STP955

    Helium Ion Implantation Induced Damage in Metallic Glasses

    Published: Jan 1987


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    Abstract

    The precipitation of implanted helium into bubbles, blistering, flaking, and exfoliation in metallic glasses, such as Fe80B20, Fe40Ni40B20, Fe40Ni40P14B6, Fe40Ni38Mo4B18, Ni64Zr36, Ni33Zr67, and Ni60Nb40, are investigated. A systematic study as a function of relevant irradiation and material variables is presented. The effect of projectile energy (50 to 150 keV), total dose (1 × 1016 to 1 × 1019 ions/cm2), dose rate (10 to 100 μÅ/cm2), cold-work (30% thickness reduction), and thermal crystallization has been studied and is presented. The changes in surface topography caused by post-irradiation annealing for 2 h at 473, 673, and 873 K are also examined. The results on metallic glasses are compared with similar results reported for crystalline materials. The similarities and differences in the damage behavior of metallic glasses and crystalline materials are discussed. The main difference observed for metallic glasses is a relatively higher (50 to 100%) resistance against blistering or flaking or both as compared to their crystalline counterparts. Helium trapping, bubble nucleation, and bubble growth in metallic glasses are also briefly described.

    Keywords:

    ion implantation, surface damage, blistering, flaking, exfoliation, helium bubbles, metallic glasses


    Author Information:

    Tyagi, AK
    Scientific officers, Materials Science Laboratory, Indira Candhi Centre for Atomic Research, Tamil Nadu,

    Nandedkar, RV
    Scientific officers, Materials Science Laboratory, Indira Candhi Centre for Atomic Research, Tamil Nadu,


    Paper ID: STP33867S

    Committee/Subcommittee: E10.07

    DOI: 10.1520/STP33867S


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