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Contribution of cryogenic thermal cycling to the atomic dynamics in a La-based bulk metallic glass with different initial states
Journal of Applied Physics ( IF 3.2 ) Pub Date : 2020-05-29 , DOI: 10.1063/5.0005566
H. B. Xiao 1 , X. D. Wang 1 , P. Zhang 2 , X. Z. Cao 2 , Y. Chen 3 , T. Le 3 , Q. P. Cao 1 , D. X. Zhang 4 , J. Z. Jiang 1
Affiliation  

Structural rejuvenation in metallic glasses (MGs) induced by cryogenic thermal cycling has been intensively studied. However, the effect of thermal cycling on the atomic dynamics in MGs is still missing. In this work, we present a systematic study on the atomic dynamics in a La-based MG affected by sub-Tg annealing and thermal cycling. We find that the thermal cycling has little effect on the atomic dynamics in both as-cast and annealed MGs although it could significantly increase the free volume and change mechanical properties of the as-cast MG sample. In contrast, both the structure and mechanical properties of the well-relaxed sample are almost unchanged by thermal cycling. The increased open volume, mainly in the form of atomic vacancies, does not greatly promote the atomic dynamics in the as-cast MG sample, indicating that the free volume induced by thermal cycling is not the key factor in stimulating the β-relaxation and the boson peak in the studied MG.

中文翻译:

低温热循环对具有不同初始状态的 La 基块状金属玻璃中原子动力学的贡献

已经深入研究了由低温热循环引起的金属玻璃 (MG) 的结构再生。然而,热循环对 MG 中原子动力学的影响仍然缺失。在这项工作中,我们对受亚 Tg 退火和热循环影响的 La 基 MG 中的原子动力学进行了系统研究。我们发现热循环对铸态和退火态 MG 的原子动力学几乎没有影响,尽管它可以显着增加自由体积并改变铸态 MG 样品的机械性能。相比之下,良好松弛的样品的结构和机械性能几乎不受热循环影响。增加的开放体积,主要以原子空位的形式,并没有极大地促进铸态 MG 样品中的原子动力学,
更新日期:2020-05-29
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