Quantitative assessment of physical aging on dynamical heterogeneity of amorphous alloys: Insight from stress relaxation
Year: 2025
Type: article
Abstract: Probing the dynamical and structural heterogeneity is a critical issue for understanding the mechanical and physical properties of amorphous alloys. Here, the stress relaxation of a (La0.6Ce0.4)65Al10Co25 amorphous alloy is investigated to probe the evolution of dynamical and structural heterogeneity due to aging. The characteristics of amorphous alloys are time-dependent during stress relaxation due to the metastability; thus, the aging effect should be considered by modifying the classical Kohlrausch–Williams–Watts (KWW) function. We find that the fixed-parameter KWW function during prolonged stress relaxation is not valid due to aging. Furthermore, the parameters of the modified KWW function indicate that physical aging leads to an increase in the characteristic time τ and decrease in the stretched exponent βKWW. The latter widens the instantaneous stress relaxation curve toward long-time end. The results demonstrated that the modified KWW function and the corresponding parameters conform to the conventional understanding of amorphous alloys.
Source: Journal of Applied Physics
DOI: 10.1063/5.0241494
Language: English
Subfield: Mechanical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $3,500
Funders: National Natural Science Foundation of China, Chinese Academy of Sciences, Generalitat de Catalunya, Youth Innovation Promotion Association of the Chinese Academy of Sciences, Agència de Gestió d'Ajuts Universitaris i de Recerca, Agencia Estatal de Investigación, Fundamental Research Funds for the Central Universities, Youth Innovation Promotion Association
OpenAlex ID: W4407189834