金属玻璃蠕变及回复行为研究综述

Creep and Recovery Behavior of Metallic Glasses: A Short Review

摘要:

由于非晶合金独特的无序结构，其结构动力学特征涉及较大时间与尺寸跨度的粒子重排。作为深入研究金属玻璃体系弛豫行为与老化动力学的基础，对非晶合金结构动力学的表征和理解至关重要。大量研究表明，以镧基和铈基为代表的稀土基非晶合金的弛豫谱呈现明显次级弛豫过程，该体系亦成为探究非晶合金结构动力学与力学性能关联的理想载体。本文主要就金属玻璃的滞弹性变形作了详细评述。作为蠕变实验中变形的主要成分，这类变形在卸载后可完全回复，对其合理描述是深入理解非晶合金结构动力学的关键。此外，总结了蠕变和蠕变回复过程中滞弹性变形的主要特征，并介绍了几种可用于定量或定性分析的理论模型。

Abstract:

Due to the disordered structure of amorphous alloys, the complex structural dynamics involves the particle rearrangements with a large span in time and size scales. The characterization and mechanism of structural dynamics of amorphous alloys are crucial and fundamental for the further research of relaxation behavior and physical aging kinetics of glasses. Abundant researches show that the relaxation spectra of rare-earth-based amorphous alloys, which are represented by lanthanum- and cerium-based alloys, show obvious secondary relaxation process, and the system becomes an ideal carrier to investigate the relationship between structural dynamics and mechanical properties of amorphous alloys. In this review, the anelasticity of metallic glasses was discussed. The anelastic deformation, as the main component of deformation, can totally recovery after unloading in creep experiments, and its mechanism is important to form deep understanding about the structural dynamics of metallic glasses. Additionally, the main characteristics of anelastic deformation during creep and creep recovery were summarized, and some theoretical models for quantitative and qualitative description were introduced.