STP955

    Study of Heavy and Light Ion Irradiation Induced Effects in Metallic Glass Samples

    Published: Jan 1987


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    Abstract

    The effect of Ar+ ion bombardment of a-Fe40Ni40B20 samples at varying fluences and energies, as investigated by conversion electron Mössbauer technique in the near surface region, has revealed an important correlation between the total Mössbauer absorption and the energy density deposited by the incident ions in the material. The shape of this correlation suggests that as the dose of the 150-keV incident Ar+ ions is increased, stresses develop in the material that may be responsible initially for the strengthening and beyond a certain limit for the weakening or breaking of the inter- and intra-molecular bondings in the irradiated region of the amorphous material. Increase in the energy of the incident ions also produces similar effects. This behavior depends greatly on the initial surface condition of the amorphous system. The proton irradiation of the same material has a different effect. It seems to cause the atomic spins to reorient in random directions in the sample. At the same time there is a formation of an additional iron or iron-nickel (Fe-Ni) rich phase in the irradiated samples at doses above 5 × 1015 protons/cm2. In these latter samples the relative susceptibility and hence the bulk magnetization are found to decrease continuously as a function of irradiation dose.

    Keywords:

    metallic glass, ion bombardment, conversion electron Mössbauer spectroscopy, energy density, inter-molecular bonds, intra-molecular bonds, surface condition, atomic spin orientation, relative susceptibility, bulk magnetization, Mössbauer absorption


    Author Information:

    Bhagawat, A
    Research scholar, fellow, reader, and professor, Tata Institute of Fundamental Research, N.S. Group,

    Kurup, MB
    Research scholar, fellow, reader, and professor, Tata Institute of Fundamental Research, N.S. Group,

    Prasad, KG
    Research scholar, fellow, reader, and professor, Tata Institute of Fundamental Research, N.S. Group,

    Sharma, RP
    Research scholar, fellow, reader, and professor, Tata Institute of Fundamental Research, N.S. Group,


    Paper ID: STP33868S

    Committee/Subcommittee: E10.07

    DOI: 10.1520/STP33868S


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