Abstract
Bulk glassy alloys exhibiting high strength and good corrosion resistance were formed in (Cu0:6Zr0:3Ti0:1)100� xyNiyNbx systems. The bulk glassy alloy rods with a diameter of 3 mm are formed in a wide composition range of 0 to 6 at%Ni and 0 to 6 at%Nb by copper mold casting. As the Nb content increases, the glass transition temperature (Tg) increases while the crystallization temperature (Tx) decreases, resulting in a decrease inTx ð¼ TxTgÞ from 60 K at 0 at%Nb to 36 K at 5 at%Nb. The high fracture strength (� c,f) exceeding 2000 MPa is obtained for the Cu-Zr-Ti-Ni-Nb alloys containing more than 3 at%Nb and their high strength alloys also exhibit distinct plastic elongation of 0.2 to 0.8%. The corrosion resistance of the Cu-Zr-Ti bulk glassy alloy is also significantly improved by the simultaneous addition of Ni and Nb and no loss in sample weight in 1 N HCl and 3%NaCl solutions is detected for the Cu-Zr-Ti-Ni-Nb alloys containing 5 at%Ni and 6 at%Nb or 2 at%Nb, respectively. The usefulness of the simultaneous addition of Ni and Nb on thec,f and corrosion loss in conjunction with high glass-forming ability seems to affect significant influence on the future development of bulk glassy alloys with special functional characteristics. prepared by arc melting the mixtures of pure metals in an argon atmosphere. The alloy compositions represent nominal atomic percentages. Cylindrical alloy rods with different diameters of 2 to 5 mm and a length of 70 mm were produced by a copper mold casting method. Alloy ribbons with a cross section of 0:03 � 1:2 mm 2 were produced by a melt spinning method. The glassy structure was examined by X-ray diffraction and transmission electron microscopy (TEM). Thermal stability associated with glass transition temperature and crystallization temperature was examined by differential scanning calorimetry (DSC) at a heating rate of 0.67 K/s. The melting and liquidus temperatures (Tm and Tl) were measured by differential thermal analysis (DTA) at a heating rate of 0.067 K/s. Mechanical properties were measured with an Instron testing machine. The gauge dimension was 2 mm in diameter and 4 mm in length and the strain rate was 5:0 � 10 � 4 s � 1 . Fracture surface was examined by scanning
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