Unusual relation between glass-forming ability and thermal stability of high-entropy bulk metallic glasses
Unusual relation between glass-forming ability and thermal stability of high-entropy bulk metallic glasses
复制标题
高熵块体金属玻璃的玻璃形成能力与热稳定性之间的异常关系
DOI：
10.1080/21663831.2018.1482839
复制
发表时间：
2018
影响因子：
8.3
通讯作者：
Lu Z. P.
中科院分区：
文献类型：
--
作者：
Yang M.;Liu X. J.;Wu Y.;Wang H.;Wang X. Z.;Lu Z. P.
通常认为，良好的玻璃形成体具有高的热稳定性，以防止在加热时结晶。本文报道了高熵大块金属玻璃（HE-BMG）的热稳定性与玻璃形成能力（GFA）之间的关系。与相同合金体系中的常规合金相比，HE-BMG在过冷期间具有较低的原子扩散能垒，这有利于结晶，从而降低GFA。我们的研究结果清楚地表明，BMG的GFA是由过冷液体的动力学，而它们的热稳定性是由在玻璃化转变制度的原子扩散控制。
It is generally accepted that good glass formers have a high thermal stability against crystallization upon heating. In this paper, we report an unusual relationship between thermal stability and glass-forming ability (GFA) for high-entropy bulk metallic glasses (HE-BMGs). As compared with their conventional counterparts in the same alloy system, the HE-BMGs have a lower energy barrier for atomic diffusion during undercooling, which facilitates crystallization and then reduces the GFA. Our results clearly demonstrate that the GFA of BMGs is governed by the kinetics of the undercooled liquid, whilst their thermal stability is controlled by atomic diffusion in the glass-transition regime.