Mg-Cu-Y-Si合金玻璃形成能力及力学性能

Glass-forming ability and mechanical properties of Mg-Cu-Y-Si alloys

摘要: 利用铜模浇铸法制备了Mg₆₀Cu_30-xY₁₀Si_x(x=0,1.0,1.8,2.5,5.0)合金.结果表明,当x=1.0时,合金具有最大的玻璃形成能力,并且其显微硬度和断裂韧性比Mg₆₀Cu₃₀Y₁₀合金也有明显改善.与Mg₆₀Cu₃₀Y₁₀合金比较,Mg₆₀Cu₂₉Y₁₀Si₁合金过冷液相区宽度ΔT_x值减少,但约化玻璃转变温度T_rg值略有增加.

Abstract: Mg₆₀Cu_30-xY₁₀Si_x(x=0,1.0,1.8,2.5,5.0) bulk amorphous alloys were prepared by copper mould casting. The experimental results show that the alloy with x=1.0 has the largest glass-forming ability among Mg₆₀Cu_30-xY₁₀Si_x(x=0, 1.0, 1.8, 2.5, 5.0) alloys. The microhardness and fracture toughness of Mg₆₀Cu₂₉Y₁₀Si₁ alloy are also significantly improved compared with those of Mg₆₀Cu₃₀Y₁₀ alloy, but its supercooled liquid region (ΔT_x) decreases slightly. However, the reduced glass transition temperature (T_rg) of Mg₆₀Cu₂₉Y₁₀Si₁ alloy is larger than that of Mg₆₀Cu₂₉Y₁₀Si₁ alloy.