Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • 2000-2004
  • 1985-1989  (7)
  • 1988  (7)
Source
Material
Years
  • 2000-2004
  • 1985-1989  (7)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Phase formation in mechanically alloyed Nb-Al powders (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 1399-1401 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Nb-Al alloys have been prepared by mechanical alloying of elemental crystalline powders and investigated with x-ray diffraction and transmission electron microscopy. Crystalline equilibrium phases form for Al-rich alloys. Amorphous phase formation is observed for the Nb50Al50 composition. Mechanically alloyed powders with more than 70 at. % Nb exhibit the metastable bcc (A2) solid solution which transforms after thermal annealing into the A15 phase. Formation of the different phases can be understood by considering the free-energy curves of the amorphous and bcc phases as calculated from the phase diagram and additional thermodynamic data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.99989
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Epitaxial growth of YBa2Cu3O7−x thin films by a laser evaporation process (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 1557-1559 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Thin films of YBa2 Cu3 O7−x have been grown epitaxially in c-axis orientation on 〈100〉 SrTiO3 by pulsed excimer laser evaporation from a stoichiometric 1-2-3 target. The substrate temperature was adjusted between 720 and 780 °C, and the oxygen partial pressure during the deposition was chosen in the range 0.1–0.3 mbar. Cooled to ambient temperature in situ for 1 h in flowing oxygen gas, the films showed complete diamagnetism and zero resistance at 90 K with a transition width of 2 K. Critical current densities of 2.2×106 A/cm2 in zero magnetic field and 1.5×105 A/cm2 at 2 T were measured at 77 K. The resistivity at 100 K was about 60 μΩ cm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.100437
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Isotropic and anisotropic Nd-Fe-B-type magnets by mechanical alloying and hot pressing (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 342-343 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Mechanically alloyed Nd-Fe-B powder has been formed to compacted isotropic and anisotropic magnets by hot pressing and die upsetting. The coercivity and its composition dependence of hot-pressed samples are similar to those obtained for resin-bonded samples of the reacted powder. A ratio of up to 2.6 was obtained for the remanences measured parallel and perpendicular to the press direction during die upsetting in preliminary experiments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.100602
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Mechanically alloyed isotropic and anisotropic Nd-Fe-B magnetic material (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 5302-5304 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Starting from elemental powders, hard-magnetic Nd-Fe-B can be produced by mechanical alloying and a solid-state reaction. Due to the short reaction time at relatively low temperatures (typically 30 min at 700 °C), the magnetically isotropic particles are microcrystalline and show a high coercivity. These powders can be compacted to dense isotropic magnets by hot uniaxial pressing. An additional deformation at elevated temperatures is used to form magnetically anisotropic samples. With regard to microstructure, magnetic properties, compaction, and formation of anisotropy, the magnetically alloyed material is comparable with the rapidly quenched Nd-Fe-B. The formation characteristics and the magnetic properties of resin-bonded powder, hot compacted isotropic material, and hot deformed anisotropic samples are described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342399
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Coercivity in ThMn12 -type magnets (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 5711-5713 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Fe-rich and RE-containing phases with the ThMn12 structure show interesting intrinsic magnetic properties. The single-phase composition Fe80Mo12Sm8 has a saturation magnetization of 10 kG, a Curie temperature of about 200 °C, and an anisotropy field of about 90 kOe, with the saturation magnetization and the Curie temperature being further improved by a Co substitution. In this contribution we report on the first experiments to create coercivity in these samples. As preparation techniques we applied mechanical alloying and rapid quenching which both result in microcrystalline material. The highest coercivity (3.8 kOe) so far was obtained for a multiphase sample prepared by mechanical alloying and a successive heat treatment at 800 °C. The dependence of coercivity on composition for these samples is discussed. Results for rapidly quenched material are also presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342234
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Progress of the amorphization reaction during mechanical alloying in Fe-Zr (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 1408-1413 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The amorphization process in mechanically alloyed Fe-Zr powders has been investigated by optical and scanning electron microscopy, x-ray diffraction, differential scanning calorimetry, and saturation magnetization measurements. The transformation from the initially layered composite to the amorphous alloy occurs between 2 and 16 h milling time. Longer milling leads to a homogenization within the particles. Prior to amorphization the internal stress within the powder particles strongly increases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.339972
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Glass-forming range in mechanically alloyed Ni-Zr and the influence of the milling intensity (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 3224-3228 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Amorphous Ni-Zr powders have been prepared by mechanical alloying from crystalline elemental powders. The glass-forming range has been determined by x-ray diffraction, differential scanning calorimetry and saturation magnetization measurements. From 27 to 83 at. % Ni the powders become amorphous. This shows that deep eutectics do not play any role, contrary to amorphization by melt spinning. Crystallization temperatures, crystallization enthalpies, and wave numbers Qp, obtained from x-ray diffraction investigations, are compared with the data received for rapidly quenched samples. In addition, the effect of the milling intensity on the glass formation has been studied for the first time. If the intensity is too high, crystalline intermetallic phases are formed. On the other hand, the powder needs an extended milling time to become completely amorphous if the milling intensity is too low. Conclusions on the actual temperature of the individual particle during mechanical alloying and on the glass-forming process are drawn from these results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.341540
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...