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  • 1
    Electronic Resource
    Electronic Resource
    The irreversibility behavior of NdBaCuO fabricated by top-seeded melt processing (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 75 (1999), S. 2981-2983 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Large, single grain NdBa2Cu3O7−δ (Nd123)–Nd4Ba2Cu2O10 (Nd422) composites have been fabricated up to 2 cm in diameter in a controlled 1% O2 in N2 atmosphere using a top-seeded melt growth technique. The irreversibility field as a function of temperature has been obtained from magnetic hysteresis loops for magnetic fields applied parallel and perpendicular to the c axis of small specimens ((approximate)2×2×3 mm3) cut from individual grains. These specimens are observed to exhibit a pronounced peak effect for current flowing in the a–b plane and a five-fold anisotropy in the irreversibility line over a wide temperature range for fields applied along the major crystallographic axes. An exceptionally high irreversibility field (〉12 T at 89 K) is observed in this material for field applied perpendicular to the c axis, which extrapolates to well over 40 T at 77 K. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.125208
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  • 2
    Electronic Resource
    Electronic Resource
    Fabrication of Metal Matrix Composites under Intensive Shearing (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 141-143 (July 2008), p. 373-378 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: Current processing methods for metal matrix composites (MMC) often producesagglomerated reinforced particles in the ductile matrix and also form unwanted brittle secondaryphases due to chemical reaction between matrix and the reinforcement. As a result they exhibitextremely low ductility. In addition to the low ductility, the current processing methods are noteconomical for producing engineering components. In this paper we demonstrate that theseproblems can be solved to a certain extent by a novel rheo-process. The key step in this process isapplication of sufficient shear stress on particulate clusters embedded in liquid metal to overcomethe average cohesive force of the clusters. Very high shear stress can be achieved by using thespecially designed twin-screw machine, developed at Brunel University, in which the liquidundergoes high shear stress and high intensity of turbulence. Experiments with Al alloys and SiCreinforcement reveal that, under high shear stress and turbulence conditions Al liquid penetratesinto the clusters and disperse the individual particle within the cluster, thus leading to a uniformmicrostructure
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.141-143.373.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Improved-Trapped Magnetic Fields in Top Seeded Melt Grown YBCO Superconductor Doped with Depleted and Enriched Uranium Oxide (2003)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 426-432 (Aug. 2003), p. 3499-3504 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/07/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.426-432.3499.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Melt texturing of NdBa Cu O Nd Ba Cu O superconductor in short time (1998)
    Springer
    The European physical journal 4 (1998), S. 55-59 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 74.80.Bj Granular, melt-textured, and amorphous superconductors; powders - 74.25.Ha Magnetic properties - 74.60.Jg Critical currents
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We have melt processed NdBa2Cu3O -Nd4Ba2Cu2O10 (NdBCO) superconducting composites with various rates of cooling through their peritectic formation temperature. The microstructural studies reveal that the sample processed even with C/h rate of cooling is built up with aligned microstructure which is necessary for superior transport current and magnetic properties. In the case of YBa2Cu3O , C/h rate of cooling is necessary to get highly textured microstructure. Magnetic flux profile measurements reveal that even though the intradomain region is well textured and had good transport and magnetic properties, the interdomain region is relatively weak in the fast cooled sample in comparison with slow cooled ones but is much better than that in polycrystalline samples. The results suggest that, the NdBCO superconductor can be melt processed in short time with much better microstructural features in comparison with YBCO system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510050350
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