Mechanical properties of ZrCuTi thin film metallic glass with high content of immiscible tantalum

The ZrCuTi thin film metallic glasses (TFMGs) with immiscible Ta were successfully fabricated via co-sputtering The glass forming composition for ZrCuTI-Ta TFMGs ranges from 0 to similar to 75 at.% of immiscible Ta, distinctly different from bulk metallic glasses (BMGs). When Ta content is over 75 at.%, the amorphous TFMG structure gradually transforms to nanocrystalline beta-Ta. The mechanical properties are strongly influenced by Ta content. The elastic modulus remains nearly constant over 0-50 at.% Ta, and increase rapidly over 50-100% Ta The key factor appears to be the population of the Ta-Ta strong bonds The highest elastic modulus and hardness up to -140 GPa and 10 GPa. respectively, of the Ta-rich TFMGs, much higher than the Zr-, Cuand Ti-based amorphous alloys, might be useful for applications. (C) 2010 Elsevier B V. All rights reserved.