The lack of systematic data on how temperature affects the impact response of Ti-5Mo-5Al-5V-3Cr (Ti5553) components manufactured by laser powder bed fusion (LPBF) limits its broader use in aerospace structures exposed to extreme loading conditions. Therefore, dynamic compressive behavior of the LPBF-made Ti5553 is examined in this study across its service-temperature range conducted on a Split Hopkinson Pressure Bar (SHPB) at 298, 473, and 673 K. At 298 K, LPBF-made Ti5553 exhibits pronounced strain-rate hardening, with the maximum flow stress reaching ~ 1200 MPa at the highest attainable strain rate before failure (600 s⁻¹), while toughness increases more than fivefold relative to the lowest rate (69.7 MJ·m⁻³). As temperature increases, higher strain rates can be sustained; strength decreases, whereas ductility and toughness improve. At 473 K, the maximum flow stress decreases to ~ 1000 MPa at 1000 s⁻¹, accompanied by a notable rise in energy absorption (toughness ≈ 82 MJ·m⁻³). At 673 K, the alloy reaches its lowest strength of ~ 800 MPa at 1900 s⁻¹, yet toughness continues to increase, attaining ~ 116.5 MJ·m⁻³. Work-hardening rate (WHR) analysis further highlights the temperature dependence, showing reduced hardening magnitudes at elevated temperatures. Microstructural characterization using optical microscopy (OM), scanning electron microscopy (SEM), and electron backscatter diffraction (EBSD) reveals temperature-dependent deformation mechanisms. At 298 K, plastic deformation is primarily mediated by dislocation slip, grain fragmentation, and gradual ⟨110⟩ grain reorientation. On the other hand, at 473 K, dynamic recovery (DRV)becomes active, and shear localization emerges. Finally, at 673 K, deformation transitions toward partial discontinuous dynamic recrystallization (DDRX), grain flattening, and the formation of well-defined adiabatic shear bands (ASBs) containing fine recrystallized grains. • Elevated-temperature Split Hopkinson Pressure Bar tests of LPBF-made Ti-5553 were conducted (298–673 K) • Strength decreases while ductility and toughness increase with increasing temperature • Work-hardening rate exhibits pronounced temperature-dependent behaviour • Shear localization and adiabatic shear bands develop at elevated temperatures • EBSD reveals grain flattening and partial dynamic recrystallization at 673 K • Crystallographic texture rotates from 〈001〉 to 〈110〉 under dynamic thermal loading
Moradi et al. (Wed,) studied this question.