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Hydrogen permeation characteristics of rolled V<sub>85</sub>Al<sub>10</sub>Co<sub>5</sub> alloys
Fleury, Eric,Suh, Jin-Yoo,Kim, Dong-ik,Jeong, Chan Hoon,Park, Jung Hoon Elsevier 2012 Current Applied Physics Vol.12 No.4
<P><B>Abstract</B></P><P>Thin sheets of V<SUB>85</SUB>Al<SUB>10</SUB>Co<SUB>5</SUB> alloy were produced by a thermo-mechanical treatment consisting in successive hot rolling, cold rolling steps and annealing treatment at high temperature followed by either air cooling or water quenching. Though the values of hydrogen permeability measured for these sheets were significantly reduced as a consequence of the rolling process, the annealing treatment restored almost the hydrogen permeation properties to those of the alloy in the cast condition. EBSD analyses suggested that the post-annealing treatment performed at 1100 °C for 3 min after cold rolling induced a recrystallization of the grains resulting in a preferred orientation along the {002} planes. For the sample annealed and water quenched, the value of the hydrogen flux reached about 45 ml/cm<SUP>2</SUP>.min, which is more than twice the value of the flux obtained for thin foils of Pd alloys tested under identical conditions.</P> <P><B>Highlights</B></P><P>► Thin membranes of V–Al–Co alloy have been prepared by thermo-mechanical treatment. ► The hot and cold rolled alloys were annealed at high temperature for a short time. ► The hydrogen permeability shows a dependence on the cooling rate after annealing. ► Fast cooling rates induced by water quenching enhanced the hydrogen permeability. ► The study demonstrates the effect of low angle grain boundaries on these properties.</P>
Enhancement of soft magnetic properties by nanocrystallization in modified cast iron
Bali, Rantej,Fleury, Eric,Lim, SangHo Elsevier 2005 SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS Vol.6 No.3-4
<P><B>Abstract</B></P><P>A cast iron composition has been modified by additions of Al, B, Y and Cu to the Fe–C master alloy in order to achieve glass forming ability as well as good magnetic properties. Amorphous ribbons were synthesized by rapidly quenching at 10<SUP>6</SUP>K/s and the devitrification process was controlled by varying the Y and Cu contents so as to achieve a composite structure of bcc Fe nanocrystals in an amorphous matrix. An improvement of saturation magnetization was observed by annealing the as-quenched ribbons. However, coercivity does not necessarily improve upon annealing, and therefore, the annealing should be judiciously scheduled. Effect of minor impurities in cast iron on the coercivity and saturation of these alloys was found to be insignificant.</P>
Thermal Stability and Mechanical Properties of Hydrogenated Zr-Ni-Nb-Co Amorphous Alloy
Jayalakshmi, S.,Fleury, Eric,Kim, Yu Chan,Kim, Ki Bae Trans Tech Publications, Ltd. 2005 Materials science forum Vol.486 No.-
<P>Zr50Ni27Nb18Co5 amorphous ribbons were hydrogenated using an electrochemical method. Under a current density of 30 mA/cm2, the thermal stability of the amorphous phase was found to increase with the charging time. Hardness and fracture strength were found to be independent of charging time, indicating that the Zr-Ni-Nb-Co amorphous alloys preserved its mechanical integrity.</P>
Al-Ni-Co-Si 준결정 코팅층의 미끄럼 마찰과 마모특성에 미치는 온도 및 용사방법의 영향
金在洙,김우찬,Eric Fleury,金道鄕,金元泰,安孝錫,李尙穆 대한금속재료학회 2002 대한금속·재료학회지 Vol.40 No.10
Powders of Al-Ni-Co-Si alloys were produced by gas-atomization under protective N_2 atmosphere. The gas-atomized powders were sieved to select them having a size range of -200∼+400 mesh. Quasicrystalline coatings were deposited onto the 304 stainless steel substrates using two thermal spraying techniques: high velocity oxygen fuel (HVOF) and air plasma spraying(APS). The friction and wear behaviors of the coatings were evaluated under the various conditions. The wear amount of both the coating and the chromium coated cast iron disc during the testing was determined by measuring the weight loss after the test. Analysis of the wear debris and of the wear track on both the coating and Cr coated cast iron disk was observed by using scanning electron microscopy. Friction coefficient of the plasma coating was about 0.36 and of the HVOF coating was about 0.43. The APS-deposited coatings, which had a higher level of porosity, exhibited a higher friction coefficient and lower wear resistance than the HVOF processed coatings. However, as the temperature during wear testing increased, the wear resistance of APS was improved and tended to be similar to that of HVOF coatings. Higher wear resistance of HVOF was attributed to the densification of the coating sub-surface with lower porosity and agglomeration of shall wear debris into large cylindrical particles and foramtion of intermediate layer.