Work

Extraordinary enhancement of the toughness and plasticity of multilayered metallic glass composites with gradient heterogeneous interfaces

Year: 2025

Type: article

Abstract: A strategy is proposed to enhance the mechanical properties of metallic glasses using multilayered composites with various initial free-volume gradient interfaces and validated by finite element modelling. We found that the ductility of the composites improves significantly with the increasing number of layers. The main factors and the underlying mechanisms are (a) the gradient interface with varying free volume densities that can reduce the local stress concentration, (b) size effects imposed by the layer thickness that limits the local shear and shear bands to grow critically longer and thicker to cause catastrophic failure, (c) the presence of interface barriers to increase the probability of blocking and retarding the shear banding, and (d) the heterogeneity introduced by the statistical distribution of free volumes. The results demonstrate that the multilayered composites are promising in solving the strength-ductility tradeoff in metallic glasses.

Source: Philosophical Magazine Letters

DOI: 10.1080/09500839.2025.2544113

Authors: Yongwei Wang, Guangping Zheng, Mo Li

Institutions: University of Science and Technology Beijing, Hong Kong Polytechnic University, Georgia Institute of Technology

Language: English

Topic: Metallic Glasses and Amorphous Alloys

Subfield: Mechanical Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: diamond

Funders: Fundamental Research Funds for the Central Universities, Thousand Young Talents Program of China

Award: G6916651228