Work

Structural origins of the mixed modifier effect on hardness in aluminosilicate glass

Year: 2025

Type: article

Abstract: Understanding the correlations among glass structure, composition, and mechanical properties, particularly hardness, is crucial for both academic research and practical applications. However, comprehending the underlying structural mechanisms dictating the hardness and plastic deformation of glasses remains a challenge. In this study, we divide hardness into two components: Young's modulus and the plastic‐to‐total indentation work ratio. Given the intriguing nonlinear convex trend in hardness while Young's modulus remains constant, a phenomenon known as the mixed modifier effect, our primary focus is the plastic‐to‐total indentation work ratio. By applying pure shear deformation within molecular dynamics simulations, the flow stress demonstrates a linear correlation with H v / and with the plastic‐to‐total indentation work ratio. Additionally, in our structural analysis, we identify that the average coordination numbers of network modifiers are key factors driving the nonlinear trend observed in both hardness and simulated flow stress.

Source: Journal of the American Ceramic Society

DOI: 10.1111/jace.20437

Authors: Hongyeun Kim, John C. Mauro

Institution: Pennsylvania State University

Language: English

Topic: Glass properties and applications

Subfield: Ceramics and Composites

Field: Materials Science

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $4,070

Funder: Office of Naval Research