(3-relaxation anomaly with low modulus and enhanced recoverable strain in strain glasses crossover

CX Liang and D Wang and YC Ji and J Zhang and XB Ren and YZ Wang, ACTA MATERIALIA, 286, 120696 (2025).

DOI: 10.1016/j.actamat.2024.120696

The (3- relaxation phenomenon in glasses has shown important effects on toughness, ductility, and creep. However, such a (3- relaxation has not been reported yet in an important class of glassy materials, ferroic glasses. Here, we report the existence of a (3- relaxation anomaly and its physical origin in strain glass systems by combining molecular statics calculation and phase field simulation. The resolved (3- relaxation is observed below the strain glass transition temperature at a critical composition accompanied with spontaneous strain glass to normal martensitic phase transformation, and the internal friction for this (3- relaxation anomaly fits well with the Arrhenius equation. The superelasticity with (3- relaxation has shown low modulus with high recoverable strain over a wide temperature range. Calculated microstructural evolution and the local stress field caused by point defects suggest that the formed percolation-like metastable suppression field under cooling could be the physical origin of the (3- relaxation in strain glass systems and is correlated with crystallization.

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