Calorimetric glass transition in bulk metallic glass forming Zr-Ti-Cu-Ni-Be alloys as a free-volume-related kinetic phenomenon
Calorimetric glass transition in bulk metallic glass forming Zr-Ti-Cu-Ni-Be alloys as a free-volume-related kinetic phenomenon
复制标题
DOI：
10.1103/physrevb.67.212201
复制
发表时间：
2003-06
影响因子：
3.7
通讯作者：
P. Wen;M. Tang;M. Pan;D. Zhao;Z. Zhang;Weihua Wang
中科院分区：
文献类型：
--
作者：
P. Wen;M. Tang;M. Pan;D. Zhao;Z. Zhang;Weihua Wang
用自由体积理论模拟了在差示扫描量热法实验过程中，Zr46.25Ti8.25Cu7.5Ni10Be27.5(Vit4)大块金属玻璃的量热玻璃化转变过程。根据自由体积湮灭和产生的动力学，在此基础上进行的计算在结构松弛和玻璃化转变方面与已有的VIT4合金的实验数据符合得很好。玻璃化转变过程的变化依赖于样品中剩余的还原自由体积。在量热玻璃化转变温度以下不同时间的退火过程中出现的结构弛豫与过剩自由体积的湮没有关。结果表明，量热玻璃化转变是一个主要的动力学过程。
The change of the calorimetric glass transition in Zr46.25Ti8.25Cu7.5Ni10Be27.5 (vit4) bulk metallic glass during differential scanning calorimetry experiments was simulated with the free-volume theory. With the kinetics of the free-volume annihilation and production, calculations carried out on this basis are in good agreement with available experiment data in vit4 alloy both on structural relaxation and the glass transition. The change of the glass transition process is dependent upon the reduced free volume remained in the specimens. The structural relaxation occurring during annealing below the calorimetric glass transition temperature for different times is relative to the annihilation of the excess free volume. The results support that the calorimetric glass transition is a mainly kinetic process.