 기계적 성질
김도향,김원태,이상목,Fleury, E . 대한금속재료학회(대한금속학회) 2000 대한금속·재료학회지 Vol.38 No.7
An Al_(62)Cu_(26)Fe_(12) alloy was gas-atomized in a protective N₂ atmosphere to prepare powders containing the icosahedral quasicrystalline phase as reinforcing particles. Fabrication of composites was achieved by adding the Al_(62)Cu_(26)Fe_(12) powders into the pure Al molten metal as a matrix material, followed by a quick agitation during conventional casting. The composites showed a relatively good bonding between the particles and molten Al without the formation of any intermetallic compound, despite the partial dissolution of the small satellite particles. Mechanical properties evaluated through compression and non-destructive continuous indentation tests of the composites indicated a significant increase of the yield stress especially in the range up to 10% volume fraction of reinforcing particles within a reliable error range. Strengthening mechanisms were reviewed to estimate the role of the icosahedral and coexisting crystalline phases on the increase of the yield stress.