17th International Conference on Ion Beam Modification of Materials

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Ion implantation effects on structural changes and mechanical properties of Zr-Cu-Al-Ni metallic glasses

Shinji Nagata*, Masato Sasase, Shunya Yamamoto, Bun Tsuchiya, and Tatsuo Shikama

poster presentation: Tuesday 2010-08-24 05:00 PM - 07:00 PM in section Modification of semiconductors, metals and ceramics
Last modified: 2010-06-02

Abstract


The Zr-Al-Ni-Cu alloy is a typical metallic glass, which has excellent physical and chemical properties based on a wide super cooled liquid region.   Ion implantation is an alternative method to created non-equilibrium phase by nuclear and electronic energy deposition,and to embed simultaneously an additional element.   In the present paper,   nano-crystalline formation and its effects on the mechanical properties were examined in Zr65Cu17.5Ni10Al7.5 alloy irradiated by ion beams.

The samples used in the present study were metallic glass ribbons prepared by the melt spinning method and were amorphous films prepared by the RF magnetron sputtering method.  Ions of Mg, P, and Bi with the 200 – 500 keV were implanted into the sample at room temperature.  The structural and compositional changes of the ion implanted surface were investigated by transmission electron microscope (TEM), X-ray diffractometry (XRD) and Rutherford Backscattering Spectrometry (RBS).  Mechanical properties were examined by micro-vickers and nano-indentation techniques.  Nano-crystalline precipitates of fcc-Zr2Cu were effectively formed with a size of 5 - 20 nm in the amorphous matrix by ion irradiation to fluences above 1 x 1016 cm-2, although the long-range ordering of the structure was not observed in the X-ray diffraction patterns.  The size and the concentration of the ion-induced precipitates were increased with the nuclear energy deposition of the ion, and the structure of the precipitates was independent on the ion species.   The hardness and elastic modulus estimated by the nano-indatation were proportional the volume fraction of the ion-induced precipitates.


Author(s) affiliation:
Shinji Nagata*, Tohokun University, Japan
Masato Sasase, The Wakasa-wan Energy Research Center, Japan
Shunya Yamamoto, Japan Atomic Energy Agency, Japan
Bun Tsuchiya, Tohoku University, Japan
Tatsuo Shikama, Tohoku University, Japan

*presenting author
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