Abstract
We have discovered a series of bulk metallic glass-forming alloys of composition (ZrxCu100−x)80(Fe40Al60)20 with x=68–77 and have investigated them by x-ray diffraction, small-angle neutron scattering, and differential scanning calorimetry. All of these alloys exhibit a calorimetric glass transition temperature of 670K<Tg<687K and a large undercooled liquid region of widths 73–86 K. The best glass-forming ability is obtained for x≈72.5, i.e., for the alloy Zr58Cu22Fe8Al12. In rod shape this alloy has a critical casting thickness of 13 mm, as verified by detailed casting experiments, while alloys with x=68 and 77 can still be cast to a thickness of 5 mm. Furthermore, the region where glassy samples with a thickness of 0.5 mm can be prepared extends from x=62–81. The best glass-former, Zr58Cu22Fe8Al12, has a tensile yield strength of 1.71 GPa and shows an elastic limit of 2.25%. This new class of Ni-free Zr-based alloys is potentially very interesting for biomedical applications.
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