Dynamic anelastic response of amorphous alloys suggesting collective motions of many atoms
Dynamic anelastic response of amorphous alloys suggesting collective motions of many atoms
复制标题
非晶合金的动态滞弹性响应表明许多原子的集体运动
DOI：
10.1016/s1359-6454(97)00283-8
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发表时间：
1998
期刊：
影响因子：
9.4
通讯作者：
M. Horiuchi
中科院分区：
文献类型：
--
作者：
H. Mizubayashi;T. Okamoto;K. Koyama;M. Horiuchi
对于非晶态(a-)Pd80Si20，我们在低于380K的温度范围内测量了杨氏模数E(εt，f)作为应变幅度εt和测量频率f的函数，在静态拉伸和弯曲试验中发现E(εt，0)保持不变，对于εt<；0.3%。在εt=10−6时，随着f的增加，E(10−6，f)与E(εt，0)的偏差随f的增加而减小，当f低于(103∼10~4)Hz时，E(εt，0)偏离E(∼t，0)，在102 Hz左右出现最小值(=fChereAfter)，当f高于(103∼10~4)Hz时，E(εt，0)大于E(∼t，0)。在fc附近的振动簧片试验中，随着εt的增加，E(εt，fc)在0.3%以下的应变范围内表现出增加和饱和，其中E(0.3%，fc)比E(εt，0)高得多，几乎等于晶态的杨氏模数。经过晶化处理后，其特征弹性响应减小。我们推测，基本结构中的局域剪切变形和多个原子可能的集体运动都是造成这种特征弹性响应的原因。
For amorphous (a-) Pd80Si20, we measured the Young's modulus E(εt,f) as a function of the strain amplitude εtand the measurement frequency f in the temperature range below 380 K. Linear elasticity is found in the static tensile and bending tests where E(εt,0) remains constant for εt< 0.3%. For the vibrating reed tests at εt= 10−6, with increasing f, E(10−6,f) shows a deviatory decrease from E(εt,0) for f below (103∼104) Hz showing a minimum at around 102Hz ( = fChereafter) and increases beyond E(εt,0) for f above (103∼104) Hz. For the vibrating reed tests at around fCwith increasing εt, E(εt,fC) shows an increase and saturation in the strain range below 0.3%, where E(0.3%,fC) is considerably higher than E(εt,0), and nearly equal to the Young's modulus estimated for the crystalline state. The characteristic elastic responses diminish after annealing for the crystallization. We surmise that both the localized shear deformation in the elementary structures and the probable collective motions of many atoms are responsible for the characteristic elastic response.