Abstract
The Charpy impact toughness of Ti–2.5Al–2Zr–1Fe alloy plate with a bimodal and normal grain size distribution was comparatively studied. The sample with the bimodal grain size structure exhibits the larger impact absorbed energy and lower anisotropy than that with the normal grain size structure, which is mainly attributed to the coordination of prismatic slips in the fine α grains and {101‾2}101‾1 deformation twins in the coarse α grains. The current work provides a promising approach for improving impact toughness and reducing anisotropy through microstructure optimization in near-alpha Ti alloys.
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