Growth and prediction of plastic strain in metallic glasses

TL;DR

This paper introduces a physically grounded, interpretable method to predict plastic deformation and failure in metallic glasses using early stress-strain data, improving understanding and practical prediction of material behavior.

Contribution

It presents a novel macroscopic approach based on plastic strain accumulation, utilizing Bayesian inference to predict yield and failure in metallic glasses from early data.

Findings

Identifies power-law and exponential regimes of plastic strain growth depending on annealing.

Enables early prediction of yield point within ~5% strain.

Correlates bulk plasticity with microscopic plastic activity.

Abstract

Predicting the failure and plasticity of solids remains a longstanding challenge, with broad implications for materials design and functional reliability. Disordered solids like metallic glasses can fail either abruptly or gradually without clear precursors, and the mechanical response depends strongly on composition, thermal history and deformation protocol -- impeding generalizable modeling. While deep learning methods offer predictive power, they often rely on numerous input parameters, hindering interpretability, methodology advancement and practical deployment. Here, we propose a macroscopic, physically grounded approach that uses plastic strain accumulation in the elastic regime to robustly predict deformation and yield. This method reduces complexity and improves interpretability, offering a practical alternative for disordered materials. For the Cu-Zr-(Al) metallic glasses prepared with varied annealing, we identify two limiting regimes of plastic strain growth: power-law in poorly annealed and exponential in well-annealed samples. A physics-informed framework with Bayesian inference extracts growth parameters from stress-strain data within $\sim$5\% strain, enabling early prediction of bulk response and yield point, well before the failure. The predictive performance improves with annealing, and bulk plasticity correlates with the microscopic plastic activity from scattered to growth near yielding. This work presents a physically interpretable and experimentally relevant framework for predicting plasticity and failure in metallic glasses from early mechanical response, offering both theoretical insights and practical tools for material characterization and design.