Reorientation-induced plasticity (RIP) in titanium alloys

This study used in-situ scanning electron microscopy to investigate the mechanisms of α′ reorientation-induced plasticity of Ti–4. 5Al–2. 5Fe alloy. The reorientation occurred directly or indirectly, with both pathways involving various α′ twinning events. The reorientation relationship among 12 α′ variants was analyzed based on β orientation, revealing four distinct β orientation regimes. Subsequently, the reorientation activity was assessed within these specified regimes. This activity depends on prior β orientation, directly determining the interaction energy and twin activity, especially 1¯011〈101¯2〉α′ twinning. The reorientation of α′ variants, which possess an orientation close to the 1¯011〈101¯2〉α′ twinning of α′ variants possessing the highest interaction energy, is essential for both reorientation activity and mechanical behavior. The derived results are closely aligned with experimental observations.