Evaluation of approximate measurements of activation-free-energy spectra of shear transformation zones in metallic glasses
Evaluation of approximate measurements of activation-free-energy spectra of shear transformation zones in metallic glasses
复制标题
金属玻璃剪切转变区活化自由能谱近似测量的评估
DOI：
10.1016/j.jallcom.2014.10.156
复制
发表时间：
2015
影响因子：
6.2
通讯作者：
Atzmon, Michael
中科院分区：
文献类型：
--
作者：
Ju, JongDoo;Atzmon, Michael
多年来，金属玻璃中剪切转变的唯一实验活化自由能谱是通过在蠕变期间从高温淬火，然后温度步进获得的（Argon和Kuo，1980）。我们表明，与归因于一个单一的活化能，每个温度的近似导致在高活化能的光谱中的人工下降。我们最近获得的详细的潜在剪切转变区的光谱，表现出原子量子化的层次结构，是单调的，导致相同的光谱形状时，所获得的氩气和郭固有的温度步进方法的近似应用。
For many years, the only experimental activation free energy spectrum for shear transformations in metallic glasses had been obtained by quenching from high temperature during creep, followed by temperature stepping (Argon and Kuo, 1980). We show that the approximation associated with attributing a single activation energy to each temperature leads to an artificial drop in the spectrum at high activation energies. The detailed spectra of potential shear transformation zones we have recently obtained, which exhibit an atomically quantized hierarchy and are monotonic, lead to the same spectrum shape as obtained by Argon and Kuo when the approximation inherent to the temperature stepping method is applied.