Achieving superior glass forming ability of Zr-Cu-Al-Ni-Ti/Ag bulk metallic glasses by element substitution

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• 作者：Xiao Cui ; Fang-qiu Zu ; Wei-xin Jiang ; Li-fang Wang ; Zhi-zhi Wang
• 关键词：Bulk metallic glass ; Glass forming ability ; Atomic packing fraction ; Mechanical property
• 刊名：Journal of Non-Crystalline Solids
• 出版年：2013
• 出版时间：1 September, 2013
• 年：2013
• 卷：375
• 期：Complete
• 页码：83-87
• 全文大小：847 K

文摘

In the present paper, glass forming ability (GFA) of Zr₅₇Cu₂₀Al₁₀Ni₈Ti_5 ? xAg_x (x = rong class=""boldFont"">0rong>, 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 8 mm of Zr₅₇Cu₂₀Al₁₀Ni₈Ti₅ to 20 mm 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 ? 32.026 kJ/mol, 0.761, and 2.5 K/s, respectively. The mechanical property is also improved by substituting Ti with Ag. The yield strength, ultimate strength and plastic strain are enhanced from (1469 MPa, 1490 MPa and 0.1 % ) for Zr₅₇Cu₂₀Al₁₀Ni₈Ti₅ BMG to (1612 MPa, 1746 MPa and 2.1 % ) for Zr₅₇Cu₂₀Al₁₀Ni₈Ag₅ BMG, respectively.