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Micromechanical insights into unconstrained grain boundary sliding
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DOI：10.1016/j.scriptamat.2026.117527.png)
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Abstract
En 中文
Grain boundary sliding is a key deformation mechanism at high homologous temperatures in polycrystalline materials, however, its intrinsic behavior is often obscured by strain accommodation processes. In this study, dislocation-mediated unconstrained GBS was investigated using Ni bicrystal micropillars containing a high-angle grain boundary. Micropillar compression tests were performed from room temperature to 600°C and strain rates between 5 × 10-4 and 10-1 s-1. By comparing bicrystal and single-crystal responses, intrinsic contribution of grain boundary sliding was isolated. The strain-rate sensitivity remained low (0.034 ± 0.017), comparable to room temperature values, indicating the absence of diffusion-controlled accommodation mechanisms. The activation energy for grain boundary sliding was determined to be
Keywords:
Grain boundary sliding
strain rate sensitivity
activation energy
micropillar compression
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5.6
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1.6W
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5.1W
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