Rejuvenation of La-based metallic glass by controlling different modes of relaxation

IF 5.3 2区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Yifan Yang, Jing Geng, Yunwei Cao, Li Fan, Bo Shi
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引用次数: 0

Abstract

Metallic glasses (MGs) have multiple dynamic relaxation modes, among which α and β relaxations are two typical modes. The rejuvenation of MGs usually refers to the increase in the total enthalpy of structural relaxation. However, the control mechanism of single-mode relaxation and the contributions of different relaxation modes to the total enthalpy are still unclear. We investigated the effects of stress, temperature and their coupling fields on α and β relaxations through experimental and molecular dynamics (MD) simulations. We found that the temperature field activated more sites for β relaxation, while the prolonged stress leads to the aggregations and connections of a quantity of localized atomic clusters and even activates α relaxation. The coupled field integrates the characteristics of stress and temperature fields and results in a clear splitting of α and β relaxations. Our work provides useful insights into the single-mode regulation of α and β relaxations in MGs.

Abstract Image

通过控制不同的弛豫模式使 La 基金属玻璃年轻化
金属玻璃(MGs)具有多种动态弛豫模式,其中α和β弛豫是两种典型模式。金属玻璃的年轻化通常是指结构弛豫总焓的增加。然而,单模弛豫的控制机制以及不同弛豫模式对总焓的贡献仍不清楚。我们通过实验和分子动力学(MD)模拟研究了应力、温度及其耦合场对α和β弛豫的影响。我们发现,温度场激活了更多的β弛豫位点,而长时间的应力则导致大量局部原子团簇的聚集和连接,甚至激活了α弛豫。耦合场综合了应力场和温度场的特征,并导致α弛豫和β弛豫的明显分裂。我们的研究工作为了解 MG 中 α 和 β 弛豫的单模调节提供了有用的见解。
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来源期刊
Scripta Materialia
Scripta Materialia 工程技术-材料科学:综合
CiteScore
11.40
自引率
5.00%
发文量
581
审稿时长
34 days
期刊介绍: Scripta Materialia is a LETTERS journal of Acta Materialia, providing a forum for the rapid publication of short communications on the relationship between the structure and the properties of inorganic materials. The emphasis is on originality rather than incremental research. Short reports on the development of materials with novel or substantially improved properties are also welcomed. Emphasis is on either the functional or mechanical behavior of metals, ceramics and semiconductors at all length scales.
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