Formation of Mg-Cu-Zn-Y bulk metallic glasses with compressive strength over gigapascal

被引：0
|
作者：
Li, Z.G. [1 ]
Hui, X. [1 ]
Zhang, C.M. [1 ]
Chen, G.L. [1 ]
机构：
[1] State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing, 100083, China
来源：
Journal of Alloys and Compounds | 2008年 / 454卷 / 1-2期
关键词：
The Mg55+xCu30-xZn5Y10 bulk metallic glasses (BMGs) with diameter of at least 3 mm were successfully fabricated in compositional range at x = 3-15 by conventional Cu-mold casting method. This kind of BMG alloys have supercooled liquid region (SLR) from 40 to 65 K; γ-value from 0.390 to 0.417; and the reduced glass transformation temperature from 0.543 to 0.576. By increasing the Zn content to 7%; the compressive strength of Mg-based BMG alloy reaches about 1.1 GPa. Vein pattern morphology has been observed in fractured surface of the Mg58Cu25Zn7Y10 alloy. The thermal; mechanical; and acoustic measurements indicate that Mg-Zn-Cu-Y BMGs are intrinsically brittle and are of good GFA. It is suggested that the correlation of elastic constants and mechanical properties of alloys could guide the Mg-based BMGs design. © 2007 Elsevier B.V. All rights reserved;
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页码：168 / 173
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