Glass Formation and Thermal Stability of Bulk Glassy Cu–Zr–Ti–Sn–Si Alloys

Abstract

The new Cu-based bulk glassy alloys in Cu-Zr-Ti-Sn-Si alloy system were formed by copper mold casting. The critical diameter for glass formation is 5 mm for Cu 50 Zr 42:5 Ti 7:5 , and increases to 6 mm for (Cu 0:5 Zr 0:425 Ti 0:075 ) 99 Sn 1 and 7 mm for (Cu 0:5 Zr 0:425 Ti 0:075 ) 98:8 Sn 0:6 Si 0:6 . The minor addition of Sn or Sn and Si in Cu 50 Zr 42:5 Ti 7:5 causes an increase in the supercooled liquid region from about 40 K to about 50 K, and in the reduced glass transition temperature from about 0.59 to about 0.60.

A Bulk Glassy Cu–Zr–Ti–Sn Alloy with Superior Plasticity

“…9) A fully amorphous microstructure without any crystalline feature can be confirmed for the as-cast 2-mm diameter rod, according to the HRTEM image and the corresponding selected-area electron diffraction (SAED) pattern with a diffused halo ring (as shown in Fig. 1).…”

Formation and Mechanical Properties of Cu–Zr–Al–Sn Bulk Metallic Glasses

“…8 alloy is much more sluggish than that of Cu 50 Zr 50 alloy. The atomic size ratio for both Zr/Al and Al/ Cu pair is as large as 1.12, and therefore the addition of Al with a medium atomic size can produce a more efficiently packed local structure in the undercooled liquid of ternary alloy than that of binary alloy.…”

“…[1][2][3][4][5][6][7][8] Most of them exhibit good mechanical properties, such as high fracture strength and large plasticity, [2][3][4][5]7,9,10) which can reach 2 GPa and 18%, respectively.…”