| The transformation behavior of Zr-Al-Ni-Cu-Pd metallic glasses is investigated. It is well known that the Zr65Al7.5Ni10Cu17.5 metallic glass has a high glass-forming ability, which is enable us to produce the glassy sample with a bulky shape. In the initial transformation stage of the alloy, the metastable fcc-Zr2Ni phase is precipitated. Since the fcc-Zr2Ni phase contains several icosahedral clusters in the unit cell, it is strongly correlated with the icosahedral local structure in the glassy state. By substitution of Pd with Cu, the primary phase changes into nanoscale icosahedral quasicrystalline phase. It is found that the nucleation frequency increases drastically with Pd addition, which results in the formation of nanostructured materials. These nanoscale structure control based on the glassy alloys is expected to exhibit unique mechanical properties such as a high strength and good ductility. |
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