Deformation behavior of Zr-Al-Cu-Ni-Sn metallic glasses

被引:11
作者
Bae, D. H. [1 ]
Lee, S. W.
Kwon, J. W.
Yi, S.
Park, J. S.
机构
[1] Yonsei Univ, Dept Mat Sci & Engn, Seoul 120749, South Korea
[2] Kyungpook Natl Univ, Dept Mat Sci & Met, Taegu 702701, South Korea
[3] Yonsei Univ, Ctr NonCrystalline Mat, Dept Mat Sci & Engn, Seoul 120749, South Korea
关键词
D O I
10.1557/JMR.2006.0151
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
A highly deformable Zr-Al-Cu-Ni-Sn alloy system without any catastrophic failure has been developed and the underling mechanism for exceptional plasticity has been investigated in terms of structural characteristics and atomic movement kinetics. The as-cast Zr61.7Al8Ni13Cu17Sn0.3 bulk metallic glass has many local nanoscale ordering features. They can play a critical role in nucleating abundant shear bands that sufficiently accommodate global plasticity. During deformation at room temperature, the ordered regions do not grow, providing a structural stability, possibly from the sluggish atomic movement kinetics. Thermal activation energy for crystallization of the Zr61.7Al8Ni13Cu17Sn0.3 alloy is estimated as 3.96 eV, which is about 2.8 times higher than that of the Z(41.2)Ti(13.8)Cu(12.5)Ni(10)Be(22.5) alloy [Vitreloy 1 (Vit1)] and the dynamic mass flow rate is around 10 times slower than that of Vit1. A thermomechanical estimation of compressive strain rates under constant stress shows a sluggish atomic movement upon the addition of Sn.
引用
收藏
页码:1305 / 1311
页数:7
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