Abstract
In this work, Ø 3 mm × 70 mm (Zr_63.36Cu_14.52Ni_10.12Al₁₂)_1-xY>)_x (x = 0, 0.2, 0.5, 0.6, 1, 1.2, 1.5, 2, and 3 at.%) rod-shaped bulk metallic glasses (BMGs) were fabricated using the copper mold suction casting method and the effects of the addition of Y on the properties of Zr-based BMGs were studied. The results indicate that the properties of Zr-based BMGs can be enormously improved by the addition of an appropriate amount of the rare earth Y element. The values of the supercooled liquid region width (ΔT_x), glass-forming ability (GFA) parameter (γ), thermoplastic forming (TPF) ability parameter (S), and plastic strain (ε_p) for the alloy with x = 0.6 reach 115 K, 0.390, 0.228, and 16.5 %, respectively, and are much higher than those of the alloy with x = 0, indicating that the alloy with x = 0.6 exhibits excellent thermal stability, glass-forming ability, thermoplastic forming ability, and compressive plasticity. It was also found that the alloy with x = 1.5 has the minimum corrosion current (i_corr = 1.12 × 10^–9 A cm^–2), showing excellent corrosion resistance. Overall, the alloy with the Y content of x = 0.6 demonstrates excellent thermal stability, GFA, TPF ability, mechanical properties and corrosion resistance, thus displaying improved comprehensive properties.

Key words
bulk metallic glass, rare earth Y, glass-forming ability, plastic strain, corrosion resistance

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