The viscoelastic properties of bulk Zr55Cu25Ni5Al10Nb5 metallic glass

The viscoelastic properties of bulk Zr55Cu25Ni5Al10Nb5 metallic glass
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大块Zr55Cu25Ni5Al10Nb5金属玻璃的粘弹性能

DOI:
10.1016/j.jallcom.2005.02.109
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发表时间:
2006-03
影响因子:
6.2
通讯作者:
--
中科院分区:
材料科学2区
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--
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本文研究了Zr{sub 55}Cu{sub 25}Ni{sub 5}Al{sub 1}Nb{sub 5}大块非晶合金在大温度和频率范围内的动态剪切模量。与其他常规玻璃成形系统一样,实验检测到具有典型动力学特征的明显{α}弛豫。因此,脆性参数,m,这是从粘弹性变形的激活能估计,表明Zr基大块非晶合金是一个相对强的液体。另一方面,在主要的力学弛豫过程中,Zr基大块非晶合金的动态剪切模量随频率的变化符合由物理模型导出的双抛物线方程,该方程可以表征无序凝聚态材料的原子迁移率和力学响应。
In this work, we have investigated the dynamic shear modulus of the bulk Zr{sub 55}Cu{sub 25}Ni{sub 5}Al{sub 1}Nb{sub 5} metallic glasses over large temperature and frequency ranges. Like in other conventional glass forming systems, a distinct {alpha} relaxation with typical kinetic features is experimentally detected. Therefore, the fragility parameter, m, which is estimated from the activation energy for viscoelastic deformation, indicates that the Zr base bulk amorphous alloy is a relatively strong liquid. On the other hand, during the main mechanical relaxation, the frequency dependence of dynamic shear modulus of the Zr base bulk amorphous alloy follows the biparabolic equation derived from a physical model, which can characterize the atomic mobility and mechanical response of disordered condensed materials.
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