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  • 1
    Digitale Medien
    Digitale Medien
    Amorphous phase transition mechanism by the mechanical alloying of the Fe–W system (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 1967-1971 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The Fe–W binary system exhibits a zero heat of mixing in the amorphous state. Thus, there is no chemical driving force for the crystal-to-amorphous transformation. However, the crystal-to-amorphous transition was observed in a mechanically alloyed mixture of pure Fe and W powders. A structural study by x-ray diffraction showed that supersaturated solid solutions of W in Fe [Fe(W) SSS] and Fe in W [W(Fe) SSS] were produced during the early stage of the mechanical alloying. Iron atoms were already totally involved in the solid-state amorphization reaction after 24 h of milling. The end products were W(Fe) SSS and amorphous Fe–W alloy. The amorphization by mechanical alloying of the Fe–W system is attributed to a solid-state amorphization reaction in which lattice distortion induced by supersaturation of W in Fe and a refinement of grain size may raise the free energy of Fe(W) SSS above that of the amorphous phase and make the Fe(W) SSS destabilize.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.351192
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  • 2
    Digitale Medien
    Digitale Medien
    Investigation of the amorphization reaction induced by amorphous phase through mechanical milling (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 7158-7160 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We report the study of the amorphization reaction induced by the amorphous phase through mechanical milling (MM). The amorphous iron-based powders (Fe78Si12B10) and elemental Al powders were mechanically milled in a planetary ball mill. X-ray diffraction, differential scanning calorimetry, and transmission electron microscopy were used to investigate the MM processes. Results showed that the Al atoms dissolved into the amorphous iron-based phase (Fe78Si12B10) and an Al-rich amorphous phase was produced.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.350366
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  • 3
    Digitale Medien
    Digitale Medien
    Magnetization study of the I-Al80Mn20 and T-Al78Mn22 quasicrystalline phases (abstract) : 35th annual conference on magnetism and magnetic materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 5149-5149 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The results of a magnetization study are reported for two phases of rapidly quenched Al-Mn that possess noncrystallographic rotational symmetry: icosahedral (I phase) I- Al80Mn20 and decagonal (T phase) T-Al78Mn22. The measurements were carried out over a temperature range from 1.7 to 300 K and for magnetic fields up to 50 kOe utilizing both VSM and SQUID magnetometry. The magnetic behavior of both phases is characterized by a small concentration of large moment "clusters'' and spin-glass-like ordering.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.348107
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  • 4
    Digitale Medien
    Digitale Medien
    Different reaction mechanisms during mechanical alloying Ti50C50 and Ti33B67 (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 1910-1912 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Two different reaction mechanisms for Ti50C50 and Ti33B67 have been observed respectively during milling in a planetary ball mill. It is shown that a gradual reaction occurred during milling Ti50C50, while a self-sustained reaction was obtained during milling Ti33B67 under the same milling condition. Compared with the results of milling Ti50C50 in a spex mill, the difference in mechanism is suggested to be caused by the effect of plastic deformation on the changes of fine grains and internal strain during milling, and the different formation heat of TiC and TiB2, which is the driving force for the reactions. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.363006
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  • 5
    Digitale Medien
    Digitale Medien
    Deformation-enhanced thermal stability of an amorphous Fe80B20 alloy (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 6055-6057 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: By means of differential scanning calorimeter (DSC) measurements, the thermal stability of an amorphous Fe80B20 alloy after various periods of low-energy ball milling has been studied. The results indicate that the thermal stability of the amorphous Fe80B20 ribbons can be enhanced upon mechanical deformation with a low milling intensity. The crystallization temperature Tp, the crystallization enthalpy ΔH, and the crystallization activation energy Ex increase with milling time. The above observations will be compared with our previous findings that extensive mechanical deformation with a high milling intensity can otherwise induce a structural relaxation in an amorphous Fe80B20 alloy. Based on conventional thermodynamic and kinetic arguments, a reasonable interpretation will be made to explain the enhanced thermal stability of the amorphous Fe80B20 alloy after mechanical deformation. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.363563
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  • 6
    Digitale Medien
    Digitale Medien
