Abstract
In the present paper, glass forming ability (GFA) of Zr57Cu20Al10Ni8Ti5−xAgx (x=0, 1, 2, 3, 4, 5) bulk metallic glasses (BMGs) are studied using conventional copper mold suction casting method. The critical diameter of amorphous rod is improved from 8mm of Zr57Cu20Al10Ni8Ti5 to 20mm of Zr57Cu20Al10Ni8Ag5 by fully substituting Ti with Ag. The great improvement of GFA is attributed to the enlarged negative mixing enthalpy, large atomic packing fraction, and low critical cooling rate, which are −32.026kJ/mol, 0.761, and 2.5K/s, respectively. The mechanical property is also improved by substituting Ti with Ag. The yield strength, ultimate strength and plastic strain are enhanced from (1469MPa, 1490MPa and 0.1%) for Zr57Cu20Al10Ni8Ti5 BMG to (1612MPa, 1746MPa and 2.1%) for Zr57Cu20Al10Ni8Ag5 BMG, respectively.
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