Shear deformation capability of different metallic glasses
Shear deformation capability of different metallic glasses
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DOI：
10.1557/jmr.2008.0325
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发表时间：
2008-10
影响因子：
2.7
通讯作者：
F. Wu;Z. Zhang;J. Shen;S. Mao
中科院分区：
文献类型：
--
作者：
F. Wu;Z. Zhang;J. Shen;S. Mao
研究了Zr_（52. 5）Ni_（14. 6）Al_（10）Cu_（17. 9）Ti_（5）和Ti_（40）Zr_（25）Ni_（30）Cu_（12）Be_（20）非晶合金在单轴压缩和小冲杆加载下的力学性能。在小冲杆试验中，Zr基非晶合金具有比Ti基非晶合金更高的剪切带密度、更大的临界剪切偏移量和更高的能量吸收能力。提出了临界剪切偏移量的概念，用以解释不同金属玻璃剪切变形能力或塑性的差异。目前的实验表明，与单轴压缩载荷下的Zr基和Ti基金属玻璃的响应之间的小差异相比，由小冲杆试验产生的双轴拉伸是评估剪切变形能力差异的有效方法，并且可以用于区分各种金属玻璃的脆性或塑性。
The mechanical properties of Zr_52.5Ni_14.6Al_10Cu_17.9Ti_5 and Ti_40Zr_25Ni_3Cu_12Be_20 metallic glasses were investigated under uniaxial compressive loading and small punch loading, respectively. The Zr-based metallic glass displays higher density of shear bands, larger critical shear offsets and higher energy absorbing capability than the Ti-based metallic glass under the small punch tests. A concept of critical shear offset is proposed to explain the difference in shear deformation abilities or plasticity of different metallic glasses. The current experiments demonstrate that, in contrast with the small difference between the responses of the Zr- and Ti-based metallic glasses under uniaxial compressive loading, the biaxial tension produced by the small punch test is an effective way to evaluate the difference in shear deformation abilities and can be used to distinguish the brittleness or plasticity of various metallic glasses.