    Formation of amorphous Ge-S semiconductor alloys by mechanical alloying (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 63 (1993), S. 1637-1639 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Amorphous Ge1−xSx(x=0.61, 0.67, and 0.72) semiconductor alloys have been found formed by ball milling of powder mixtures of elemental Ge and S. The amorphization process and the ball-milled products have been investigated by x-ray diffraction, transmission electron microscopy, and Raman scattering. The results show that amorphous Ge-S alloys may form in a self-heating reaction, driven by the large heat of formation of amorphous and/or liquid Ge-S alloys. The structure of mechanically alloyed amorphous Ge-S alloys is similar to but not exactly identical with that of rapidly cooled amorphous Ge-S alloys. The amorphization transition mechanism reported is believed to be suitable for preparing other amorphous semiconductor alloys with similar thermodynamic conditions.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.110720
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  • 7
    Digitale Medien
    Digitale Medien
    On the mechanically driven rapid crystallization of amorphous Si3N4 ceramics (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 68 (1996), S. 915-916 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The effect of high-energy ball milling on the structure of nanometer sized amorphous ceramics, a-Si3N4 and a-Si–N–C, respectively, has been investigated. At high milling intensity, a-Si3N4 may rapidly crystallize into a mixture of α-Si3N4 and β-Si3N4 after the initial 4 s of milling whereas no structural changes were observed at low milling intensity. For a-Si–N–C, mechanical milling does not cause structural changes at both low and high intensity. It was found that extension of mechanical milling of these hard ceramics can introduce large volume fractions of contamination fragments from the milling media. We conclude that the observed structural changes occurring in a-Si3N4 may be due to mechanical effect, rather than local heating and/or impurity effect. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.116229
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  • 8
    Digitale Medien
    Digitale Medien
    Mechanically induced structural relaxation in an amorphous metallic Fe80B20 alloy (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 68 (1996), S. 319-321 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: A melt-spun metallic Fe80B20 glass was subjected to high-energy ball milling. Microstructural changes of the glassy sample during milling were characterized by means of x-ray diffraction, differential scanning calorimetry, Mossbauer spectroscopy, and Curie temperature measurements. It was found that the metallic glass may relax towards a low energetic configuration by mechanical milling, leading to a reduction of the heat release associated with crystallization of the amorphous phase and an increase of the average hyperfine field as well as of the Curie temperature. These results can be attributed to the occurrence of a strong short-range order in the amorphous state. Our experimental observations suggest that mechanical milling may induce structural relaxation in the amorphous Fe80B20 alloy. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.116072
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  • 9
    Digitale Medien
    Digitale Medien
    Induced magnetic anisotropy in Fe80B20 metallic glass by mechanical milling (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 68 (1996), S. 1159-1161 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: By means of transmission Mössbauer spectroscopy, the effect of mechanical milling on the magnetic anisotropy of Fe80B20 metallic glass has been studied. On the basis of variation of the areal ratio R21 of the second to the first Mössbauer line with milling time, it was found that a rotation of the average magnetic-moment directions from the in-plane to an out-of-plane orientation may take place by mechanical milling without onset of bulk crystallization, and that the distribution of the magnetic-moment directions becomes random after the bulk crystallization has occurred. The induced out-of-plane magnetic anisotropy by mechanical milling can be attributed to the occurrence of the chemical short-range order and surface crystallization in the Fe80B20 metallic glass. The latter effect may cause the formation of compressive stresses in the bulk and therefore a rotation of magnetic-moment directions in the Fe80B20 metallic glass. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.115709
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  • 10
    Digitale Medien
    Digitale Medien
    Effect of polarizable atmospheres on superconductivity of the Y-Ba-Cu-O compounds (1989)
    Springer
    Applied physics 48 (1989), S. 355-357 
    Details
    ISSN: 1432-0630
    Schlagwort(e): 74.70V
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract This letter reports that there may exist an intense interaction between the Y-Ba-Cu-O superconductors and polarizable molecules, which results in a change in structure and affects the superconductivity. This phenomenon can be explained in terms of the polarization and recombination of electron orbits of copper-oxygen plane.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00618898
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