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A glassy phase containing high volume fractions (V f ) of bcc Ta-based phase was formed in as-cast (Cu 0 . 6 Hf 0 . 2 5 Ti 0 . 1 5 ) 9 4 Ta 6 alloy rods with diameters up to 2 mm. Its V f increased from 9.5 to 11% with increasing rod diameter from 1 to 2 mm. The in-situ bcc phase has a dendritic morphology with a size of about 10μm and its size tends to increase with increasing V f . The bcc phase has analytical compositions of 1.4 at% Cu, 7.6 at% Ti and 91.0 at% Ta. The lattice parameter of the bcc phase is 3.306 nm which approximates to that of Ta metal. The thermal stability of the remaining glassy matrix remains unchanged in coexistence with the bcc phase. The mixed structure is presumed to be formed by the primary precipitation of ductile dendritic bcc phase, followed by the solidification of the remaining liquid to glassy phase. The Young's modulus (E), yield strength (σ y ), true compressive fracture strength (σ t , f ) and true plastic strain (ep) were 104 GPa, 2125MPa, 2100 MPa and 0.34, respectively, for the Φ2 mm rod with 11% V f . The σ y and σ t , f are higher than those (2010 MPa and 2005 MPa) for the Cu 6 0 Hf 2 5 Ti 1 5 glassy alloy rod with a diameter of 2 mm. Especially, the e p for the (Cu 0 . 6 Hf 0 . 2 5 Ti 0 . 1 5 ) 9 4 Ta 6 mixed structure alloy is dramatically enhanced in comparison with that (e p = 0.016) for Cu 6 0 Hf 2 5 Ti 1 5 single phase alloy. The enhancement of σ y , σ t , f and e p in the mixed structure of glassy and bcc phase for the new Cu-based system is promising for future uses as a new type of high-strength bulk glassy alloy.

Excellent Mechanical Properties of Cu-Hf-Ti-Ta Bulk Glassy Alloys Containing <i>In-Situ</i> Dendrite Ta-based BCC Phase