Origins of microtexture and its impact on tensile anisotropy in a high-temperature titanium alloy forgings

The mechanical stability of titanium alloy forgings, particularly in large-scale components, is critically dependent on microstructural homogeneity and crystallographic orientation uniformity. This research presents a systematic examination of how temperature field distribution governs the microstructural evolution, crystallographic orientation, and resultant mechanical properties in Ti150 high-temperature titanium alloy forgings. Key findings indicate that the higher-temperature core regions consistently exhibit co-localized coarse prior β grains and microtextures, demonstrating strong intrinsic correlation. This co-occurrence stems from intensified formation of {001}β//CD fiber texture and proliferation of low-angle α_p/β phase boundaries under high-temperature deformation, which collectively amplify microstructural and orientational heterogeneity via enhanced variant selection and anti-pinning phenomena. Quasi-in-situ tensile testing further establishes that regional orientation gradients directly modulate slip system activation patterns, explaining the observed mechanical dichotomy where core regions exhibit higher yield strength but reduced elongation compared to peripheral zones. The study establishes a processing-microstructure-property paradigm that advances the scientific basis for forging process optimization in high-temperature titanium alloys.